Air source heat pump water heater and defrosting method thereof

Abstract

The invention relates to an air source heat pump water heater. The air source heat pump water heater comprises a compressor, a four-way valve, a gas cooler, a throttle valve, an evaporator, a gas-liquid separator, a defrosting solenoid valve, a fan and a heater, wherein the compressor, the four-way valve, the gas cooler, the throttle valve, the evaporator and the gas-liquid separator form a circulation circuit, the defrosting solenoid valve and the throttle valve are connected in parallel, the heater is arranged on the outer surface of the evaporator and the fan capable of acting wind on the evaporator surface is located on one side of the evaporator, and a temperature detection device is arranged on a coil pipe of the evaporator, and the defrosting solenoid valve, the fan and the heater are connected with a controller. According to the air source heat pump water heater, purposeful defrosting work can be performed for frost with different thicknesses through an electric heater, the defrosting solenoid valve and the four-way valve, so that it is ensured that the air source heat pump water heater does not reduce the energy consumption while working, and the defrosting work can be realized step by step in an early stage of frosting.

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 on the surface of the evaporator coil also drops, even below 0°C. When the outdoor air flows into the coil under the drive of the fan, the moisture contained in it will precipitate and adhere to the surface of the coil to form a frost layer. At present, the more common defrosting method of air source heat pump is mainly to defrost through the four-way valve. Frost. The conventional four-way valve reversing defrosting is equivalent to the cooling operation of the unit, and the unit should produce hot water, but at this time it will produce cold water, which will reduce the water temperature in the user's water tank and cause energy waste. Especially when used in heating operation, it reduces ...

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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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