Simulation of the compressor-assisted triple-effect H2O/LiBr absorption cooling cycles

The construction of a triple-effect absorption cooling machine using the lithium bromide-based working fluid is strongly limited by the corrosion problem caused by the high generator temperature. In this study four compressor-assisted H2O/LiBr cooling cycles were suggested to solve the problem by lowering the generator temperature of the basic theoretical triple-effect cycle. Each cycle includes one compressor at a different state point to elevate the pressure of the refrigerant vapor up to a useful condensation temperature. Cycle simulations were carried out to investigate both a basic triple-effect cycle and four compressor-assisted cycles. All types of compressor-assisted cycles were found to be operable with a significantly lowered generator temperature. The temperature decrements increase with elevated compression ratios. This means that, if a part of energy input is changed from heat to mechanical energy, the machine can be operated in a favorable region of generator temperature not to cause corrosion problems. In order to obtain 40 K of generator temperature decrement (from 475.95 K) for all cycles, 3-5% of cooling capacity equivalent mechanical energies were required for operating the compressor. A great advantage of the investigated triple-effect cycles is that the conventionally used H2O/LiBr solution can be used as a working fluid without the danger of corrosion or without integrating multiple solution circuits. (C) 2002 Elsevier Science Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2002-02
Language
ENG
Citation

APPLIED THERMAL ENGINEERING, v.22, no.3, pp.295 - 308

ISSN
1359-4311
DOI
10.1016/S1359-4311(01)00084-9
URI
http://hdl.handle.net/10203/8932
Appears in Collection
CBE-Journal Papers(저널논문)
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