Fresh air flow control device for central air-conditioning system

Abstract

The invention discloses a fresh air flow control device for a central air-conditioning system. Measurement signals of a fresh air CO2 concentration sensor (2), a fresh air flow sensor (3) in each air-conditioning region, an air supply flow sensor (6) and a return air CO2 concentration sensor (8) are electrically connected with a required fresh air flow setter (4). Measurement signals of the freshair flow sensor (3) and fresh air flow set value signals in each air-conditioning region of the required fresh air flow setter (4) are electrically connected with a fresh air flow controller (10) which is electrically connected with a control end of an electric air valve (9). The required fresh air flow setter is electrically connected with the fresh air flow controller, and the fresh air flow setvalue of the fresh air flow controller is set in real time. The fresh air controller adjusts opening of the electric air valve so that the fresh air flow measurement value is close to or reaches theset value, thereby the invention satisfies the requirements of indoor sanitary condition and ventilation in the air-conditioning regions, and reduces the energy consumption of buildings as well.

Description

technical field [0001] The invention relates to a fresh air volume control device for a central air-conditioning system. Background technique [0002] In buildings using central air-conditioning systems, in order to reduce air-conditioning loads and energy consumption, the airtightness requirements of buildings are relatively high. In order to meet the sanitary conditions and ventilation requirements of each air-conditioning area, the fresh air system is generally used to deliver fresh air to each air-conditioning area. The traditional fresh air system cannot adjust the fresh air flow into each air-conditioning area according to the fresh air demand of each air-conditioning area, which will increase the energy consumption of the air-conditioning system due to the introduction of too much fresh air flow; or because the incoming fresh air flow is too small to meet the requirements The requirement of fresh air for indoor personnel makes indoor personnel suffer from hypoxic sym...

AI Technical Summary

Problems solved by technology

The traditional fresh air system cannot adjust the fresh air flow into each air-conditioning area according to the fresh air demand of each air-conditioning area, which will increase the energy consumption of the air-conditioning system due to the introduction of too much fresh air flow; The requirement of fresh air for indoor personnel makes indoor personnel suffer from hypoxic symptoms such as fatigue and drowsiness, which reduces labor productivity

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