Prediction of Heat Transfer Performance of Air-cooled Condensers Using Alternative Refrigerants R123 and R134a instead of R11 and R12

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  • 代替冷媒R123およびR134aを用いた空冷凝縮器の伝熱性能の予測
  • ダイタイ レイバイ R123 オヨビ R134a オ モチイタ クウレイ ギョ

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Abstract

When refrigerants R11 and R12 are replaced by respective alternatives R123 and R134a in air-cooled condensers for invariable values of the heat exchange rate, inlet vapor temperature, logarithmic mean temperature difference, air-side equivalent heat transfer coefficient and inner tube diameter, the change of heat transfer area is predicted to be plus 5% for R123 and minus 2% for R134a, while that of mass flow rate to be plus 6～7% for R123 and minus 15～20% for R134a.

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