Abstract：

Analyses the operation characteristics of water-source heat pump units in variable conditions. Taking Chongqing and Chengdu as examples, calculates the capacity of actual cooling/heating capacities provided by the heat pump units selected using the monthly mean water temperature in the case of temperature changing throughout the year. Considering the characteristics of hourly air conditioning cooling/heating load for office buildings, hotel buildings and shopping malls, analyses the relationship between the building demand and cooling/heating capacity under the most adverse temperature. By analysing the non-guaranteed hours and guarantee rates of water-source heat pump in annual cooling and heating periods, gives the reasonable design value of intaking water temperature.