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Thermodynamic analysis of optimal condensing, ~( _- d8 s- K- b
temperature of cascade-condenser in CO2/NH32 f3 m1 Z( m5 O0 `& A8 _
cascade refrigeration systems% P; z6 m x" m1 I- W, x
Tzong-Shing Lee*,1- z) f. J g2 C
, Cheng-Hao Liu, Tung-Wei Chen
* a( {& `0 V+ N5 u; Z" }+ ADepartment of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,
+ K+ p7 a6 c- u: x3 L4 QNo. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
# b4 m2 g# _/ zReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 2006
. N+ Y1 \, a L! z( qAvailable online 5 June 2006
0 p4 |* u8 o- q; H5 ?5 w% `Abstract( w* y( h" x6 X+ W% a" X
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-$ o! |- v1 b2 @) S; P
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize& x2 d, |9 E5 Q
the COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the
6 R5 L/ v$ ]& t! k$ Q7 ]8 tcondensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported: I- ^8 r0 m, B8 U1 q/ |
experimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum6 i; A! i% G$ w" y
COP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-1 \. w/ `* v3 Z
ature of the cascade-condenser and the corresponding maximum COP are presented.
2 ?: a" B1 i# q/ V7 ` 2006 Elsevier Ltd and IIR. All rights reserved.. @+ V' `5 R- j" u, w! W3 O
Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-9 H; N% c( W. _) {- \# h8 M
tion; COP |
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发表于 2009-9-6 11:19:10
