F107 DEVELOPMENT OF COMPACT LATENT HEAT RECOVERY HEAT EXCHANGER FOR GAS WATER HEATER IN HOUSEHOLD USE(Heat Exchanger)
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概要
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Since hot-water supply has high percentage of energy consumption in civilian sector of Japan, improvement in efficiency of a gas water heater is an important issue. In order to improve thermal efficiency of a gas water heater, an additional heat exchanger is required for latent heat recovery from exhaust humid combustion. It is necessary to design heat exchanger for various gas conditions, such as flow rate and temperature of gas and water, gas humidity. Compactness is also strongly required. The purpose of this study is to develop a design approach based on numerical simulation of latent heat recovery heat exchanger. Dewdrops on a heat transfer surface may adversely affect its heat transfer performance. In this paper, two methods for removal of dewdrop were examined. One is a vertical tube bank heat exchanger, and the other is microgrooves on horizontal tubes. The designed secondary heat exchanger was mounted on a commercial gas water heater, and could improve the thermal efficiency to about 95.5 % (HHV).
- 一般社団法人日本機械学会の論文
- 2009-11-16
著者
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Asano Hitoshi
Department Of Mechanical Engineering Kobe University
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Hamada Tetsurou
Noritz Corp.
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Asano Hitoshi
Department Of Applied Chemistry Faculty Of Engineering Gunma University
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FUJIYAMA Junichi
Department of Mechanical Engineering, Kobe University
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TSUJIMOTO Eisaku
Department of Mechanical Engineering, Kobe University
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HIROTSU Makoto
Noritz Corp.
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Tsujimoto Eisaku
Department Of Mechanical Engineering Kobe University
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Fujiyama Junichi
Department Of Mechanical Engineering Kobe University
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