Growing number of household refrigerators and freezers also increase the overall energy consumption and number of household refrigerators have grown nearly 3% per year. On the other hand, investigations showed that household refrigerators have a significant technical energy saving potential of up to 30–40%. In this study, a single-phase natural circulation loop is considered as a suction line heat exchanger between the high and low pressure sides of conventional refrigeration cycle of a household chest freezer. The potential heat transfer by the single-phase natural circulation loop is studied by a CFD analysis, considering the possible temperature range for refrigeration cycle and geometrical parameters that affect the loop performance. The performance map of this refrigeration cycle is presented for different compressor suction and discharge pressures (LP/HP), discharge temperatures (T₂) and different compressor speeds. The results indicate that the highest amount of heat transfer is obtained for the single-phase natural circulation loop with aspect ratio of 0.8 and pipe diameter of 6.53 mm. Moreover, the single-phase natural circulation loop provides 11.5% efficiency improvement for the household freezer for maximum compressor speed at lowest T₂ and LP/HP. Considering reduction in required compressor work, SPNCmL assisted refrigeration system has a wider operating range.

家用冰箱和冰柜数量的增加也增加了整体能耗，家用冰箱的数量每年增长近3％。另一方面，调查显示，家用冰箱具有高达30％至40％的重大技术节能潜力。在这项研究中，单相自然循环回路被认为是家用冷冻柜常规制冷循环的高压侧和低压侧之间的吸入管线热交换器。考虑到制冷循环的可能温度范围和影响循环性能的几何参数，通过CFD分析研究了单相自然循环循环的潜在传热。₂）和不同的压缩机转速。结果表明，单相自然循环回路的纵横比为0.8，管径为6.53 mm，传热量最大。此外，单相自然循环回路可使家用冷冻机的效率提高11.5％，从而在最低T ₂和LP / HP时实现最大压缩机速度。考虑到减少所需的压缩机工作量，SPNCmL辅助制冷系统的工作范围更广。