Defrosting control method and air source heat pump system

A control method and technology for air temperature, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as false defrosting failure, threatening the safe operation of the unit, energy loss, etc., and achieve accurate judgment, simple structure and low cost. Effect

Inactive Publication Date: 2019-04-19
QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER
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Problems solved by technology

[0003] In order to solve the technical problems of inaccurate judgment of defrosting conditions for existing air source heat pumps, prone to false defrosting faults, resulting in energy loss, and threatening the safe operation of the unit, the present invention proposes a defrosting control method that can solve the above problems

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  • Defrosting control method and air source heat pump system
  • Defrosting control method and air source heat pump system

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Embodiment 1

[0024] Embodiment 1. When the air source heat pump is in heating operation under the condition of low ambient temperature in winter, frost usually forms on the surface of the finned tubes of the evaporator. During the frosting process, the distribution of the frost layer on the surface of the finned tubes and the The temperature of the finned tube is related to the temperature of the surface of the finned tube and the flow and heat transfer characteristics of the low-temperature refrigerant in the tube. Studies have shown that when the cold and low temperature refrigerant flows in the tube, the pressure of the refrigerant will gradually decrease due to the frictional resistance of the tube wall. The influence of frictional pressure drop is very large, and the change of refrigerant flow rate is related to the gas-liquid ratio of refrigerant. The larger the proportion of liquid (the greater the mass), the smaller the refrigerant flow rate (usually between 0.5-1.0m / s ), with the ...

Embodiment 2

[0048] Embodiment 2, this embodiment proposes a heat pump system, which can be used as an air conditioning system, and can also be used in a heat pump water heater. The heat pump system of this embodiment includes a compressor and an evaporator, such as figure 2 As shown, the evaporator includes fins 12 and coiled tubes 11 fixed on the fins 12, and a fan (not shown in the figure) is also arranged on one side of the fins 12 and the coiled tubes 11, and the fins 12 and the coiled tubes 11 are perpendicular to each other to form finned tubes. The fan is located on one side of the fins 12 and the coiled tube 11. When the fan is running, the air sucked flows through the finned tube structure, exchanging heat with the low-temperature refrigerant in the coiled tube 11, and evaporates when the system is heating. The flow direction of the refrigerant in the evaporator is shown by the arrow in the figure. The first temperature sensor 13 is set at the position close to the refrigerant in...

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Abstract

The invention discloses a defrosting control method and an air source heat pump system. The defrosting control method comprises the following steps that (1) the air temperature Ts and the ambient temperature Th close to the refrigerant inlet position of an evaporator are detected; (2), and the difference value between the air temperature Ts and the ambient temperature Th detected at the same moment are calculated; and (3) if the difference value in the step (2) is not smaller than a first set threshold value, the system enters a defrosting process, and otherwise, the system operates a heatingprocess. The defrosting judgment mechanism of the defrosting control method is based on the growth characteristics and the distribution rule of a frost layer in the frosting process of the evaporator,the judgment is accurate, and the " on-demand defrosting " can be realized, the phenomenon that an existing double-temperature sensor method frequently occurs false defrosting in a cold drying environment is avoided, the energy efficiency ratio and reliability of system operation are greatly improved; and compared with defrosting control methods such as laser detection and photoelectric conversion, the method and the system are simple in structure, low in cost, and popularization and use in combination with an existing air source heat pump system is very easy.

Description

technical field [0001] The invention relates to the field of heating, ventilating and air-conditioning heat pumps, in particular to a defrosting control method and an air source heat pump system applied to the control method. Background technique [0002] When the air source heat pump is running in winter, the outdoor heat exchanger usually frosts. When the frost layer reaches a certain thickness, the heat exchanger needs to be defrosted. At present, the most widely used defrosting method is indoor / outdoor Dual temperature-time method, this method is simple, cheap, and easy to implement, but it is often used in cold and dry conditions (such as North China), but accidental defrosting accidents often occur. Research shows that under this condition, "no frost" "Defrosting" accidents accounted for as high as 70% of the total number of defrosting times, resulting in a significant loss of the effective heat supply of the system, a sharp drop in COP, and a threat to the safe operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/00F25B49/02
CPCF25B47/00F25B49/02F25B2600/01F25B2700/02
Inventor 赵洪运高本法庄长宇蒋建平彭海燕
Owner QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER
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