TRANSIENT HEAT TRANSFER CHARACTERISTICS OF INCLINED LOOP-THERMOSYPHON-TYPE HEAT PIPE FOR SOLAR COLLECTOR WITH CHANGING INPUT SOLAR HEAT FLUX

Shigeki Hirasawa; Shota  Sato; Tsuyoshi Kawanami; Katsuaki Shirai

doi:10.1615/HeatPipeScieTech.v5.i1-4.670

Heat Pipe Science and Technology, An International Journal

Editor chefes: Leonard L. Vasiliev (open in a new tab) Marcia Barbosa Henriques Mantelli (open in a new tab)

Publicou 4 edições por ano

ISSN Imprimir: 2151-7975

ISSN On-line: 2151-7991

TRANSIENT HEAT TRANSFER CHARACTERISTICS OF INCLINED LOOP-THERMOSYPHON-TYPE HEAT PIPE FOR SOLAR COLLECTOR WITH CHANGING INPUT SOLAR HEAT FLUX

Volume 5, Edição 1-4, 2014, pp. 581-588

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.670

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Shigeki Hirasawa
Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan

Shota Sato
Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan

Tsuyoshi Kawanami
Department of Mechanical, Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 6578501, Japan

Katsuaki Shirai
Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan

RESUMO

We experimentally study the steady-state and transient heat transfer characteristics of an inclined loop-thermosyphon-type heat pipe for a solar collector system when input solar heat flux changes according to the weather. The evaporator of the heat pipe is 1 m long, 6 mm in diameter and 30°-inclination. The input heating rate to the evaporator changes periodically 200 W for 240 s and 0 W for 240 s. The thermal conductance is defined as the effective heat transfer rate to the condenser divided by the temperature difference between the evaporator-wall and the condenser-wall. We found that the condenser temperature decreases just after the change of the input heating rate to steady-state heating condition 200 W by the effect of the low temperature vapor coming from the evaporator. The thermal conductance comes to be steady-state condition after 60 s from the change of the input heating rate to steady-state heating condition 200 W. Also we examine effects of liquid filling ratio and inclination angle on the thermal conductance.

Palavras-chave: two-phase thermosyphon, inclined loop, transient, thermal conductance, solar collector

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