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

Tzer-Ming Jeng,Chia-Hung Chang,Hsiao-Yun Peng,Ching-Wen Tseng,Huang-Han Chen,Yi-Cheng Liu,Sheng-Chung Tzeng

doi:10.3390/inventions1020010

Tzer-Ming Jeng, Chia-Hung Chang + Show 5 more

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https://doi.org/10.3390/inventions1020010

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Abstract

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.

Highlights

Heat exchangers are widely applied to many industrial applications, including heating in boilers and cooling in condensers
(3) the copper heat exchanger sintered by multiple copper sheets with rectangular punched punched holes forming cross-runners (Model C)
Three different cross-runner heat exchanger configurations were used: (1) the aluminum alloy heat exchanger with a cross-runner heat exchanger configurations were used: (1) the aluminum alloy heat exchanger with a staggered rectangular-fin array (Model A); (2) the aluminum alloy heat exchanger with a staggered 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)

Summary

Introduction

Heat exchangers are widely applied to many industrial applications, including heating in boilers and cooling in condensers. Since that the modern 3C electronic chips are increased in the computing speeds and narrowed in the dimensions, the operating temperature of such chips goes up greatly. In order to maintain a normal operating temperature for the modern chips, the total heat exchange surface area and the structural complexity of the heat sink installed on the chips are increased. The overall convection heat transfer between the fluid and fin matrix can be enhanced effectively due to the increase of heat dispersion area and the improvement of fluid turbulence. The result is better reliability and a longer service life for electronic components and machinery. This kind of finned heat sink is manufactured and inexpensive. The key factors that influence the performance of finned heat sink include the fluid velocity, the thermal properties of the fluid and the fins, the height and cross-sectional shape of the fins, the arrangement and relative pitch for the fin array, the bypass effect, and so on

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Results

Conclusion