Fresh air variable air rate energy saving method and device based on absolute humidity control

Abstract

The invention relates to a fresh air variable air rate energy saving method and device based on absolute humidity control. The fresh air variable air rate energy saving method is characterized in that the fresh air variable air rate energy saving device based on the absolute humidity control is arranged at the tail end of the fresh air system of an air conditioning system, the opening degree of a valve is automatically controlled through the fresh air variable air rate energy saving device according to the change of indoor humidity, and the fact that the volume of fresh air supplied indoors meets indoor actual dynamic needs is guaranteed; the air volume is automatically adjusted according to the change of the moisture content, namely, the absolute humidity of a room, air output by a fresh air handling unit is dry air of a fixed state, and the relative humidity value of the room is guaranteed; the coupling relationship of relative humidity and dry-bulb temperature is relieved. The absolute humidity, an indoor environment parameter, is controlled, the indoor relative humidity can be precisely controlled, the coupling relationship of the relative humidity and the dry-bulb temperature is relieved well, the moisture condensation risk of a cold emission plate is avoided, meanwhile, control is stable and reliable, and the fresh air variable air rate energy saving method and device have good comfort and the good energy saving effect.

Description

technical field [0001] The invention relates to a fresh air variable air volume energy-saving method and device based on absolute humidity control, which is an energy-saving air-conditioning system specially matched with an air-conditioning system with independent temperature and humidity control. The utility model belongs to the field of energy-saving control of an air-conditioning system. Background technique [0002] With the emergence of a large number of air-conditioning systems and air-conditioning equipment, the energy consumption of air-conditioning has become a conspicuous problem. With the development of urban construction, building energy consumption has accounted for about 30% of the country's total energy consumption, while air-conditioning energy consumption generally accounts for more than 60% of the entire building energy consumption, and the proportion continues to increase. Therefore, the energy saving requirement of the air conditioning system has been re...

AI Technical Summary

Problems solved by technology

[0004] (1) Excessive transmission and distribution of the fresh air system leads to high energy consumption: the fresh air system in the traditional air conditioning system generally adopts a constant fresh air system, and the supply air temperature of the fresh air is ≤16°C

For example, in the air-conditioning system with fresh air plus fan coil unit, the fresh air unit is responsible for the fresh air supply of multiple rooms. The fresh air unit is always running at full load and the air supply state is basically stable, so there are a lot of no-load, excessive transmission and distribution, and humidity adjustment. Excessive (temperature and relative humidity coupling) and other conditions, resulting in a great waste of energy

There is also the problem of excessive transmission and distribution for the current independent temperature and humidity adjustment system that is popular at this stage;

[0005] (2) Based on the above reasons, there is currently an energy-saving system that controls the operating frequency of the fresh air fan according to the concentration of carbon dioxide, but its energy-saving effect is not ideal

The main reasons are: firstly, because the detected value of carbon dioxide is mostly the value of a certain reference point, and the test value is affected by the wind speed of the measured point, it is difficult to reflect the actual demand of each fresh air supply point; secondly, the carbon dioxide control method is often affected by the outdoor carbon dioxide concentration Very large, for example, outside CO 2 When the concentration is high, the probe will mistakenly think that there are more people in the room, which will lead to an increase in the fresh air volume in the room, which will lead to an increase in system energy consumption;

[0006] (3) There is a potential risk of condensation for the temperature and humidity independent adjustment system

When the amount of humidity in the room increases (for example, the number of people increases, etc.), if the input of the room's fresh air volume cannot be dynamically and accurately changed according to the indoor demand, it will inevitably lead to a potential increase in the risk of condensation; and for controlling the fresh air machine according to the concentration of carbon dioxide Frequency conversion system, such as external CO 2 When the concentration is low, the probe will mistakenly think that the number of people in the room has decreased, resulting in too little fresh air in the room, which also leads to an increase in the potential risk of condensation

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