20 February 2015 IR assessment of R134a temperature in circular micro-channels
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Proceedings Volume 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII; 92581N (2015) https://doi.org/10.1117/12.2070335
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies 2014, 2014, Constanta, Romania
Abstract
Miniature cooling systems performances are increasing, as they permit dissipation of heat fluxes on increasing surfaces. Such cooling systems frequently use micro and nano circular tubes, with rectangular or other various shaped crosssections, as they allow obtaining higher performance micro heat exchangers. The present paper illustrates the differences between temperature variations, experimentally measured inside and outside circular micro-channels by aid of thermo vision, and compared to values experimentally measured outside the micro-channels by aid of heat sensors and to theoretically evaluated temperatures inside. The experimental measurements were performed on a setup conceived for the cooling of electronic components or small bio-surfaces in the order of magnitude of a few square centimeters. The set-up allows reaching minimum negative temperatures of -22 °C. The experimental setup uses a rotary compressor with variable speed and working pressures implicitly, which allows obtaining different temperatures at the setup’s evaporator. The present work correlates experimentally measured temperatures with ones determined theoretically for the flow of R134a refrigerant through cylindrical micro-channels made of copper.
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Ioan Mihai, Ioan Mihai, Cornel Suciu, Cornel Suciu, Liliana Patuleanu, Liliana Patuleanu, Silviu Sprinceana, Silviu Sprinceana, } "IR assessment of R134a temperature in circular micro-channels", Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 92581N (20 February 2015); doi: 10.1117/12.2070335; https://doi.org/10.1117/12.2070335
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