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Thermodynamic analysis of optimal condensing3 n- `8 y2 b& h$ l7 p- C2 v; ^1 Y
temperature of cascade-condenser in CO2/NH3; q/ v/ A; q X% |+ E
cascade refrigeration systems; _. b5 [) t3 y; G9 R4 ]/ M
Tzong-Shing Lee*,1# i7 x: J. i/ i+ X# Q* t
, Cheng-Hao Liu, Tung-Wei Chen
3 g. C4 j% }2 s* P0 ^5 `! I) [Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology,0 G R7 o( ?9 n& h* |9 C% q
No. 1, Sec. 3, Chung-Hsiao East Road, Taipei 106, Taiwan
. |7 [) d6 R; t+ x' c8 BReceived 10 November 2005; received in revised form 6 March 2006; accepted 6 March 20061 B2 [( ~1 X- D" Q+ q, i2 P( \
Available online 5 June 2006
( _- W7 a9 T% v* J1 QAbstract) K0 T, Y3 d" G8 E+ |9 N$ t5 \
This study thermodynamically analyzed a cascade refrigeration system that uses carbon dioxide and ammonia as refriger-
. d* ]/ ?) q" W/ B& W Z: }: v( R: `ants, to determine the optimal condensing temperature of the cascade-condenser given various design parameters, to maximize5 |0 @+ K* r Q* o/ H. H
the COP and minimize the exergy destruction of the system. The design parameters include: the evaporating temperature, the7 }6 f- e, q3 S8 _6 c
condensing temperature and the temperature difference in the cascade-condenser. The results agreed closely with the reported
3 x# \: ?4 ^& Y+ `) G& Bexperimental data. The optimal condensing temperature of the cascade-condenser increases with TC, TE and DT. The maximum5 \+ F# p! |2 K x1 R* A1 C9 N/ X4 F+ B3 Y
COP increases with TE, but decreases as TC or DT increases. Two useful correlations that yield the optimal condensing temper-
: f0 f2 c9 B: L8 I! ^0 hature of the cascade-condenser and the corresponding maximum COP are presented.
% Y/ `9 I; |1 m" n7 y9 j7 b 2006 Elsevier Ltd and IIR. All rights reserved.
( I! l7 h" A QKeywords: Refrigeration system; Compression system; Cascade system; Ammonia; Carbon dioxide; Optimization; Temperature; Condensa-
3 p. F' c$ | i& [! X; w3 C$ z6 Q7 D9 Ztion; COP |
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发表于 2009-9-6 11:19:10
