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Kroff Chillmax Training
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Transcript of Kroff Chillmax Training
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Agenda
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Chiller Components
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Chiller Refrigerant Cycle
Compressor lowers pressure in the
evaporator, allowing refrigerant to
boil and absorb heat from water.
1.
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Chiller Refrigerant Cycle
Compressor
raises pressure
of refrigerant gas and discharges
into condenser
Compressor lowers pressure in the
evaporator, allowing refrigerant to
boil and absorb heat from water.
1.
2.
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Chiller Refrigerant Cycle
Compressor
raises pressure
of refrigerant gas and discharges
into condenser
Cooling water in condenser removes heat from
refrigerant gas allowing it to condense back into liquid.
Compressor lowers pressure in the
evaporator, allowing refrigerant to
boil and absorb heat from water.
1.
2.
3.
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Chiller Refrigerant Cycle
Compressor
raises pressure
of refrigerant gas and discharges
into condenser
Cooling water in condenser removes heat from
refrigerant gas allowing it to condense back into liquid.
Metering device
maintains seal
between condenser and evaporator.
Compressor lowers pressure in the
evaporator, allowing refrigerant to
boil and absorb heat from water.
1.
2.
3.
4.
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Chiller Efficiency
" !
"
"
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What Influences Chiller Efficiency ?
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Importance of Maintaining Chiller Efficiency
""
"
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Cost of Inefficiency
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Condenser Problems
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Evaporator Problems
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Reality of Chiller Plant Operation
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Typical ChillerMaintenance Program
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Log Readings Alone Are Not Efficient
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Log Readings Alone Are Not Efficient
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Chiller Logging
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Chiller Instrumentation
Fair Better
Orange Research Weiss Instruments
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For R-11 & R-123 Low Pressure Refrigerant Chillers
Condenser Liquid
Refrigerant Temperature
Take temperature at liquid line
leaving condenser. Recommend
Raytek Model ST 60 or better.
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Condenser Saturated Refrigerant Temperature
On a Low-Pressure Refrigerant Chiller
R-11 & R-123
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Non-Condensables
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Non-Condensables
91 5.3
92 5.6
93 6.0
94 6.4
95 6.8
96 7.2
97 7.6
98 8.0
99 8.4
Sat Temp Sat Pres
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Non-Condensables
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Non-Condensables
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Condenser Approach
!"
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Condenser Water In
Condenser Water Out
Condenser
Pressure
Liquid
Refrigerant
Temperature
Temperature
Pressure
Temperature
Pressure
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Causes of High Condenser Approach
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Condenser Approach:
Clean Versus Dirty Condenser Tubes
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When Tubes Are Clean
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High Condenser Approach:When Condenser Tubes Get Dirty...
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Tube Fouling:When Condenser Tubes Get Dirty
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High Condenser Approach
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High Condenser Approach
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High Condenser Approach
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Condenser
Pressure
Liquid Refrigerant
Temperature
Temperature
Pressure
Temperature
Pressure
Pressure Drop = P in P out
Water Flow Problems
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Low Condenser Water Flow
!$!$
$
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Calculate Flow Actual Versus Design $, ,-
,$"""!#",',-'#"$""",("($""",#&,%"+%"+
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High Inlet Condenser Water Temperature! ! $!
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Evaporator Instrumentation
Evaporator Water In
Evaporator Water Out
Evaporator
Pressure
Liquid
Refrigerant
Temperature
Temperature
Pressure
Temperature
Pressure
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Evaporator Approach Problems
Evaporator Water In
Evaporator Water Out Evaporator
Pressure
Liquid
Refrigerant
Temperature
Temperature
Pressure
Temperature
Pressure
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High Evaporator Approach Can be Caused by:
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Low Evaporator Set Point
!$
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Compressor Instrumentation
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Chiller Capacity - 1,500 tons
This log sheet was taken at a chiller plant with over 40,000 tons of chiller
capacity. During your site survey you obtain the following log sheet.
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Easy and
effective.
ChillerMax:The High-Tech Solution
Operator visits all operating chillers and collects data on a daily basis
Operator hot syncs with the website for chiller report or using Autolog, log data can be entered directly
from a BAS system
Problems are identified and quantified by source Corrective actions are given and scheduled Efficiency is restored or maintained
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ChillerMax Identifies Problems
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Using the ChillerMax
Website
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Logon to ChillerMax Website using Username and Password Provided
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Using the ChillerMax Website
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Chiller Dashboard
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Solutions
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Logsheet View
Readings in
yellow indicate a
run time error
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View Charts
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Chart Trends
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Logging ChillersUsing ChillerMax
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Add Log Record
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Enter Required Data
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Digital Control Panels
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Condenser and Evaporator Readings
Water
temperatures
Water pressure
drops
Refrigerant
pressures Condenser refrigerant
temperature
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For R-11 & R-123 Low Pressure Refrigerant Chillers
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Compressor and Electrical Readings
Oil level &
temperature
Oil pressure
Amps & volts
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Using ChillerMax to Track Maintenance Tasks
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Condition Based Maintenance
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Example: Emory University
#%!$" #%" $
" #
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Internally Enhanced Tubes
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Dirty Tube
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Single Direction
Two-Direction Versus Single-Direction Tube Brushing
Two-Direction Brushing Single-Direction Brushing
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Single Direction
ChillerMax Identifies Problems
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ChillerMax Restores Efficiency
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Lessons Learned with Internally Enhanced Tubes
Use a brush designed
for internally enhanced tubes
Change brushes as required, use a bore scope to inspect tubes
Brush with a cleaning machine
using dual rotation action
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Use Borescope to Inspect Tubes
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Questions& Answers
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For additional information contact:
Don Tomovich 302-753-7940