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Title: Thermodynamic analysis of absorption chillers: Internal dissipation and process average temperature
Authors: Ng, K.C. 
Tu, K.
Chua, H.T. 
Gordon, J.M.
Kashiwagi, T.
Akisawa, A.
Saha, B.B.
Keywords: Absorption chiller
Ammonia-water binary mixture
Process average temperature
Thermodynamic modeling
Issue Date: 1998
Citation: Ng, K.C.,Tu, K.,Chua, H.T.,Gordon, J.M.,Kashiwagi, T.,Akisawa, A.,Saha, B.B. (1998). Thermodynamic analysis of absorption chillers: Internal dissipation and process average temperature. Applied Thermal Engineering 18 (8) : 671-682. ScholarBank@NUS Repository.
Abstract: Absorption chillers operate well below their reversible or endoreversible limits because their thermodynamic behavior is dominated by internal dissipation, a significant part of which occurs in the chiller's heat exchangers. This fact has summarily been omitted from earlier analyses. It translates into incorrect values for the refrigerant process-average temperature (PAT), and leads to noticeable errors in chiller diagnostics and optimization. Using experimental measurements from an absorption chiller, in concert with a computer simulation code and an analytic thermodynamic model, we fortify these claims with quantitative examples. The correct PAT is derived and its significance in chiller analysis is high-lighted. Aspects of chiller optimization that are unique to absorption technology, as opposed to conventional vapor-cycle reciprocating chillers, are also illustrated. We also substantiate that commercial absorption chiller technology has empirically evolved to close to optimal operating conditions. © 1998 Elsevier Science Ltd. All rights reserved.
Source Title: Applied Thermal Engineering
ISSN: 13594311
Appears in Collections:Staff Publications

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