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Thermodynamic analysis of optimal condensing
& }8 c" D: b5 C+ w( `3 W V" H) mtemperature of cascade-condenser in CO2/NH3/ Y8 |' {/ `8 |& B0 m% ]/ k
cascade refrigeration systems- o7 H9 W; @) A G: l; p# Y
Tzong-Shing Lee*,1
& w6 E6 ~+ d0 R: H- p2 }7 d/ c, Cheng-Hao Liu, Tung-Wei Chen$ \4 G W6 x$ b) ?* ^) P9 j
Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,
7 `: Z0 |/ e" z, lNo. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan A( A' E) t3 I" S9 R* M
Received 10 November 2005; received in revised form 6 March 2006; accepted 6 March 20066 ?! @; o2 S( r [; g6 b V* H Y
Available online 5 June 2006
0 }+ i. U, K7 g% G/ N% `: IAbstract% ]% c4 v& y5 }* J! X F
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-+ q2 \2 l! B2 z
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize
/ z; g! v- z3 `7 a' H ]; r7 |0 l0 I$ zthe COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the; {$ P$ k* G& e0 O
condensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported' [+ G9 Y8 ^1 D
experimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum
% K' s. p- r1 {& v FCOP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
: S+ S# j {+ U7 }3 h- fature of the cascade-condenser and the corresponding maximum COP are presented.
" p- Q4 n( C: v 2006 Elsevier Ltd and IIR. All rights reserved.
" F6 F8 X* C5 W5 y/ \Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-
( M' d2 j% A0 y) W @tion; COP |
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发表于 2009-9-6 11:19:10
