WATER CHILLER-HEATER UNIT OF AIR COOLED HEAT PUMP AND DEFROSTING CONTROL METHOD THEREFOR

摘要

Provided are a water chiller-heater unit of an air cooled heat pump and a defrosting control method therefor. The water chiller-heater unit of the air cooled heat pump comprises: N modular units (100), water outlet pipes of the modular units (100) being separately connected to a total water inlet pipe of the water chiller-heater unit of the air cooled heat pump, so as to realize parallel connection of the N modular units (100), N being an integer greater than 2; a first temperature detection module, used for detecting an outdoor environment temperature (T4); an acquisition module, used for acquiring running parameters of each modular unit (100); and a control module, used for determining, according to the outdoor environment temperature (T4), whether to control the water chiller-heater unit of the air cooled heat pump to run in an alternate defrosting manner when the water chiller-heater unit of the air cooled heat pump enters a defrosting mode. The defrosting control method for the water chiller-heater unit of the air cooled heat pump comprises: the water chiller-heater unit of the air cooled heat pump runs in an alternate defrosting manner, and a control module controls at least one of N modular units (100) to be started, keeps at least one of the N modular units (100) in a stop state, controls, according to an outdoor environment temperature (T4) and running parameters of any of the started modular units (100), any of the started modular units (100) and any of the modular units (100) in the stop state to run in an alternate heating manner, and keeps a fan (10) in any of the started modular units (100) and a fan (10) in any of the modular units (100) in the stop state to run continuously, so as to defrost by means of forced-convection heat transfer of the fans (10).