Air source heat pump water heater and its defrosting method

Abstract

The invention relates to an air source heat pump water heater, which includes a compressor, a four-way valve, a gas cooler, a throttle valve, an evaporator and a gas-liquid separator, a compressor, a four-way valve, a gas cooler, a throttle valve, an evaporator The device and the gas-liquid separator constitute a circulation loop, which also includes a defrosting solenoid valve, a fan and a heater, the defrosting solenoid valve is connected in parallel with the throttle valve, the outer surface of the evaporator is provided with the heater and the fan is located One side can make the wind act on the surface of the evaporator, and the coil of the evaporator is provided with a temperature detection device, and the defrosting solenoid valve, fan and heater are connected with the controller. The air source heat pump water heater provided by the present invention uses an electric heater, a defrosting solenoid valve and a four-way valve to perform purposeful defrosting work for frost of different thicknesses, thereby ensuring that the air source heat pump water heater does not reduce energy consumption during operation, And in the early stage of frosting, the work of gradually defrosting can be realized.

Description

technical field [0001] The invention relates to the technical field of air source heat pumps, in particular to an air source heat pump water heater and a defrosting method thereof. Background technique [0002] When the air source heat pump unit is in heating operation, the temperature of the evaporator coil surface also drops, even lower than 0 °C. When the outdoor air flows into the coil under the drive of the fan, the moisture contained in it will separate out and adhere to the surface of the coil to form a frost layer. Frost. The conventional four-way valve reversing defrosting is equivalent to the unit performing the cooling condition, and the unit should be producing hot water, but cold water will be produced at this time, which will reduce the water temperature in the user's water tank, and will also cause energy waste. Especially when used for heating operation, it will reduce the indoor ambient temperature. [0003] Therefore, it is necessary to provide a defrost...

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Problems solved by technology

[0004] The purpose of the present invention is to propose an air source heat pump water heater and its defrosting method, which can solve the problem of reducing the water temperature in the user's water tank or the indoor ambient temperature when the four-way valve is reversing to defrost in the prior art

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