Distributed variable air volume air supply system and control method thereof

Abstract

The invention discloses a distributed variable air volume air supply system and a control method thereof. The system comprises a primary fan, a secondary fan, an air supply main pipe electric air valve, an air supply branch pipe electric air valve, a main control cabinet, a tail end control cabinet, environment feedback devices and a static pressure transducer. The primary fan is arranged at the end of an air supply main pipe. The air supply main pipe air valve is arranged on the air supply main pipe. The air supply branch pipe electric air valve is arranged at the end of the air supply branch pipe. The secondary fan is arranged on the air supply branch pipe. The environment feedback devices are arranged in all rooms. The static pressure transducer is arranged at the tail end of the air supply branch pipe. The main control cabinet is electrically connected with the primary fan, the air supply main pipe electric air valve and the static pressure transducer. The tail end control cabinet is electrically connected with the air supply branch pipe electric air valve and the environment feedback devices. The invention further provides the control method of the air supply system. Through the system and method, the real-time variable air volume demands and the thermal comfort demands of all the rooms can be met accurately, and efficient energy-saving operation of the whole system can be achieved.

Description

technical field [0001] The invention belongs to the field of building energy saving and air conditioning ventilation control, and in particular relates to a distributed variable air volume air supply system and a control method thereof. Background technique [0002] With the continuous increase of high-rise buildings, office buildings, restaurants, and guesthouses in my country, as well as the large-scale construction of subway stations, the use of central air-conditioning is also increasing. The air-conditioning system is more complex and large, and its proportion in the entire building energy consumption is also increasing. bigger. Since the energy consumption of air-conditioning accounts for more than 60% of the energy consumption of the whole building, energy-saving of air-conditioning becomes increasingly important. [0003] According to relevant statistics, air-conditioning equipment operates 97% of the time at a load fluctuation of 70%. Therefore, the use of variable ...

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Problems solved by technology

In addition, in some places where the temperature changes greatly, the constant air volume air conditioning system cannot accurately meet the requirements of frequent changes in room load and local temperature changes

[0004] Due to the difference in room layout, the length of the air supply branch pipes corresponding to each room is often very different, which will cause the hydraulic imbalance of each air supply branch pipe

Usually, in the design stage, the designer adjusts the size of the air duct to control the hydraulic unbalance coefficient of each branch within 15%. However, this method still cannot eliminate the hydraulic unbalance of each air supply branch. Before operation, system commissioning personnel are required to repeatedly debug the air supply system by adjusting the opening degree of the air valve, so that the air supply volume of each room roughly meets the design requirements

[0005] Obviously, this will greatly increase the workload of designers and system debuggers; at the same time, the individual controllability of the air volume of the room is poor, and the air supply volume of the room cannot be adjusted according to the load changes of the rooms, and the air supply volume of individual rooms is too large or too small The situation is unavoidable, which greatly affects the thermal comfort of the air conditioning system

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