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

Abstract

The present invention relates to a fresh air variable air volume energy-saving method and device based on absolute humidity control. The change of indoor humidity automatically adjusts the opening of the valve to ensure that the amount of fresh air sent into the room meets the actual dynamic needs of the room; the amount of air supply is automatically adjusted according to the change in the absolute humidity of the room, that is, the humidity content, and the air sent by the fresh air unit is in a constant state Dry air, to ensure the relative humidity value of the room; remove the coupling relationship between relative humidity and dry bulb temperature. By controlling the absolute humidity of the indoor environment parameters, the present invention can not only accurately control the indoor relative humidity, but also better release the coupling relationship between the relative humidity and the dry bulb temperature, avoiding the risk of condensation on the cold radiation plate, and at the same time, the control is stable and reliable, and has a good performance. comfort and energy saving.

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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