TED-AJ03-519 STUDY ON THERMAL OPTIMIZATION OF HEAT DRIVEN TYPE COMPACT MH REFRIGERATION SYSTEM
スポンサーリンク
概要
- 論文の詳細を見る
In the refrigeration field, the research on the refrigerator using waste heat and natural energy attracts attention from the demand of COP3 Kyoto Protocol and energy source conservation. This MH (Metal Hydride) refrigeration system is one of the candidates. Our research purpose is the development of heat driven type compact MH refrigeration system that consists of four cylindrical heat exchangers filled with two different kinds of MH alloy (MH-1 used for the heat source, MH-2 used for the cooling load). The operating principle of this system is as follow : At the regeneration process, the MH-2 is hydrized, and then at the refrigeration process, MH-2 carries out the discharging of hydrogen. Because this dehydriding behavior is the endothermic reaction, cooling load is obtained. At first, using the experimental system and simulation model, we investigated the optimum operating temperatures and initial system pressure conditions. The thermal optimized operation of this system is achieved under the heat source temperature of 170℃, the middle cooling temperature of 20℃, and the initial system hydrogen pressure of 0.5 MPa. And then, because the hydrogen storage abilities of this two MH alloys are different, we researched the proper MH alloy's mass ratio. As the results of this research, the thermal optimum system performance is achieved at the MH mass ratio condition, 2 : 1 (MH-1 : MH-2). The reason of low refrigeration performance of this system is that the hydriding reaction rate is controlled by low effective thermal conductivity of MH bed (under 1 W/m・K). Therefore, finally, to improve the refrigeration performance, the method of mixing carbon fiber is used in this study. The effect of adding carbon fiber is analyzed by the calculation model and demonstrational system. As the results of this analysis, when the 3wt% carbon fiber is mixed into MH alloy bed respectively, the maximum cooling load per mass is obtained, but COP is not enhanced. Anyway, it turns out that mixing carbon fiber is a good method for enhancement of refrigeration performance.[figure]
- 一般社団法人日本機械学会の論文
著者
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Takemura Yasuhiko
Graduate School Of Science And Engineering Waseda Univ.
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Bae Sang
Dept. Of Mech. Eng. Waseda Univ.
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Nakano Tomoyuki
Graduate School Of Science And Engineering Waseda Univ.
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KATSUTA Masafumi
Dept. of Mech. Eng., Waseda Univ.
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Katsuta Masafumi
Dept. Of Mech. Eng. Waseda Univ.