This study investigates the optimal refrigerant flow path for a fin-tube heat exchanger used in the indoor unit of a mini VRF heat pump. Optimal circuitry can significantly enhance the performance of fin-tube heat exchangers. Its performance according to various refrigerant circuitry is evaluated by the developed finite-element-calculation simulation model. The refrigerant circuitry was optimized by maximizing the heat transfer rate for given refrigerant and air conditions during cooling and heating seasons by adopting an optimization algorithm. A four-circuit circuitry has a higher capacity than the six-circuit circuitry and two-circuit circuitry because of the balancing effect of pressure drop and heat transfer. The best circuitry, which contains split/merge tubes, has a higher capacity and a significant pressure drop reduction compared to the two-circuit circuitry. It is found that compared to the reference circuitry, the best circuitry for the indoor unit of the heat pump has a 13 % increase in capacity.

本研究研究了迷你 VRF 热泵室内机中使用的翅片管热交换器的最佳制冷剂流动路径。优化的电路可以显着提高翅片管热交换器的性能。通过开发的有限元计算仿真模型评估其根据各种制冷剂回路的性能。通过采用优化算法，在制冷和制热季节给定制冷剂和空气条件下最大化传热率，从而优化制冷剂回路。由于压降和传热的平衡作用，四回路回路比六回路回路和两回路回路具有更高的容量。与两回路电路相比，包含分流/合并管的最佳电路具有更高的容量和显着的压降降低。结果发现，与参考电路相比，热泵室内机的最佳电路的容量增加了13%。