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Inventions 2016, 1(2), 10;

Novel Heat Exchangers with Cross-Runners for Air and Water Cooling

Department of Mechanical Engineering, Chienkuo Technology University, 50094 Changhua, Taiwan
Department of Energy Engineering, National United University, 36003 Miaoli, Taiwan
Liquid Cooler Technology Co., LTD., 24142 New Taipei, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Chi-Chuan Wang
Received: 15 March 2016 / Revised: 6 May 2016 / Accepted: 12 May 2016 / Published: 23 May 2016
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This work experimentally investigated the pressure drops and heat transfer characteristics of cross-runner heat exchangers. Three kinds of configurations employed were, (1) the aluminum alloy heat exchanger with a staggered rectangular-fin array (Model A); (2) the aluminum alloy heat exchanger with a staggered round pin fin array (Model B); and (3) the copper heat exchanger sintered by multiple copper sheets with rectangular punched holes forming cross-runners (Model C). The results indicate that increasing heat-transfer area (AHT) and decreasing porosity (ε) of the heat exchanger significantly enhanced the heat transfer capacity of the cross-runner heat exchanger, but also increased flow resistance. At the same pumping power for the air-cooled heat transfer experiment, the Nu of Model C was 2.27 and 1.67 times that of Models A and B respectively. Additionally, this study proposed the semi-empirical correlations of dimensionless pressure drop and Nusselt number in terms of Reynolds number for air-cooling measurements. Finally, the feasibility of using the present cross-runner heat exchangers for an instantaneous water heater was also investigated according to the water-cooled heat transfer experiment and the results showed great commercial potential of Model C. View Full-Text
Keywords: cross runners; heat exchanger; pin-fin array; heat transfer cross runners; heat exchanger; pin-fin array; heat transfer

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Jeng, T.-M.; Tzeng, S.-C.; Tseng, C.-W.; Chang, C.-H.; Liu, Y.-C.; Peng, H.-Y.; Chen, H.-H. Novel Heat Exchangers with Cross-Runners for Air and Water Cooling. Inventions 2016, 1, 10.

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