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Thermodynamic analysis of optimal condensing2 _# U/ w) C) j, K5 {
temperature of cascade-condenser in CO2/NH3' \& K: D' M# b+ ?+ F9 v
cascade refrigeration systems. Y/ {/ f2 t; k% q6 m5 T
Tzong-Shing Lee*,1' N) i1 w+ O- Z4 P& X# t) s
, Cheng-Hao Liu, Tung-Wei Chen4 J5 ?" |* [$ F- O+ d
Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,
[7 K$ Z; v$ g {( G' E6 aNo. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
8 H1 n4 _3 T t7 f4 k$ ^3 J7 B- c9 G: iReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 20066 d7 R0 D9 O2 Q+ X& y, y' M4 k
Available online 5 June 20064 M4 f1 D' N. d, C+ ]
Abstract
, q# }" H- {9 B" x! X" J: p# ?This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-
. E) J9 S3 |7 f ~ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize
7 Y8 q0 Z3 D, W: V c9 {4 Ithe COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the
7 [; {% i% h: x7 ~$ \7 a) a* U- `condensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported
4 C7 |& }+ z" x( Dexperimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum
4 N. w8 u* t+ C- `COP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
6 e/ x) g( ~- z4 T) Vature of the cascade-condenser and the corresponding maximum COP are presented.5 ?( F$ G/ N- A2 s/ Z8 a6 K
2006 Elsevier Ltd and IIR. All rights reserved.
" u3 ?2 D# `! W; g; gKeywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-' }/ X" Y9 @! E" _
tion; COP |
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发表于 2009-9-6 11:19:10
