Study on heat transfer characteristics of loop heat pipe for solar collector

Shota Sato, Shigeki Hirasawa, Tsuyoshi Kawanami, Katsuaki Shirai

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

We experimentally study the thermal conductance of single-Tube and loop heat pipes for a solar collector. The evaporator of the heat pipe is 1 m long, 6 mm in diameter and has 30° inclination. The thermal conductance is defined as the heat transfer rate divided by the temperature difference between the evaporator-wall and the condenser-wall. Effects of heat transfer rate, saturation temperature of the working fluid, liquid filling ratio, inclination angle, and position of the evaporator on the thermal conductance are examined. We found that the thermal conductance of the 30°-inclined loop heat pipe with an upper-evaporator is 40-50 (W/K), which is 1.8 times higher than that of the vertical loop type and 3 times higher than that of the single-Tube type. Thus, the inclined loop heat pipe is preferable for a solar collector. There is an optimum liquid filling ratio. When the liquid filling ratio is too small, a dry-out portion appears in the evaporator. When the liquid filling ratio is too large, the liquid flows in the condenser to decrease heat transfer area. Also we numerically analyze the thermal conductance of a vertical loop heat pipe.

本文言語English
ホスト出版物のタイトルASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
ページ1573-1581
ページ数9
PARTS A, B, C, D
DOI
出版ステータスPublished - 2012 12 1
外部発表はい
イベントASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 - Houston, TX, United States
継続期間: 2012 11 92012 11 15

出版物シリーズ

名前ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
番号PARTS A, B, C, D
7

Other

OtherASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
国/地域United States
CityHouston, TX
Period12/11/912/11/15

ASJC Scopus subject areas

  • 機械工学

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