日本語フィールド
著者：岡本明夫、有馬博史、池上康之題名：微細凹凸面を有するチタン製プレート式蒸発器におけるアンモニアの沸騰熱伝達促進発表情報：神戸製鋼技報 巻: 60 号: 2 ページ: 60-65キーワード：概要：抄録：Small thermal energy conversion, such as ocean thermal energy conversion (OTEC), is being looked to as the new energy. As small thermal energy conversion cycles have low thermal efficiency, these systems use plate
type heat exchangers (PHE) for evaporators and condensers, and ammonia or an ammonia/water mixture as a working fluid. Since sea water is often used as the heat source for small thermal energy conversion, titanium is expected to become the main material for plates in PHEs for these systems because of its excellent corrosion resistance. Therefore, in order to improve the efficiency of plate evaporators for small thermal energy conversion, we propose using titanium plate with a micro-grooved surface for the plate evaporator.
Measurements were performed to determine the local boiling heat transfer coefficient for pure ammonia under forced convection on a micro-grooved surface and flat surface in a vertical evaporator in a range of mass flux (2-
7.5kg/m2s), heat flux (10-20kW/m2), and saturated pressure (0.7-0.9MPa). The result shows that the local heat transfer coefficient of a micro-grooved surface was remarkably larger than that of a flat surface. The effect of
heat transfer enhancement using a grooved surface was especially notable in the nucleate boiling region.英語フィールド
Author：Akio OKAMOTO, Hirofumi ARIMA, Yasuyuki IKEGAMITitle：Boiling Heat Transfer Enhancement for Ammonia Using Micro-Grooved
Surface on Titanium Plate EvaporatorAnnouncement information:Kobe Steel Engineering Reports Vol: 60 Issue: 2 Page: 60-65An abstract：Small thermal energy conversion, such as ocean thermal energy conversion (OTEC), is being looked to as the new energy. As small thermal energy conversion cycles have low thermal efficiency, these systems use plate
type heat exchangers (PHE) for evaporators and condensers, and ammonia or an ammonia/water mixture as a working fluid. Since sea water is often used as the heat source for small thermal energy conversion, titanium is expected to become the main material for plates in PHEs for these systems because of its excellent corrosion resistance. Therefore, in order to improve the efficiency of plate evaporators for small thermal energy conversion, we propose using titanium plate with a micro-grooved surface for the plate evaporator.
Measurements were performed to determine the local boiling heat transfer coefficient for pure ammonia under forced convection on a micro-grooved surface and flat surface in a vertical evaporator in a range of mass flux (2-
7.5kg/m2s), heat flux (10-20kW/m2), and saturated pressure (0.7-0.9MPa). The result shows that the local heat transfer coefficient of a micro-grooved surface was remarkably larger than that of a flat surface. The effect of
heat transfer enhancement using a grooved surface was especially notable in the nucleate boiling region.