Method and system for controlling superheat degree of air-conditioning equipment

Abstract

The invention discloses a method for controlling superheat degree of air-conditioning equipment, which comprises the following steps: detecting compressor suction pressure P1, compressor suction temperature T1, compressor bottom temperature Td and outdoor environment temperature Th; calculating Tb, DeltaTx and DeltaTd; judging whether Th is smaller than or equal to 0 DEG C, and if so, setting the target suction superheat degree DeltaTm as a first target value, wherein the first target value is -1 DEG C to 1 DEG C; and judging whether DeltaTd is smaller than 10 DEG C, if so, giving an alarm, and if not, adjusting the opening of the electronic expansion valve according the magnitudes of DeltaTx and DeltaTm. The practice proves that the suction superheat degree of the invention is 0-1 DEG C when the outdoor environment temperature is smaller than or equal to 0 DEG C, thereby avoiding the phenomenon of carbon deposition due to overhigh exhaust temperature; only when the compressor bottom superheat degree is greater than or equal to 10 DEG C, the invention adjusts the opening of the electronic expansion valve, thereby still preventing the compressor from liquid slugging in practice when the suction superheat degree is 0-1 DEG C. The invention also discloses a system for controlling superheat degree of air-conditioning equipment.

Description

technical field [0001] The present invention relates to the technical field of air-conditioning equipment, and more specifically, to a method and system for controlling superheat of air-conditioning equipment. Background technique [0002] In air-conditioning equipment, the method of controlling the suction superheat of the compressor is usually used to adjust the opening or closing of the electronic expansion valve inside the air-conditioning equipment, so that the equipment can operate normally. Generally, when the actual suction superheat is greater than the target suction superheat, the opening of the electronic expansion valve increases; when the actual suction superheat is lower than the target suction superheat, the opening of the electronic expansion valve decreases; the actual suction superheat When it is equal to the target suction superheat degree, the opening degree of the electronic expansion valve remains unchanged. [0003] In the prior art, the target suctio...

AI Technical Summary

Problems solved by technology

Because the exhaust temperature of air-conditioning equipment using R32 refrigerant is 10 degrees Celsius higher than that of R410A refrigerant, if the above superheat control method is adopted, when the air-conditioning equipment is used at an ambient temperature below 0 The air temperature is too high, resulting in carbon deposits in the compressor and unable to operate, thereby reducing the operating range of the air conditioner

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