This article takes a 200 L and a 300 L small-volume household freezer as the research objects. After ap-propriate optimizations in the condenser design and capillary flow design,as well as obtaining a reasonable refrigerant charge amount through filling amount debugging and other adjustments,when comparing the R290 refrigeration system with the corresponding R600a system,the power consumption is basically the same. The freezing capacity is increased by approximately 70％,the cooling speed at a high ambient temperature of 43 ℃ is increased by approximately 45％,the average storage temperature of the compartments at a high ambient temperature of 43 ℃ is reduced by approximately 6 ℃,the noise level is slightly worse,and is approximately 2 dB(A) higher.
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