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Design Innovation

An Innovative Falling Film Evaporative Cooling With Recirculation Driven by Low-Grade Heat

[+] Author and Article Information
S. He, Z. Z. Xia, B. Tian, L. W. Wang

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China

R. Z. Wang1

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, P.R. Chinarzwang@sjtu.edu.cn

1

Corresponding author.

J. Thermal Sci. Eng. Appl 1(4), 045001 (May 14, 2010) (6 pages) doi:10.1115/1.4001623 History: Received August 29, 2009; Revised April 05, 2010; Published May 14, 2010; Online May 14, 2010

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 67706870W/m2K can be achieved when the inlet temperature of the falling fluid is 29°C and the hot water entry temperature is 70°C. 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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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Principle diagram of falling film evaporator: (a) the innovative one and (b) a typical traditional one

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Figure 2

Photograph of the test rig

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Figure 3

Schematic of the test loop

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Figure 4

Effect of driving heat source temperature: (a) on temperature difference of hot water at the inlet and outlet and (b) on cooling capacity

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Figure 5

Effect of driving heat source temperature on heat transfer performance: (a) heat transfer coefficient and (b) dimensionless heat transfer coefficient

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Figure 6

Effect of the inlet temperature of cooling liquid film

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Figure 7

Temperature distribution of the hot water from the bottom of the tube

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Figure 8

Experimental values and fitting curve

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Figure 9

Regression error

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