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TRG-TRC011-EN 19
period two
Absorption Chiller Types
notes
Single-Effect Chiller
The single-effect absorption 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
15 psig [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.
condenser
condenser
generator
generator
evaporator
evaporator
absorber
absorber
Figure 22