Micro-channel Vapor Compression Refrigeration System for Electrical Cooling
Date Issued
2008
Date
2008
Author(s)
Wu, Meng-Hsun
Abstract
This research apply Micro-channel Evaporator to Vapor Compression Refriger- ation System (VCRS) for electrical Cooling. Steady and transient States experimental investigations are conducted to analysis the thermal properties depends on the design experimental factor.The cooling capacity of the VCRS varied from 250W to 400W, with COP from 1.7 to 3, at pressure ratios of 1.6 to 2.8.The highest overall second-law efficiency was 70%. In steady state experiment. Micro-channel evaporator efficiently make the heat exchange between CPU base and the evaporator, improving the coefficient of perfor- mance .Because of the icreacing heat load ,too much gass R-134a decreased the heat transfer coefficient.This research discussed the mechanism of the two phase flow in high-heat-flux micro-channel ,using evaporator thermal resistance model in order to predict and control the CPU temperature. In transient experiment.Transient evaporator temperature can control R-134a quality and mass flow rate .A complete experimental and numerical medole was built and tested in order to find out optimimal control of the CPU temperature.
Subjects
Micro-channel Vapor compression refrigeration cycle
Electronic cooling
Temperature control
Type
thesis
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ntu-97-R95522102-1.pdf
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