Dual-heat source water heater and control method thereof

Abstract

The invention discloses a dual-heat source water heater. The dual-heat source water heater comprises a heat pump system and a water side system, wherein the heat pump system comprises an electric motor, a draught fan, a heat pump heating subsystem, a pressure relief subsystem and a defrosting subsystem; the water side system comprises an electrical heating system, the electrical heating system comprises an MCU (Micro Controller Unit), a water inlet temperature sensor, a first temperature sensor, a second temperature sensor, a terminal block and an SCR (Silicon Controlled Rectifier) assembly, the water inlet temperature sensor, the first temperature sensor, the second temperature sensor, the terminal block and the SCR assembly are respectively and electrically connected with the MCU, the heat pump heating subsystem, the pressure relief subsystem and the defrosting subsystem are respectively, correspondingly and electrically connected with the MCU through a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, and the MCU is used for controlling the switching on and off of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve according to a water inlet temperature signal, a heat pump water outlet temperature signal, a total water outlet temperature signal and a water flow signal and controlling the power output of a heating element assembly through the SCR assembly. The invention also discloses a control method of the dual-heat source heater.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a dual heat source water heater and a control method thereof. Background technique [0002] The traditional air source heat pump water heater is generally composed of the host part and the water tank part. For household water tanks, the capacity is generally 150L to 320L, which is bulky and takes up a lot of space during installation, even if some water tanks are installed on the wall with brackets. In addition, due to the heavy weight of the water tank itself, this type of installation is dangerous; in addition, the materials and processes used in the inner tank of the water tank, whether it is stainless steel or enamel inner tank, are always unavoidable. Water leakage occurs, and in areas with poor water quality, the heat exchange tube inside the water tank is easily corroded and perforated, resulting in refrigerant leakage; furthermore, due to the characteristics of the water stor...

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Problems solved by technology

[0002] The traditional air source heat pump water heater is generally composed of the host part and the water tank part. For household water tanks, the capacity is generally 150L to 320L, which is bulky and takes up a lot of space during installation, even if some water tanks are installed on the wall with brackets. In addition, due to the heavy weight of the water tank itself, this type of installation is dangerous; in addition, the materials and processes used in the inner tank of the water tank, whether it is stainless steel or enamel inner tank, are always unavoidable. Water leakage occurs, and in areas with poor water quality, the heat exchange tube inside the water tank is easily corroded and perforated, resulting in refrigerant leakage; furthermore, due to the characteristics of the water storage heat pump, it takes less time to raise the water temperature to a higher temperature. Long, can not meet the demand for immediate water use, and in the late stage of water use, the water temperature fluctuates greatly, which affects the comfort of use; when using water, it is generally necessary to mix the water, the hot water usage rate in the water tank is not high, and the water temperature is not high during the heat preservation process. Avoided drop in, increased energy consumption

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