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DOUBLE EFFECT

ABSORPTION CHILLER /HEATER

MG MODEL

1 Specifications

CH-MG150CE CH-MG200CE

Version 9.10

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Contents Page

1. General Information 1.1 Chiller-heater ...................................... 2 1.1.1 Chiller-heater Specification …………………………. 2 1.1.2 External Dimensions ………………………….. 3 1.1.3 Sound Pressure level …………………………… 6 1.1.4 Noise Criteria ………………………….. 6 1.1.5 Horizontal Characteristics …………………………… 7 1.2 Burner

1.2.1 Burner Specifications . ......................…............. 8 1.2.2 External Dimensions ………………………….. 9

2. Principle & Operating Cycle 2.1 Cycle Diagram ………………………….. 10 2.1.1 Cooling Cycle …………………………... 10 2.1.2 Heating Cycle ………………………….. 10 2.2 Component Location …………………………. 11 2.2.1 Schematic …………………………. 12 2.2.2 Detail View …………………………. 13 2.3 Component Description …………………………. 17 2.4 Cooling and Heating Cycle …………………………. 24 2.4.1 Cooling Cycle …………………………. 24 2.4.2 Heating Cycle …………………………. 25 2.5 MG Series Part Temperature Data …………………………. 26 2.6 Equilibrium Chart ………………………… 27

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1. General Information 1.1 Chiller-heater 1.1.1Chiller-heater Specifications

MODEL ITEM CH－MG150 CH－MG200

Capacity Cooling kW 527 703 Heating kW 429 572

Chilled/Hot Water

Chilled Water Temperature

Inlet ℃ 12.0 Outlet ℃ 7.0

Hot Water Temperature

Inlet ℃ 56.0 Outlet ℃ 60.0

Evaporator Pressure Loss(Max) kPa 72.3 63.7 Max Operating Pressure kPa 785.0 Rated Water Flow ｌ/s 25.2 33.6 Water Retention Volume ｌ 180 260

Cooling Water

Heat Rejection kW 892 1,190 Cooling Water Temperature

Inlet ℃ 29.5

Outlet ℃ 34.6

Abs.&Cond.Pressurel loss(Max) kPa 51.8 49.6 Max Operating Pressure kPa 785.0 Rated Water Flow ｌ/s 41.6 55.4 Water Retention Volume ｌ 430 580

Fuel Type of Fuel Natural Gas

Consumption Cooling kW 440 586 Heating kW 517 689

Electrical Power Source 400V 50Hz 3ph.+ Neutral Capacity *1 kVA 3.10 3.40

Control Cooling 35%－100% Proportional Control Heating 30%－100% Proportional Control

Combustion Burner Forced Draft (Proportion Controlled) Flame Detector Flame Rod Ignition Intermittent Spark

Dimension Width *2 mm 1,862(1951) 1,962(2046) Depth mm 3,663 3,735 Height *3 mm 2,251(2,774) 2,491(3,011)

Piping Chilled/Hot Water mm 100A 125A Cooling Water mm 125A 150A Gas Supply mm 40A 50A

Weight Dry Weight kg 5,600 6,500 Operating weight kg 6,210 7,340

Cabinet Constructed from prepainted hot- dip zinc-aluminum alloy-coated steel．

Notes） *1 Power consumption of Chiller/Heater only.

(Excluding Chilled /Hot water pump and Cooling water pump.) *2 Dimensions in ( ) includes junction box. *3 Dimensions in ( ) includes vent cap. *4 Specifications are subject to change without prior notice. For further information , contact your Yazaki authorized service agent or distributor.

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1.1.2 External Dimensions

CH-MG150

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● CH-MG200

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Vent Cap

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1.1.3 Sound Pressure Levels Measuring point

Sound pressure level characteristics 50/60Hz Commonness

1.1.4 Noise Criteria

CH-MG150

Model Operation sound db (A) CH-MG150 74 CH-MG200 74

Note) Rating operation sound is measured in a place where influence of reflection sound is little.

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CH-MG200

1.1.5 Horizontal Characteristics

Set the machinery’s horizontal to following level. ・ Front and back horizontal:±2/1000 ・ Side and side horizontal: ±2/1000

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1.2 Burner 1.2.1 Burner Specifications

Chiller-Heater Type CH-MG150 CH-MG20012 517 6893456

7

89 11/2inch 2inch

101112

13

Gas Type Natural gasGas Input （kW）Combustion control Proportional (100%-30%）Ignition methodAir control Servor motor（Burner accessory）Gas control Servor motor（Burner accessory）

Intermittent spark

Safety device

Safety device such as Burner controller,Wind pressure switch, Gas pressureswitch would be included in the burner asaccessory.

Flame detection Flame rodPiping sizeGas supply pressure 1.96kPaUsage temperature -20℃～60℃Usage humidity 90%（RH）

CE certificateBurner including the accessories are CEcertificated.

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1.2.2 External Dimension CH-MG150 RS45/M BLU

CH-MG200 RS68/M BLU

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2 Principle & Operating Cycle 2.1 Cycle Diagram 2.1.1 Cooling Cycle

2.1.2 Heating Cycle

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2.2 Component Location

2.2.1 Schematic

　2

　8

　9

2122

28

29

31

　1

　3

　4

　5

　6

　7

10

11

12

1314 15

16

17

18

19

20

23

2425

26

27

30

32

8　7

No Description No Description

1 High Temp. Generator(HGE) 17 Chilled/Hot water Inlet2 Heat Exchanger(HE) 18 Chilled/Hot water Outlet3 Field Wiring Junction Box(JB) 19 Cooling Water Inlet4 Transformer Box(TR) 20 Cooling Water Outlet5 Control Box(CB) 21 Condenser Temp. Sensor(CON)6 Gas Burner(GB) 22 Evaporator Temp. Sensor(LT)7 Changeover Valve(CVR) 23 Cooling Water Inlet Temp. Sensor(CTI)8 Solution Pump(SP) 24 Cooling Water Outlet Temp. Sensor(CTO)9 Refrigerant Proportional Valve(RPV) 25 Generator Temp. Sensor(GP)10 Refrigerant Freeze Protection Valve(SV1) 26 Generator Prevent Switch(GPS)11 Concentrated Solution Proportional Valve(CPV) 27 Chilled/Hot Water Inlet Temp. Sensor(WTI)12 Exhaust Chamber 28 Chilled/Hot Water Flow Switch(FS1)13 Fusible Plug 29 Frames14 Generator Level Switch(GLS) 30 Insulation of HGE & LGE(Glass Wool)15 Palladium Cell(Pd) 31 Insulation of EVA. (Polyethylene Form)16 Gas Supply 32 Chilled/Hot Water Outlet Temp. Sensor(WTO)

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2.2.2 Detail View

Left side view of low temperature part

Right side view of low temperature part

LT Thermistor CON Thermistor

RPV

SV1

SPRefrigerant Sampling Valve

Solution Sampling ValveCVR1

Cooling Water Outlet

Cooling Water Intlet

CON

EVA

HHELHE

Service Valve B

Fusible Plug

Level Bar

RHE

ABS

LGENon-Condensable Gas

Palladium Cell

Gas SeparatorLow temp. concentratedSolution LHE inlet

Concentrated Solution ABS inlet

SP

Service Valve A

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Front side view

Back side view

Non-condensable gasstorage tank(GST)

EVAABSHGE

LGE CONCooling watar outlet

Flow switch

Chilled/hotwater inlet

Chilled/hotwater outlet

CVR1

CVR2

Cooling watar inlet

Palladium cell

CON

ABSEVA

LGE

HGESV1

CPV

Service valveA and B

ControlBox

Level bar

Burner

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HGE front side view HGE side view

Generator Level Switch

Dilute SolutionHGE Inlet

High temp.Concentrated SolutonHGE Outlet

HGESmokeChamber

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Front side view of Water Camber

The water chambers are separated by partitions. Since a short circuit of the cooling water and the chilling water causes capacity reduction, the partitions of the water chambers include rubber packing. The perimeter packing works to avoid water leakage and any trouble with flooding and wasting water. Pay attention to rubber degradation and mounting of packing.

Inside the water chambers are painted with tar epoxy for prevention of rust. This is different from the

black paint used on the other parts of the machine Back side view of Water Camber

ABS tube

ABS partitionrubber packing

ABS perimeterrubber packing

EVA tube

EVA partitionrubber packing

EVA partitionrubber packing

ABS water chamber

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EVA water chamber cover Front side view of CON water chamber and lid Back side view of CON water chamber and lid

EVA cover partition

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2.3 Component Description

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No. Component Description

1 HGE

(High temp generator)

Combustion of fuel boils lithium bromide solution in the

HGE to commence separation of refrigerant from the

absorbent

2 Burner Device for combusting fuel (gas).

3 Smoke Chamber

For leading the exhaust gas to the chimney.

The Heat transfer pipe can be cleaned by removing the

lid.

4

Chimney

For the safe direction of products of combustion for

discharge to atmosphere.

5 Separator Baffle For separating dilute LiBr solution from the refrigerant

vapor.

6 Refrigerant vapor entry To transfer refrigerant vapor into the LGE heat exchange

tube.

7 LGE (low temp generator) To enable secondary boiling of the dilute LiBr solution to

liberate additional refrigerant.

8 LGE separator Secondary separator to remove concentrated LiBr

solution from the lifting secondary refrigerant vapor.

9 Fusible plug A safety device to ensure the hermetic section of the

absorption system cannot be over pressurized.

10 Condenser Heat exchange tube cooled by an external cooling tower

for condensing the secondary refrigerant vapor.

11 Refrigerant liquid

storage vessel

For accumulating refrigerant liquid storage resulting from

the function of RPV.

12 Refrigerant Proportional

Control Valve (RPV)

Electromagnetic proportional valve for control the LiBr

solution concentration and improvement of the stability of

chilled water temperature.

13 Refrigerant service valve Valve used to draw refrigerant samples when necessary.

14 Refrigerant bypass pipe

For leading refrigerant to evaporator which doesn’t empty

into refrigerant liquid storage vessel. If the RPV is closed,

the excess refrigerant held in the refrigerant liquid

storage vessel will be allowed to overflow to the

evaporator.

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15 Liquid refrigerant sump Contains and conveys cooled liquid refrigerant into the

evaporator distribution trays.

16 Tray and dripper Distribute the liquid refrigerant evenly over the

evaporator.

17 Evaporator Provides heat transfer from the internally flowing chilled

water to the externally flowing liquid refrigerant.

18

High temperature

concentrated solution

overflow pipe

Directs the high temperature concentrated LiBr solution

from the HGE to the HHE.

19 High temperature heat

exchanger (HHE)

Facilitates heat exchange between the concentrated LiBr

solution flowing to the LHE and the diluted LiBr solution

flowing from the LHE to the HGE.

20 Vent cap

For discharging exhaust gas outdoor. It‘s structure is

invasion prevention of rain water and no influence of wind

pressure.

21 Weir of heating solution

sump

For accumulating solution in bottom of evaporator that is

unnecessary during heating mode. There is a hole in the

lowest part of the weir and solution doesn’t accumulate

during cooling mode.

22 Concentrated solution return

pipe.

Transfers concentrated LiBr solution from the LGE to the

LHE.

23 Low temperature heat

exchanger (LHE)

Facilitates heat exchange between the concentrated LiBr

solution flowing to the ABS and cool diluted LiBr solution

flowing from the ABS to the HGE.

24 Concentrated solution

supply pipe

Transfers concentrated LiBr solution from LHE to the

absorber.

25 Concentrated proportional

control valve (CPV)

In the event the evaporator temperature falls, CPV valve

will open to allow a proportion of the concentrated LiBr

solution flowing to the ABS to bypass the tube. When the

evaporator temperature increases, CPV will close.

26 Concentrated solution sump Conveys concentrated solution into the absorber

distribution tray.

27 Absorber (ABS) tray

Evenly distributes concentrated solution over the

absorber heat exchange tube.

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28 Absorber (ABS)

Cooling water from the cooling tower flows internally in

the absorber heat exchange tube.

The cooled, concentrated LiBr solution flowing externally

over the tube establishes a vapor pressure under which

liquid refrigerant changes phase in the evaporator.

The resultant refrigerant vapor from the evaporator is

absorbed by the concentrated solution, it thus becomes

diluted before returning to the HGE.

29 Dilute solution sump strainer

The suction intake pipe of the solution pump (SP)

connected to the base of the ABS is provided with a

strainer to preclude particles of any foreign matter

entering the pump.

30 Solution pump

Required to transfer cool, diluted LiBr solution from the

base of the ABS to the heat exchanger and thereafter to

the HGE.

31 Check valve (BV)

A flow non-return valve (BV) is located between the SP

and HGE to accommodate the pressure difference back-

flow potential. And for boil-dry protection of HGE.

32 Dilute solution bypass pipe For leading some dilute solution from LHE outlet to LGE.

33 Solenoid valve (SV1)

If the operation of RPV and CPV does not prevent the

evaporator temperature from declining to 1°C, SV1

solenoid valve will open to allow concentrated LiBr

solution to enter the evaporator liquid refrigerant

reservoir.

34 Ejector inlet pipe For leading dilute solution from SP to ejector.

35 Dilute solution cooling box Cooling the dilute solution led to the ejector by invalid

refrigerant.

36 Ejector

Using pressured cooled dilute solution as a driving fluid to

make lower pressure than ABS to extact non-

condensable gas. It is also extractive in similar principle

during heating.

37 Extraction steam pipe For leading non-condensable gas from ABS to ejector.

38 Gas-liquid return pipe Extracted non-condensable gas at ejector and driving

fluid are mixed and led to gas separator.

39 Gas storage chamber inlet

pipe

Pipe for leading some dilute solution to gas storage

chamber.

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40 Non-condensable gas

storage vessel outlet pipe

Pipe for returning dilute solution from gas storage

chamber


separator

For separating dilute solution from gas-liquid down pipe

and gas.

42

Non-condensable gas

storage vessel ascending

pipe

Pipe for leading non-condensable gas separated at the

separator to gas storage chamber.


storage vessel

For retaining non-condensable gases accumulating in the

absorption circuit.

44 Palladium cell

Hydrogen gas is automatically removed from the

hermetic section of the chiller-heater by the palladium

cell.


service valve

To facilitate the vacuum service procedure to remove

stored non-condensable gases.

46 Solution return pipe Pipe for returning solution from non-condensable gas

separator.

47 Absorber service valve To facilitate the vacuum service of the absorber area of

the absorption circuit.

48 Solution change-over valve

(CVR1)

CVR1 is an electrically operated valve for selecting

heating and cooling modes of operation.

49 Refrigerant evaporation

change-over valve (CVR2)

CVR2 is an electrically operated valve for selecting

heating and cooling modes of operation.

50 HGE pressure sensor (HPS)

HPS is installed at LGE manifold and the LGE tube

pressure is Measured. (LGE≒HGE pressure)

･Protection stop at HGE≧750mmHg

･SP inverter is controlled by HGE pressure at cooling

mode.

51 No USE

No USE

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52 LT thermistor

Safety thermostat for the avoidance of freezing in the

EVA comprising three inputs.

LT1 - If the EVA temperature falls to 1°C or less, SV1 will

be opened to allow concentrated LiBr to enter the

refrigerant liquid reservoir. SV1 will close when the EVA

temperature rises to 2°C or more.

LT2 - If the EVA temperature falls to -2°C or less, the

burner will stop operation. When the EVA temperature

rises to -1°C or more, the burner will recommence

operation.

53 GP thermistor

HGE temperature is measured by installing the protection

tube to HGE smoke pipe.

･Protection stop at GP≧163℃

･Input control starts at GP≧161℃

･Amount of combustion, SP frequency, RPV open angle,

CPV open angle are controlled by HGE temperature.

54 CON thermistor

For measuring condensed refrigerant temperature.

Using for scale warning of cooling water.

*LTD=CON(Temp）-CTO(Temp)

･LTD warning: Warning operation point depends on

input.

･Warning operation point: LTD≧3.4℃(Input35%)

LTD≧6℃(input100%)

Input is proportional to 35～100%

55 WTI thermistor WTI sensor is located in the chilled/hot water circuit inlet

to measure cooling/heating performance.

56 WTO thermistor

WTO sensor is located in the chilled/hot water circuit

outlet to measure cooling/heating performance and for

combustion proportion control.

57 CTI thermistor CTI sensor is located in the cooling water circuit inlet to

control CT fan etc.

58 CTO thermistor CTO sensor is Located in the cooling water circuit outlet

for scale warning.

59 No USE

No USE

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60 GPSC thermostat

(reset button on switch)

HGE protection thermostat -cooling. GPSC thermostat is

a Bimetal type switch located in the HGE panel board.

61 GPSH thermostat

(reset button on switch)

HGE protection thermostat - heating. GPSH thermostat is

a Bimetal type switch located in the HGE panel board.

62 HGE level switch (GLS)

HGE LiBr level switch. This device is a flow switch

located internal to the HGE to monitor the LiBr level. If

the level falls to the predetermined low limit the burner

will be stopped from operating.

63 No USE No USE

64 Flow switch (FS1)

Chilled/hot water flow switch is a paddle type, located in

the chilled/hot water circuit outlet to monitor the flow

volume.

65 No USE No USE.

66 Chilled/hot water inlet pipe To facilitate circulation of the chilled/hot water between

the absorption machine and load.

67 Chilled/hot water outlet pipe To facilitate circulation of the chilled/hot water between

the absorption machine and load.

68 Cooling water inlet pipe To facilitate circulation of cooling water between the

absorption machine and cooling tower.

69 Cooling water outlet pipe To facilitate circulation of cooling water between the

absorption machine and cooling tower.

70 Refrigerant heat exchanger

(RHE)

Facilitates heat exchange between the dilute LiBr solution

flowing to the LGE and the refrigerant vapor flowing from

the LGE to the CON.

71 RHE solution pipe Pipe to lead some of the dilute solution from ABS to RHE.

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2.4 Cool & Heating Cycle

2.4.1 Cooling Cycle (Numbers correspond to 2.3 Component Description)

1. Dilute LiBr solution is pumped to the high temperature generator, HGE (1), and is heated by the direct-fired gas burner (2). As the Lithium Bromide (LiBr) solution temperature is raised, refrigerant vapor is liberated from solution as the refrigerant is brought to the boiling point. As the refrigerant is liberated the solution concentration is raised, some concentrated solution is entrained in the liberated refrigerant and when it comes in contact with the separator baffles (5) the solution drops back into the HGE sump. The refrigerant vapor travels to the low temperature generator (LGE) tubes.

2. The separated high temperature refrigerant vapor flows to LGE (7) tubes and heats

the dilute solution that flows from the low temperature heat exchanger outlet through dilute solution bypass pipe (32). The refrigerant flowing through the LGE tubes generates additional refrigerant vapor out of the dilute solution. The refrigerant vapor in the tubes is condensed as heat is transferred to the dilute solution and the refrigerant liquid flows to the refrigerant heat exchanger RHE (70). Here, the refrigerant liquid is cooled by the heat transfer with dilute solution and then flows to the condenser (10).

3. Refrigerant vapor and low temperature concentrated solution from the LGE (7) are

separated by the LGE baffles(8). Refrigerant vapor enters the condenser, (10) where the heat of condensation is removed by the cooling water flowing through the condenser tubes. Some resultant condensate (refrigerant liquid) mixes with the refrigerant vapor that has been condensed in the condenser and collects in the refrigerant storage vessel (11), flows out to the liquid refrigerant sump (15) through refrigerant bypass pipe (14) and through RPV (12), and then on to the evaporator through the evaporator tray drippers (16). As the refrigerant enters the liquid refrigerant sump (15) through the refrigerant bypass pipe (14), the bypass pipe acts as a metering device, the refrigerants pressure is reduced to that of the evaporator, and as the pressure is lowered some of the refrigerant flashes and cools the remaining refrigerant to evaporator temperature.

4. Since the EVA (17) is at a substantially lower pressure than the condenser, the liquid evaporates as it flows over the surface of the chilled-hot water tubes. The heat of circulating chilled water is removed from refrigerant evaporation, transferred to the refrigerant vapor and the temperature of the chilled water is lowered.

5. In the HGE, the high temperature concentrated solution that was separated out of

the refrigerant vapor stream by the separator baffle (5) flows to the high temperature heat exchanger HHE (19) via high temperature concentrated solution return pipe (18) and is cooled by a heat transfer with the dilute solution flowing through the HHE toward the HGE. The concentrated solution then flows through an orifice and into a mixing box. The mixing box combines this solution and that returning from the concentrated solution return pipe (22) from the LGE before entering the low temperature heat exchanger LHE (23).

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6. Refrigerant is liberated out of the dilute solution in the low temperature generator

LGE (7) by the high temperature refrigerant vapor flowing through the LGE tubes, and as the liberated vapor rises and comes in contact with the LGE separator baffles the solution falls back into the LGE sump and the refrigerant vapor travels to the condenser.

7. The solution after leaving the LGE is mixed with concentrated solution, leaving the

high temperature heat exchanger. As the mixed solution enters the low temperature heat exchanger (23) it is cooled by dilute solution from the absorber (21) before traveling to the concentrated solution sump (26) and then to the absorber dripper trays (27) for equal distribution over the absorber tube bundle.

8. As the equally dripped concentrated solution flows into the absorber it absorbs

refrigerant vapor from the evaporator (17). As the refrigerant vapor is absorbed by the concentrated solution it creates a low pressure area that continuously draws refrigerant vapor from the evaporator. In addition the absorbing of refrigerant vapor causes the solution to give up its heat of vaporization. As the refrigerant vapor is condensed it releases its heat of vaporization. In addition as the refrigerant mixes with the concentrated solution and condenses it also releases a heat of dilution which is transferred to the solution. This heat of dilution and the heat of vaporization are transferred to the cooling water flowing through the absorber tubes. As the refrigerant vapor is absorbed into solution the solution concentration is lowered.

9. The solution pump, SP (30), pumps the dilute solution to LGE. This solution is first

pumped to RHE (70) via solution pipe (71) then to the LGE. Most of the dilute solution is divided into two after flowing through LHE (23). 50% flows to the HGE (1) via HHE (19), 35% flows to LGE via dilute solution bypass pipe (32), and 15% flows to the RHE via RHE solution pipe (71).

10. When the solution returns to the HGE (1), the dilute solution is again heated by the

gas burner and the cycle is repeated from 1～9. The concentrated density of solution of HGE (1) and LGE (7) are nearly equal.

2.4.2 Heating Cycle (Numbers correspond to 2.3 Component Description) 1. Dilute LiBr solution is heated in the HGE by the gas burner in precisely the same

manner as the cooling cycle. Hot vapor flows to the evaporator via refrigerant vapor change-over valve CVR2 (49) and the concentrated solution flows to the lower part of the ABS (28) via solution change-over valve CVR1(48).

2. Hot refrigerant vapor flows to the evaporator (17) and condenses on the surface of

the evaporator tubes. The heat of condensation is transferred from the circulating hot water, and as heat is transferred the water temperature is raised.

3. Hot refrigerant vapor which is condensed on the surface of the evaporator tubes is

condensed and mixes with the concentrated solution. As the refrigerant is absorbed into solution the solution concentration lowers. The SP(30) pumps the dilute solution

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through the LHE (23).The dilute solution is divided into two after flowing through the LHE(23) . One half returns to the lower part of the ABS(28) again via dilute solution bypass pipe(32), LGE (7), concentrated solution return pipe (22), LHE(23) and CPV (25). The other half returns to HGE (1) via HHE (20).

4. Dilute solution which returned to HGE (1) is again heated by the gas burner (2 ) and

the cycle is repeated from 1～3. 2.5 MG Series Part Temperature Data (Representative) In Cooling Operation Input 100% 100% 80% 60% 44%

Cooling water temp ℃ 32 29.5 31 30 29.0

Dilute solution

SP outlet temp ℃ 37 35 35 34 32

LHE outlet temp ℃ 75 73 73 71 68

HGE inlet temp ℃ 133 131 129 125 119

RHE outlet temp ℃ 72 69 66 60 56

High temp concentrated solution

HGE outlet temp ℃ 155 153 148 141 132

HHE outlet temp ℃ 80 79 78 76 72

Low temp concentrated solution LGE outlet temp ℃ 89 87 85 80 75

Concentrated solution ABS inlet temp ℃ 42 41 41 40 37

Liquid refrigerant RHE inlet temp ℃ 92 89 87 83 77

RHE outlet temp ℃ 60 61 58 57 54

Evaporator temperature ℃ 6.9 6.7 6.6 4.5 4.1

Condenser temperature ℃ 40 38 38 35 33

High temp generator temperature ℃ 158 155 151 143 135

Exhaust gas temperature ℃ 198 195 179 160 143

High temp generator pressure kPa 87 84 73 61 49

※ Table above is Representative data of MG150. Value will change by refrigeration capacity,

amount of cooling water circulation, level of adhesion of scale and slime, and vacuum level, therefore use only as reference value.

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2.6 Equilibrium Chart

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