エジェクタを用いた冷媒再循環によるプレート式蒸発器の伝熱促進と分配改善

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  • Improvements of Heat Transfer and Refrigerant Distribution in Plate-type Evaporator by Vapor Re-circulation Using an Ejector
  • エジェクタ オ モチイタ レイバイ サイジュンカン ニ ヨル プレートシキ ジョウハツキ ノ デンネツ ソクシン ト ブンパイ カイゼン

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We proposed a new method to enhance the average evaporating heat transfer coefficient ( αr) in the refrigeration cycle. This new method is to re-circulate the vapor refrigerant from the evaporator outlet to the inlet by using an ejector. The αr is improved by increasing the vapor quality and the mass flow rate of refrigerant at the evaporator inlet. In this study, experiments were performed to evaluate the effectiveness of the proposed method utilizing plate-type evaporators and refrigerant R404A. The αr in evaporators with 10 and 50 plates was measured under different mass velocity (m0) conditions. The coefficient of performance (COP) was also measured. The αr in the vapor refrigerant re-circulated evaporator improves 1.5 times or more compared with the conventional evaporator and is improved by increasing the m0. The refrigerant distribution in an evaporator with 50 plates is improved compared with that the αr in the evaporator with 10 plates. It is also found that the COP in the refrigeration cycle with the vapor refrigerant re-circulated evaporator improves as compared with the conventional cycle by the fact that the effect of improved αr was larger than the influence of increased pressure loss.

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