The ocean thermal energy conversion (OTEC) is attracted attention as one of the promising renewable energy. OTEC uses small temperature difference between surface and deep sea water. Plate-type heat exchangers, or evaporators, are usually used for OTEC to obtain vapor for electric generator. Ammonia is used for OTEC as a working fluid. It is important to improve thermal performance of an evaporator for the OTEC. Channel dimension is one of the important factors to improve heat transfer performance of an evaporator. In this study, the measurement and comparison of local heat transfer coefficient for three channels are experimentally performed. The experiments are conducted for a range of mass flux (5 and 7.5 kg/m2s), heat flux (10 to 25 kW/m2), and pressure (0.7 and 0.9 MPa). The results show that the heat transfer coefficient increases as decreases channel height. The modified emprical correlation for a plate-type evaporator is proposed.
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ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
July 14–19, 2013
Minneapolis, Minnesota, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-5548-5
PROCEEDINGS PAPER
Effect of Channel Geometry on Ammonia Boiling Heat Transfer of a Plate-Type Evaporator Available to Purchase
Kohei Koyama,
Kohei Koyama
Saga University, Imari, Saga, Japan
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Hirotaka Chiyoda,
Hirotaka Chiyoda
Saga University, Saga, Saga, Japan
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Hirofumi Arima,
Hirofumi Arima
Saga University, Imari, Saga, Japan
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Yasuyuki Ikegami
Yasuyuki Ikegami
Saga University, Imari, Saga, Japan
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Kohei Koyama
Saga University, Imari, Saga, Japan
Hirotaka Chiyoda
Saga University, Saga, Saga, Japan
Hirofumi Arima
Saga University, Imari, Saga, Japan
Yasuyuki Ikegami
Saga University, Imari, Saga, Japan
Paper No:
HT2013-17533, V002T07A020; 7 pages
Published Online:
December 21, 2013
Citation
Koyama, K, Chiyoda, H, Arima, H, & Ikegami, Y. "Effect of Channel Geometry on Ammonia Boiling Heat Transfer of a Plate-Type Evaporator." Proceedings of the ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology. Minneapolis, Minnesota, USA. July 14–19, 2013. V002T07A020. ASME. https://doi.org/10.1115/HT2013-17533
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