Waste heat recovery type household air-source heat pump water heater and heating and defrosting method

Abstract

The invention discloses a waste heat recovery type household air-source heat pump water heater which comprises a compressor, a four-way valve, a water storage tank, an economizer, an electronic expansion valve, a first gas-liquid separator, a wastewater reservoir, a finned evaporator and a second gas-liquid separator, wherein the compressor is provided with an exhaust opening, an air suction opening and an air supply opening; the exhaust opening of the compressor is connected with an opening a of the four-way valve by virtue of a pipeline; the air suction opening of the compressor is connectedwith the second gas-liquid separator; the second gas-liquid separator is connected with an opening c of the four-way valve; a micro-channel heat exchanger is wound on a liner of the water storage tank; an opening b of the four-way valve is connected with the micro-channel heat exchanger by virtue of a pipeline. According to the water heater disclosed by the invention, heat energy in bathing wastewater and sanitary wastewater can be recovered by the wastewater heat exchanger, the energy waste problem is solved, the using cost is reduced, the heat energy is supplemented, and the problem that the air-source heat pump water heater is insufficient in heating, severe in frosting, and incomplete in defrosting, and even cannot be normally used in a low-temperature environment is solved.

Description

technical field [0001] The invention relates to the field of air energy heat pumps, in particular to a waste heat recovery type household air energy heat pump water heater and heating and defrosting methods thereof. Background technique [0002] With the improvement of living standards, the demand for hot water in family life is increasing. Common ways for households to obtain hot water mainly include solar water heaters, electric water heaters, gas water heaters, and air-energy heat pump water heaters that have appeared in recent years. Solar water heaters use vacuum tubes or flat plate collectors to convert solar radiation into heat to produce hot water, which has the advantages of safety, energy saving and environmental protection, but the production of hot water is greatly affected by the weather. Especially in winter and rainy weather, when the demand for hot water is large, the hot water is often insufficient due to the weather. In order to meet the domestic hot water...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a waste heat recovery type domestic air energy heat pump water heater and its heating and defrosting method, and recover the heat energy in bathing wastewater and domestic wastewater t

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