APC 400kW1MW User Manual download pdf (Page 38)

Figure 4-4 Single-Effect Absorption Chiller Cooling Process [I]

Absorption chillers are classified by the number of generators they have. There are

single, double, and triple-effect absorption chillers. However, triple-effect absorption chillers are

still under development. The selection of an absorption chiller configuration is determined by

the waste heat temperature. The waste heat temperature must be high enough to generate

refrigerant vapor in the absorption cooling cycle [49, p.1; 20, p. 7-18].

Waste heat in the form of steam or hot water can be supplied to an absorption chiller. A

single-effect absorption chiller requires high temperature hot water near or above the boiling

point (under pressure). Approximately 17,000 Btuh of high temperature hot water or low

pressure steam serving a single-effect absorption chiller is able to produce one ton, or 12,000

Btuh, of cooling. Double-effect absorption chillers require 10,000 Btuh of steam in order to

produce one ton of cooling [50, p.1; 1, p. 81].

Fuel cells that produce waste heat capable of producing hot water or steam to be used

with either single or double-effect absorption chillers include the SOFC and the MCFC. If the

high temperature heat recovery option is selected, UTC Power’s Purecell Model 400 can

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APC 400kW1MW User Manual Page 38