Solar energy-air heat pump water heater

Abstract

The present invention relates to a solar-air heat pump water heater, including a solar-air evaporator, a hot-water tank containing submerged condenser coil, a small heat pump compressor and related refrigerating fittings of thermodynamic expansion valve, gas-liquid separator, drying filter and liquid storage device. The solar-air evaporator is formed from the components of solar heat-collecting plate, air conditioning fan, air vent and shell body. The solar heat collector and air heat-exchanger are combined together by adopting compact structure form. The automatic control device of the water heater includes a temperature difference controller for controlling starting and stopping of the fan and a water tank constant temperature device for controlling starting and stopping of compressor.

Description

Technical field: [0001] The invention relates to a solar-air heat pump water heater, in particular to a novel all-weather heat pump water heater improved on a direct expansion solar heat pump water heater, and belongs to the technical field of energy heating. Background technique: [0002] At present, the water heater products generally sold in my country's water heater market are electric water heaters, gas water heaters and solar water heaters. Among them, electric water heaters consume a large amount of expensive electricity, which is not conducive to the rational use of energy; gas water heaters have serious safety hazards in use, and poisoning incidents caused by the use of gas water heaters are reported from time to time every year; conventional solar energy Water heaters can't produce hot water in rainy days, and can only rely on electric heating to make up for the lack of solar energy, so there is also a waste of energy, especially in some southern regions where ther...

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Problems solved by technology

However, the above-mentioned patents still do not solve the problem of stability and high efficiency of the solar heat pump water heater at night or under the condition of weak solar radiation, because in this case, the ordinary solar evaporator plate only relies on the natural convection heat transfer from the surface The heat absorbed in the surrounding air is very limited, which leads to a sharp drop in the evaporation temperature, and the heat pump COP is also reduced, which is far lower than that of the air heat pump water heater under the same working conditions.

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