Trane TRG-TRC011-EN manual Single-Effect Chiller

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period two

Absorption Chiller Types

notes

condenser	generator
	generator
evaporator

absorber

Figure 22

Single-Effect Chiller

The single-effectabsorption water chiller uses a cycle similar to the one presented in Period One. It includes a single generator, condenser, evaporator, absorber, heat exchanger, and pumps.

These chillers are typically operated on low-pressure steam (approximately

15psig [204.8 kPa]) or medium-temperature liquids (approximately 270°F [132.2°C]). Typical coefficients of performance for single-effect water chillers are 0.6 to 0.8. The coefficient of performance (COP) is a dimensionless ratio used to express the efficiency of a refrigeration machine. For an absorption water chiller, COP is defined as the ratio of evaporator cooling capacity divided by the heat energy required by the generator. A higher COP designates a higher efficiency.

Notice that the COP used to express the efficiency of absorption water chillers excludes the electrical energy needed to operate the pumps, purge, and controls.

TRG-TRC011-EN

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Contents Air Conditioning Clinic Absorption Water Chillers Absorption Water Chillers Preface Contents TRG-TRC004-EN Introduction TRG-TRC011-EN Absorption Refrigeration Cycle Period onePeriod one Reject heat Heat energy Absorption System Fluids High affinity for water refrigerant Components of the Absorption Cycle Conditions Steam or Hot waterrefrigerant vapor Generator Condenser Refrigerant then flows into the evaporator pan Absorber spray pump Solution Heat Exchanger Dilute Generator pump Equilibrium Chart Heat Solution temperature Absorption Chiller Types Period twoSingle-Effect Chiller Absorber Evaporator spray pump Spray pump Generator pump Double-Effect Chiller Vapor Low Temperature condenser Cooling Generator Water Evaporator Absorber Low-temperature generator pump Generator pump Absorption Chiller Types Direct-Fired Chiller Evaporator High-temperature high-temperature Generatorgenerator pump Chiller/Heater Absorption Chiller Types Changeover Absorption Chiller Types Capacity Control Period threePeriod three Energy valve Generator Crystallization 10C 37.8C Capacity Control Capacity Control Capacity Control Heat exchanger bypass Evaporator pan Purge System Isolation valve Maintenance Considerations Period fourPeriod four Maintenance Considerations Test run with alternate fuel, if dual-fuel burner Maintenance Considerations Maintenance Considerations Corrosion inhibitor and performance additive recommendations Application Considerations Period fiveCooling-Water Temperature Limitations Combination Chiller Plants 58F Special Considerations for Direct-Fired Chillers Application Considerations Equipment Rating Standards Review Period sixPeriod six Review Review Review Quiz Questions for PeriodQuiz TRG-TRC011-EN Answers Glossary Glossary Glossary Trane Company