Thermal Performance of Electrocaloric Refrigeration using Thermal Switches of Fluid Motion and Changing Contact Conductance
American Journal of Physics and Applications
Volume 4, Issue 5, September 2016, Pages: 134-139
Received: Sep. 19, 2016; Published: Sep. 19, 2016
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Authors
Shigeki Hirasawa, Department of Mechanical Engineering, Kobe University, Kobe, Japan
Tsuyoshi Kawanami, Department of Mechanical Engineering, Kobe University, Kobe, Japan
Katsuaki Shirai, Department of Mechanical Engineering, Kobe University, Kobe, Japan
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Abstract
Thermal performance of electrocaloric refrigeration system composed with a thin electrocaloric material and thermal switches was numerically calculated. Two types of thermal switches were studied: a thermal switch of fluid motion and a thermal switch by changing the contact thermal conductance. The following results were obtained. For the thermal switch of fluid motion with the frequency 10 Hz, the thicknesses of the electrocaloric material 200 μm and the water flow channel 100 μm, the average heat transfer efficiency was 11%. For the thermal switch by changing contact thermal conductance with the frequency 1000 Hz, the thicknesses of the electrocaloric material 20 μm and the heat storage material 20 μm, the average heat transfer efficiency was 6% and the average heat flux transferred to the cold side of the system was 7 x 104 W/m2.
Keywords
Electrocaloric Refrigeration, Thermal Switch, Fluid, Contact, Thermal Resistance, Heat Transfer, Efficiency
To cite this article
Shigeki Hirasawa, Tsuyoshi Kawanami, Katsuaki Shirai, Thermal Performance of Electrocaloric Refrigeration using Thermal Switches of Fluid Motion and Changing Contact Conductance, American Journal of Physics and Applications. Vol. 4, No. 5, 2016, pp. 134-139. doi: 10.11648/j.ajpa.20160405.12
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