This paper proposes the experimental investigation of a vapour compression refrigerator working as the water chiller (VCR-chiller) influenced by the expansion devices. The comparative cooling performance is implemented based on the transient operation (parameters of interest as a function of time). The expansion devices, thermostatic expansion valve (TEV), needle valve (NEV) and capillary tube (CT), are investigated under the same condenser, evaporator and compressor. The external performance parameters (cooling temperature, cooling load, electricity consumption, and COP) influenced by the expansion devices are assessed. The internal performance parameters (refrigerant temperature, refrigerant pressure and refrigerant mass flow rate), which indicate the flow state of the refrigerant, are also used to assess the deep impact of the expansion devices on the cooling performance. It is found that the cooling performance of VCR-chiller is strongly influenced by the expansion devices. The highest possible COP based on transient operation is achieved when using NEV while that produced by TEV is not much lower than NEV. However, using CT provides the lowest COP due to an uncontrollable refrigerant mass flow rate and its own characteristics. The findings indicate that attention must be paid to the selection of the expansion device for the VCR-chiller.

本文提出了一种受膨胀装置影响的水冷式制冷机（VCR-chiller）的蒸气压缩式制冷机的实验研究。比较冷却性能基于瞬态运行（感兴趣的参数随时间变化）实现。在同一冷凝器，蒸发器和压缩机下，对膨胀装置，恒温膨胀阀（TEV），针形阀（NEV）和毛细管（CT）进行了研究。评估了受扩展设备影响的外部性能参数（冷却温度，冷却负荷，电耗和COP）。表示制冷剂流动状态的内部性能参数（制冷剂温度，制冷剂压力和制冷剂质量流量），还用于评估扩展设备对冷却性能的深远影响。发现VCR冷却器的冷却性能受扩展设备的强烈影响。使用NEV时，可实现基于瞬态运行的最高COP，而TEV产生的COP则不会比NEV低很多。但是，由于无法控制的制冷剂质量流量及其自身特性，使用CT可以提供最低的COP。研究结果表明，必须注意选择VCR冷却器的膨胀装置。由于无法控制的制冷剂质量流量及其自身特性，使用CT可以提供最低的COP。调查结果表明，必须注意选择VCR冷却器的膨胀装置。由于无法控制的制冷剂质量流量及其自身特性，使用CT可以提供最低的COP。研究结果表明，必须注意选择VCR冷却器的膨胀装置。