Air conditioning system and control method thereof

Abstract

The invention discloses an air conditioning system and a control method thereof. The air conditioning system comprises an outdoor unit and an indoor unit. The indoor unit comprises a first electronic expansion valve, a front heat exchanger, a second electronic expansion valve and a rear heat exchanger which are sequentially connected in series. The control method includes the following steps that the temperature difference value between the indoor environment temperature and a set temperature is acquired when a constant temperature dehumidification instruction is received, and the temperature difference value is judged; the air conditioning system is controlled to enter in a constant temperature dehumidification mode when the temperature difference value is smaller than a first temperature threshold value, and the outlet superheat degree of the rear heat exchanger and the front end supercooling degree of the second electronic expansion valve are acquired; and the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind gear of an inner draught fan are adjusted according to the outlet superheat degree of the rear heat exchanger, the temperature difference value and the front end supercooling degree of the second electronic expansion valve. By the adoption of the control method, it is guaranteed that frequent machine starting and stopping can be avoided while the indoor temperature and humidity meet the requirements, so that comfort is improved, and it is also guaranteed that the air conditioning system can save energy.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system control method and an air conditioning system. Background technique [0002] Dehumidification is a seasonal demand in the area south of the Yangtze River in my country. During the rainy season in spring every year, the air temperature is not high, but the humidity is high. Condensation is easy to appear on the walls, floors and furniture surfaces, which requires dehumidification through the air conditioning system. [0003] When the existing dehumidification technology solves this dehumidification demand, it usually reduces the air supply speed of the air conditioner internal unit or reduces the caliber of the throttle valve, thereby reducing the evaporation temperature, reducing the apparent latent heat ratio, and achieving the purpose of dehumidification. However, this solution reduces the output capacity of the system while dehumidifying, th...

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Problems solved by technology

However, this solution reduces the output capacity of the system while dehumidifying, the dehumidification capacity decreases, and it is easy to cause the indoor temperature to drop and frequent start and stop, resulting in a decrease in comfort and energy saving

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