気相冷媒

US11892206(MITSUBISHI ELECTRIC CORP [JP])
[0052] <Performance of Distribution of Gas-Liquid Two-Phase Refrigerant in First Heat Exchanger 1 >
【００３２】
  ＜第１熱交換器１における気液２相冷媒の分配性能＞

[0053] In gas-liquid two-phase refrigerant, the specific gravity of gas-phase refrigerant is lower than the specific gravity of liquid-phase refrigerant.
気液２相冷媒中の気相冷媒の比重は、液相冷媒の比重よりも小さい。

Therefore, if distributor 10 distributes gas-liquid two-phase refrigerant to the first refrigerant flow path disposed relatively above and the second refrigerant flow path disposed relatively below,
そのため、分配部１０が気液２相冷媒を相対的に上方に配置された第１冷媒流路と下方に配置された第２冷媒流路とに分配し、

and the internal pressure loss of the heat transfer tubes forming the first refrigerant flow path is equal to the internal pressure loss of the heat transfer tubes forming the second refrigerant flow path,
かつ第１冷媒流路を構成する伝熱管の管内圧力損失が第２冷媒流路を構成する伝熱管の管内圧力損失と等しい場合、

the gas-phase refrigerant in the gas-liquid two-phase refrigerant flows in a greater amount through the second refrigerant flow path than through the first refrigerant flow path, and the liquid-phase refrigerant flows in a greater amount through the second refrigerant flow path than through the first refrigerant flow path.
気液２相冷媒中の気相冷媒は第１冷媒流路よりも第２冷媒流路に多く流れ、液相冷媒は第１冷媒流路よりも第２冷媒流路に多く流れる。

Accordingly, in the refrigerant flow path disposed above, the flow rate of the liquid-phase refrigerant becomes too low with respect to heat exchange capacity, resulting in an increased degree of overheating at the outlet.
これにより、上方に配置された冷媒流路では、液相冷媒の流量が熱交換能力に対して過少となり、出口の過熱度が高くなる。

In the refrigerant flow path disposed below, on the other hand, the flow rate of the liquid-phase refrigerant becomes too high with respect to heat exchange capacity, resulting in the liquid-phase refrigerant flowing out without completely evaporating.
一方、下方に配置された冷媒流路では、液相冷媒の流量が熱交換能力に対して過多となり、液相冷媒が完全に蒸発せずに流出する。

As a result, such a heat exchanger has reduced performance.
その結果、このような熱交換器の性能は低くなる。