Abstract: In the refrigeration and air-conditioning sector, R32 refrigerant is regarded as an alternative environmentally friendly refrigerant due to its excellent thermal properties and environmental performance, and has garnered increasing attention and application. Based on experiments, the operating conditions of household dehumidifier employing R32 refrigerant under various parameter circumstances were investigated and analyzed. The findings indicate that an appropriate refrigerant charging amount, capillary flow rate, and fan speed are more conducive to enhancing the dehumidification capacity and EF value of the dehumidifier; moreover, a mathematical regression model was established to correlate the EF value with the refrigerant charging amount, capillary flow rate, and fan speed, and in combination with variance analysis, it was suggested that the capillary flow rate is the most significant factor influencing the EF value. Relevant research workwill help provide reference and valuable guidance for the optimized design of household dehumidifiers in the future.

Key words: R32 refrigerant, Household dehumidifier, Energy efficiency ratio EF, Variance analysis