VAV air conditioning system and control method thereof

Abstract

The invention discloses a VAV air conditioning system and a control method thereof. The VAV air conditioning system comprises an air conditioning unit A and a controller, a unit fresh air opening, a unit air return opening and a unit air supply opening are formed in the air conditioning unit, and an evaporator is arranged in the air conditioning unit. The control method comprises the steps that S1, the heat-humidity ratio epsilon of each room is calculated; S2, the minimum value epsilon<min> in the heat-humidity ratios of all the rooms is acquired, and whether epsilon<min> meets the condition that epsilon<min> is greater than epsilon or not is judged; and whether someone exists in the room to which the minimum value of the heat-humidity ratio belongs or not is judged; S3, if epsilon<min> meets the condition that epsilon<min> is greater than epsilon, in addition, the judgment result is that someone exists, then an intersection point of a heat-humidity ratio line of epsilon=epsilon<min> and relative humidity of phi=95% on a psychrometric chart is taken as an air supply state point; and S4, if epsilon<min> does not meet the condition that epsilon<min> is greater that epsilon, then the corresponding room is marked as a special room, if the judgment result is that nobody exists, then the corresponding room is marked as an unmanned room, and a heat-humidity ratio minimum value epsilon<min> of the special room and other rooms except the unmanned room is acquired.

Description

technical field [0001] The invention relates to the field of air-conditioning control systems, in particular to a VAV air-conditioning system and a control method thereof. Background technique [0002] With the development of society, especially the advancement of science and technology, the rapid development of social productive forces has been greatly promoted, and people's living standards, especially material living standards, have undergone earth-shaking changes. The advancement of science and technology has promoted the rapid leap of industrial society. The same large-scale industrial equipment is widely used to improve people's quality of life. For example, in the cold winter, the environment is as warm as spring; in the hot summer, the environment is still cool and pleasant. Among them, the air-conditioning system, which regulates the temperature of the air, plays a vital role. The role played by air conditioners is becoming more and more important, and the scope of...

AI Technical Summary

Problems solved by technology

[0003] The VAV air-conditioning system has the advantage of avoiding hydraulic imbalance. However, due to the different heat and humidity requirements of each room, it is difficult to meet the needs of all rooms after the air-conditioning system supplies air. Therefore, the control of the VAV air-conditioning system becomes the key point of its application. a big difficulty

The current VAV variable air volume air conditioning system usually calculates the air supply state point based on humidity or temperature. However, the heat load and humidity load of different rooms do not change in the same proportion. When the room temperature requirements are met, the humidity will deviate from the indoor requirements. , resulting in indoor temperature and humidity that cannot meet the actual needs of users

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