A falling film evaporator integrated with a recirculation tube driven by low-grade heat has been proposed to achieve a more compact and reliable system, which can be easily integrated into small-scale systems. An experimental study of the evaporative cooling of such an innovative falling film evaporator is presented. Water was used as the working fluid. The results are compared with published data for systems using mechanical pumps to circulate the fluid. Experimental investigation showed that the evaporative heat transfer coefficient of can be achieved when the inlet temperature of the falling fluid is and the hot water entry temperature is . Detailed investigation on the effects of the driving heat source temperature and the inlet temperature of the hot water on the liquid film cooling mechanism was investigated. The results showed that for such a system, the effect of the falling film inlet temperature is more pronounced as compared with the other two parameters. Comparisons with traditional falling film evaporator with a mechanical pump indicated that the proposed integrated evaporator is more compact, reliable, and cost effective without impairing the heat transfer performance.
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e-mail: rzwang@sjtu.edu.cn
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December 2009
Design Innovations
An Innovative Falling Film Evaporative Cooling With Recirculation Driven by Low-Grade Heat
S. He,
S. He
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
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R. Z. Wang,
R. Z. Wang
Institute of Refrigeration and Cryogenics,
e-mail: rzwang@sjtu.edu.cn
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
Search for other works by this author on:
Z. Z. Xia,
Z. Z. Xia
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
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B. Tian,
B. Tian
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
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L. W. Wang
L. W. Wang
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
Search for other works by this author on:
S. He
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
R. Z. Wang
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. Chinae-mail: rzwang@sjtu.edu.cn
Z. Z. Xia
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
B. Tian
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. China
L. W. Wang
Institute of Refrigeration and Cryogenics,
Shanghai Jiao Tong University
, Shanghai 200240, P.R. ChinaJ. Thermal Sci. Eng. Appl. Dec 2009, 1(4): 045001 (6 pages)
Published Online: May 14, 2010
Article history
Received:
August 29, 2009
Revised:
April 5, 2010
Online:
May 14, 2010
Published:
May 14, 2010
Citation
He, S., Wang, R. Z., Xia, Z. Z., Tian, B., and Wang, L. W. (May 14, 2010). "An Innovative Falling Film Evaporative Cooling With Recirculation Driven by Low-Grade Heat." ASME. J. Thermal Sci. Eng. Appl. December 2009; 1(4): 045001. https://doi.org/10.1115/1.4001623
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