Steam Powered Absorption Chiller Installation and Operation Manual TT
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Transcript of Steam Powered Absorption Chiller Installation and Operation Manual TT
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Thermal Technologies Europe AB | www.thermatec.se | [email protected]
Steam-fired LiBr Absorption ChillerInstallation & Operation Manual
V5.1
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Contents Part 1 Working Conditions ............................................................................................................................. 1 Part 2 Working Principle and Cooling cycle .................................................................................................. 2 Part 3 Main Parts and Their Functions ........................................................................................................... 4 Part 4 Properties of LiBr Solution .................................................................................................................. 6 Part 5 Control System and Protections........................................................................................................... 8 Part 6 Installation of system ......................................................................................................................... 13 Part 7 Preparation and Operation ................................................................................................................. 16 Part 8 Operation Record and Management .................................................................................................. 23 Part 9 Troubleshooting ................................................................................................................................. 27 Part 10 Maintenance .................................................................................................................................... 31 Appendix 1Saturated water vapor temperature & pressure table ............................................................ 37 Appendix 2System diagram .................................................................................................................... 38 Appendix 3Solubility curve of LiBr solution .......................................................................................... 39 Appendix 4Users water system linkage diagram ................................................................................... 40 Appendix 5Control cabinet I/O terminals ............................................................................................... 41 Appendix 6Electrical principle diagram ................................................................................................. 42
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Part 1 Working Conditions
Chilled water outlet temperature: 5
Cooling water inlet temperature: 1834
Chilled/Cooling water system pressure: 0.8MPa (except special orders)
Cooling water: Clean fresh water, with its quality complying with Table 8-1
Working steam: Saturated vapor with dryness fraction>99% and overheating
degree20C (except other vapors specified in the contract)
Power supply: 3 phase, 380V/50Hz
Machine room temperature: 5C40C
Machine room relative humidity: 85%
Machine room should be free of dust
Warning: 1. The chiller is a type of vacuum equipment and all valves on it have been
firmly sealed before shipment from factory. Any forms of modification to these valves are prohibited, that may damage or even destroy the chiller.
2. The chiller should be stored at a place where it is protected from rain and the relative humidity is not greater than 85%, otherwise the electrical elements may be damaged.
3. The chiller should be unpacked only by our companys professional commissioning personnel or properly trained individuals.
4. Do install a strainer (60-80 meshes) at the steam inlet. 5. Do install a check valve at the steam inlet. 6. The customers chilled water pump and cooling water pump are required to
be in linkage with the chiller, otherwise the freezing of tubes may occur.
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Part 2 Working Principle and Cooling cycle
1. Working principle
Any liquid absorbs heat from its surroundings as it vaporizes. And the lower the
atmospheric pressure, the lower the vaporizing temperature. For example, water vaporizes at
100 under one atmospheric pressure, but under the 0.00891 atmospheric pressure, it
vaporizes at 5.
That is the basic working principle of a LiBr absorption chiller. Water (the refrigerant)
vaporizes in the high-vacuum absorber and absorbs heat from the water to be chilled. The
refrigerant vapor is then absorbed by the LiBr solution (the absorbent) and circulated by pumps
to keep the process going cyclically.
Fig.2-1 Working principle
2. Cooling cycle
The working principle of a steam-fired double-effect LiBr absorption chiller is shown as
Figure 2-1. The diluted solution from the absorber, pumped by the solution pump, passes the
low-temperature heat exchanger (LTHE), condensed water heat exchanger (CWHE) and
6FF54F
F3
F2
1F
1
2
3
4
5
6
7
8
5 4
8
7
6 3
2
1Cooling water
out
Chilled water out
Cooling water in
Chilled water in
CondenserLow-temp generator
Steam in
High-temp generator
Evaporator Absorber
High-temp generator pressure
High-temp generator intermediate solution temp
Automatic decrystallizing tube temp
Evaporator liquid levelEvaporation temp
Automatic purge device liquid level
Cooling water inlet tempCooling water inlet target flowmeter
Chilled water inlet tempChilled water inlet target flowmeter
Chilled water outlet tempChilled water outlet target flowmeter
F1 Main purge valveF2 Ultimate vacuum purge valveF3 Absorber purge changeover valveF4 Refrigerant water sampling valveF5 Solution sampling valveF6 Refrigerant water regereration valve
Condensate out
Steam trap
Condensate heat exchanger
Low-temp heat exchanger
Auto
mati
c de
crys
talliz
ing t
ube
High-temp heat exchanger
Aut
omati
c pu
rge d
evice
Cooler
Vacuum pump Refrigerant pump
Solution pump
Oil trap
Concentrated solution
Intermediate solution
Diluted solution
Chilled water Cooling water
Refrigerant water
Refrigerant vapor
Steam
Condensate
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high-temperature heat exchanger (HTHE) and enters the high-temperature generator (HTG),
where it is boiled by the working steam flowing in the tubes to generate high-pressure,
high-temperature refrigerant vapor. The diluted solution turns into the intermediate solution.
The intermediate solution flows via HTHE into the low-temperature generator (LTG),
where it is heated by the refrigerant vapor from HTG to generate refrigerant vapor. The
intermediate solution becomes the concentrated solution.
The high-pressure, high-temperature refrigerant from HTG, after heating the intermediate
solution in LTG, condenses into refrigerant water. The refrigerant water then, together with the
refrigerant vapor from LTG, enters the condenser, where the mixture is cooled by the cooling
water and turns into refrigerant water.
The refrigerant water generated in the condenser passes through a U-pipe and enters the
evaporator. Part of the refrigerant water vaporizes due to the very low pressure in the
evaporator, while the majority of it is pumped by the refrigerant pump and sprayed on the
evaporator tube bundle. The refrigerant water sprayed on the tube bundle then absorbs the heat
from the water flowing in the tube bundle and vaporizes.
The concentrated solution from LTG flows via LTHE into the absorber and is sprayed on
the tube bundle. After being cooled by the water flowing in the tube bundle, the concentrated
solution absorbs the refrigerant vapor from the evaporator and becomes diluted solution. In this
way, the concentrated solution continuously absorbs the refrigerant vapor generated in the
evaporator, keeping the evaporation process continuing. In the meantime, the diluted solution is
transmitted by the solution pump to HTG, where it is boiled and concentrated again. Thus a
cooling cycle is completed and the cycle repeats.
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Part 3 Main Parts and Their Functions
The steam-fired double-effect LiBr absorption chiller mainly consists of the
high-temperature generator (HTG) (not available for single-effect models), low-temperature
generator (LTG), condenser, evaporator, absorber, high-temperature heat exchanger (HTHE)
(not available for single-effect models), low-temperature heat exchanger (LTHE), condensed
water heat exchanger (CWHE)automatic purge device, vacuum pump, solution pump,
refrigerant pump, electric valve, electric control cabinet, etc.
Table 3-1
S/N Part Name Function
1 HTG
Boils the solution with the working steam to generate the primary refrigerant
vapour which will enter LTG and concentrates the solution into the
intermediate solution which will flow to HTHE.
Working condition: absolute pressure700mmHg
solution temperature155C
2 LTG
Utilizes the primary refrigerant vapour to concentrate the intermediate
solution into concentrated solution. The primary refrigerant vapour changes
into refrigerant water and the secondary refrigerant vapour is created.
For a single-effect model, LTG evaporates the solution with the working
steam to generate the refrigerant vapour, and the solution becomes
concentrated solution.
Working condition: absolute pressure55mmHg
solution temperature90C
3 Condenser
Condenses the refrigerant vapour from LTG into refrigerant water and cools
down the primary refrigerant water from HTG, with the heat generated taken
away by the cooling water.
Working condition: absolute pressure55mmHg.
4 Evaporator Evaporates the refrigerant water to cool down the chilled water.
Working condition: absolute pressure7mmHg
5 Absorber Uses the concentrated solution to absorb the refrigerant vapour from the
evaporator, with the heat being taken away by the cooling water.
6 HTHE Recovers heat from the intermediated solution in HTG, improving the
thermodynamic coefficient of the chiller.
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7 LTHE Recovers heat from the concentrated solution in LTG, improving the
thermodynamic coefficient of the chiller.
8 CWHE Recovers heat from the condensate of the working steam in HTG, improving
the thermodynamic coefficient and lowering the steam consumption of the
chiller.
9 Automatic
purge device They constitute the purge system which removes the non-condensable gas in
the chiller, guaranteeing the performance and extending the service life of the
chiller. 10 Vacuum pump
11 Refrigerant
pump
Circulates the refrigerant water, making it dispersed evenly on the heat
transfer tube bundle in the evaporator.
12 Solution pump Circulates the solution.
13 Electric valve
set
Regulates the input of working steam or cuts off the working steam
14 Electric control
cabinet
Accommodates components of the control system.
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Part 4 Properties of LiBr Solution
1. General properties
Lithium bromide (LiBr) is similar to sodium chloride (NaCl) in property. As a stable
substance, it is nonperishable, non-decomposable and nonvolatile in the atmosphere. Its
solution is a clear, transparent, and nontoxic liquid, which has a bitter taste and can cause slight
itching on the skin. LiBr solution becomes slight yellow after lithium chromate (Li2CrO3) is
added in, and remains clear with lithium molybdate (Li2MoO4). Avoid touching it directly with
skin, splashing it into eyes and tasting it.
The quality of the LiBr solution decides the chiller performance to a large extent.
Therefore, strict measures must be taken to control its quality, which should meet the following
standards:
Concentration: 500.5%
Alkalinity: pH 9.0~10.5
Li2CrO3 content: 0.10.3% ( Li2MoO4 content: 0.012~0.018%) Maximum content of impurities:
ChlorideCl-: 0.05%
SulphateSO4-: 0.02% BromateBO4-: non-reaction
AmmoniaNH3: 0.0001%
BariumBa: 0.001% CalciumCa: 0.001%
MagnesiumMg: 0.001%
2. Solubility
The concentration of the saturated LiBr solution is about 60% at normal temperature. At a
given concentration, crystals separate out from the solution when the temperature drops. And at
a given temperature, crystals separate out when the concentration rises. Crystallization must
be avoided during the chillers operation and shutdown period. See Appendix 3 for the
solubility curve of LiBr solution.
3. Specific gravity
The specific gravity of LiBr solution is greater than that of water and is a function of the
concentration and temperature of the solution itself. So once the specific gravity and
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temperature of the solution is measured, the concentration can be obtained.
4. Causticity
Though LiBr solution has little caustic effect on common metals under vacuum condition,
it causes severe corrosion with presence of an extremely little amount of oxygen within the
chiller. Therefore, preventing air leaking into the chiller is the fundamental measures for
anti-corrosion. Adding proper amount of Li2CrO3(Li2MoO4) in the LiBr solution and keeping
pH value at 9.0~10.5 also effectively reduces its caustic effect on metals.
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Part 5 Control System and Protections
1. Components of control system
The control system of the chiller is composed of the PLC, touch screen, inverter,
temperature acquisition module, analog output module, liquid level controller, AC contactor,
thermal relay, intermediate relay, etc. Its peripheral input sensors include target flow switch,
liquid level electrode, platinum resistor, pressure switch, etc.
2. Functions of control system
S/N Function Description
1 Touch screen
operation
Easy and reliable touch operation compared to mechanical
contacts.
2 Human-machine
dialogue
Customers can change the parameter settings, correct the
measured values of parameters, learn how to operate and
maintain the chiller and have access to the memory through the
human-machine interface.
3 Clock display Time can be displayed on the screen, including the year, month,
date, hour, minute, second and weekday.
4 Auto start/stop The chiller can be automatically started or stopped at the
customer set time.
5 Information display Information about the chiller operating status, parameter setting,
correction, etc. is displayed in different pages on the screen.
6 Real-time test and display
Parameters such as temperature, flow and liquid level are
monitored and displayed in real-time mode.
7 Password protection
Three-level password protection system (power-on password,
parameter correction password and parameter setting password)
prevents unauthorized operations.
8 Auto load-adjusting
When the load varies, the steam input and circulating solution
amount are automatically controled, making the chiller operating
at the best status.
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9 Solution pump
inverter control
The solution pump is controlled by an inverter, ensuring
optimum circulating amount of the solution and optimum liquid
level in HTG.
10 Interlock control
system
The chilled water pump, cooling water pump and cooling tower
fan are automatically started or stopped according to the
operating condition, thus realizing automatic control throughout
the air conditioning system.
11 Fault protection and alarm
Once a fault occurs in the water system or the chiller itself, the
degree of the fault is automatically identified, an alarm is given
and corresponding protective measures are taken.
12 Self-diagnosis Faults are automatically diagnosed. Their location, cause and
remedy are suggested.
13 Fault record Information about faults, such as occurring time and type, is
stored automatically.
14 Remote control (extended function)
Control and monitoring of the chiller can be conducted from a
remote place and or via a DCS/PLC system.
15 Telephone networking (extended function)
Various data can be transmitted via the telephone network. Our
company can learn about the operation status of customers units
at any place by telephone, thus achieving active after-sale
service.
16 Building interface (extended function)
Reserved interface, used for linking with the building control
center.
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3. Operation sequence of the AI (artificial intelligence) system
Close air switch K1
Close air switch K2
Input power-on password
Function selection menu
Chiller function selection
Operation mode selection
Auxiliary function selection
Coo
ling
Aut
o ru
n
Man
ual r
un
Tim
ed o
pera
tion
Rem
ote
cont
rol
Con
trol p
aram
eter
cor
rect
ion
Con
trol p
aram
eter
setti
ng
Faul
t man
agem
ent
Syst
em fu
nctio
n
Ope
ratio
n re
cord
retri
eval
Auto run (cooling)
Cooling + auto run
Manual run (cooling)
Cooling + manual run
Timed operation (cooling)
Cooling + timed operation
Remote control (cooling)
Cooling + remote control
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4. Safety protection functions
Note: A single-effect absorption chiller doesnt have the long-time low liquid level fault in
HTG, high-pressure fault in HTG and false liquid level fault in HTG.
Power supply phase loss or phase reversed
Solution pump or inverter fault
Long-time low liquid level fault in HTG
High-pressure fault in HTG
Low-temp fault of chilled water
Stop of chilled water supply
Chilled water flow sensor fault
Stop of cooling water supply
Cooling water flow sensor fault
Refrigerant pump fault
False liquid level fault in HTG
High-temp fault in HTG
Evaporation low-temp fault
Cooling water high-temp fault
Cooling water low-temp fault
De-crystallizing tube high-temp fault
Chilled water inlet-outlet temp difference overlarge fault
Chilled water inlet temp sensor fault
Chilled water outlet temp sensor fault
Evaporating temp sensor fault
Cooling water temp sensor fault
HTG temp sensor fault
De-crystallizing tube temp sensor fault
Vacuum pump fault
Chiller stops, with alarm
If faults occur during auto/manual run, the chiller switches to dilution operation, with alarm
This function doesnt affect the control of the chiller.
If faults occur during auto run, the chiller switches to dilution operation. If faults occur during manual run, these functions dont affect the control of the chiller. In both cases, alarm is given
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5. Main parameter settings
AI system is an intelligent control system, which collects the real-time operating data about
the customer system and the chiller itself and adjusts the steam input and the circulating
amount of the solution based on the data. The default settings of the parameters listed below
may be reset by users as required.
Table 5-1
S/N Parameter name Default setting Setting range
1 Cooling water outlet temp 7C 620C
2 Temp difference between cooling water
inlet and outlet temp 5C 510C
3 HTG temp(cooling) 160C (98C for
singe-effect models)
145~160C (90~101C for
singe-effect models)
4 Pressure of pressure controller 0.02MPa Change prohibited
5 Inverter highest operating frequency 50Hz 40 50Hz (non-settable for
certain models)
6 Power-on password 1 09999
7 Parameter setting password **** 09999
8 Parameter correction password **** 09999
Parameter setting procedure
Input the power-on password and parameter setting password, enter the parameter
setting menu and set the parameter.
For safe operation purpose, parameters should be set by professional technicians!
6. Grounding requirement
To ensure safe and reliable operation of the chiller, the chiller is required to have a special
ground pole with the grounding resistance not greater than 10. The grounding terminals of the chillers electrical devices should be securely connected to this pole. Without a special
ground pole (or a neutral line), the chiller may be damaged and people be injured.
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Part 6 Installation of system
1. Machine room
Try to select a machine room which is close to the steam source and to where the
chilled water is used.
The machine room should have enough brightness and good ventilation with the relative humidity less than 85%. In case the chiller is installed outside the room, the
electrical devices and measuring instruments should be protected from moisture, rain,
sunshine, etc.
Sufficient space should be reserved around the chiller for maintenance: 1m in the
lengthwise direction, 0.2m above the chiller, 1.2m on the control cabinet side and
0.5m on other sides. And on either end of the chiller, a tube-drawing apace, not less
than the distance between the two tube sheets, should be kept so that the heat transfer
tubes can be drawn out.
The machine room should be equipped with necessary devices like electric outlets and water taps. And there should be drains around the chiller.
2. Placement of chiller
Since the LiBr absorption chiller runs stably
with slight vibration, its foundation may be
designed according to its static load (i.e. operating
weight)
After putting the chiller in place, calibrate the
chiller horizontally with the help of the 4 basic
holes in the two tube sheets. The error of the level
degree should not be greater than 0.002. The level
degree can be regulated through the cushion block
located between the foundation and the support of
the chiller and can be measured with a gradient or a
transparent plastic connecting pipe.
Basic holes
Wat
er-f
illed
pla
stic
pip
e
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3. Piping
Flexible connectors and manometers should be mounted at the inlets/outlets of the chilled
water and cooling water. If the dryness of the working steam is less than 0.90, a steam-water
separator should be mounted. At the inlets of chilled and cooling water there should be
strainers with 3-6mm meshes, or the cooling capacity may decrease and frozen tubes may
occur. And at the inlet of the working steam, there should be a strainer with 60-80 meshes,
otherwise failure in the electric valve may occur.
The steam piping is suggested as below:
In certain cases the steam supply cannot be cut off suddenly, for it may affect the
production process or the system. In such cases, replace the motorized two-way valve with a
three-way valve (as shown below).
4. Steam condensate piping
The pressure of the steam condensate usually stands at 0.05MPa. If the condensate cannot
return to the boiler room by itself, install a condensate tank at the condensate exit and then
Steam
Steam piping diagram(for reference)
Strainer(80-100 meshes)
Strainer(80-100 meshes)
Cut-off valve
Cut-off valve
Cut-off valve
Pressure reducing
valve
Electric valve
Pipe reducer
HTG end enclosure
Steam
Cut-off valve
Cut-off valve
Cut-off valve
Strainer(80-100 meshes)
Strainer(80-100 meshes)
Pressure reducing
valveElectric valve
Pipe reducer
HTG end enclosure
to cooling equipment when the chiller stops
3-way steam valve piping diagram(for reference)
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pump the condensate to the boiler room. The condensate tank should be lower than lowest
place of HTG. The weight of all external pipes connected to the chiller must be carried by
the chiller!
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Part 7 Preparation and Operation
1. Preparation for initial start
Preparation of instruments and tools: Hand tools
Absolute pressure gauge
Digital multi-meter Liquid-charging flexible pipe: diameter 1 inch25mmlength 6m.
Densi-meter and mercury thermometer
Check of jobsite piping Check the chilled/cooling water pipes according to the Piping system diagram
Check if the inlets/outlets of the water system, water pumps and cooling tower are
misconnected;
Check if there is a discharge valve on each pipeline;
Check if there is leakage at flanged connections;
Make sure the chilled/cooling water flow rate meets the operation requirement and check the pressure borne by the chiller water system;
A hand-operated cut-off valve and pressure reducing valve should be installed on the
steam pipe;
Check if a drain valve has been installed at the lowest site of both the steam pipe and
the steam condensate pipe.
Check of purge system Check if the vacuum pump oil brand number is correct;
Check if the vacuum pump oil has been emulsified and the oil level is in the middle of
the sight glass;
Check the ultimate vacuum of the vacuum pump: close the main purge valve F1, start
the vacuum pump and pump the oil trap only. Connect a McLeod vacuum gauge to the
ultimate vacuum purge valve F2, start the vacuum pump and let it run for 3-5 minutes.
If the reading on the McLeod vacuum gauge is consistent with the ultimate vacuum of
the pump, that indicates the vacuum pump is excellent in performance.
Check of wiring All system equipment is required to be checked.
Check if the wiring complies with the Wiring diagram and meets the requirement.
Check if the power supply for the cooling tower fan/chilled water pump/cooling water pump is correctly connected.
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Check if the voltage and frequency of the power supply match the motor nameplate parameters and meet the requirements of the control system.
Check the permitted overload capacity and fuse size of each motor.
Check if all electrical devices have been earthed as required. During operation, check if all motors lubrication, power supply and rotation direction
are normal.
Do not start the solution pump or refrigerant pump before the LiBr solution is fully
charged into the chiller. Otherwise, the pump will be seriously damaged. Charging of LiBr solution
The LiBr solution is generally a 50% mixed solution, in which 0.2% lithium chromate (or
0.015% lithium molybdate) has been added as a corrosion inhibitor. The pH value of the
solution has been adjusted within the range of 9~10.5. It is recommended to recheck the
solution and take a sample and reserve the sample prior to the charging.
Charging principle The solution is sucked into the absorber by the high vacuum in the chiller sucks via the
sampling valve (F5) located at the solution pump outlet.
Attention points a) Do not start the solution pump while charging the solution.
b) Do not charge the solution directly from a small container into the chiller. That may
bring air into the chiller.
c) When the charging begins, start the vacuum pump to
remove non-condensable gases out of the chiller.
Charging method Prepare a solution container (made of corrosion
resistant material), pour the solution in it(if solution is turbid
or dirty, filter it first), and connect as the figure on the right.
Fill the flexible pipe with solution to keep air out. Connect
one end of the pipe with the sampling valve, and dip the other end in the container. Notice:
keep the flexible pipe filled with water to prevent air entering; and the end dipped in the
container should be at least 30mm away from the bottom of the container lest the deposits and
impurities flow into the chiller with the solution.
Charging amount Refer to the nominal parameter table for the charging amount of the solution. Whether
Flexible pipe
Solution container
Sampling valve
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the amount is appropriate can be judged by observing if it meets the circulating requirement of
the chiller under the standard operation condition.
2. Operation of the chiller
Manual run screen
Manual run procedure
a) Start the chilled water pump and open its discharge valve, and regulate the flow rate to
the rated valve;
b) Start the cooling water pump and open its discharge valve, and regulate the flow rate to
the rated value;
c) Open the hand-operated steam valve and condensate drain valve, drain the condensate
water in the steam supply pipe, and regulated the steam pressure to the rated value.
d) Turn on the power switch in the control cabinet. The start-up menu is displayed on the
touch screen. Press Power-on password key, input the pre-set power-on password,
press Confirmation and then enter the Manual run menu following the prompts on
the screen;
e) Press Chilled water pump, Cooling water pump, Solution pump and Refrigerant
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pump keys(highlighted after pressed) in sequence. Start the electric valve slowly. The
chiller enters normal operation. When the screen indicates that the cooling water inlet
temperature is equal to or greater than 30, start the cooling tower.
f) Stop procedure: Close all valves first. The chiller starts the dilution operation. Wait until
the temperature of the solution at the HTG exit drops below 80, stop the Solution
pump, Refrigerant pump, Cooling water pump and Chilled water pump in
sequence. Press Back key in the upper right corner of the screen returning to the
start-up menu, then switch off the control power supply.
Function of other touch keys
Vacuum pumpUsed to start the vacuum pump
Alarm silenceUsed to eliminate the fault warning sound temporarily
Solution pump frequencyUsed to display the frequency of the current voltage
HTG levelUsed to display the HTG liquid level, which can be regulated by changing
the frequency of the inverter
Right part of screen: Used to display main operating parameters
Manual run of the chiller is only for commissioning and must be performed by
professional personnel!
To prevent the heat transfer tubes in the evaporator from being frozen due to stop of
cooling water flow, observe the following items:
Confirm that the target flow switch works normally before starting the chiller.
When starting the chiller, start the chilled water pump (and confirm it has run)
first and then the cooling water pump.
After dilution and shutdown, stop the cooling water pump first and then the
chilled water pump.
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Auto run screen
Auto run procedure
a) Enter the function selection menu and select Auto run.
b) Press the Auto start key. The chilled water pump, cooling water pump, solution pump,
electric valve and refrigerant pump are started in sequence. If any fault occurs, the
chiller begins dilution operation and gives an alarm and the screen automatically
switches to the fault management menu, which provides information about the fault and
its treatment.
c) Stop procedure: Press the Auto stop key and the chiller begins the dilution operation.
Once the HTG temperature drops to the pre-set value, the chiller stops automatically.
Then stop the cooling water pump, and two minutes later stop the chilled water pump
and turn off the power supply to the chillerwhen the chilled water pump and cooling
water pump are not interlocked with the chiller.
Note: Solution pump, Refrigerant pump, Electric valve, Chilled water pump, Cooling
water pump, and Cooling tower are used only for display. They cannot be operated.
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The frequency of the solution pump has been set in the factory, no people other than
professional technicians is permitted to modify it!
Close the steam cut-off valve first after the chiller is stopped (whether automatically
or manually), otherwise hazardous faults such as crystallization in HTG or high pressure
may occur.
5. Purging
In cooling cycle
In cooling operation, purge valves 1 and 2 are closed.
When the liquid level in the gas tank falls below the
sight glass or the control cabinet operation panel requires,
the vacuum pump should be started for purging. Purging
steps are:
1) Start the vacuum pump and keep it running for about half a minute;
2) Open valve 1 and pump for at least three minutes;
3) Open valve 2 and keep pumping until the cooling effect recovers;
4) Close valve 1 first and then valve 2;
5) Let the vacuum pump run for another half an hour, and then stop it.
Attention: If valve 2 is not closed, non-condensable gases in the gas tank will return to the inside of the chiller through it.
In shutdown period During a long period of shutdown, the purging should be performed once every month,
each time for about one hour. The method is: start the vacuum pump and open valves 1 and 2.
After purging, close valve 1 first and then stop the vacuum pump and close valve 2, otherwise
the vacuum pump oil will be pumped into the chiller and degrade the cooling performance
greatly.
The chiller must be kept highly airtight and the air in it must be pumped out timely,
1
2
Purge valve 1
Purge valve 2
Sight glass
Vacuum pump
Gas
takn
Solu
tion
in
Oil trap
Ejector
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otherwise the life of the chiller will be shortened and the energy consumption increased dramatically!
Replacement of diaphragms
1) The diaphragms of valves 1 and 2 must be replaced every 3 years.
2) Other valve diaphragms must be replaced every 5 years.
Maintenance of the vacuum pump
1) If a water layer emerges at the bottom of the vacuum pump oil, drain it out slowly. During the pumping of the vacuum pump, the gas ballast valve on it should be left
open so that the water vapor can be removed out of the pump.
2) If the vacuum pump oil is emulsified and turns white, replace it.
Secondary seal for the vacuum valve
Sealing rings wear out due to the rotation of the valve shaft, which in turn will cause gas
leakage; therefore, great attention should be paid to the secondary seal.
1) Remove the oil stains, scrap iron and sealant residues on the valve cap screw thread,
valve body screw thread and O-rings with a steel brush;
2) Spray Letai detergent on them, brush again and dry them;
3) Spread a layer of Letai 567 sealant for pipe thread;
4) Tighten the valve cap with a spanner to secure the seal.
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Part 8 Operation Record and Management 1. Operation record form
The operation record is an important document to track the operation status of the chiller.
It is usually recorded at an interval of 1 to 2 hours, which may be longer or shorter as
required.
Operation Record Form for Steam-fired Chillers Model or S/N Date Recorder
Recording items Time
Unit
Evaporator Chilled water
inlet temp
Chilled water
outlet temp
Evaporation
temp
Chilled water
inlet pressure
MPa
Chilled water
outlet pressure
MPa
Chilled water
flowrate
m3/h
HTG Steam
consumption
Kg/h
Steam temp
Steam pressure kPa
Solution temp at
HTG outlet
Condensate
discharge temp
HTHE Intermediate
solution outlet
temp
Diluted solution
outlet temp
LTHE Diluted solution
inlet temp
Concentrated
solution inlet
temp
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Concentrated
solution outlet
temp
Absorber Cooling water
inlet temp
Cooling water
outlet temp
Cooling water
inlet pressure
MPa
Cooling water
flowrate
m3/h
Condenser Cooling water
outlet temp
Cooling water
outlet pressure
MPa
Note
2. Operation management
Management of solution In the initial stage of the operation of the chiller, the content of lithium chromate (or
lithium molybdate) in the solution would decrease due to the generation of the protective film.
And if there is rust or air in the chiller, even an extremely little amount, will lead to chemical
reactions, which in turn will raise the pH value of the solution and even accelerate corrosion of
the chiller. Therefore, the solution should be sampled to check the content of lithium chromate
(or lithium molybdate), iron ion, copper ion, chlorine ion, etc. as well as the pH value of the
solution after the chiller has run for a period of time.
If the content of lithium chromate (or lithium molybdate) drops below 0.1% (or 0.012%),
add some more in time. And the pH value should be kept between 9.0 and 10.5. If its too high,
adjust it with hydro bromic acid (HBr); if its too low, adjust it with lithium hydroxide ( LiOH).
Management of refrigerant water If the specific weight of the refrigerant water is greater than 1.0 during the running of the
chiler, which means the refrigerant water contains lithium bromide. This is also called
Polluted refrigerant water, which will lower the cooling capacity. The refrigerant water is
usually regarded normal when its specific weight is less than 1.02, otherwise it must be
regenerated and the cause of the pollution be analyzed to prevent its recurrence.
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Regeneration of the refrigerant water is as follows:
1) Start the refrigerant pump and open the regeneration valve F3, pumping the
refrigerant water in the evaporator into the absorber via a by-pass.
2) Close F3 and stop the refrigerant pump; 3) When the solution has been concentrated and the refrigerant water has condensed on
the evaporator to a certain amount, restart the refrigerant pump.
Replenishment of octanol
Octanol is insoluble in the solution. After the chiller has run for some time, part of octanol
will float on the surface of the refrigerant water and the solution. And since octanol is a volatile
substance, the running of the vacuum pump will bring some octanol out of the chiller, thus
reducing its circulating amount and affecting the chillers performance. Therefore, octanol
should be replenished as required.
The method for charging octanol is similar to that for the solution. Remember to start the
vacuum pump after the charging to remove the air that might leak into the chiller during the
charging.
Management of water quality
The performance and life span of the chiller depend largely upon the quality of the cooling
water. Water of poor quality is easy to scale on the wall of heat transfer tubes, reducing the
cooling capacity.
The water used in the LiBr absorption chiller should comply with the requirements shown
in Table 8-1. If the water is too hard, soften it before using it.
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Table 8-1 Water quality standard
Item Unit
Quality of cooling water Quality
standard for
recharged
water
Standard
value
Tendency
Corrosion Scaling
PH25 6.58.0 + + 6.58.0
Conductivity(25 microhm/cm
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Part 9 Troubleshooting 1. Crystallization
During cooling cycle, when crystallization occurs in the concentrated solution in LTHE or
pipes, the temperature of the automatic de-crystallizing tube will rise and an alarm will be
given, while the temperature of the concentrated solution pipe leading to the absorber fall
dramatically.
Remedy Stop the cooling water pump and chilled water pump, and close the steam cut-off
valve to 40%. Now the high-temperature concentrated solution coming out of LTG
flows directly into the absorber via the de-crystallizing tube and heats the diluted
solution in the absorber. The heated diluted solution then enters LTHE, heats the
concentrated solution there and melts the crystals.
For crystals in pipes, melt them by heating them directly with steam, high-temperature water or flames.
2. Refrigerant water pollution In cooling operation, the phenomenon of LiBr solution mixing into the refrigerant water is
referred to as refrigerant water pollution.
Severe pollution will result in a great drop in chiller performance or even operation failure.
The refrigerant water should be regenerated if its density exceeds 1.02.
Regenerating method
With the refrigerant pump running, open the refrigerant water by-pass valve, diverting the polluted refrigerant water in the evaporator to the absorber.
Causes of refrigerant water pollution
Circulating solution amount is too large and the liquid level in the generator is too high.
At the beginning of the chiller operation, the pressure of the solution vapor rises too
fast, causing the solution in the generator to boil too violently and enter the
condenser.
The cooling water temperature is too low.
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3. Common faults and remedies (see Table 9-1)
Table 9-1
S/N Faults Possible causes Remedies
1 Chiller cant be started
aNo power is connected to the control cabinet
bFuse in the control cabinet blows
aCheck the main power supply and control switch
bCheck the grounding wiring or short circuits, and replace the fuse
2
Cooling capacity lower than the set point
a Poor sealing causes air leakage into the chiller
b Refrigerant water is polluted
c Circulating amount of the diluted solution is too small
d Vacuum pump is poor in pumping performance
e Spraying device is blocked f Scaling or clogging of heat
transfer tubes g Cooling water temp is too
high h Cooling water flow rate is
too small i Vapor pressure is too low
a Start the vacuum pump to pump air out and eliminate the leakage
b Examine the density of refrigerant water. If it is over 1.02, regenerate it
c Increase the frequency of the inverter
d Test the vacuum pumps performance and repair the fault
e Clean or replace spraying device f Eliminate scales and impurities on
the inside wall of heat transfer tubes g Regulate the cooling tower and
check the cooling water system h Raise the cooling water flow rate i Increase the vapor pressure
3 Chilled water outlet temp is too high
a External load is greater than the chillers cooling capacity
b Cooling water flow rate is too small or its temp is too high
c Set point of the chilled water is too high
d The amount of octanol decreases
e There are non-condensable gases in the chiller
a Decrease external load b Increase the cooling water flow rate
or decrease its temp c Reset the set point of the chilled
water temp d Add octanol e Start the vacuum pump to pump out
non-condensable gases
4 Refrigerant water is polluted
a Circulating amount of the solution sent to HTG is too large and liquid level in HTG is too high
b Cooling water temp is too low and cooling water amount is too large
a Regulate the frequency of the inverter
b Decrease the amount of the cooling water
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5 Crystallization in LTHE
a Cooling water temp is too low
b Circulating amount of the solution sent to HTG is too small
a Increase the cooling water temp and decrease its flow rate moderately
b Increase the circulating amount of the solution which is sent to HTG
6 Crystallization of solution after shutdown
a Dilution time is too short b Chillers ambient temp is
too low
a Increase the dilution time, guaranteeing full mixture of the solution
b Add refrigerant water to dilute the solution, preventing it from crystalizing
7 Cavitation erosion in solution pump
a Insufficient solution amount
b Crystallization of solution
a Add solution b Melt crystals
8 Purge system runs abnormally
Incorrect operation of purge valves
Check if the valves are correctly opened or closed, or tightened.
9 Vacuum degree drops Leakage
Check to see if valves or instruments connected directly to atmosphere are loose, or valve diaphragms become aged
4. Treatment for action of safety devices
During operating, the chiller will stop automatically and give an alarm if any failure
occurs and the safety protection level has been reached. Remedies for the action of safety
devices are listed in Table 9-2 below.
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Table 9-2 Remedies for action of safety devices
S/N Location of action Remedies
1 Cooling/chilled water flow switch operates
a Check to see if the operation of water pumps is normal. b Check to see if pressure is normal and if air enters water system.
Discharge air if air enters water system. c Check to see if valves are open and open them wider. d Check to see if filters are clogged.
2 Cooling/refrigerant water temp over load alarm
a Check to see if external load is lower than the cooling capacity adjusting range.
b Check to see if cooling water temperature is too low.
3 HTG pressure switch operates
a Check the airtightness of the chiller, seeing if the purge system operates normally, and if there is any leakage.
b Check to see if vapor pressure is too high. c Check to see if the cooling water flow rate is too small. d Check to see if scaling occurs in the absorber/condenser heat
transfer tubes.
4 HTG low liquid level alarm
a Check to see if the level control electrode is sensitive. b Check to see if the solution pump runs normally. c Check to see if the liquid level is normal.
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Part 10 Maintenance 1. Maintenance during short-term shutdown
During short-term shutdown(less than two weeks), the chiller should be maintained as
follows:
Keep a high vacuum degree in the chiller. If air enters the chiller, pump it out timely.
Track the temperature change to prevent crystallization.
During dilution before shutdown, transfer all refrigerant water in the evaporator to the absorber via the by-pass valve, ensuring full dilution of the solution.
When doing repairs during shutdown period, such as replacing the canned pump or
valves, avoid exposing the inside of the chiller to the atmosphere for a long time. So
conduct the repair quickly, otherwise the chiller may be eroded.
2. Maintenance during long-term shutdown Great attention should be paid to the long-term shutdown maintenance in order to ensure
the chillers high performance and long life. The maintenance work includes:
Preventing air leaking into the chiller and causing corrosion Vacuum method: Start the vacuum pump regularly (every 15-30 days) to pump out
air which has leaked into the chiller.
Nitrogen method: Charge high-purity nitrogen gas (99.999%) into the chiller until the pressure reaches 0.02MPa. Before charging, purge the valve and rubber
tube with the nitrogen gas to prevent air entering the chiller.
For both methods, the diaphragm valves should be sealed lest it should be opened by accident!
Preventing crystallization
During the dilution operation prior to shutdown, transfer all refrigerant water in the evaporator to the absorber via the by-pass valve, allowing solution coming
from different parts of the chiller to mix fully and preventing crystallization.
Cleaning heat transfer tubes and water system Open the water chambers of the absorber, condenser and evaporator, check heat
transfer tubes, and remove residues in water chambers and heat transfer tubes.
If there is scale in the tubes, chemical methods may be used to remove it. The 81-A acidic cleaning agent produced by Shanghai No.2 Reagent Factory is
recommended. The cleaning process is as follows: make the cleaning agent into a
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5-10% solution, heat it to 50-60 and circulate it through the transfer tubes. It
normally takes about 18 hours to eliminate 1mm-thick scale. After the cleaning,
drain the cleaning agent, charge 0.5-1% solution of trisodium phosphate (Na3PO4)
or sodium carbonate (Na2CO3) into the tubes and circulate it to neutralize the
acidic solution left in the tubes.
Preventing oxygen corrosion and icing
After cleaning up heat transfer tubes and water system,
If icing is impossible, the water system should be fully charged with water to
prevent oxygen corrosion in water chambers of the absorber, condenser and
evaporator.
If icing is possible, drain heat transfer tubes and water system and dry them to
avoid frozen tubes and reduces oxygen corrosion.
Check and replace failed parts Such as the graphite bearing of the canned pump, valve sealing rings,
diaphragms of diaphragm valves, auto-control components and spring for the
rotary vanes of the vacuum pump.
While replacing the parts of the vacuum system, avoid exposing the inside of the
chiller to the atmosphere for a long time.
All electrical equipment and instruments should be protected against moisture.
3. Treatment of LiBr solution
If LiBr solution becomes turbid and turns dark red, black or green, it must be treated.
There are two methods to treat the solution
Deposition method: put the LiBr solution in a large container, after a certain period
of time, the deposits will settle on the bottom of the container and the solution will
become clear again. Extract the upper clean solution and reuse it.
Filtering method: use a strainer made of propylene, with its meshes being 3mm in
diameter, to filter the solution. While filtering solution containing deposits, it is
recommended to filter it after it has been deposited for 1 or 2 days. Do not use a
strainer made of cotton fiber.
Then measure the content of lithium chromate (or lithium molybdate) and pH value, and
adjust them to the specified values.
4Regular check The chiller should be checked periodically, during both operation period and shutdown
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period, to maintain its good performance and safety running. The check items are listed in the
following table.
Table 10-1 Regular check items
Items Check points Check cycle
daily weekly monthly yearly
Vacuum pump a) Pollution and emulsification of oil b) Performance of vacuum pump c) Insulation of motor
Solution pump & refrigerant
pump
a) Operating status of the chiller. Check to see If there is any unusual noise
b) If power supply to motor exceeds the normal value
c) Insulation of motor d) Dismantlement and check of vanes; cleaning
of return pipes
Every about 5 years
e) Replacement of graphite bearing Every 5 years
LiBr solution
a) Concentration b) Cleanness degree c) pH value and lithium chromate(or lithium
molybdate) concentration
Refrigerant water
Check its pollution condition and decide whether to regenerate it
Heat transfer tubes
a) Corrosion of inner wall b) Scaling on inner wall
Sealing of chiller
a) Change of temperature difference between diluted solution and cooling water; change of cooling effect
b) Record of pressure changes during shutdown period
Diaphragm valves and
solution adjusting valves
a) Sealing condition b) Replacement of diaphragms of valves 1 and 2 Every 3
years c) Replacement of diaphragms of other
diaphragm valves Every 5
years
d) Replacement of the O-ring of the changeover valve
Every 5 years
Pressure gauge and control
cabinet
a) Calibration of indication b) Insulation of electrical devices c) Reliability of switches for electrical devices
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Operation Rules
(Double-effect steam-fired LiBr absorption chiller)
1. Machine room management rule (1) The operators must observe this rule to ensure safe running of the chiller.
(2) There should be strict management regulation and shift regulation for the machine room.
(3) There should be personnel on duty in the machine room during running of the chiller.
(4) No one other than qualified persons is allowed to operate the chiller alone.
(5) No one other than the operators is allowed to enter the machine room without permission.
(6) No one other than machine room staff is allowed to open or close any valve or other
components of the chiller, otherwise accident may occur.
(7) The machine room should have excellent ventilation and the relative humidity in it should
be controlled below 75%.
(8) The power supply in the machine room should be normal with stable voltage.
(9) The machine room should have sufficient high-purity (99.999%) nitrogen gas and
common tools, materials and spare parts which are necessary for the maintenance of the
chiller and system.
2. Safe operation rule (1) It is prohibited to change safety protection parameters. For example, the set point of the
HTG temperature (cooling) is 160.
(2) It is prohibited to adjust safety devices. For example, the set point of the pressure
controller is 0.02MPa.
(3) It is prohibited to start the chiller if there is any abnormality with safety protection
functions.
(4) It is prohibited to start the chiller if there is any abnormality with the target flow regulator
for chilled water.
(5) It is prohibited to start the chiller if there is any leakage.
(6) It is prohibited to start the cooling water pump first and then start the chilled water pump.
(7) It is prohibited to stop the chilled water pump first and then stop the cooling water pump.
When the cooling water temperature is low (25), the chilled water pump must be
stopped two to five minutes after the cooling water pump has been stopped.
(8) It is prohibited to start the chiller if the chiller is obviously vibrated by the piping system.
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3. Chiller operation rule Check the following items each time before starting the chiller
(1) Confirm that the valves at the chilled/cooling water inlet/outlet are open.
(2) Confirm that the safety protection parameters are properly set and select Auto
operation mode on the touch screen.
(3) Safety devices should work normally, particularly when the flow rate of chilled or
cooling water is lower than the specified value, an alarm can be given, the working
steam be cut off, and the chiller be stopped automatically.
Start sequence
(1) Start the chilled water pump first, observe its inlet-outlet pressure difference, and
confirm that the water flow rate meets the operation requirement.
(2) Start the cooling water pump.
(3) Open the by-pass valve for the vapor condensate, and close it after the condensate
water in the pipe has been drain. Then open the vapor cut-off valve.
(4) Press the Auto key.
(5) Start the cooling tower fan when the cooling water inlet temperature reaches 30 (if
the system adopts interlock control, the cooling tower fan will start automatically).
Stop sequence
(1) Press the Stop key and manually close the vapor cut-off valve.
(2) Switch off the power after the automatic dilution process ends.
(3) Stop the cooling tower fan and cooling water pump.
(4) Finally, stop the chilled water pump.
Operation monitoring
(1) Make detailed operation records which are used for the analysis of the chiller
operation condition.
(2) Monitor the liquid level in HTG and the temperature and pressure of the solution in
HTG. The liquid level mustnt be too low, and the temperature and pressure mustnt
be too high, otherwise the heat transfer tubes will be damaged.
(3) Monitor the running of the canned pump. If its shell temperature exceeds 80, stop it
immediately and troubleshoot the problem.
(4) Check to see if the working steam pressure is within the specified range.
(4) Shut off the working steam immediately in any of the following circumstances:
Loss of chilled water flow or failure in the canned pump
Serious air leakage Liquid level rises unexpectedly or disappears
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Accidental power failure
4. Emergency treatment rule
When any significant fault occurs during the running of the chiller, the machine room staff
must take corresponding measures as soon as possible.
Copper tubes are frozen or damaged
Symptom: Liquid level at various locations rises too greatly and the cooling effect
disappears.
Remedy:
1) Stop the chilled water pump and close the valves at the chilled water inlet and outlet at once.
2) Turn off the main switch in the control cabinet and stop the cooling water pump.
3) Drain the water from the water chamber. 4) Charge nitrogen gas into the chiller until the pressure reaches 0.02MPa.
Discharge the solution into the solution tank for regeneration.
Sudden power-off during operation 1) Close the vapor cut-off valve at once.
2) Resume power supply and start the chiller as soon as possible lest the
concentrated solution should crystallize.
5. Maintenance rule
Maintenance should be performed strictly in accordance with the Operation Instruction.
Maintenance should be performed by or under the direction of qualified personnel.
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Appendix 1Saturated water vapor temperature & pressure table
Temperature Pressure Temperature Pressure
kgf/cm2 mmHg kgf/cm2 mmHg
1 0.006697 4.93 66 0.2666 196.2
2 0.007194 5.29 68 0.2912 214.3
4 0.008289 6.10 70 0.3178 233.8
6 0.009530 7.01 72 0.3463 254.7
8 0.01932 8.04 74 0.3769 277.3
10 0.0125 9.2 76 0.4098 301.5
12 0.014292 10.5 78 0.4451 327.4
14 0.01629 12 80 0.4829 355.3
16 0.018529 13.6 82 0.5234 385
18 0.021034 15.5 84 0.5667 416.9
20 0.02383 17.5 86 0.6129 450.9
22 0.026948 19.8 88 0.6623 487.2
24 0.030415 22.4 90 0.7149 525.9
26 0.034266 25.2 92 0.7425 546.2
28 0.038536 28.3 94 0.8306 611
30 0.043261 31.8 96 0.8941 657.7
32 0.04848 35.7 98 0.9616 707.3
34 0.05424 39.9 100 1.033 760
36 0.06058 44.6 102 1.087 799
38 0.06756 49.7 104 1.166 858.7
40 0.07522 55.3 106 1.250 919.6
42 0.08362 61.5 108 1.339 985.1
44 0.09281 68.3 110 1.432 1053
46 0.1028 75.7 112 1.531 1126
48 0.1138 83.7 114 1.636 1026
50 0.1258 92.5 116 1.746 1284
52 0.1388 102.1 118 1.862 1370
54 0.1530 112.5 120 1.98 1456
56 0.1683 123.9 125 2.366 1740
58 0.1850 136.1 130 2.754 2026
60 0.2031 149.4 135 3.192 2348
62 0.2227 163.8 140 3.684 2710
64 0.2438 179.4 145 4.236 3116
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Appendix 2System diagram
Chilled water system Cooling water system Steam system
LoadExpansion water tank
Cooling tower
Pressure reducing valve
Working steam in
Condensate out
Check valve Steam trap Electric valveCut-off valve
Filter Flexible connectorThermo-meter
Pressure gauge
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Appendix 3Solubility curve of LiBr solution
t
100.0
75.0
50.0
25.0
0.0
-25.0
-50.050.0 55.0 60.0 65.0 70.0 50.0
LiBr %
Crystallization temperature curve of LiBr solution
(smoothed values) Horizontal axis: LiBr %
Vertical axis: Crystallization temperature
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Appendix 4Users water system linkage diagram
3
: 1AC250V,5A
()
Q131 Q132 Q141 Q142 Q152Q151
Control cabinet for Hope Deepblue steam-fired absorption chiller
Chilled water pump run command
Cooling water pump run command
Cooling tower fan run command
Note: 1. The capacity of the output relays for the linkage terminals of above
water pumps is AC 250V, 5A (resistance load). 2. Q131, Q132, Q141, Q142, Q151 and Q152 are code numbers for wires
in the control cabinet. Please pay attention not to misconnect them. 3. While running the unit, make sure the chilled water pump and cooling
water pump are in linkage control.
Non-voltage output
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Appendix 5Control cabinet I/O terminals
T3A
PE
V4
04
PEL1
NNL2
0102
03
V2U2
L3W2
U4
0506
0807
09
15
W4NN
1211
1013
14
A07
A03
NN
1816
1719
20
T0A
L3NN
PEL1
L2U2
V2U4
W2V4
A131
VPVP
E211
E22
A142
A141
A132
A152
A151
W4NN
NNA07
A03
PE
T0BT0CT1AT1B
T2B
T2A
T1C
T2C
A132
VPE21
VPA131
E22
A142
A151
A141
T0A
A152
T1C
T1A
T0C
T0B
T1B
T2B
T2A
T3A
T2C
YW4
32
VP
26
W5U5
V5A172THR
2221
2325
24
E241
YW1
YW3
YW2
2927
2830
31
E07
YW5
VP
33
YW5
VP
V5U5
W5THR
A172
YW2
E241
YW1
YW3YW4
T3C
T3B
T5B
T5A
T5C
E07
VP
T3C
T3B
T5B
T5A
T5C
4041
4342
4445
4746
4853
4951
5052
5554
6157
5659
5860
6362
NN
3839
NNA11
NNA12
NNA11
A12
NN
T4A
T4BT4C
T4A
T4C
T4B
E21
JXP
JXP
3435
3637
HTG
tem
p C
oolin
g w
ater
in
let t
emp
Evap
orat
ion
tem
p C
hille
d w
ater
in
let t
emp
Chi
lled
wat
er
outle
t tem
p So
leno
id
valv
e se
t Va
cuum
pu
mp
Ref
riger
ant
pum
p th
erm
al
prot
ectio
n
Ref
riger
ant
pum
p
Pow
er su
pply
to
cont
rol c
abin
et
Exte
rnal
ac
oust
oopt
ic
war
ning
Coo
ling
tow
er fa
n C
oolin
g w
ater
pu
mp
Chi
lled
wat
er
pum
p
Liqu
id le
vel
elec
trode
term
inal
So
lutio
n pu
mp
term
inal
H
TG
high
pr
essu
re
faul
t
Coo
ling
wat
er
cut-o
ff
Chi
lled
wat
er
cut-o
ff
Dec
ryst
alliz
ing
tube
tem
p
Thermal Technologies Europe AB | www.thermatec.se | [email protected] p. 41
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42
Appendix 6Electrical principle diagram
Electrical Principle Diagram
Thermal Technologies Europe AB | www.thermatec.se | [email protected] p. 42