April 25, 2022
The company has developed a control method and control device for direct heating dual source heat pump water heater, which relates to a fluid heater with solar collector and using heat pump and its control method. The control device detects the outlet water temperature of solar water heater and changes the temperature control strategy according to the outlet water temperature. When the water temperature is in the first water temperature control range, the operating frequency of direct heating variable frequency heat pump is adjusted to change the heating capacity of heat pump and control the water temperature; When the water temperature is in the second water temperature control range, control the water temperature by changing the make-up water speed of the make-up water flow regulating element, make full use of the accumulated heat of solar energy, save the heating time of heat pump in the sunshine intensity reduction period before and after sunset, adapt to different sunshine intensity, give priority to and make full use of solar energy, the unit has low inlet water temperature, high operation efficiency, safety and reliability, and can avoid high-voltage protection of the unit due to high outlet water temperature; It can meet the hot water supply, reduce the power requirements of the compressor, improve the utilization rate of the equipment and reduce the early investment cost.
