Defrost method for air source heat pump system
An air source heat pump, heat storage technology, applied in lighting and heating equipment, damage protection, refrigeration components, etc., can solve problems such as reduced sealing performance, prolonged defrosting time, low pressure protection, etc., to ensure stable and reliable operation, improve Comfort and energy efficiency
Active Publication Date: 2016-05-11
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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Problems solved by technology
[0006] The disadvantage of this method of hot gas reversing defrosting is that during the defrosting period, because the four-way reversing valve 1 is reversing too quickly, a large amount of low-temperature liquid refrigerant flows back to the low-pressure side, and it is difficult to evaporate in a short time. It may also happen that the defrosting time is extended or the low pressure protection fails to defrost completely
At the same time, a large amount of low-temperature liquid refrigerant flows back into the gas-liquid separator and compressor 2, diluting the lubricating oil in compressor 2, resulting in reduced lubrication and sealing performance of bearings and other mechanical moving parts of compressor 2 , thereby increasing the risk of compressor 2 wear or even damage
Method used
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[0037] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.
[0038] In order to provide a thorough understanding of the present invention, the detailed structure will be set forth in the following description. It is evident that the practice of the invention is not limited to specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments besides these detailed descriptions.
[0039] The invention discloses a defrosting method for an air source heat pump system, the flow chart of which is as fol...
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The invention discloses a defrosting method used for an air source heat pump system. The defrosting method includes the following steps: S101, judging whether the air source heat pump system meets conditions for performing the process of defrosting and heat storing or not; S103, if yes, entering the process of defrosting and heat storing; S105, judging whether the air source heat pump system meets the conditions for stopping the process of defrosting and heat storing or not; S107, if yes, stopping the process of defrosting and heat storing; S109, enabling the air source heat pump system to enter the process of defrosting. According to the defrosting method, quantity of a liquid refrigerant back-flowing towards a low-pressure side in the process of defrosting can be reduced, the back-flowing liquid refrigerant can be enabled to be evaporated more quickly, parts on a high-pressure side can be enabled to store more heat before defrosting, speed of heat regenerating after defrosting can be increased, and normal running of a compressor is facilitated.
Description
technical field [0001] The invention relates to the technical field of air source heat pump systems, in particular to a defrosting method for an air source heat pump system. Background technique [0002] The air source heat pump system absorbs low-grade heat energy from the outdoor environment during heating, and then transports the heat indoors to meet people's needs for heating in winter and using hot water. When the surface temperature of the heat exchanger is lower than 0°C, the moisture in the air will condense into frost on the surface of the heat exchanger. The formed frost layer not only affects the heat transfer, but also makes the air flow section smaller and increases the air resistance. , and even completely block the passage of air circulation, resulting in the inability of the air source heat pump system to continuously heat. Therefore, when the air source heat pump system is used in winter, defrosting control is a very important link. At present, the most co...
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IPC IPC(8): F25B47/00
Inventor 刘峰王林忠童春辉顾中华
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC