A field study on the application of cascade air source heat pump unit in Northwest China
Low temperature is the key factor that restricts the efficient operation and stable heating of air source heat pump in the northwest of our country,but cascade air source heat pump units have better adaptability to low temperature.In order to explore the engineering application effect of cascade air source heat pump unit in northwest China,this paper takes as an example the demonstration heating project which uses frequency converting-cascade air source heat pump in a government building in Haidong City,Qinghai Province to carry out field measurement and analyze the operation performance of the cascade air source heat pump unit under typical low temperature conditions,typical high temperature conditions and long-term operation conditions,as well as its environmental and economic benefits.The results show that under typical low temperature and typical high temperature conditions,the unit has the phenomena of"defrosting without frost"and frequent start-stop,and the average en-ergy efficiency of the system reaches 2.13 and 3.58 respectively.Under long-term operation conditions,the unit shows good long-term sustainable heating capacity and performance,and the average energy efficiency of the unit system reaches 2.62,exhibiting good environmental and economic benefits.Compared with traditional heating systems,the CO2 emission reduc-tion rate of the cascade air source heat pump unit is 57.2 kg/(a·m2),the SO2 emission re-duction rate is 0.46 kg/(a·m2),the dust emission reduction rate is 0.23 kg/(a·m2),and the heating cost saving is 44.2 Yuan/(a·m2).
northwest Chinacascade air source heat pumpoperating performancefield study
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