Multi-area real-time fresh air volume calculation method and implementation device therefor

Abstract

The invention provides a real-time fresh air volume calculation method and belongs to the technical field of air volume calculation for a central air conditioning system. The method is based on a CO2 concentration monitoring device and used for calculating real-time demanded fresh air volume of air conditioning areas and requires installation of a CO2 concentration detector or people detectors as well as an air volume detector in the air conditioning areas. For an area with stable people density, the people density can be considered to keep a designed value. A system fresh air volume set value obtained through calculation can be applied to a system equipped with a direct digital controller and is used for setting the minimum fresh air volume of an air cabinet of a multi-area air volume variable system. The design is reasonable, and real-time demanded fresh air volume of each area and demanded fresh air volume of the system can be calculated, so that the minimum fresh air volume set value of the system can be set and used for regulating opening of a fresh air valve of the system.

Description

technical field [0001] A calculation method applicable to the real-time demand for air volume of a multi-zone variable air volume central air-conditioning system, especially the area served by the system may include an area equipped with a carbon dioxide sensor, or an area equipped with a human detector, or an area without any sensor. Background technique [0002] At present, there are two commonly used methods for calculating the fresh air volume. One is called the number of air changes method, which is calculated based on the room volume multiplied by the number of air changes, and the other is calculated based on the minimum fresh air volume required by the indoor personnel. [0003] In the design, the fresh air volume is determined according to the design value under the most unfavorable conditions. The number of people in the rooms in actual operation is generally lower than the design value, and the real-time required fresh air volume will be correspondingly reduced. On...

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Problems solved by technology

However, the current calculation scheme only detects the carbon dioxide concentration of the return air of the air conditioner, and makes the carbon dioxide concentration of the system return air lower than the set value (usually 1000ppm) by controlling the fresh air volume of the system.

Although this method can reduce the fresh air volume of the system, it does not take into account that in the multi-zone air-conditioning system, the fresh air volume requirements of different areas are completely different, which will cause insufficient fresh air volume in some areas and excess fresh air volume in other areas, resulting in unnecessary waste. Unsatisfactory energy consumption or indoor air quality

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