A 3P variable frequency air source heat pump unit was developed and applied in a residential building with floor radiant heating.The system was tested during the winter overa 93 d period.The range of the outdoor environment temperatures was-10 ℃ to 16 ℃,with the average value being 3.72 ℃.The heat capacity of the heat pump was 3.82 to t0.06 kW,with the average value at 6.71 kW.The average suction and discharge pressures were 0.55 and 2.28 MPa,respectively,and the compression ratio of the system was small.The energy efficiency ratio (EER) range was 2.32 to 4.71,and the average value of EER was 3.46,indicating a high level of energy efficiency.The temperatures at the height of 0.1,1,1.5,and 2 m were measured indoors,and the average values were 20.48,19.26,18.75,and 18.01 ℃,respectively;therefore,the temperature field was comfortable because of the negative gradient.The results in the warmest day and coldest day were compared and it is indicated that the average outdoor temperature difference in the two days was 17.21 ℃,and that the heating capacity and EER in the warmest day were 41.9％ and 159％ of those in the coldest day,respectively.The system showed good environmental adaptability and comfort.Compared with an urban central heating system and a gas-fired boiler heating system,the operating costs were reduced by 39.82％ and 56.17％,respectively,and the energy efficiency,safety,and thermal comfort were improved.%本文研发了3P变频单元式空气源热泵机组,进行了民宅地板辐射供暖系统设计和冬季93 d的供暖应用实验.期间室外环境温度的变化范围-10 ～16℃,平均值3.72℃;热泵机组制热量变化范围3.82～10.06 kW,平均值6.71 kW;热泵压缩机的吸/排气压力的平均值为0.55 MPa/2.28 MPa,压缩比小;EER变化范围2.32 ～4.71,平均值3.46,能效较高.测试了室内0.1、1、1.5、2m高度处的温度,平均值分别为20.48、19.26、18.75、18.01℃,呈现相对稳定的下暖上凉的温度场.进行了最暖、最冷2个典型气象日热泵系统运行性能的对比分析,两日室外的平均温差为17.21℃,最暖日制热量和EER分别是最冷日的41.9％和159％,室内温度相对稳定,表明热泵系统具有良好的环境适应性和舒适性.与城市集中供暖及燃气锅炉供暖相比,运行费用分别降低39.82％、56.17％,节能、安全、热舒适性更佳.
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