Experimental study on operating characteristics of low temperature air source heat pump in rural areas of cold region
In order to obtain the actual operating characteristics of low-temperature air source heat pumps in cold northern regions,a 3-day heating condition measurement was conducted on an air source heat pump unit installed in a typical rural residential area of Baoding City,Hebei Province.Analyze the test data and obtain the following results:there is a significant difference between the measured outdoor operating conditions and the rated operating conditions of the unit.The main reason for the average heating capacity and average COP of the unit being higher than the rated value is that the outdoor tempera-ture is higher than the outdoor dry bulb temperature under the rated operating conditions of the unit.The average heating capacity of the unit under winter rainy and snowy weather conditions and the average COP without defrosting decreased by 60.7%and 53.4%respec-tively compared to sunny weather conditions,reflecting that the heating effect of the unit under rainy and snowy weather conditions is not as good as that under sunny weather con-ditions.The research results indicate that the low-temperature air source heat pump unit can meet the basic heating needs in winter,and the difficulty in reaching the heating set temperature indoors is caused by unit defrosting,frequent compressor shutdowns,and poor building insulation performance.
low temperature air source heat pumpsheating supplycold regionoper-ating characteristics
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