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Thermodynamic analysis of optimal condensing5 l, H9 |2 n/ F: h1 m6 f8 ?
temperature of cascade-condenser in CO2/NH3
: g, z9 p4 W$ b3 l1 ?8 ccascade refrigeration systems
/ M( p5 [7 l7 p" x7 t [% RTzong-Shing Lee*,1
- S; S3 \' w2 @( H, Cheng-Hao Liu, Tung-Wei Chen
3 E @& n8 P# E( o9 N5 h# bDepartment of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,& U `+ T+ K0 I
No. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan$ x- Y- o& w- T; O Z
Received 10 November 2005; received in revised form 6 March 2006; accepted 6 March 20067 u6 T# w. ~) b5 ]. n$ H/ v
Available online 5 June 2006& }5 L% K2 L% L' v
Abstract2 |6 R4 `6 `9 A
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-' R% b2 Y" F' G5 E
ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize+ ~6 Q/ g n. x" a
the COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the8 P/ L; F8 {; |: q6 ~7 X
condensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported! g8 }$ R2 V" B0 M. r
experimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum
/ t/ [2 `: Y3 c: y. \1 ECOP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
4 U' | I: b3 Vature of the cascade-condenser and the corresponding maximum COP are presented.
" s' Z( `+ Q1 O" z" k [# g 2006 Elsevier Ltd and IIR. All rights reserved.& m# @% }0 Q+ s2 { \+ w7 }
Keywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-9 v7 T& `& P6 B- i& Q
tion; COP |
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发表于 2009-9-6 11:19:10
