In this study, a microchannel flat-tube condenser was introduced to a domestic freezer, and experiments were conducted to investigate the dynamic characteristics of the system at different ambient temperatures. Based on the dynamic variations of temperature in the main components, the refrigerant migration during the compressor-off stage and cooling output performance during the compressor-on stage were analyzed. The results show that the time proportion of the no-cooling output stage increased from 4.9% to 7.3%, while that of the refrigerant migration decreased from 25.6% to 21.2%, and energy consumption for no-cooling output stage increases from 0.0016 kW·h to 0.0023 kW·h as the ambient temperature increased from 16 °C to 32 °C. In addition, the freezer was compared to a system with a traditional circular tube condenser. The results show that the microchannel heat exchangers could contain more refrigerant charge due to the multi-channel structure during the compressor-off stage, weakening the “evaporative cooling” effect and reducing the migration loss. Therefore, the microchannel flat-tube condenser exhibited better stability at different ambient temperatures. The results of this study elucidate dynamic characteristics and advantages of applying a microchannel flat-tube condenser to a freezer, and provide a direction for reducing the energy consumption of a domestic freezer.

本研究将微通道扁管冷凝器引入家用冷柜，并通过实验研究了系统在不同环境温度下的动态特性。基于主要部件温度的动态变化，分析了压缩机停机阶段的制冷剂迁移和压缩机启动阶段的制冷输出性能。结果表明，无冷输出级的时间占比从4.9%提高到7.3%，制冷剂迁移时间占比从25.6%下降到21.2%，无冷输出级能耗从0.0016 kW·增加。随着环境温度从 16 °C 增加到 32 °C，h 增加到 0.0023 kW·h。此外，将冷冻机与具有传统圆管冷凝器的系统进行了比较。结果表明，微通道换热器由于在压缩机停机阶段采用多通道结构，可以容纳更多的制冷剂充注量，削弱了“蒸发冷却”效果，减少了迁移损失。因此，微通道扁管冷凝器在不同环境温度下表现出更好的稳定性。本研究结果阐明了微通道扁管冷凝器应用于冷柜的动态特性和优势，为降低家用冷柜的能耗提供了方向。微通道扁管冷凝器在不同环境温度下表现出更好的稳定性。本研究结果阐明了微通道扁管冷凝器应用于冷柜的动态特性和优势，为降低家用冷柜的能耗提供了方向。微通道扁管冷凝器在不同环境温度下表现出更好的稳定性。本研究结果阐明了微通道扁管冷凝器应用于冷柜的动态特性和优势，为降低家用冷柜的能耗提供了方向。