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Thermodynamic analysis of optimal condensing+ H5 g1 P8 x0 h- ?1 f
temperature of cascade-condenser in CO2/NH3
# D4 t- A! \% a1 xcascade refrigeration systems! S) p0 V8 `3 T4 O- ^# s6 s ]
Tzong-Shing Lee*,1
* N5 P6 I, H& G, Cheng-Hao Liu, Tung-Wei Chen: d0 {; v" Q9 l, @/ n
Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,
) H0 G& B" W( }, E/ W0 tNo. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
- J& D" X1 W+ T2 LReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 2006
5 L2 ~1 j( D4 A" o1 DAvailable online 5 June 2006' z" Z& E* m9 n3 L
Abstract
1 ^7 ?( L6 U% ]2 z( ~; E! P1 j6 XThis study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-
: E% \, }' W1 s2 {8 t; vants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize2 I. ^1 ]1 Q, q, B- z
the COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the* s5 t1 n$ `" X
condensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported( V7 l5 {, z/ x2 c
experimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum2 i2 G+ @& i, p
COP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
, ~8 L/ I d# f; p7 Fature of the cascade-condenser and the corresponding maximum COP are presented.
0 L3 F& x3 k8 Q2 b 2006 Elsevier Ltd and IIR. All rights reserved.7 ]$ h# y# s% N: J6 z
Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-9 U0 t0 ^- M. ~
tion; COP |
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发表于 2009-9-6 11:19:10
