Electronic expansion valve control method and air source heat pump system
An electronic expansion valve, air source heat pump technology, applied in heat pumps, refrigerators, refrigeration components, etc., can solve problems such as the deterioration of compressor operating conditions and the reduction of system work efficiency, and achieve the goal of improving energy efficiency ratio and system energy efficiency ratio. Effect
Inactive Publication Date: 2017-06-20
DALIAN ZHONGXING TECH DEV
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Problems solved by technology
An inappropriate electronic expansion valve control algorithm will deteriorate the operating conditions of the compressor in the system, and even lead to a decrease in system efficiency, thus limiting the application of air source heat pumps in cold and severe northern regions
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[0041] An electronic expansion valve control method, the control method is applied to an air source heat pump system, the air source heat pump system includes a compressor, a main electronic expansion valve located in the compressor suction circuit, and a main electronic expansion valve The second heat exchanger between the valve and the suction end of the compressor, the control method includes the steps of: adjusting the opening of the main electronic expansion valve so that the suction superheat of the compressor reaches the first A target superheat; when the air source heat pump system is working in heating mode, the suction superheat of the compressor D1=T4-T3, where T3 is the refrigerant of the first heat exchanger in heating mode The inlet temperature and T4 are the suction temperature of the compressor; when the air source heat pump system is working in the cooling mode, the suction superheat of the compressor D1=T4-T6, where T4 is the suction temperature of the compress...
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The invention discloses an electronic expansion valve control method and an air source heat pump system. The control method includes the following steps that the air suction superheat degree of a compressor reaches a first target superheat degree by adjusting the opening degree of a main electronic expansion valve; when the air source heat pump system operates in a heating mode, the air suction superheat degree D1 of the compressor is equal to T4-T3, T3 refers to the refrigerating fluid inlet temperature of a first heat exchanger in the heating mode, and T4 refers to the air suction temperature of the compressor; and when the air source heat pump system operates in a refrigeration mode, the air suction superheat degree D1 of the compressor is equal to T4-T6, T4 refers to the air suction temperature of the compressor, and T6 refers to the refrigerating fluid inlet temperature of a second heat exchanger in the refrigeration mode. According to the electronic expansion valve control method and the air source heat pump system, the ultimate purpose lies in that the system can enter into the optimal operating state at a high speed, the pressure difference before and after before starting of the compressor is unloaded, and therefore excessively-high starting torque in the overloaded starting process of the compressor is prevented, and the problem that great impact on a power grid is caused due to an extremely-high starting current is avoided.
Description
Technical field [0001] The invention relates to an electronic expansion valve control method and an air source heat pump system. Background technique [0002] With the development of social economy, traditional coal-fired boiler heating methods are restricted by various aspects of energy and environment, and emerging heating methods have attracted attention. As one of the decentralized heating methods, the air source heat pump has the advantages of flexible installation, high efficiency and energy saving, and no emission pollution. It is widely used in the Yangtze River and Yellow River basins in my country. However, the air source heat pump uses outdoor air as the heat source. When the air temperature is low, it will face the problem of reduced heating capacity and heating performance coefficient, and may even fail to operate normally due to unreasonable control. [0003] In addition, during the application process of the air source heat pump system, the working conditions vary w...
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Patent Timeline
Login to View More IPC IPC(8): F25B30/02F25B41/06F25B49/02F25B13/00F25B43/00F25B41/04F25B41/20F25B41/34
CPCF25B13/00F25B30/02F25B43/006F25B49/02F25B41/22F25B41/31Y02B30/70
Inventor 初家平蒋爽张志刚
Owner DALIAN ZHONGXING TECH DEV