Study on periodic thermal-switching behavior of flat heat pipe

Shigeki Hirasawa, Tatsuya Nakamu, Tsuyoshi Kawanami, Katsuaki Shirai

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

The coupling of the electrocaloric effect in thin films with thermal switches has the potential to be used for efficient refrigeration. We studied the unsteady heat transfer performance and periodic thermal-switching behavior of a flat heat pipe to transfer cold energy from a changing heat source. The condenser of the flat heat pipe was the changing heat source and changed from -20 W to +20 W every 5 s. The temperature of the condenser surface changed in accordance with the heat generation of the heat source. The evaporator was a plate with a mesh wick attached to a water-flow pipe. Cold energy transferred from the condenser surface to the evaporator surface only when the temperature of the condenser surface was lower than that of the evaporator surface. We analyzed the unsteady temperature change and heat transfer performance of the flat heat pipe by numerical simulation. The analytical results showed that it was necessary to have two thermal switches to separate the heat energy and cold energy of the changing heat source. Also, it was important to reduce the thermal resistance and heat capacity of the evaporator surface to improve the unsteady heat transfer performance of the heat pipe. Next, we measured the unsteady heat transfer performance of the flat heat pipe experimentally. The experimental results showed that the thermal-switching behavior was observed when the heat generation of the heat source changed every 5 s.

本文言語English
ホスト出版物のタイトルHeat Transfer and Thermal Engineering
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791857502
DOI
出版ステータスPublished - 2015
外部発表はい
イベントASME 2015 International Mechanical Engineering Congress and Exposition, IMECE 2015 - Houston, United States
継続期間: 2015 11 132015 11 19

出版物シリーズ

名前ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
8B-2015

Other

OtherASME 2015 International Mechanical Engineering Congress and Exposition, IMECE 2015
国/地域United States
CityHouston
Period15/11/1315/11/19

ASJC Scopus subject areas

  • 機械工学

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