DOUBLE EFFECT ABSORPTION CHILLER /HEATER MG MODEL 1

DOUBLE EFFECT ABSORPTION CHILLER /HEATER MG MODEL 1 Specifications CH-MG150CE CH-MG200CE Version 9.10

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 27-1 -

ITEM Capacity Chilled/Hot Water Cooling Water Fuel Electrical Control Combustion Dimension Piping Weight Cabinet 1. General Information 1.1 Chiller-heater 1.1.1Chiller-heater Specifications MODEL CH-MG150 CH-MG200 Cooling kw 527 703 Heating kw 429 572 Chilled Water Inlet 12.0 Temperature Outlet 7.0 Hot Water Inlet 56.0 Temperature 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 Heat Rejection kw 892 1,190 Cooling Inlet 29.5 Water Temperature 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 Type of Fuel Natural Gas Consumption Cooling kw 440 586 Heating kw 517 689 Power Source 400V 50Hz 3ph.+ Neutral Capacity *1 kva 3.10 3.40 Cooling 35%-100% Proportional Control Heating 30%-100% Proportional Control Burner Forced Draft (Proportion Controlled) Flame Detector Flame Rod Ignition Intermittent Spark 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) Chilled/Hot Water mm 100A 125A Cooling Water mm 125A 150A Gas Supply mm 40A 50A Dry Weight kg 5,600 6,500 Operating weight kg 6,210 7,340 Constructed from prepainted hot- dip zincaluminum 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. - 2 -

1.1.2 External Dimensions CH-MG150-3 -

CH-MG200-4 -

Vent Cap - 5 -

1.1.3 Sound Pressure Levels Measuring point Note) Rating operation sound is measured in a place where influence of reflection sound is little. Sound pressure level characteristics Model Operation sound db (A) CH-MG150 74 CH-MG200 74 50/60Hz Commonness 1.1.4 Noise Criteria CH-MG150-6 -

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: ±2/1000-7 -

1.2 Burner 1.2.1 Burner Specifications Chiller-Heater Type CH-MG150 CH-MG200 1 Gas Type Natural gas 2 Gas Input (kw) 517 689 3 Combustion control Proportional (100%-30%) 4 Ignition method 5 Air control Intermittent spark Servor motor(burner accessory) 6 Gas control Servor motor(burner accessory) Safety device such as Burner controller, 7 Safety device Wind pressure switch, Gas pressure switch would be included in the burner as accessory. 8 Flame detection Flame rod 9 Piping size 11/2inch 2inch 10 Gas supply pressure 1.96kPa 11 Usage temperature -20 ~60 12 Usage humidity 90%(RH) 13 CE certificate Burner including the accessories are CE certificated. - 8 -

1.2.2 External Dimension CH-MG150 RS45/M BLU CH-MG200 RS68/M BLU - 9 -

2 Principle & Operating Cycle 2.1 Cycle Diagram 2.1.1 Cooling Cycle 2.1.2 Heating Cycle - 10 -

2.2 Component Location 2.2.1 Schematic 22 21 28 31 29 8 13 30 2 1 9 14 25 7 15 24 20 10 5 32 12 6 26 4 18 27 17 11 23 19 8 7 16 3 No Description No Description 1 High Temp. Generator(HGE) 17 Chilled/Hot water Inlet 2 Heat Exchanger(HE) 18 Chilled/Hot water Outlet 3 Field Wiring Junction Box(JB) 19 Cooling Water Inlet 4 Transformer Box(TR) 20 Cooling Water Outlet 5 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 Frames 14 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) - 11 -

2.2.2 Detail View Left side view of low temperature part Cooling Water Outlet LT Thermistor CON Thermistor CON SV1 EVA RPV LHE HHE Cooling Water Intlet CVR1 SP Refrigerant Sampling Valve Solution Sampling Valve Right side view of low temperature part Fusible Plug Service Valve A RHE Service Valve B LGE Non-Condensable Gas Palladium Cell Level Bar ABS SP Concentrated Solution ABS inlet Low temp. concentrated Solution LHE inlet Gas Separator - 12 -

Front side view Service valve A and B CON LGE Control Box SV1 EVA ABS HGE Level bar Burner CPV Back side view Palladium cell CVR2 LGE CON Cooling watar outlet Non-condensable gas storage tank(gst) HGE ABS EVA Flow switch Chilled/hot water outlet Cooling watar inlet Chilled/hot water inlet CVR1-13 -

HGE front side view Generator Level Switch Dilute Solution HGE Inlet High temp. Concentrated Soluton HGE Outlet HGE Smoke Chamber HGE side view - 14 -

Front side view of Water Camber EVA tube EVA partition rubber packing EVA partition rubber packing ABS tube ABS partition rubber packing ABS perimeter rubber packing 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 water chamber - 15 -

EVA water chamber cover EVA cover partition Front side view of CON water chamber and lid Back side view of CON water chamber and lid - 16 -

2.3 Component Description - 17 -

No. Component Description 1 Combustion of fuel boils lithium bromide solution in the HGE HGE to commence separation of refrigerant from the (High temp generator) 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 For the safe direction of products of combustion for Chimney 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 For accumulating refrigerant liquid storage resulting from storage vessel the function of RPV. 12 Electromagnetic proportional valve for control the LiBr Refrigerant Proportional solution concentration and improvement of the stability of Control Valve (RPV) 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. - 18 -

No. Component Description 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 Directs the high temperature concentrated LiBr solution concentrated solution from the HGE to the HHE. overflow pipe 19 Facilitates heat exchange between the concentrated LiBr High temperature heat solution flowing to the LHE and the diluted LiBr solution exchanger (HHE) 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. For accumulating solution in bottom of evaporator that is 21 Weir of heating solution unnecessary during heating mode. There is a hole in the sump lowest part of the weir and solution doesn t accumulate during cooling mode. 22 Concentrated solution return Transfers concentrated LiBr solution from the LGE to the pipe. LHE. 23 Facilitates heat exchange between the concentrated LiBr Low temperature heat solution flowing to the ABS and cool diluted LiBr solution exchanger (LHE) flowing from the ABS to the HGE. 24 Concentrated solution Transfers concentrated LiBr solution from LHE to the supply pipe absorber. In the event the evaporator temperature falls, CPV valve 25 Concentrated proportional will open to allow a proportion of the concentrated LiBr control valve (CPV) 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. - 19 -

No. Component Description 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 backflow 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 noncondensable 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 for leading some dilute solution to gas storage pipe chamber. - 20 -

No. Component Description Pipe for returning dilute solution from gas storage Non-condensable gas 40 chamber storage vessel outlet pipe 41 42 43 Non-condensable gas separator Non-condensable gas storage vessel ascending pipe Non-condensable gas storage vessel For separating dilute solution from gas-liquid down pipe and gas. Pipe for leading non-condensable gas separated at the separator to gas storage chamber. 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. 45 Non-condensable gas service valve 46 Solution return pipe 47 Absorber service valve 48 Solution change-over valve (CVR1) To facilitate the vacuum service procedure to remove stored non-condensable gases. Pipe for returning solution from non-condensable gas separator. To facilitate the vacuum service of the absorber area of the absorption circuit. 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 - 21 -

No. Component Description 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 57 CTI thermistor 58 CTO thermistor WTO sensor is located in the chilled/hot water circuit outlet to measure cooling/heating performance and for combustion proportion control. CTI sensor is located in the cooling water circuit inlet to control CT fan etc. CTO sensor is Located in the cooling water circuit outlet for scale warning. 59 No USE No USE - 22 -

No. Component Description 60 GPSC thermostat HGE protection thermostat -cooling. GPSC thermostat is (reset button on switch) a Bimetal type switch located in the HGE panel board. 61 GPSH thermostat HGE protection thermostat - heating. GPSH thermostat is (reset button on switch) 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 Facilitates heat exchange between the dilute LiBr solution Refrigerant heat exchanger flowing to the LGE and the refrigerant vapor flowing from (RHE) the LGE to the CON. 71 RHE solution pipe Pipe to lead some of the dilute solution from ABS to RHE. - 23 -

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). - 24 -

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 - 25 -

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 SP outlet temp 37 35 35 34 32 Dilute solution LHE outlet temp 75 73 73 71 68 HGE inlet temp 133 131 129 125 119 High temp concentrated solution RHE outlet temp 72 69 66 60 56 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. - 26 -

2.6 Equilibrium Chart - 27 -