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Thermodynamic analysis of optimal condensing
, U h$ l# I; A. b4 ]/ X0 @, Atemperature of cascade-condenser in CO2/NH3
# ]8 b6 ^6 |* A2 E; Fcascade refrigeration systems
$ [5 R2 S/ ~% ?0 c! OTzong-Shing Lee*,1 D8 j# k( R' P7 P. q
, Cheng-Hao Liu, Tung-Wei Chen- p( {7 a% {9 P# n1 W
Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,
3 w; f/ C1 Z7 h9 G hNo. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
0 T* @# h" W% B7 X' EReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 2006
/ H4 x; U, J# q; s* P4 FAvailable online 5 June 2006
( x4 }. r; T, j7 p: g% D8 ZAbstract4 d5 R F& ?8 Q4 n& A
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-; @5 g+ U h4 X- K! p4 p2 s
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize. O& ]/ ~8 v- G
the COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the
$ t$ R, F# f, @, y1 g1 u3 {# U! Zcondensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported
* D% v4 {3 R+ P- L- {4 aexperimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum5 ]* {) Z" q1 v5 ~- q: H
COP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
! P' x2 U3 Q* ~% Z# ~ature of the cascade-condenser and the corresponding maximum COP are presented.& a2 r0 w3 \0 X
2006 Elsevier Ltd and IIR. All rights reserved.1 n# p+ c* M9 Q' X- G
Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-
8 W0 U0 l/ l! l$ ^# [! Ption; COP |
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发表于 2009-9-6 11:19:10
