A VAV air conditioning system and its control method

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; The method includes: step S1, calculating the heat-humidity ratio ε of each room; step S2, obtaining the minimum value ε in the heat-humidity ratio of each room min , to judge ε min Whether it satisfies ε min >ε a , and determine whether there is a person in the room to which the minimum heat-humidity ratio belongs; step S3, if ε min satisfy ε min >ε a , and the judgment result is that there is a person, then ε=ε on the psychrometric diagram min The intersection of the heat-humidity ratio line and the relative humidity of φ=95% is the air supply state point; step S4, if ε min does not satisfy ε min >ε a , mark the room as a special room, if the judgment result is unmanned, mark the room as an unoccupied room, and obtain the minimum value ε of the heat-humidity ratio in the special room and other rooms except the unoccupied room min .

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 progress 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 the 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 as the air temperature regulation plays a vital role. The role of air conditioners is becoming more and more important, and the scope of use is becoming ...

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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