period two
Absorption Chiller Types
notes
| low-temperature | high-temperature |
| generator |
| generator |
| |
| condenser | |
| evaporator | |
| absorber | |
Figure 24
Double-Effect Chiller
The double-effect absorption chiller includes the same basic components as the single-effect chiller; however, it also includes an additional generator, heat exchanger, and pump.
The high-temperature generator can use steam or hot water (indirect-fired) as the energy source, or it can use the combustion of a fuel such as natural gas or oil (direct-fired). First we will discuss an indirect-fired, double-effect absorption chiller. The direct-fired chiller will be discussed later.
Indirect-fired, double-effect absorption chillers are typically operated on medium-pressure steam (approximately 115 psig [894.3 kPa]) or high- temperature liquids (approximately 370°F [187.8 °C]). Typical COPs for these chillers are 0.9 to 1.2.
