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Technical Briefs

Effect of Variable Heating Load on the Refrigerant Distribution of a Dual Cold-Plate System

[+] Author and Article Information
Cheng-Wei Tien, Wen-Junn Sheu

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan

Kun-Huang Yu

Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan

Chi-Chuan Wang1

Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwanccwang@itri.org.tw

1

Corresponding author. Present address: D100 ERL/ITRI Building 64, 195-6 Section 4, Chung Hsing Road, Chutung, Hsinchu 310, Taiwan.

J. Electron. Packag 131(2), 024501 (Mar 27, 2009) (5 pages) doi:10.1115/1.3103940 History: Received January 18, 2008; Revised January 06, 2009; Published March 27, 2009

This study examines the refrigerant distribution of a dual cold-plate system subject to the influence of heating load, using a R-134a based vapor compression system with a nominal capacity ranging from 50 W to 250 W. The cold plate is of identical configuration. Initially, test is performed under an equal heating load for each cold plate (70 W), which then gives rise to a uniform distribution and equal outlet superheat condition. For an unequal heating load, it is found that the distribution of mass flowrate subject to the influence of heating load is strongly related to the outlet states of the two cold plates. For the condition where one of the cold plates is in superheated state while the other is in saturated state, the mass flowrate for the fixed heating load is lower than that of smaller heating load, and the difference increases when the heating load gets smaller due to the influence of accelerational pressure drop. A maximum of 17% difference is seen at a loading ratio of 0.571 (40 W/70 W). For the condition where both outlet states of the cold plate are at superheated states, the mass flowrate for the fixed heating load is marginally higher than that of the smaller heating load, and the difference is insensitive to the increase in heating load. For this situation, the effect of accelerational pressure is negligible, and it is mainly attributed to two-phase/single-phase distribution pertaining to the effect of heating load.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Photos of the R-134a compressor: (a) compressor and (b) controller

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Figure 3

Detailed dimension of the cold-plate heat sink

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Figure 4

Influence of reducing heating load of H2 on the (a) mass flowrate distribution and (b) outlet temperature of cold plates H1 and H2

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Figure 5

Schematic of the inlet state and pressure drop measurement of the cold plate

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Figure 6

Influence of increasing heating load of H1 on the (a) mass flowrate distribution and (b) outlet temperature of cold plates H1 and H2

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Figure 7

Schematic of two-phase/vapor-phase portion subject to the increasing heating load of H1 when both cold plates are maintained at the superheated state

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Figure 1

Schematic of the test apparatus

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