Effect of Chevron Angle on Condensation Heat Transfer of Refrigerants at High Pressures in Plate Heat Exchangers
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- MIYATA Kazushi
- Department of Mechanical Engineering, Kyushu University
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- YANAGIHARA Shuntaro
- Department of Mechanical Engineering, Graduate School, Kyushu University
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- WATANABE Naoto
- Department of Mechanical Engineering, Graduate School, Kyushu University
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- MORI Hideo
- Department of Mechanical Engineering, Kyushu University
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- HAMAMOTO Yoshinori
- Department of Mechanical Engineering, Kyushu University
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- UMEZAWA Shuichi
- TEPCO Research Institute, Tokyo Electric Power Company Holdings, Inc.
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- SUGITA Katsuhiko
- TEPCO Research Institute, Tokyo Electric Power Company Holdings, Inc.
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<p>In industrial fields, heat source over 130°C are widely needed, and for this development of industrial high-temperature heat pump systems has been promoted. For the heat release process in such the heat pump systems, the authors have studied on cooling heat transfer at supercritical pressures and condensation heat transfer at high subcritical pressures of refrigerants flowing in chevron-type plate heat exchangers (PHEs). In this study, to examine the effect of chevron angle on condensation heat transfer of refrigerants at high subcritical pressures, experiments were conducted using chevron PHEs with respective chevron angles 30°, 47.5° and 65°. In the experiments, condensation heat transfer coefficients were obtained in wide range of bulk fluid enthalpy comprising whole the saturated region, at pressures of reduced pressures from 0.65 to 0.80, and mass flow rates of 7 and 11 kg/min. The measured condensation heat transfer coefficient increased with the chevron angle. The increase rate of the condensation heat transfer coefficient against the chevron angle was compared with that of condensation heat transfer coefficient from a conventional correlation developed based on low subcritical pressures data and that of cooling heat transfer coefficient at a supercritical pressure from a previous experiment.</p>
収録刊行物
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- 日本冷凍空調学会論文集
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日本冷凍空調学会論文集 35 (4), 383-, 2018-12-31
公益社団法人 日本冷凍空調学会
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詳細情報 詳細情報について
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- CRID
- 1390002184859986944
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- NII論文ID
- 130007777911
- 40021779642
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- NII書誌ID
- AA11125910
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- ISSN
- 2185789X
- 13444905
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- NDL書誌ID
- 029450584
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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