Systems Guide

Grundfos System GuideCommercial Building Services

Version 3

GRUNDFOS FLOW THINKINGBeing responsible is our foundation

Thinking ahead makes it possibleInnovation is the essence

Grundfos System

Guide Com

mercial Building Services Version 3

96 4

7 97

83

0905

G

B

www.grundfos.com

Introduction

Heating

Air-Condition

Pressure Boosting

Wastewater

Tool box

Reference project

FLOW THINKING

FLOW THINKING

How to use

Drawing library

Introduction

FLOW THINKING

4 5

How to use How to use

The Flow THINKING is a concept especially developed for our partners in commercial building services

FLOW THINKING means: > Focusing on the customer > Embracing system knowledge > Being a competent partner & adviser > Finding the right solutions > Providing tools for your daily work

As an element of this concept we have developed The Gundfos System Guide

The Grundfos System Guide is an extensive reference book, which goes through the standard systems within:

heating air-conditioning pressure boosting wastewater

The systems are evaluated, and the Guide gives recommendations on how to prepare the most energy-optimal, reliable and comfortable system, considering the components, which form your system.

ContentsThe Guide contains a short review of a few theoretical areas within the mentioned systems. This is meant as a tool box, which can be used across of systems.

Overview: Here a short overview is given of the individual systems, and which Grundfos pumps are recom-mended for use in the system.

System description: In this paragraph the specific systems are reviewed in details. Suggestions are given of how to build up the system, so that the interaction between the components in the system is optimised with regard to comfort, safety and energy. Here we focus on how speed-regulated pumps are used in the systems.

How to select: Here it is shown how the pump/pump system is dimensioned and selected, provided the system is built up as described under system description.

A Guide not a collection of formulasThe System Guide is designed to be a practical tool for professionals, who already have the theoretical knowledge about systems. So the System Guide is not a completely slavish going through the structure of all systems, but it can with advantage be used as a source of inspiration or a checklist.

The System Guide has been designed in co-operation with system specialists from all over Europe. Even though many areas have been harmonized, there may still be examples of system constructions, which traditionally are not used locally

Always updatedGrundfos will in future continue to design and spread competences within systems. So regularly there will be supplements to the Grundfos System Guide.

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4 5

How to use How to use

Pump

Chiller

Cooling Tower

Cooling Tower

Cooling Tower

Buffer Tank

Fan Coil2 pipe type

Fan Coil4 pipe type

Fan CoilCombination type

Air UnitIn-let

Air UnitOut-let

CoolingSurface

HeatingSurface

Heat/CoolRecoveringSurface

FLOW THINKING FLOW THINKING

M

MMMM

MMM

-++

6

How to use

D

PressureraizingUnit

DiaphragmTank

Exspansion tankOpen Type

Hot WaterTankWith Heat Element

Hot WaterStorage Tank

Boiler

Heat excanger

Radiator

Termastaticradiator valve

Throttle valve

Isolation valve

Non return valve

2 way motor valve

3 way motor valve(divide)

3 way motor valve(collecting)

Pressure controlvalve

Pressure relief valve

Safety valve


6

How to use

Overview

System/products Product description

Application System

Main pumps Boiler shunt Mixing loops Heat surfaces Heat recovery DHW circulation DHW production

How to select

Main pumps Boiler shunts Mixing loops Heat surfaces Heat recovery DHW circulation DHW production

2. Heating

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8 9

2. Heating 2. Heating

Main pumps O X X O X O X

Boiler shunts O O X O X

Mixing loops O O X X

Heat surfaces O O X X

Heat recovery O X O X O

DHW circulation X X X X X X

DHW production X X X

UPS

Ser

ies

100

UPS

Ser

ies

200

UPE

Ser

ies

200

0

TPE

Seri

es 2

00

0

TP TPE

Seri

es 1

00

0

NB/

NK

NB

E/N

KE

Seri

es 1

00

0

First choice = X Second choice = O

Product Type

System Type

S /

Overview

Heat recovery

Heating surfaces

Main Pumps

Boiler shunts

HeatProduction

Mixingloop

HW HWC CW

DWH

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8 9


P /

Overview

PC User level(BMS supply)

Sub-station level(BMS supply)

Component level(Grundfos)

PMU G10M t p

External alarm X X X X X

Remote control X X X X X

GENIbus X X X X X

LONbus X X X X X

External Start/Stop X X X X X

Analog input X X X X

External sensor X X

UPS

Ser

ies

100

UPS

Ser

ies

200

UPE

Ser

ies

200

0

TPE

Seri

es 2

00

0

TP TPE

Seri

es 1

00

0

NB/

NK

NB

E/N

KE

Seri

es 1

00

0


Product Type

Communication

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P /

Overview

PMU

PFU

Delta Control

PCU

Management unit for up to 8 pumps

Preset controllerfor up to 4 pumps

Complete controlpanel for up to

4 pumps

Contact unit forup to 4 pumps

UPE Series 2000TPE Series 2000

Inline E-pumps

Inline E-pumpsEndsuction E pumpsInline (Endsuction)

PMUPFU

2.2 kW22 kW

2.2 kW22 kW

22 kW630 kW (315 kW)

Functionality Used in Max. kW connection pump size with

p

FLOW THINKING

250

H[m]

200

150

100

807060

50

40

30

20

15

109876

5

4

3

22 3 4 6 8 10 15 20 30 40 60 80 100 150 200 300 400 600 1000 2000 4000 6000

Q [m3/h]

10 11


P

Overview

Heating Product RangeSurvey curve 50 Hz

NB: 0,37 - 30 kWNK: 0,37 - 315 kWTP: 0,37 - 630 kW

TPE Series 20000,37 - 7,5 kWTPE/NBE/NKE Series 10000,37 - 22 kW

UPS Series 100UPS Series 200UPE Series 20000,06 - 2,2 kW

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F /

Features

S

Wide product range

Wide system range

Support tools

I

Easy electrical connection

Easy access to speed regulator

Clear user interface

Integrated frequency converter

No need for motor protection

O

Very low noise level

High quality material

Varible speed

High efficiency

Benefits

S

Only one supplier

Easy selection

Safe selection

I

Easy/safe installation

Safe/quick commencement Quick commencement Safe installation

Low installation cost

O

High comfort

Long lifetime

Energy saving

Low operation cost

Overview

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UPS S 100

T D Temperature -25 to +110C Pressure PN 10 (10 bar) Power range 25W to 250W Speed 1 to 3 speed Connections Unions; Flanges Port to port 130 to 250 mm Pump housing Cast iron; Bronze Stainless Steel

C None

M P F

Easy electrical connection Easy access to speed regulator Very low noise level High quality material High efficiency No need for motor protection Wide product range Wide application range

M C B

Installer: Easy installation Only one supplier 2 years warranty End user: Maintenance free Long lifetime Low operating cost High comfort

Overview

UPS Series 100

Q[m/h]

H[m]

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UPS S 200

T D

Temperature -10 to +120C Pressure PN 10 (10 bar) Power range 250W to 2200W Speed 3 speed Connections Flanges (PN6/10) Port to port 220 to 450 mm Pump housing Cast iron; Bronze

C Alarm module (accessories) GENIbus module (accessories)

M P F Easy electrical connection Water lubricated bearings Very low noise level High quality material High efficiency Motor protection module Wide product range Wide application range

M C B

Installer: Easy installation Only one supplier Easy to start-up End user: Long lifetime Maintenance free Low operating cost High comfort

Overview

UPS Series 200

Q[m/h]

H[m]

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UPE S 2000

T D

Temperature +2 to +95C Pressure PN 10 (10 bar) Power range 60W to 2200W Speed Variable speed Connections Unions; Flanges Port to port 130 to 450 mm Pump housing Cast iron; Bronze

C

Alarm relay Digital input Analog input GENIbus

M P F

Easy electrical connection Water lubricated bearings Very low noise level High quality material High efficiency Integrated frequency converter No need for motor protection Wide product range Communication

M C B

Installer: Easy installation Only one supplier Easy start-up End user: Long lifetime Very low operating cost Very high comfort Access to operation data

Overview

UPE Series 2000

Q[m/h]

H[m]

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16 17


TPE S 2000

T D

Temperature -25 to +140C Pressure PN 16 (16 bar) Power range 1.1kW to 7.5kW Speed Variable speed Connections Flanges Port to port 280 to 450 mm Pump housing Cast iron

C


M P F

Easy electrical connection Integrated frequency converter Integrated diff. pressure sensor High quality material High efficiency No need for motor protection Wide product range Cataphoresis treated Communication

M C B

Installer: Easy installation Easy start-up Only one supplier End user: Long lifetime Very low operating cost High comfort Access to operation data

Overview

TPE Series 2000

Q[m/h]

H[m]

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TP

T D

Temperature -25 to +150C Pressure PN 10/16/25 Power range 0.37kW to 630kW Speed 1 speed Connections Flanges Port to port 280 to 1400 mm Pump housing Cast iron; Bronze

C

None

M P F

High quality material High efficiency Wide product range Twin head pumps Wide application range Standard motor Cataphoresis treated

M C B

Installer: Easy installation Only one supplier End user: Long lifetime Low operating cost High comfort

Overview

TP

Q[m/h]

H[m]

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TPE S 1000

T D

Temperature -25 to + 140C Pressure PN 16 (16 bar) Power range 1.1kW to 22kW Speed Variable speed Connections Flanges Port to port 280 to 450 mm Pump housing Cast iron

C


M P F

Easy electrical connection Integrated frequency converter High quality material High efficiency No need for motor protection Wide product range Cataphoresis treated Communication

M C B


Overview

TPE Series 1000

Q[m/h]

H[m]

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NB/NK

T D

Temperature -10 to + 140C Pressure PN 16 ( 16 bar ) Power range 0.37 KW to 315 KW Speed 1 speed Connections DN 32 - 300 Pump housing Cast iron, Bronze

C

None

M P F

Flexibility High quality material High efficiency Wide product range Spacer coupling Wide system range Standard motor

M C B

Installer: Easy installation Only one supplier End user: Long lifetime Low operating cost

Overview

NB/NK

Q[m/h]

H[m]

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20 21


NBE/NKE S 1000

T D

Temperature -10 to +140C Pressure PN 16 ( 16 bar ) Power range 0.75 KW to 7.5 KW Speed Variable Connections DN 32 - 125 Pump housing Cast iron

C


M P F

Easy electrical connection Integrated frequency converter High quality material High efficiency No need for motor protection Wide product range Communication

M C B


Overview

NBE/NKE Series 1000

Q[m/h]

H[m]

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M

F

Due to variation in the heat demand and the flow, we recommend to use speed controlled pumps in parallel as main pumps. Maximum 3 pumps plus 1 as standby pump. By speed controlling all the pumps it is possible to obtain the maximum energy saving.

D

Flow per Pump Pump type m3/h

0 - 60 UPE Series 2000

60 - 100 TPE Series 2000

100 - 300 TPE Series 1000, NBE/NKE Series 1000

300 - 1000 NK + External freq. converter

300 - 3000 TP + External freq. converter

It is important to check the efficiency at the duty point where the system has a high number of operating hours.

I

Using UPE and TPE Series 2000, no external pres-sure sensor and motor protection is necessary, only a PMU is needed for parallel operation. It is possible to have proportional pressure without a sensor placed in the system.For pumps above 22 kW both external sensor, motor protection and a pump control unit is necessary.

System description

Flow variation in areference year (8760 hours)

Flow%

Hours/year

Duty point with a high numberof operating hours

Flow

When pumps are installed in parallelnon-return valves must be installed

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B

F

The primary task of the boiler shunt pump is to ensure that the temperature differences between top and bottom of the boiler are not too big, big temperature differences cause tension in the mate-rial and thus reduce the life of the boiler.For certain types of fuel there is a risk of corrosion at too low temperatures at the bottom of the boiler. Maximum safety is ensured when using a control-led pump, and the energy saving is optimal.

D


0 - 300 TPE Series 1000



Often the pumps have high flow and low head, and then it is important to check the NPSH value of the pump.

I

TPE Series 1000: The pumps have an integrated frequency converter and a motor protection. A temperature transmitter with an output signal of 0/5-10V or 0/4-20 mA should be used. R100 remote control is used for start-up and later reading out of operating data.TP/NK: The mentioned pump types require an exter-nal frequency converter and an external regulator.

System description

tF90C

tR50C

t = 40C

Head m

NPSHm

Max. flow

Flow

Flow

Placing of temperature sensor

t

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M

F

Due to variation in use and heat demand in differ-ent parts of the building, the system is divided into zones controlled by a mixing loop. The flow temperature will be lower than in the mains sup-ply, which will result in a higher flow in the zone than in the mains supply. This will help obtain a better hydraul-ic balance in the total system. Speed controlling the pump makes it possible to obtain the maximum energy saving.

D



60 - 100 TPE Series 2000

When using a two-way valve, the pressure lost in the valve will be managed by the main pump. When using a three-way valve, the pump in the mixing loop also has to manage the pressure lost in the valve.

I

Using UPE and TPE Series 2000 there is no need for an external pressure sensor and a motor protection. It is possible to have proportional pressure without a sensor placed in the system.

System description

Q = 4.3 m3/h

tF = 60C

tF = 80C

Q = 2.15 m3/h

tF = 40C

tF = 40C

= 100kW

MM

ppump

Mixing loop with 2 way valve

M

ppump

Mixing loop with 2 way valve

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H

F

A heating surface heats the air which through the ventilation system is blown into the building. The temperature in the heating surface depends on the outdoor temperature and is controlled by way of the ventilation systems control unit. The system has a constant flow and variable temperature, where it is important that the flow is correct. Normally the flow is adjusted by a regulating valve, it may also be an advantage to use an adjustable pump (E-pump).

D



60 - 300 TPE Series 1000

I

UPE Series 2000:The pump is set to constant curve and then adjusted to the correct flow. TPE Series 1000:The pump is set at uncontrolled mode, and then adjusted to the correct flow.This is easily done with remote control R100.

System description

Flow adjustedwith a valve

Flow adjustedwith a pump

M

M

Head

Power

Max. speed


Correct flow

Flow

p valve

Head

Power

Max. speed

Correct flow

Flow

Reduced speed


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H

F

The purpose of the system is to recover the heat of the outlet air. The primary task of the pump is to ensure an optimal flow between the heating surfaces. The pump/valve is controlled from the general control unit of the ventilation system. The saving potential of using a controlled pump in stead of a three-way valve to reach the correct temperature is very big.

D


0 - 300 TPE Series 1000

The total efficiency of the system depends onwhether the circulated quantity of water is correct. If there is a risk of temperatures below 0C in the air intake of the system, the system must be applied with an antifreeze agent. If a 37% glocyl mixture is used, this will protect against frost down to 20C.

I

The pump is set at uncontrolled, and the signal from the central control unit is connected to the analog entry (0/5-10v or 0/4-20 mA). R100 remote control must be used in connection with setting up the pump.

System description

M

3 way valve controlled system

Pump controlled system

System efficiency = t2 - t1t3 - t1

Air out Air in

t1

t2t3

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H

F

The purpose of the system is domestic hot water heating. The function of the circulator pump is to ensure that hot water is always available as close to the tapping point as possible, in order to reduce waste of water and increase the comfort. In certain installations (loading circuits) the pump can at the same time ensure the circulation between the inverter and the storage tank.

D

Flow per Pump Pump type m3/h Uncontrolled Controlled

0.5 - 6 UPS Series 100 TPE Series 1000

6 - 60 UPS Series 200 TPE Series 1000

60 - 300 TP TPE Series 1000

Normally uncontrolled pumps are used, because usually the flow variation is only small. It may be advantageous to use controlled pumps for adjust-ment of the flow when starting up the system, though.In large systems it will also be an advantage to use a temperature controlled pump.

I

Because of the contents of gasses in water, it is important that this gas is not gathered in the pump, thus reducing the lifetime of the pump. Therefore it is always recommended to install the pump with upward flow direction, and minimum horizontal flow direction.

System description

Cold water

Hotwater

Hotwater

circulation

Temperaturetransmitter

Cold water

Hotwater

Hotwater

circulation

Cold water

Air-vent

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26 27


H

F

To make the system as flexible as possible, the heating and storage of the domestic hot water are divided into two units, one for heating and one for accumulation of the hot water. The construction of the systems among others depends on the kind of heat exchanger (charger) used. The pump is con-trolled by the temperature in the storage tank, either ON/OFF or variable speed.

D

Flow per Pump Pump type m3/h Uncontrolled Controlled

0.5 - 6 UPS Series 100 TPE Series 1000

6 - 60 UPS Series 200 TPE Series 1000

60 - 300 TP TPE Series 1000

If one pump is used for both accumulation and circulation, the minimum flow of the pump must be the same as the required flow for circulation.

I

If the pump is installed on the hot side of the exchanger, it must be ensured that the temperature does not exceed required max. temperature, as this may cause lime depositing in the pump. Because of the contents of gasses in water, it is important that this gas is not gathered in the pump, thus reducing the lifetime of the pump. Therefore it is always recommended to install the pump with upward flow direction, and minimum horizontal flow direction.

System description

Recirculation pump

Charge pump

Hot waterstorage tank

M

HWC

CW

HW

Recirculation andcharge pump

M


HWC

CW

HW

Chargeexchanger

Recirculationexchanger

Charge pump Recirculation pump


HW

CW

HWC

M M

FLOW THINKING

28 29


M

Q

Step 1: Define total m2 heated area ex. 20,000 m2

Step 2: Define heat loss per m2 ex. 50 W/m2 (total heat loss 1,000 kW) Step 3: Define t of the system ex. t 20C (flow 43 m3/h) Step 4: Define p of the pump ex. 10 m Step 5: Find the exact pump in the data booklet ex. TPE 80-180 3.0 kW

How to select

100 W/m2 = Old building (low insulation)

75 W/m2 = Old building (medium insulation)

50 W/m2 = New building (high insulation)

t = 40C ex. (tF 90C - tR 50C)t = 30C ex. (tF 80C - tR 50C)t = 20C ex. (tF 70C - tR 50C)t = 10C ex. (tF 60C - tR 50C)

W/m2 = 100W/m2 = 75W/m2 = 50

t = 40Ct = 30C

t = 20C

t = 10C

= 1 pump + 1 stand-by pump (wet runner)

= 1 pump + 1 stand-by pump (dry runner)

= 2 pumps + 1 stand-by pump (dry runner)


Hea

ting

dem

and

in [k

W]

Hea

t in

[m]

Heated area in [m2]

Flow in [m3/h]

FLOW THINKING

28 29


M

Q

Step 1: Define total m2 heated area Step 2: Define heat loss per m2

Step 3: Define t of the system Step 4: Define p of the pump Step 5: Find the exact pump in the data booklet

How to select

100 W/m2 = Old building (low insulation)

75 W/m2 = Old building (medium insulation)

50 W/m2 = New building (high insulation)

t = 40C ex. (tF 90C - tR 50C)t = 30C ex. (tF 80C - tR 50C)t = 20C ex. (tF 70C - tR 50C)t = 10C ex. (tF 60C - tR 50C)

W/m2 = 100W/m2 = 75W/m2 = 50

t = 40Ct = 30C

t = 20C

t = 10C

= 1 pump + 1 stand-by pump (wet runner)

= 1 pump + 1 stand-by pump (dry runner)



Hea

ting

dem

and

in [k

W]

Hea

t in

[m]

Heated area in [m2]

Flow in [m3/h]

FLOW THINKING

30 31


M

S 1:

Calculate the flow required in the system: x 0.86 (tF-tR) = Heat demand in [kW] Q = Volume flow rate in [m3/h] tF = Dimensioning flow pipe temperature in [C] tR = Dimensioning return-pipe temperature in [C] 0.86 is the conversion factor (kcal/h to kW)

Calculate the heat required in the system:The value to the end farthest off or the high value of the system is the basis for pump dimensioning.

S 2:

Lay down the flow variation of the system: Ex. of variation in the flow: 100% flow for 5% hours

75% flow for 10% hours



S 3:

Lay down the operating hours per year: System with domestic hot water production:8,760 hours/year.System without domestic hot water production, depending on the location: ex. 5,500 hours/year.

S 4:

Define if it is profitable to speed control the pump depending on variation in flow and duration of variation.

How to select

= QHead[m]

Max.duty point

Systemcharacteristics

Requiredhead

Flow required Flow [m3/h]

= Variation in flow= Calculation profile

Operating hours in %

Flow in %

%

Profitable to speedcontrol the pump

Unprofitable to speedcontrol the pump

Max

. var

iati

on in

flow

Duration of variation in flow%

FLOW THINKING

30 31


M

S 5:

Define number of pumps in the system

Systems with constant flow:Pumps in operation and stand-by pumps.When there is no variation in the flow, 1 pump in operation and 1 stand-by pump are probably the solution. Here, the efficiency in the duty point is very important.

Systems with variable flow:

Having variation, it can be profitable to choose more than 1 pump together with 1 stand-by pump. Here it is also important to check the efficiency in the duty point where there are a lot of operating hours.

S 6:

Where to place the transmitter:

Define where to place the differential pressure transmitter. For smaller systems it is possible to use pumps (pumps up to 7.5kW) with integrated transmitter and controller; the pressure loss compensation will be managed by the built-in controller.For larger systems the differential pressure trans-mitter can be placed either over the pump or at a critical point in the system.

How to select

Head in[m]

Flow in [m/h]

Duty point with a lot of operating hours

p pump

p system

Flow

FLOW THINKING

32 33

2. Heating 2. HeatingHow to select

M .

S D:

80,000 m2 old renovated building 75 W/m2

Heat demand: (80,0000 m2 x 0.075 W/m2) 6,000 kW Flow temperature (tF): 90C Return temperature (tR): 50C t : (90C 50C) 40C Flow ((6,000x0.86)/40) 129 m3/h p at max. flow (129 m3/h): 18 m

S:

1 constant speed pump + 1 stand-by pump Selected pump: 2 x NK 80-250/259 Motor size: 2 x 11.0 kW

Variation in flow:

100% flow for 5% hours 75% flow for 10% hours



Operating hours per year: 8,760 hours

E :

Flow Hours Effect Energy [%] [h] [kW] [kWh]

100 438 9.8 4,292

75 876 8.3 7,270

50 3,066 6.6 20,235

25 4,380 4.8 21,024

Total 8,760 Total 52,821

Heating production

Distribution net

tF

tR

poutlet pinlet pinlet poutlet =p pump system

Q[m/h]

H[m]

NK

FLOW THINKING

32 33


M .

How to select

S D:

80,000 m2 old renovated building 75 W/m2

Heat demand: (80,0000 m2 x 0.075 W/m2) 6,000 kW Flow temperature (tF): 90C Return temperature (tR): 50C t : (90C 50C) 40C Flow ((6,000 x 0.86)/40) 129 m3/h p at max. flow (129 m3/h): 18 m

S:

2 speed controlled pumps + 1 stand-by pump Selected pump: 3 x TPE 80-240 Motor size: 3 x 5.5 kW

Variation in flow:




E :


100 438 10.3 4,551

75 876 5.9 5,168

50 3,066 3.62 11,099

25 4,380 1.31 5,738


Heat production

Distribution net

tF

tR

poutlet pinlet pinlet poutlet =p pump system

Flow in [m/h]

Head in[m]

FLOW THINKING

34 35


M

S 1:

1 constant speed pump + 1 stand-by pump Selected pump: 2 x NK 80-250/259 Motor size: 2 x 11.0 kW Control panel: Motor protection Change-over switch Access to system data: No Price index: 100 (4,500 EURO)

S 2:

2 speed controlled pumps + 1 stand-by pump Selected pump: 3 x TPE 80-240 Motor size: 3 x 5.5kW Controller: PMU Access to system data: Yes Price index: 162 (7,290 EURO)

C/:

The comparison of the two systems makes it clear that the large savings are gained by reduced flow. Already at a flow of 75% the savings are 29%. In addition to the energy saving there is also an in-crease in comfort, due to the reduced pressure and thereby reduced noise in the system valves.Depending on the energy price the pay-back time is very short for the extra costs of the speed controlled pump system. At a cost of 0.1 EURO per kWh, the pay-back time is approximately 1.1 years.

How to select


100 438 9.8 4,292

75 876 8.3 7,270

50 3,066 6.6 20,235

25 4,380 4.8 21,024

Total Total 8,760 52,821


100 438 10.3 4,551

75 876 5.9 5,168

50 3,066 3.62 11,099

25 4,380 1.31 5,738


Flow Sys.1 Sys. 2 Savings Savings [%] [kWh] [kWh] [kWh] % 100 4,292 4,551 -259 -6

75 7,270 5,168 2,102 29

50 20,235 11,099 9,136 45

25 21,024 5,738 15,286 72

Total 52,821 26,516 26,305 50

FLOW THINKING

34 35


B .

How to select

S D:

Boiler effect: 2,000 kW Flow temperature (tF): 90C Return temperature (tR): 50C Return temperature (tRB): 70C Flow (QSH): 86 m3/h p with max. flow (129 m3/h): 8 m

S:

1 Constant speed pumpSelected pump: 1 x CLM 125-211Motor size: 1 x 4,0 kW

Variation in flow:



E : Flow Hours Effect Energy [%] [h] [kW] [kWh]

100 1,833 3.7 6,782

75 1,833 3.7 6,782

75 1,833 3.7 6,782


tF90C

tR50C

tRB70C

H

Q

Max. loadmain system Min. load

main system

pvalve

FLOW THINKING

36 37


B .

How to select

S D:

Boiler effect: 2,000 kW Flow temperature (tF): 90C Return temperature (tR): 50C Return temperature (tRB): 70C Flow (QSH): 86 m3/h p with max. flow (129 m3/h): 8 m

S:

1 Constant speed pumpSelected pump: 1 x CLME 125-211Motor size: 1 x 4,0 kW

Variation in flow:



E : Flow Hours Effect Energy [%] [h] [kW] [kWh]

100 1,833 3.5 6,415

75 1,833 1.3 2,383

50 1,833 0.4 773


tF90C

tR50C

tRB70C

H

Q

Max. loadmain system Min. load

main system

t

FLOW THINKING

36 37


M .

S D:

Example with two-way valve: Heat demand in the zone: 60 kW Flow temperature main system (tF): 90C Flow temperature in the zone (tFZ): 70C Return temperature in the zone (tRZ): 40C Flow ((60 x 0.86)/30): 1.72 m3/h p zone at max. flow (1.72 m3/h): (radiators+RTV+pipes/valves)(0.2+0.8+1.0): 2 m

S:

1 speed controlled pump Selected pump: UPE 25-40 Motor size: 1 x 60 W Operating hours per year: 5,500

With an MC module it is possible to have an alarm from the pump.With an MB module it is possible to have GENIbus communication, + G10 (gateway) being LONWORK.

E :

Flow Hours Effect Energy [%] [h] [W] [kWh] 100 275 54 14.9

75 550 44 24.2

50 1,925 36 69.3

25 2,750 29 79.8

Total 5,500 Total 118.2

How to select

Q zone:1.72 m/h

tFZ 70C

tRZ 50C

p pump:2.0 m

tF 90C

Q main1.03 m/h

M

Alarm: outputMin./Max. curve: inputStop/start: inputAnalog 0-10V: input

Min./Max. curve: inputStop/start: inputGENIbus: in/output+ G10 LONWORK: in/output

MB40/60

MB40/60

Powersupply

Powersupply

G10

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M .

S D:

Example with three-way valve: Heat demand in the zone: 60 kW Flow temperature main system (tF): 90C Flow temperature in the zone (tFZ): 70C Return temperature in the zone (tRZ): 40C Flow ((60 x 0.86)/30): 1.72 m3/h p zone at max. flow (1.72 m3/h): three-way valve: 2.0 m (radiators+RTV+pipes/valves)(0.2+0.8+1.0): 2.0 m Total p: 4.0 m

S:

1 speed controlled pump Selected pump: UPE 25-80 Motor size: 1 x 250 W Operating hours per year: 5,500

With an MC module it is possible to have an alarm from the pump.With an MB module it is possible to have GENIbus communication, + G10 (gateway) being LONWORK.

E :

Flow Hours Effect Energy [%] [h] [W] [kWh]

100 275 130 35.8

75 550 107 58.9

50 1,925 89 171.3

25 2,750 78 214.5

Total 5,500 Total 480.5

How to select

Q zone:1.72 m/h

tFZ 70C

tRZ 50C

p pump:4.0 m

tF 90C

Q main1.03 m/h

M

Alarm: outputMin./Max. curve: inputStop/start: inputAnalog 0-10V: input

Min./Max. curve: inputStop/start: inputGENIbus: in/output+ G10 LONWORK: in/output

MB80

MB80

Powersupply

Powersupply

G10

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H .

S D:

Example with constant speed pump: Heat demand: 100 kW Flow temperature main system (tF): 75C Flow temperature (tFS): 50C Return temperature (tR): 25C Flow ((100 x 0.86)/25): 3.4 m3/h p at max. flow (3.4 m3/h): (surface+pipes/valves)(1.5+0.8+1.0): 3.3 m

S:

1 constant speed pump Selected pump: UPS 25-80 Motor size: 1 x 250 W Operating hours per year: 5,500

The pump is set at speed 3, and the flow is adjusted to calculated flow. At speed 3 and a flow of 3.4 m3/h the head is 5.8 m. The pressure loss over the adjustment valve has to be (5.8 3.3) = 2.5 m more than at fully open valve.

E :


100 5,500 221 1,216


How to select

Air flow Adjustmentvalve

Constantspeed pump

tR

tFS tF

M

Head

Flow

Adjustmentvalve

5.8 m

3.3 m

3.4 m/h

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H .

S D:

Example with variable speed pump: Heat demand: 100 kW Flow temperature main system (tF): 75C Flow temperature (tFS): 50C Return temperature (tR): 25C Flow ((100 x 0.86)/25): 3.4 m3/h p at max. flow (3.4 m3/h): (surface+pipes/valves)(1.5+0.8): 2.3 m

S:

1 constant speed pump Selected pump: UPE 25-80 Motor size: 1 x 250 W Operating hours per year: 5,500

The pump is set at constant curve and adjusted to the right flow. The total head is lower due to no adjustment valve in the system. At the same time it is possible to communicate with the pump.

E :


100 5,500 140 770

Total 5,500 Total 770

S:

The energy saving compared to an installationwith an adjustment valve:(1,216-770) = 446 kWh = 27%Moreover, an adjustment valve is not required(costs saved).

How to select

Air flow

Variablespeed pump

tR

tFS tF

M

Head

Flow

Max. curve

2.3 m

3.4 m/h

Reduced speed

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H .

S D:

Example with three-way valve: Heat transfer: 200 kW Temperature air (t1): - 12C Temperature air (t2): +10C Temperature air (t3): +22C Temperature liquid (tF): +12C Temperature liquid (tR): + 0C t liquid system (12-0): +12C Anti-freeze protection down to: -20C Calculation of flow: Flow water((200 x 0.86)/12): 14.3 m3/h Compensation factor for anti-freeze: 1.14 (The specific heat drops by 20%) (Density increase 6%) Flow with anti-freeze liquid (14.3x1.14): 16.3 m3/h p system at max. flow three-way valve: 3.3 m (heat surface+pipes/valves)(2.3+1.0): 3.3 m Compensation factor for anti-freeze: 1.3 Total p: ((3.3+3.3) x 1.3) 8.6 m

S:

1 constant speed pump Selected pump: TP 65-120 Motor size: 1 x 1.1 kW Operating hours per year: 5,500

Due to higher density the power consumption P2 will increase from 675 W to 715 W (P1=890W). To prevent overload of the motor it is important to check the max. P2 value of the motor. In this case the value is 1100 W, which gives a good safety margin. A dry-runner has been selected to avoid problems with condensation in the motor, and the shaft seal is of the RUUE type due to the liquid with glycol.

How to select

Air flowoutlet

Air flowinlet

t3

tR

tF

t1

t2M

Freezing pointPropylene glycol

Ethylene glycol

Glycol

Glycol

Ethylene glycol 0C 10C 0C 10CPropylene glycol

Density kg/m3

C

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H .

S D:

Example speed controlled pump: Heat transfer: 200 kW Temperature air (t1): -12C Temperature air (t2): +10C Temperature air (t3): +22C Temperature liquid (tF): +12C Temperature liquid (tR): + 0C t liquid system (12-0): +12C Anti-freeze protection down to: -20C Calculation of flow: Flow water((200 x 0.86)/12): 14.3 m3/h Compensation factor for anti-freeze: 1.14 (The specific heat drops by 20%) (Density increase 6%) Flow with anti-freeze liquid (14.3 x 1.14): 16.3 m3/h p system at max. flow (heat surface+pipes/valves)(2.3+1.0): 3.3 m Compensation factor for anti-freeze: 1.3 Total p: (3.3 x 1.3) 4.3 m

S:

1 speed contolled pump Selected pump: TPE 65-60 Motor size: 1 x 0.55 kW Operating hours per year: 5,500

The pump is set at uncontrolled mode, and via the 0-10V analog input it is controlled by the air handling unit controller.Due to higher density the power consumption P2 will increase from 360 W to 385 W (P1=511W). To prevent overload of the motor it is important to check the max. P2 value of the motor. In this case the value is 550 W, which gives a good safety margin. A dry-runner has been selected to avoid problems with condensation in the motor, and the shaft seal is of the RUUE type due to the liquid with glycol.

How to select

Air flowoutlet

Air flowinlet

t3

tR

tF

t1

t2

Freezing pointPropylene glycol

Ethylene glycol

Glycol

Glycol

Ethylene glycol 0C 10C 0C 10CPropylene glycol

Density kg/m3

C

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H .

S 1:

1 constant speed pump Selected pump: TP 65-120 Motor size: 1 x 1.1 kW Operating hours per year: 5,500 Three-way valve: Yes Access to system data: No Price index: 100 (570 EURO)

S 2:

1 speed controlled pump Selected pump: TPE 65-60 Motor size: 1 x 0.55 kW Three-way valve: No Operating hours per year: 5,500 Access to system data: Yes Price index: 150 (860 EURO)

C/:

Using a speed controlled pump, the total pressure loss in the system drops dramatically, and it is pos-sible to get a variable flow in the system depending on the actual situation. When the flow is readjusted the pump will follow the system characteristics giving high savings. On top of the energy savings there is also a saving in investment and installation costs, as there is no need for the motor valve and the by-pass.Depending on the energy price the pay-back time is very short for the extra costs of the speed controlled pump system. At a cost of 0.1 EURO per kWh the pay-back time is 1 year.

How to select


100 5,500 890 4,895



100 2,200 511 1,124

75 2,200 308 678

50 1,100 173 190


Flow Sys.1 Sys. 2 Saving Saving [%] [kWh] [kWh] [kWh] % 100 4,895 1,124

75 678

50 190

Total 4,895 1,992 2,903 59

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H .

S D:

Example with fixed speed pump: Hotel with 320 rooms. Circulation loss per room: 200 W Total loss: 64 kW Hot water temperature (tH): 55C Circulation return temperature (tC): 45C t system: 10C Flow ((64 x 0.86)/10): 5.5 m3/h p at max. flow (5.5 m3/h): (tank+pipes/valves)(1.0+2.5+3.0): 7.0 m

S:

1 constant speed pump Selected pump: UPS 32-120 FB Motor size: 1 x 400 W Operating hours per year: 8,760

With a relay module built into the terminal box, there is no need for external motor protection, and at the same time the pump will have an alarm relay.Due to risk of corrosion the pump housing is made of bronze.

E :


100 2,920 295 861

80 2,920 277 809

60 2,920 253 739


How to select

55C

45C

5.5 m/h

7.0 m

Hotwater

Hotwater

circulation

Heat loss

Thermostaticvalve

Cold water

Air-vent

Heat loss

FLOW THINKING

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H .

S D:

Example with fixed speed pump: Hotel with 320 rooms Circulation loss per room: 200 W Total loss: 64 kW Hot water temperature (tH): 55C Circulation return temperature (tC): 45C t system: 10C Flow ((64 x 0.86)/10): 5.5 m3/h p at max. flow (5.5 m3/h): (tank+pipes/valves)(1.0+2.5+1.0): 5.0 m

S:

1 speed controlled pump Selected pump: TPE 40-60 Motor size: 1 x 370 W Operating hours per year: 8,760

There is no need for motor protection, and at the same time the pump will have an alarm relay.The pump is set at controlled mode, and the signal from the temperature transmitter is connected directly to the terminal box.

E :


100 2,920 260 760

80 2,920 185 540

60 2,920 126 368


Savings compared to a system with thermostatic valves are 30%. Furthermore, investment and total installation costs are lower.

How to select

55C

45C

5.5 m/h

5.0 m

Hotwater

Hotwater

circulation

Heat loss

Temperaturetransmitter

Cold water

Air-vent

Heat loss


storage

46

2. Heating

H .

S D:

Example with fixed speed pump: Hotel with 320 rooms. Total effect (9,600/10): 800 kW Hot water temperature (tH): 55C Cold water temperature (tCO): 8C t system: 47C Flow ((800 x0.86)/47): 14.6 m/h p at max. flow (14.6 m3/h): (tank/exchanger+pipes/valves) (1.0+3.5+0.5+1.5): 6.5 m

S:

1 speed controlled pump Selected pump: TPE 50-120 Motor size: 1 x 1.1 kW Operating hours per year: 5,110

There is no need for motor protection, and at the same time the pump will have an alarm relay. The pump is set at controlled mode, and the signal from the temperature transmitter is connected directly to the terminal box. The ON/OFF thermostat in the storage tank is also connected direcly to the terminal box.

E : Flow Hours Effect Energy [%] [h] [W] [kWh]

100 730 606 442

80 2,190 374 819

60 2,190 168 368


How to select

HW

HWC

CWCharge pump


Temp. transmitter

ON/OFF thermostatM

= Water consumption= Variation in flow charge pump= Calculation profileFlow in %

Day-and-night


46

2. Heating

Overview

System/products Product description

System description

Primary pumps Cooling towers Dry cooler Secondary pumps Cooling surfaces Cooling ceilings/floors Fan coils Heat recovery Pressure holding

How to select

Primary pumps Cooling towers Dry cooler Secondary pumps Cooling surfaces Cooling ceilings/floors Fan coils

3. Air-conditioning

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3. Air-conditioning 3. Air-conditioning

S/

Overview

Cooling tower Fan coilsCooling ceiling

Pressureholding

ChillerM

Primarypump

Heat recovery

Cooling surface

SecondarypumpsBuffer

tank

M

M

M

Primary pumps - chiller pumps

Secondary pumps - main pumps

Cooling tower

Dry coolers

Cooling surfaces

Cooling ceiling/floors

Fan coils

Heat recovery

Pressure holding

UPS

Ser

ies

100

UPS

Ser

ies

200

TPE

Seri

es 2

00

0

TP TPE

Seri

es 1

00

0

NB/

NK

NBE

/NKE

Ser

ies

1000

HS

CR/C

RE


Product Type

System Type

X X X X X

X O X O X X

O O X O X X

O X O X

O O O X

X O O

X O O

X X X X X

X X

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P /

Overview

PC User level(BMS supply)

Sub-station level(BMS supply)

Component level(Grundfos)

PMU G10M t p

External alarm

Remote control

GENIbus

LONbus

External Start/Stop

Analog input

External sensor

UPS

Ser

ies

100

UPS

Ser

ies

200

UPE

Ser

ies

200

0

TPE

Seri

es 2

00

0

TP TPE

Seri

es 1

00

0

NB/

NK

NB

E/N

KE

Seri

es 1

00

0

HS

CR CRE


Product Type

Communication

X X X X X X

X X X X X X

X X X X X X

X X X X X X

X X X X X X

X X X X X

X X X

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P /

Overview

PMU

PFU

Delta Control

PCU

Management unit for up to 8 pumps

Preset controllerfor up to 4 pumps

Complete controlpanel for up to

4 pumps

Contact unit forup to 4 pumps

TPE Series 2000

Inline E-pumps

In-Line E-pumpsEndsuction E-Pumps

In-Line

PMUPFU

22 kW

22 kW

22 kW630 kW

Functionality Used in Max. kW connection pump size with

p

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P

Overview

Air-conditioning Product RangeSurvey curve 50 Hz

H[m]

Q[m3/h]

NB: 0,37 - 30 kWNK: 0,37 - 315 kWTP: 0,37 - 630 kW

TPE Series 20000,37 - 7,5 kWTPE/NBE/NKE Series 10000,37 - 22 kW

UPS Series 100UPS Series 200TPE Series 1000TPE Series 20000,06 - 2,2 kW

HS: 110 - 1300 kW

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F /

Overview

Features

S

Wide product range

Wide system range

Support tools

I

Easy electrical connection

Easy access to speed regulator

Clear user interface

Integrated frequency converter

No need for motor protection

O

Very low noise level

High quality materials

Variable speed

High efficiency

Benefits

S

Only one supplier

Easy selection

Safe selection

I


Safe/quick start up

Quick start up

Safe installation

Lower installation cost

O

High comfort

Durability and Reliability

Energy saving and Controllability

Low operation cost

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Benefits

S

Only one supplier

Easy selection

Safe selection

I


Safe/quick start up

Quick start up

Safe installation

Lower installation cost

O

High comfort

Durability and Reliability

Energy saving and Controllability

Low operation cost

UPS S 100

Overview

T D Temperature -25 to +110C Pressure PN 10 (10 bar) Power range 25W to 250W Speed 1 to 3 speed Connections Unions; Flanges Port to port 130 to 250 mm Pump housing Cast iron; Bronze Stainless Steel

C No

M P F

Easy electrical connection Easy access to speed switch Very low noise level High quality material High efficiency No need for motor protection Wide product range Wide application range

M C B

Installer: Easy installation Only one supplier 2 years warranty End user: Maintenance free Durability Low operating cost High comfort

UPS Series 100

Q[m/h]

H[m]

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UPS S 200

Overview

T D

Temperature -10 to +120C Pressure PN 10 (10 bar) Power range 250W to 2200W Speed 3 speed Connections Flanges (PN6/10) Port to port 220 to 450 mm Pump housing Cast iron; Bronze

C Alarm module (accessories) GENIbus module (accessories)

M P F Easy electrical connection Water lubricated bearings Very low noise level High quality material High efficiency Motor protection module Wide product range Wide application range

M C B

Installer: Easy installation Only one supplier Easy to start-up End user: Long lifetime Maintenance free Low operating cost High comfort

UPS Series 200

Q[m/h]

H[m]

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TPE S 2000

Overview

T D

Temperature -25 to +140C Pressure PN 16 (16 bar) Power range 0.37kW to 7.5kW Speed Variable speed Connections Flanges Port to port 280 to 450 mm Pump housing Cast iron

C

Alarm relay Digital input Anlog input GENIbus

M P F

Easy electrical connection Integrated frequency converter Integrated diff. pressure sensor High quality material High efficiency No need for motor protection Wide product range Catephoresis coated Communication

M C B


TPE Series 2000

Q[m/h]

H[m]

FLOW THINKING

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TP

Overview

T D

Temperature -25 to +150C Pressure PN 10/16/25 Power range 0.37kW to 630kW Speed 1 speed Connections Flanges Port to port 280 to 1400 mm Pump housing Cast iron; Bronze

C

None

M P F

High quality material High efficiency Wide product range Twin head pumps Wide application range Standard motor Cataphoresis treated

M C B

Installer: Easy installation Only one supplier End user: Long lifetime Low operating cost High comfort

TP

Q[m/h]

H[m]

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TPE S 1000

Overview

T D

Temperature -25 to + 140C Pressure PN 16 (16 bar) Power range 1.1kW to 22kW Speed Variable speed Connections Flanges Port to port 280 to 450 mm Pump housing Cast iron

C


M P F

Easy electrical connection Integrated frequency converter High quality material High efficiency No need for motor protection Wide product range Catephoresis coated Communication

M C B


TPE Series 1000

Q[m/h]

H[m]

FLOW THINKING

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NB/NK

Overview

T D

Temperature -10 to + 140C Pressure PN 16 ( 16 bar ) Power range 0.37 KW to 315 KW Speed 50 Hz, 2 - 4 and 6 pol Connections DN 32 - 300 Pump housing Cast iron; Bronze

C

None

M P F

Flexibility High quality material High efficiency Wide product range Spacer coupling Wide application range Standard motor

M C B

Installer: Easy installation Only one supplier End user: Long lifetime Low operating cost

NB/NK

Q[m/h]

H[m]

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NBE/NKE

Overview

T D

Temperature -10 to +140C Pressure PN 16 ( 16 bar ) Power range 0.75 KW to 7.5 KW Speed Variable Connections DN 32 - 125 Pump housing Cast iron

C


M P F

Easy electrical connection Integrated frequency converter High quality material High efficiency No need for motor protection Wide product range Communication

M C B


NBE/NKE

Q[m/h]

H[m]

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HS

Overview

T D

Temperature -8 to + 120C Pressure PN 16 ( 16 bar ) Power range 1.5 KW to 900 KW Speed 50 Hz, 60 Hz, 2 and 4 pol Flanges 50 - 350 mm Pump housing Cast iron

C

None

M P F

Flexibility High quality material High efficiency Wide product range Mechanical seal Spacer coupling Wide application range Standard motor Available in special material and flange options

M C B

Installer: Easy installation and maintenance Only one supplier End user: Long lifetime Low operating cost

HS

Q[m/h]

H[m]

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P (C )

System description

F

Application with one chiller.The chiller is fitted with temperature sensors which control the temperature difference depending on the cooling load. Care must be taken to ensure that there is no freezing up of the evaporator coils. Because of this, a constant water flow is required and usually a fixed speed pump is installed.Control is normally via a regulating valve, but it may be possible to use a variable speed pump which is controlled according to the start/stop sequence of the chiller.

D

Flow per Pump Pump type m/h

0 - 300 TPE Series 1000



1000 - 3500 HS + External freq. converter

I

Pump is set to uncontrolled operation and then adjusted to the correct flow. It is easily done with the remote control R100.Pump terminals for start/stop input are connected. To secure a high comfort a standby pump can be added. Controller PFU will be used for alternation between two pumps.

Chiller pump

Chiller pump



Flow adjustedwith a valveHead

Power

Max. speed

Flow

Correct flow

pvalve

Flow adjustedwith a variable

speed pumpHead

Power

Max. speed

Flow

Correct flow

Reduced speed

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3. Air-conditioning 3. Air-conditioningSystem description

F

2 chillers are connected in parallel, each having their own pump.The chillers have their own control systems and as there is a risk of ice forming inside the evaporators, a constant water flow is recommended.The chillers run in cascade with the pumps being controlled by a start/stop signal from the chillers. On start, pumps start before the chillers start. On stop, pumps stop just after the chillers stop. With fixed speed (uncontrolled) pumps there is a varia-tion of pressure in the circuit hence a flow varia-tion. See diagram Solution: Using variable speed pumps the pressure drops through the evaporators are controlled by differential pressure sensors. In order to keep this pressure constant, pump performances are controlled, the right flow attained and energy consumption minimized.

D


0 - 300 TPE Series 1000




I

Pump is set to controlled operation (p control). It is easily done with the remote control R100.Pump terminals for start/stop input are connected. To secure a high comfort, a standby pump can be added. Controller PFU will be used for alternation between two pumps.

p will increase when2 pumps are running

p

p

Duty point when2 pumps are running

Duty point when1 pump is running

Uncontrolled pump

QQ2 Q1

H

H2

H1

H

H2

H1

Q2 Q

Duty point when2 pumps are running

Duty point when1 pump is running

Variable speed pump

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D

System description

F

The chiller varies its performance according to the cooling demand of the system. It is recommended that the system has a constant flow, normally adjusted by an regulating valve. It may be an advan-tage to use a variable speed pump which can pro-vide a financially viable alternative.

D


0 - 300 TPE Series 1000




In such systems, risk of frost will involve the use of glycol mixture.

I

Pump is set to uncontrolled operation and then adjusted to the correct flow. It is easily done with the remote control R100.To secure a high comfort, a standby pump can be added. Controller PFU has to be used for alternation between two pumps.

Flow adjusted with a valve

Flow adjusted with a pump

Flow adjustedwith a valveHead

Power

Max. speed

Flow

Correct flow

pvalve

Flow adjustedwith a pumpHead

Power

Max. speed

Flow

Correct flow

Reduced speed

T

T

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C

System description

F

The chiller varies its performance according to the cooling demand of the system. The cooling tower has to be controlled, in order to keep a constant return water temperature for the condenser. Usually, the cooling tower water flow is controlled by a three-way valve. The condenser has a constant flow, normally adjusted by a regulating valve.As an alternative, we recommend control of cooling tower water flow by variable speed pumps. Pumps adapt their speed according to the return water temperature measured by the sensor. The complete system has a variable flow, and therefore maximum energy savings can be obtained.

D


0 - 300 TPE Series 1000




In such systems, risk of frost will involve the use of glycol mixture.

I

Temperature sensor is placed on the return pipe. When using TPE Series 1000, no motor protection is necessary, but for bigger systems, a pump control unit must be added for parallel operation. For big-ger systems, motor protection and pump control unit are necessary.An open cooling tower must be located on the upper point of the circuit. This in order to obtain a sufficient inlet pressure to avoid cavitation in the pump.

Parallel operation

T

M

T

Hours/year

Flow

in %

Flow

FLOW THINKING

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S (M )

System description

F

Installation with 2 way valves.The demand for cooling varies greatly during the year. When the installation is equipped with two-way valves, the flow is variable. In this case we rec-ommend the use of variable speed pumps installed in parallel as main pumps. Using a PFU controller a maximum of 4 pumps can be controlled. By vary-ing the speed of all the pumps, maximum energy savings can be obtained.

D


5 - 100 TPE Series 2000

100 - 300 TPE Series 1000




It is important to check the efficiency at the duty point, where the system has a high number of operating hours.

I

Using TPE Series 2000, no external pressure sensor and motor protection is necessary, only a PMU is needed for parallel operation. It is possible to have proportional pressure without a sensor placed in the system.For bigger systems, both external sensor, motor protection and a pump control unit is necessary.

Hours/year

Flow

in %

Duty point with a high number of operating hours

When pumps are installed in parallelnon-return valves must be installed

Flow

Buffer tank

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S (M )

System description

F

The demand for cooling varies greatly during the year. When the installation is equipped with three-way valves, the flow around the primary circuit is constant, with the flow to the room coolers being controlled by the three way valves. When the cool-ing demand is low, water coming from the chiller is by-passed and the return temperature is reduced.If the chiller is not controlled by this return tem-perature, we recommend the use of variable speed pumps mounted in parallel up to a maximum of 4 pumps.By controlling the speed of all the pumps, the return temperature is maintained, and maximum energy savings obtained.

D


0 - 300 TPE Series 1000




I

Temperature sensor is placed on the return pipe after the last connecting point. Using TPE Series 1000, no motor protection is necessary, but for bigger systems, a pump control unit must be added for parallel operation. For bigger systems, motor protection and pump control unit are necessary.

Parallel operation

t

M

Hours/year

Flow

in %

Flow

M M M

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C

System description

F

A cooler battery cools the air, which is blown into the building through the air conditioning system. The temperature in the cooler battery is dependent on the outside temperature and is controlled via the air conditioning systems control unit. To ensure a good heat transmission coefficient, the system requires a constant flow. The cooler battery output is controlled by a tem-perature controller, using a mixing circuit equipped with either a two-way

Systems Guide

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