Pressure control method of air conditioning system

Abstract

The invention discloses a pressure control method of an air conditioning system. The pressure control method comprises the following steps: S1, respectively comparing detected outdoor ambient temperature and exhaust pressure of a compressor with a preset temperature range and preset pressure, judging whether to reduce the exhaust pressure or not according to comparison results, and if so, starting the step S2; S2, reducing the rotational speed of an indoor fan during refrigeration and reducing the rotational speed of an outdoor fan during heating; S3, comparing detected degree of superheat of inhaled air or exhaust pressure with preset degree of superheat or preset exhaust pressure, judging whether to withdraw from the control of reducing the exhaust pressure or not according to the comparison results, and if so, starting the step S4; S4, stopping the reduction of the rotational speed of the indoor fan during refrigeration and stopping the reduction of the rotational speed of the outdoor fan during heating. Through the adoption of the pressure control method of the air conditioning system disclosed by the invention, the exhaust pressure of the system can be controlled within a certain range; furthermore, the method is low in cost and good in effects, and cannot impact the reliability of the air conditioning system.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a pressure control method for an air conditioner system. Background technique [0002] Because R22 refrigerant has a destructive effect on the atmospheric ozone layer, according to the Montreal Protocol, developed countries have begun to ban the use of R22 refrigerant, and some developing countries have also begun to gradually reduce or suspend the use of R22 refrigerant. At present, R410a refrigerant is internationally recognized as the most suitable new environmentally friendly refrigerant to replace R22 refrigerant, and does not damage the ozone layer. However, the operating pressure of R410a refrigerant is high, especially in the T3 working condition area (that is, the maximum temperature of the climate is 52 degrees Celsius), the ambient temperature is harsh, and the exhaust pressure of the R410a air conditioning system will be very high. High discharge pressure will increase the load ...

AI Technical Summary

Problems solved by technology

The cost of this method is high, the frequency conversion compressor is not yet mature in the T3 working condition, and the development and design are very difficult, and when the low frequency operation is performed, the cooling output of the air conditioner is reduced;

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