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Thermodynamic analysis of optimal condensing" H4 a" v' b5 z' H# n) S
temperature of cascade-condenser in CO2/NH3
$ t" l' W0 z* ^/ |( T, `5 h4 j1 Kcascade refrigeration systems0 ]6 W/ _3 S, b; V
Tzong-Shing Lee*,11 z& ?- S+ O3 u' X4 c$ c
, Cheng-Hao Liu, Tung-Wei Chen
" M6 }& g" w) yDepartment of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,& P+ e/ c4 M) o' C$ g1 |* J
No. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
! [' K+ I5 S+ j9 E" U! Q5 K5 t7 qReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 2006
) @5 m; ^0 g2 r5 \+ t5 xAvailable online 5 June 2006) I+ A9 a7 p7 U: ] N! u
Abstract- x$ j3 Z9 v5 K$ i
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-4 F& k6 \1 N8 U* V9 @
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize
# |( C8 l) Y _% S( ]$ Gthe COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the
7 }- v! u) E9 W; wcondensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported. w9 r# m+ b" g- Y" ^$ n( \( R
experimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum
! D; L3 C: A/ ~7 ], H. |$ FCOP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
" B' G3 O3 k2 Y! sature of the cascade-condenser and the corresponding maximum COP are presented.
# v* d- y8 V! u" V3 l8 k 2006 Elsevier Ltd and IIR. All rights reserved.
8 U+ ]* }" z9 h; B" E6 lKeywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-
8 T! n1 f$ x( a; Ytion; COP |
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发表于 2009-9-6 11:19:10
