フロン12直接膨脹式冷却管の熱貫流率と有効長さについて

概要

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A study, on heat transfer coefficient and effective length of R12 cooling coil, was made and the following new formulas were presented. Some experiments on models and actual ref. chambers were carried out to assess the validity of the following formulas, and it was found that the formulas were agreed approximately with the results of experiments. 1. Heat transfer coefficient of R12 cooling coil i) 10℃≧room temp. >0℃ K=1.74(Δt/d)^0.25+1.96 ii) 0℃≧room temp. ≧-20℃ K=1.59(Δt/d)^0.25+1.53 2. Effective length of R12 cooling coil L=d/2(pfgΔi^2ΔP/(-C_1+0.216C_2+C_3)fωK^2Δt^2)^1/3 Moreover, the following points were confirmed experimentally. 3. The heat transfer coefficient of vertical coil differs little from that of horizontal one. 4. The heat transfer coefficient of coil is not affected by 0∼4mm thickness of frost on the surface of coil.
社団法人日本船舶海洋工学会の論文
1972-06-30