日本語フィールド
著者：Akio Okamoto, Hirofumi Arima and Yasuyuki Ikegami題名：Characteristic of local boiling heat transfer of ammonia and ammonia / water binary mixture on the plate type evaporator発表情報：Journal of Thermal Science 巻: 20 号: 4 ページ: 332-342キーワード：Local Heat Transfer – Ammonia /Water Mixture – Plate Type Evaporator – OTEC概要：抄録：Power generation using small temperature difference such as ocean thermal energy conversion (OTEC) and discharged thermal energy conversion (DTEC) is expected to be the countermeasures against global warming problem. As ammonia and ammonia/water are used in evaporators for OTEC and DTEC as working fluids, the research of their local boiling heat transfer is important for improvement of the power generation efficiency. Measurements of local boiling heat transfer coefficients were performed for ammonia /water mixture (z = 0.9−1) on a vertical flat plate heat exchanger in a range of mass flux (7.5–15 kg/m2 s), heat flux (15–23 kW/m2), and pressure (0.7–0.9 MPa). The result shows that in the case of ammonia /water mixture, the local heat transfer coefficients increase with an increase of mass flux and composition of ammonia, and decrease with an increase of heat flux.英語フィールド
Author：Akio Okamoto, Hirofumi Arima and Yasuyuki IkegamiTitle：Characteristic of local boiling heat transfer of ammonia and ammonia / water binary mixture on the plate type evaporatorAnnouncement information:Journal of Thermal Science Vol: 20 Issue: 4 Page: 332-342Keyword：Local Heat Transfer – Ammonia /Water Mixture – Plate Type Evaporator – OTECAn abstract：Power generation using small temperature difference such as ocean thermal energy conversion (OTEC) and discharged thermal energy conversion (DTEC) is expected to be the countermeasures against global warming problem. As ammonia and ammonia/water are used in evaporators for OTEC and DTEC as working fluids, the research of their local boiling heat transfer is important for improvement of the power generation efficiency. Measurements of local boiling heat transfer coefficients were performed for ammonia /water mixture (z = 0.9−1) on a vertical flat plate heat exchanger in a range of mass flux (7.5–15 kg/m2 s), heat flux (15–23 kW/m2), and pressure (0.7–0.9 MPa). The result shows that in the case of ammonia /water mixture, the local heat transfer coefficients increase with an increase of mass flux and composition of ammonia, and decrease with an increase of heat flux.