Operating performance analysis on heating conditions of sewage source heat pumps

Obtains the changing range of sewage temperature, the actual energy efficiency ratio of heat pump system and the inlet and outlet temperatures of evaporator and condenser in winter by monitoring a sewage source heat pump system in Tianjin. Analyses the performance difference between sewage source heat pumps and water source heat pumps by comparing with the data given in some heat pump specifications. Presents the problems existed and gives corresponding suggestions.