Outdoor return air preprocessing method of central air-conditioning system

Abstract

The invention discloses an outdoor return air preprocessing method of a central air-conditioning system. The method comprises the steps as follows: temperature and humidity sensors arranged at all points of a return air section of the central air-conditioning system are used for collecting temperatures and humidity of the points respectively; the temperatures and the humidity which are collected by the return air temperature and humidity sensor, the fresh air temperature and humidity sensor, the mixed return air and fresh air temperature and humidity sensor and the air supply temperature and humidity sensor are judged, and then five zones are divided; and an exhaust valve, a fresh air valve, a return air valve and a cooling air valve are controlled correspondingly in the five zones to satisfy temperature and humidity requirements in an air-conditioned room. According to the method, the certain relative humidity of the air-conditioned room is guaranteed while the outdoor low-temperature air is effectively used for cooling the room, that is, the cooling purpose is achieved on the premise that the moisture of the air-conditioned room is not lost, and meanwhile, the humidification amount is reduced, so that the energy conservation purpose is achieved.

Description

technical field [0001] The invention relates to an air pretreatment method of an air conditioning system, in particular to an outdoor return air pretreatment method of a central air conditioning system. Background technique [0002] In an air-conditioned room with constant temperature and humidity (general temperature t: 24°C ± 2°C, relative humidity φ: 60% ± 5%), when the indoor heat dissipation is large, the outdoor temperature is often lower than At 10°C, the refrigerator should be started for cooling. [0003] In the central air-conditioning system designed with double-fan air-conditioning terminals, under this weather condition (when the outdoor temperature is lower than 10°C), in order to achieve the purpose of energy saving (or not turn on the refrigerator), it is often used to increase the exhaust air volume and Fresh air volume is used to achieve the purpose of indoor cooling, but in an air-conditioned room with constant temperature and humidity requirements, anoth...

AI Technical Summary

Problems solved by technology

The patented dual-system integrated machine room energy-saving air conditioner effectively combines the two systems of fresh air refrigeration and compressor refrigeration, achieving the same unit with different cooling methods in different seasons, but consumes a lot of energy

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