A control method for an air conditioning system

Abstract

The invention provides a control method of an air conditioning system. The control method of the air conditioning system includes a detection step: detecting if a running mode of the air conditioningsystem is a heating mode or a defrosting mode, and detecting T<inlet> of an inlet pipe and T<outlet> of an outlet pipe of a heat accumulation module and defrosting time t<defrosting> of the air conditioning system, further includes a judging step: judging if the T<inlet> and the T<outlet> under the heating mode are both less than T1, and judging if the defrosting time t<defrosting> under the defrosting mode is larger than t2, wherein the T1 and the t2 are both constants; and further includes a control step: controlling a forth throttling deice to adjust the opening degree to the maximum step number according to a result obtained in the judging step, or controlling a control system to enter a common inner unit defrosting mode when judging out that fault exists in the heat accumulation module. The control method of the air conditioning system can effectively and accurately judge out if the heat accumulation module breaks down, prevents the situation that the air conditioning unit cannotnormally defrost due to the fact that heat accumulation module breaks down from occurring, guarantees continuous proceeding of defrosting, and maintains reliable and stable running of the system.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a control method of an air conditioning system. Background technique [0002] The problem of frosting and defrosting of air source heat pumps is a key technical issue of air conditioning, which has a significant impact on heating performance and comfort. The total area of ​​hot summer and cold winter areas, cold areas and severe cold areas accounts for about 85% of the total area of ​​the country. These areas need heating in winter, and most of them will experience frost and defrost during heating in winter. [0003] Traditional heat pump air conditioners use a four-way valve reversing defrosting method during heating operation in winter. This method is simple to operate, but has the following disadvantages: 1. The indoor temperature fluctuates greatly and the thermal comfort is poor. 2. The temperature rises slowly. The frequency increase of the compresso...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that failure of the thermal storage module during the defrosting period of the air conditioner will cause the unit to fail to defrost normally, and further cause the unit to be abnormal, thereby providing a control method for the air conditioning system

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