Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers -
The purpose of this study is to develop the compact auxiliary water heater using tubular flame for home CHP (combined heat and power). The tubular-flame water-heater consists of the tubular flame burner, the coiled tube heat exchanger and the inserted tube installed at the center of the coiled tube...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2014-10-01
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| Series: | Mechanical Engineering Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/mej/1/5/1_2014tep0047/_pdf/-char/en |
| _version_ | 1818987541598044160 |
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| author | Ryosuke MATSUMOTO Tatsuro TANIKAWA Tatsuya SUGIMOTO Mamoru OZAWA Yoshinori HISAZUMI Tsukasa HORI Noriko KAWAI Akeshi KEGASA Yosuke SHIRAGA Toshikazu TAKEMORI Masashi KATSUKI |
| author_facet | Ryosuke MATSUMOTO Tatsuro TANIKAWA Tatsuya SUGIMOTO Mamoru OZAWA Yoshinori HISAZUMI Tsukasa HORI Noriko KAWAI Akeshi KEGASA Yosuke SHIRAGA Toshikazu TAKEMORI Masashi KATSUKI |
| author_sort | Ryosuke MATSUMOTO |
| collection | DOAJ |
| description | The purpose of this study is to develop the compact auxiliary water heater using tubular flame for home CHP (combined heat and power). The tubular-flame water-heater consists of the tubular flame burner, the coiled tube heat exchanger and the inserted tube installed at the center of the coiled tube as an additional heat exchanger. The tubular flame is formed in a rotating flow field by injecting the air-fuel mixture tangentially into the cylindrical chamber. The swirling flow of the combustion gas flows through the gap between the coiled tube and inserted tube. The high heat transfer performance can be achieved on these heat exchangers without the expanded heat transfer surface due to the swirling flow. Thus, the compact water heater can be constructed by using the tubular flame burner. At the first stage of the development, the maximum thermal efficiency achieves 81 % at the combustion rate of 15 kW. The heat transfer characteristics on the coiled tube and the inserted tube is investigated under the combustion and non-combustion conditions. Heat transfer coefficient on the coiled tube has about 5.6 times higher than that under the no-swirling flow condition at the same flow rate. Nusselt number on the coiled tube heat exchanger and the inserted tube can be estimated by Dhir's correlation equation for the swirling flow, which was provided as a function of the ratio between tangential momentum and axial momentum. The heat transfer characteristics on not only the coiled tube but the inserted tube was dominated by the swirling convection flow. |
| first_indexed | 2024-12-20T19:08:20Z |
| format | Article |
| id | doaj.art-60a455bb19b84d70a66b399ad49c9485 |
| institution | Directory Open Access Journal |
| issn | 2187-9745 |
| language | English |
| last_indexed | 2024-12-20T19:08:20Z |
| publishDate | 2014-10-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj.art-60a455bb19b84d70a66b399ad49c94852022-12-21T19:29:15ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452014-10-0115TEP0047TEP004710.1299/mej.2014tep0047mejDevelopment of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers -Ryosuke MATSUMOTO0Tatsuro TANIKAWA1Tatsuya SUGIMOTO2Mamoru OZAWA3Yoshinori HISAZUMI4Tsukasa HORI5Noriko KAWAI6Akeshi KEGASA7Yosuke SHIRAGA8Toshikazu TAKEMORI9Masashi KATSUKI10Department of Mechanical Engineering, Kansai UniversityDepartment of Mechanical Engineering, Kansai UniversityDepartment of Mechanical Engineering, Kansai UniversityDepartment of Mechanical Engineering, Kansai UniversityDepartment of Mechanical Engineering, Osaka UniversityDepartment of Mechanical Engineering, Osaka UniversityDepartment of Mechanical Engineering, Osaka UniversityDepartment of Mechanical Engineering, Osaka UniversityOsaka Gas Co. , Ltd.Osaka Gas Co. , Ltd.Professor Emeritus at Osaka UniversityThe purpose of this study is to develop the compact auxiliary water heater using tubular flame for home CHP (combined heat and power). The tubular-flame water-heater consists of the tubular flame burner, the coiled tube heat exchanger and the inserted tube installed at the center of the coiled tube as an additional heat exchanger. The tubular flame is formed in a rotating flow field by injecting the air-fuel mixture tangentially into the cylindrical chamber. The swirling flow of the combustion gas flows through the gap between the coiled tube and inserted tube. The high heat transfer performance can be achieved on these heat exchangers without the expanded heat transfer surface due to the swirling flow. Thus, the compact water heater can be constructed by using the tubular flame burner. At the first stage of the development, the maximum thermal efficiency achieves 81 % at the combustion rate of 15 kW. The heat transfer characteristics on the coiled tube and the inserted tube is investigated under the combustion and non-combustion conditions. Heat transfer coefficient on the coiled tube has about 5.6 times higher than that under the no-swirling flow condition at the same flow rate. Nusselt number on the coiled tube heat exchanger and the inserted tube can be estimated by Dhir's correlation equation for the swirling flow, which was provided as a function of the ratio between tangential momentum and axial momentum. The heat transfer characteristics on not only the coiled tube but the inserted tube was dominated by the swirling convection flow.https://www.jstage.jst.go.jp/article/mej/1/5/1_2014tep0047/_pdf/-char/entubular flameheat transfer coefficientswirling flowcombustion gaswater heaterhome chp |
| spellingShingle | Ryosuke MATSUMOTO Tatsuro TANIKAWA Tatsuya SUGIMOTO Mamoru OZAWA Yoshinori HISAZUMI Tsukasa HORI Noriko KAWAI Akeshi KEGASA Yosuke SHIRAGA Toshikazu TAKEMORI Masashi KATSUKI Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - Mechanical Engineering Journal tubular flame heat transfer coefficient swirling flow combustion gas water heater home chp |
| title | Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - |
| title_full | Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - |
| title_fullStr | Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - |
| title_full_unstemmed | Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - |
| title_short | Development of water heater using tubular flame - Heat transfer characteristics on the coiled tube and the inserted tube heat exchangers - |
| title_sort | development of water heater using tubular flame heat transfer characteristics on the coiled tube and the inserted tube heat exchangers |
| topic | tubular flame heat transfer coefficient swirling flow combustion gas water heater home chp |
| url | https://www.jstage.jst.go.jp/article/mej/1/5/1_2014tep0047/_pdf/-char/en |
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