period two
Absorption Chiller Types
notes
condenser | 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.
