W E A R E F R I E N D L Y T O T H E E A R T H

Gas-Fired Double-Effect Chiller-HeaterCH-K Series: 30, 40, 50, 60, 80, 100 RT Cooling with Standard Heating Capacities

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Yazaki gas-fired DOUBLE-EFFECT chiller-heaters, with cooling capacities of 30 to 100 tons of refrigeration, are designed for commercial applications where chilled and hot waterare used in a central air conditioning system. The condenser is water-cooled and, during thecooling operation, heat is rejected through a cooling tower or ground loop.

The Yazaki absorption chiller-heater uses a solution of lithium bromide and water, under a very low pressure, as the working fluid. Water is the refrigerant and lithium bromide is the absorbent. The double-effect absorption cycle has two generators - one directly heated by agas burner and the other heated by hot refrigerant vapor. Refrigerant, liberated by heat from the solution, produces a refrigerating effect in the evaporator when cooling water is circulated through the condenser and absorber.

High Temperature Generator

Low Temperature Generator

Condenser

The gas burner heats a dilute lithium bromide solution in the high temperature generatorand the boiling process drives the refrigerant vapor and droplets of semi-concentrated solution up into the primary separator. The semi-concentrated solution is pre-cooledthrough a heat exchanger before flowing into the low temperature generator.

Hot refrigerant vapor from the primary separator heats the semi-concentrated solution in the low temperature generator. Refrigerant vapor, liberated from this solution, flows to the condenser while concentrated solution is pre-cooled through a heat exchanger before flowing into the absorber.

In the condenser section, refrigerant vapor is condensed on the surface of the condensercoil and latent heat removed by the cooling water is rejected to a cooling tower orground loop. Refrigerant liquid accumulates in the condenser and then passes throughan orifice into the evaporator.

Gas-FiredDouble-EffectChiller-Heater(For Commercial Applications)

Absorption Principle

Cooling Cycle

Dilute Solution

Semi-concentrated Solution

Concentrated Solution

Refrigerant Vapor

Refrigerant Liquid

Cooling Water

Chilled Water

CONDENSER

ORIFICE

Chilled Water

Cooling Water

SECONDARYSEPARATOR

Refrigerant Vapor

LOW TEMPGENERATOR

PRIMARYSEPARATOR

LIFT PIPE

HIGH TEMPGENERATOR

COOLING/HEATING

CHANGEOVERVALVE

EVAPORATOR

ABSORBER

SOLUTIONPUMP

HEAT EXCHANGERSGAS BURNER

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EvaporatorPressure in the evaporator is substantially lower than the pressure in the condenser dueto the influence of the absorber. As the refrigerant liquid flows into the evaporator it boils on the surface of the chilled/hot water coil. Heat, equivalent to the latent heat of the refrigerant, is removed from the recirculating water which is chilled to 44.6˚F atstandard set-point. The refrigerant vapor flows to the absorber.

AbsorberA low pressure in the absorber is maintained by the affinity of the concentrated lithiumbromide solution from the separator with the refrigerant vapor formed in the evaporator. The refrigerant vapor is absorbed by the concentrated lithium bromide solution as it flows across the surface of the absorber coil. Heat of condensation and dilution are removed by the cooling water. The dilute lithium bromide solution is pre-heated through the heat exchangers before returning to the generator.

High Temperature GeneratorThe solution boils in the high temperature generator and vapor with concentrated lithium bromide solution is lifted to the separator in a manner identical to the cooling cycle.

EvaporatorHot refrigerant vapor and droplets of concentrated solution flow through an open cooling/heating changeover valve into the evaporator/absorber section. Some refrigerant vapor flows into the evaporator/absorber section via the condenser. Since the pressures in the evaporator and condenser are similar and there is no cooling water flow, hot refrigerant vapor condenses on the surface of the chilled/hot water coil. Heat, equivalent to the latent heat of the refrigerant is transferred to the recirculating water which is heated to 131˚F at standard set-point.

AbsorberLiquid refrigerant drips off the chilled/hot water coil and mixes with concentrated lithium bromide solution in the sump of the absorber to form dilute solution and is returned to the high temperature generator where the cycle is repeated.

Heating Cycle

Dilute Solution

Concentrated Solution

Refrigerant Vapor

Refrigerant Liquid

Hot Water

Refrigerant Vapor

CONDENSER

ORIFICE

Hot Water

SOLUTIONPUMP

LIFT PIPE

COOLING/HEATING

CHANGEOVERVALVE

EVAPORATOR

ABSORBER

GAS BURNER HEAT EXCHANGERS

PRIMARYSEPARATOR

HIGH TEMPGENERATOR

Stage Up to High Fire

Stage Up to Low Fire

Stage Down to Low Fire

Stage O�

40.1 41.9 43.7 45.5 47.3 49.1 50.9 52.7 54.5 °F4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 .12.5 °C

100%

70%

0%

Burn

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COOLING

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Each modular chiller-heater unit serves a dual purpose: Cooling and heating.Cabinets are weatherproof and suitable for indoor or outdoor installation.Each unit is shipped fully assembled with a hermetically sealed vacuum section, test run and charged at the factory prior to shipment.Safe, odorless, non-toxic lithium bromide and water are the only working fluids and operate under a vacuum at all times. The need for regular chemical analysis is eliminated.Cooling or heating operation can be selected from a remote or built-in switch with a 30-minute changeover.Transportation and lifting are simplified because of modular construction.A two pipe hydronic system can be used to circulate chilled or hot water to a central air handling unit or multiple fan-coil units.The DOUBLE-EFFECT absorption cycle and forced-draft gas burner reduce fuel consumption by up to 40% compared with single-effect absorption units. This means less heat is rejected to the cooling tower, reducing its size and energy usage.As a Category I appliance, atmospheric vent pressure allows for use of inexpensive type-B vent materials.UL listed in the USA and Canada. Shutdown controls for abnormal cooling water conditions are included.All field piping and wiring connections are conveniently located on the rear of each module.Built-in control panel with microprocessor control simplifies installation and maintenance.Optional remote monitoring system is available.

Features

Performance Characteristics

Low Fire Sequence of Operation:When LCWT reaches 45.5°F, the burner will fire at Low Fire. If the LCWT temperature continues to rise, the burner will stage up to High Fire at 50.9°F. Otherwise, the burner will shut down when LCWT reaches 41.9°F.

High Fire Sequence of Operation:When LCWT reaches 50.9°F (note 1 - adjustable to 47.3˚F), the burner stages up to High Fire. It will continue to burn in High Fire until LCWT reaches 43.7°F at which time the burner will drop back into Low Fire and follow the Low Fire Sequence of Operation.

Leaving Chilled Water Temperature (LCWT)

Stage Up to High Fire

Stage Up to Low Fire

Stage Down to Low Fire

Stage O�

124.7 126.5 128.3 130.1 131.9 133.7 135.5 137.3 139.1 °F

51.5 52.5 53.5 54.5 55.5 56.5 57.5 58.5 59.5 °C

100%

70%

0%

Leaving Heated Water Temperature (LHWT)

Burn

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HEATING

Low Fire Sequence of Operation:When LHWT reaches 130.1°F, the burner will fire at Low Fire. If the LHWT temperature continues to fall,the burner will stage up to High Fire at 124.7°F. Otherwise, the burner will shut down when LHWT reaches 133.7°F.

High Fire Sequence of Operation:When LHWT reaches 124.7°F (note 2 - adjustable to 128.3˚F), the burner stages up to High Fire. It will continue to burn in High Fire until LHWT reaches 131.9°F at which time the burner will drop back into Low Fire and follow the Low Fire Sequence of Operation.

---- Standard Design Set Point. This is the temperature that will be held when load exactly equals rated capacity. Cooling Set Point can be adjusted 1.8˚F down or ......16.2˚F up from standard design set point. Heating Set Point can be adjusted 12.6˚F down or 5.4˚F up from standard design set point.

GAS

COOLAIR

FAN-COIL UNIT

COOLING TOWER

Dilute Solution

Semi-concentrated Solution

Concentrated Solution

Refrigerant Vapor

Refrigerant Liquid

Cooling Water

Chilled Water

Application (Gas-Fired Cooling & Heating System - Cooling Operation)

Specifications

GAS-FIRED DOUBLE-EFFECT CHILLER-HEATER

NOTES:

1. Fuel input is based on HIGHERHEATING VALUE of gas.

2. Specifications are based onwater in all circuits and foulingfactor of 0.0005 ft2hr ˚F/Btu.

3. Two or more modules maybe installed in parallel for larger capacities.

4. D o n o t e x c e e d 8 5 . 3 p s i operating pressure in any water circuit.

5. Standard burner control is High(100%)-Low (70%)-Off.

6. The minimum natural gas supplypressure is 5.0 in. wc (7.0 in. wc forCH-K100).

7. The maximum natural gas supplypressure is 10.5 in. wc.

8. The minimum propane gas supply pressure is 11.0 in. wc.

9. The maximum propane gas supply pressure is 13.0 in. wc.

* Minimum cooling water flow

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40.3

Dimensions (CH-K Series)

CH-K30 & CH-K40

CH-K50 & CH-K60

CH-K80 & CH-K100

6 All Dimensions In Inches

40.4

7

EXPANDED COOLING PERFORMANCE DATA

TEMPERATURE (OF)CoolingWaterInlet

ChilledWaterOutlet

80

85

90

COOLING CAPACITY & HEAT REJECTION (Btu/hr x 103)CH-K60 CH-K80 CH-K100

CoolingCapacity

HeatRejection

CoolingCapacity

HeatRejection

CoolingCapacity

HeatRejection

41.0 650.0 1236.0 879.3 1660.3 1124.1 2100.242.8 698.8 1284.8 927.7 1708.7 1191.4 2166.544.6 742.0 1328.0 988.4 1769.4 1230.1 2206.246.4 749.2 1335.2 998.3 1779.3 1245.2 2221.348.2 753.9 1339.9 1000.8 1781.8 1247.5 2223.641.0 605.9 1191.9 804.3 1585.3 1024.9 2001.042.8 667.8 1253.8 892.8 1673.8 1122.9 2099.044.6 720.0 1305.0 960.0 1741.0 1200.0 2176.046.4 727.3 1313.3 980.9 1761.9 1221.0 2197.148.2 738.4 1324.4 988.0 1769.0 1225.3 2201.441.0 542.2 1131.2 723.8 1504.8 922.2 1898.342.8 600.8 1186.8 803.5 1584.5 1010.6 1986.744.6 648.0 1234.0 863.8 1644.8 1079.7 2055.846.4 669.0 1255.0 902.3 1683.3 1123.3 2099.448.2 694.0 1280.0 928.5 1709.5 1151.9 2128.0

TEMPERATURE (OF)CoolingWaterInlet

ChilledWaterOutlet

80

85

90

COOLING CAPACITY & HEAT REJECTION (Btu/hr x 103)CH-K30 CH-K40 CH-K50

CoolingCapacity

HeatRejection

CoolingCapacity

HeatRejection

CoolingCapacity

HeatRejection

41.0 353.2 646.2 472.2 863.1 587.3 1075.342.8 365.1 658.1 485.7 876.6 603.1 1091.144.6 372.2 665.2 495.2 886.1 616.6 1104.646.4 374.6 667.6 498.4 889.3 620.6 1108.648.2 374.6 667.6 498.4 889.3 623.0 1111.041.0 327.0 620.0 438.9 829.8 539.6 1027.642.8 349.2 642.2 462.7 853.6 578.5 1066.544.6 360.0 653.0 480.0 870.0 600.0 1088.046.4 369.0 662.0 484.1 875.0 610.3 1098.348.2 369.0 662.0 484.1 875.0 613.5 1101.541.0 294.4 587.4 394.8 785.7 485.7 973.742.8 314.3 607.3 416.2 807.1 520.6 1008.644.6 323.8 616.8 431.7 822.6 540.0 1028.046.4 339.3 632.3 445.2 836.1 561.5 1049.548.2 346.8 639.8 455.1 846.0 576.6 1064.6

The chiller-heater cooling performance is based on the following conditions:

1. High-fire burner operation.2. Standard flow rates of cooling water and chilled water.3. Water used in all circuits.4. Fouling factor of 0.0005 ft2hr oF/Btu in the condenser/absorber and evaporator.

Standard Rated Performance

Chiller-Heater Installation Examples

YAZAKI ENERGY SYSTEMS, INC.701 East Plano Parkway, Suite 305

Plano, TX 75074Telephone (469) 229 5443Facsimile (469) 229 5448

http://www.yazakienergy.com

Outdoor ApplicationCity Hall

Southern California Gas Energy Resource CenterIndoor Application

YAZAKI DISTRIBUTOR OR SALES AGENT

Yazaki reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations.

S-DEKUL-0910