A kind of air conditioning system and control method suitable for high altitude area

Abstract

The invention discloses an air conditioning system applicable to high-altitude areas and a control method of the air conditioning system. The air conditioning system comprises an outdoor unit and at least one indoor unit, and one absolute pressure sensor used for measuring atmospheric pressure of the area where the air conditioning system is located is arranged on the outdoor unit and / or the indoor units; the air conditioning system performs modification on a high pressure value and a low pressure value according to absolute pressure measured by the absolute pressure sensor, and refrigerant superheat and supercooling and output capacity of a compressor are controlled according to the low pressure value and the high pressure value which are modified. By the air conditioning system and the control method, an atmospheric pressure value of the area where an air conditioner is located can be measured, parameters of target pressure, supercooling, superheat and the like of refrigerant in the air conditioning system can be modified, problems that the parameters of actual target pressure, supercooling and superheat in the air conditioning system are not controlled reasonably resulting in poor heating and cooling effects are effectively solved, operation effect and reliability of the air conditioning system are improved, and the air conditioning system and the control method of the same are applicable to large-sized promotion and use in the high-altitude areas.

Description

technical field [0001] The present invention relates to the field of air-conditioning system control, and more specifically relates to an air-conditioning system and a control method suitable for high-altitude areas. Background technique [0002] Air conditioning is air conditioning, which refers to the process of adjusting and controlling the temperature, humidity, cleanliness, speed and other parameters of the ambient air in the building / structure by artificial means. The structure of the air conditioner mainly includes: compressor, condenser, evaporator, Composed of four-way valve and one-way valve capillary assembly. [0003] The system pressure detected by the pressure sensor installed in the air-conditioning system in the prior art is relative pressure. Since the air-conditioning users are located in different areas and the altitudes of the air-conditioning installation areas are different, the actual absolute pressure of the refrigerant medium is different from the pr...

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Problems solved by technology

[0003] The system pressure detected by the pressure sensor installed in the air-conditioning system in the prior art is relative pressure. Since the air-conditioning users are located in different areas and the altitudes of the air-conditioning installation areas are different, the actual absolute pressure of the refrigerant medium is different from the pressure of the air-conditioning system. The large difference in pressure detected by the sensor will lead to deviations in the control process of the actual target pressure, subcooling degree, superheating degree and other parameters of the air conditioning unit during operation, resulting in poor cooling and heating effects and reducing the operating efficiency of the air conditioning system. reliability

[0004] At present, there is no function in the air-conditioning industry that can automatically detect the altitude of the installation location of the unit and perform corresponding pressure correction control. However, the relative pressure of the refrigerant medium detected by the unit is affected by the altitude, and the actual absolute pressure of the refrigerant medium changes. The higher the altitude, the greater the change in absolute pressure. If the air conditioning system still operates according to the control parameters of the low altitude area during the operation of the air conditioning system, the actual subcooling degree control will be too small and the frequency will be too high during cooling operation. ; while the actual superheat control is too small and the frequency is too low during the heating operation, resulting in poor operation of the air conditioning system and reduced reliability

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