System for controlling indoor fresh air quantity according to carbon dioxide (CO2) concentration

A system for controlling an indoor fresh air quantity according to carbon dioxide (CO2) concentration belongs to the air-conditioning heating, refrigerating and fresh air heat exchange control field. The system for controlling the indoor fresh air quantity according to the CO2 concentration comprises a fresh air handling unit; the fresh air handling unit is connected with an intelligent controller, the intelligent controller is connected with an indoor room controller. The key technology of the utility model is that the intelligent controller comprises a fresh air frequency conversion controller, a CO2 concentration sensor, an air port control valve and a CO2 concentration comparison module; the fresh air handling unit is connected with the fresh air frequency conversion controller in the intelligent controller, the fresh air frequency conversion controller is connected with a computing storage module, and the computing storage module is connected with an air port control module, the air port control module is connected with the room controller, and the CO2 concentration sensor is arranged on the room controller, the CO2 concentration sensor is connected with the CO2 concentration comparison module, the room controller is connected with the air port control valve at an air outlet. According to the utility model, the air can be supplied in time as required according to the CO2 concentration, and the resource-saving, energy-saving and low-carbon requirements of modern buildings can be satisfied.