Efficient air source heat pump system with rapid defrosting function

Abstract

The invention provides an efficient air source heat pump system with a rapid defrosting function. The efficient air source heat pump system comprises a compressor, a four-way valve, a gas-liquid separator, an outdoor fin evaporator, an indoor heat exchanger and a first electromagnetic valve and further comprises a controller and a defrosting device. A first temperature sensor is arranged on the indoor heat exchanger; a second temperature sensor and a reversible fan are arranged on the air outlet side of the outdoor fin evaporator, and the reversible fan can rotate reversely and has an air suction working state and an air supply working state; a third temperature sensor and the defrosting device are arranged on the air inlet side of the outdoor fin evaporator; and the controller is connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first electromagnetic valve, the reversible fan and the defrosting device. The provided efficientair source heat pump system with the rapid defrosting function has three defrosting modes, the defrosting efficiency is high, energy saving and environmental protection are achieved, the defrosting time is reduced significantly, and the indoor thermal comfort degree is ensured effectively.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a high-efficiency air source heat pump system for rapid defrosting. Background technique [0002] The air source heat pump has the advantages of both cooling and heating, small footprint, energy saving, environmental protection, and convenience, and is favored by more and more people. However, the frosting problem is the main factor affecting the normal heating of heat pump units in winter, especially in the cold northern regions and the high humidity and cold south, which seriously restricts the development of air source heat pumps. [0003] There have been a lot of research on defrosting of air source heat pumps at home and abroad. The commonly used defrosting methods are reverse cycle defrosting and hot gas bypass defrosting. Therefore, it is necessary to control the defrosting method that can reduce the defrosting frequency as much as possible; the existing control defros...

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Problems solved by technology

However, its frosting problem is the main factor affecting the normal heating of heat pump units in winter, especially in the cold northern regions and the high humidity and cold south, which seriously restricts the development of air source heat pumps

[0003] There have been a lot of research on defrosting of air source heat pumps at home and abroad. The commonly used defrosting methods are reverse cycle defrosting and hot gas bypass defrosting. Therefore, it is necessary to control the defrosting method that can reduce the defrosting frequency as much as possible; the existing control defrosting methods mostly use the timing control method or the single temperature method, and the timing control method is to defrost within the corresponding time. The disadvantage is Unnecessary defrosting operations will cause unnecessary waste; the single temperature method is to use a temperature sensor to detect the surface temperature of the finned tube of the heat exchanger, and defrost according to the temperature setting, but once the temperature sensor is damaged, it is easy to cause errors. operation; and whether it is the timing control method or the single temperature method, the defrosting is often controlled after the frost is already very thick. If defrosting starts at a short time, it will consume more energy and put a heavy burden on the heat pump system, which is not conducive to energy saving and maintenance of the heat pump system

[0004] Moreover, the outdoor heat exchanger only frosts on the air inlet side at the initial stage of frost formation. Only when the frost layer accumulates thicker and thicker after repeated defrosting, it is possible to frost on the air outlet side of the heat exchanger. Therefore, usually when defrosting The temperature of the non-frosting side of the outdoor heat exchanger is higher than that of the frosting side, and the air near the non-frosting side rises after being heated and is not used for defrosting the frosting side, wasting energy; when the frost layer is thick, once The frost attached to the surface of the outdoor heat exchanger is melted, forming a gap with the outdoor heat exchanger, and the outdoor heat exchanger cannot transfer heat to the frost layer through heat conduction, and may eventually form an empty frost shell that is difficult to remove

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