Heat Exchanger Solution Gas Burner Pump

Double Effect Absorption Cycle (Heating)

Fig. 38-14 Comparison of Absorption Cooling and Heating Cycles. Source: Adapted from American Yazaki Corp. and The American Gas Cooling Center

0.04 kW/ton (0.002 to 0.008 kWe/kWr), with a minimum of 0.004 kW/ton for some smaller machines. Heat rejection at typical rates of about 22,000 Btu/ton-h (1.83 kWhh/kWhr) may be achieved, with condenser water flow rates ranging from 3.0 to 4.5 gpm/ton (3.2 to 4.8 lpm/kWr).

Absorption Chiller/Heaters

Absorption machines designed to provide both cooling and heating service are referred to as chiller/heaters. An advantage of the chiller/heater design is that it can either eliminate or reduce the requirement for a separate boiler, thus reducing capital cost and space requirements. Figure 38-14 provides an illustrative comparison of absorption cooling and heating cycles. The absorption heating cycle is illustrated in Figure 38-15 and described as follows:

1. Heating is enabled by opening a valve that allows hot refrigerant vapor to bypass the condenser and flow directly to the evaporator (or alternative auxiliary heat exchanger).

2. Condensing refrigerant heats the system water flow-

Exhaust Gas to

Vapor/Solution Stack eparator

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