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Thermodynamic analysis of optimal condensing6 x, s$ P5 i6 P
temperature of cascade-condenser in CO2/NH3, Z) |4 k( F4 [
cascade refrigeration systems, W6 x5 ~$ M7 O2 B6 ~$ m: w1 ]) J% S
Tzong-Shing Lee*,1" q1 H& V- r* I# V+ f
, Cheng-Hao Liu, Tung-Wei Chen3 O- N0 J5 a9 _, G
Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,* B. G5 S4 P. u$ x, v0 W8 r. Y9 j
No. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
) M0 n* i% y0 ~; K- {; q2 d/ ?- _Received 10 November 2005; received in revised form 6 March 2006; accepted 6 March 20066 a, ~; D6 {. a9 b0 M) I
Available online 5 June 20062 }0 S4 o9 R0 F/ R
Abstract
4 p4 T5 X. |! e1 n+ j- B4 q3 rThis study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-7 k; o, {% |! l8 O
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize
. {5 y% X/ ]7 n0 e( j# othe COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the
7 P# V' M/ U8 hcondensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported
* t6 Y4 ?; z& n6 g8 B* S8 Wexperimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum
$ Z/ @+ W& A5 I( i: Z/ ^# k& Q4 ICOP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
) B' `; u. i/ {5 ~* B& yature of the cascade-condenser and the corresponding maximum COP are presented.
! S& \ ~6 B1 g' K6 {& ?& _ 2006 Elsevier Ltd and IIR. All rights reserved.) c/ W/ b# [4 @# I8 |; [
Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-
6 ]0 y+ o) \3 ?tion; COP |
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发表于 2009-9-6 11:19:10
