Variable air volume (VAV) energy-saving control system for central air-conditioner

Abstract

The invention discloses a variable air volume (VAV) energy-saving control system for a central air-conditioner. The system comprises a master control cabinet, an air supply unit, air ducts, variable air volume (VAV) adjusting valves, indoor controllers and a monitoring system, the air supply unit comprises a frequency converter, a surface air cooler, a heater and a draft fan, a fresh air inlet provided with a fresh air valve and an air supply outlet are formed in an air supply duct, an air return duct is connected with the air supply duct through a fourway pipe provided with a proportion adjusting valve, and the monitoring system comprises an air supply pressure detector, a static pressure detector, an air return temperature detector, an indoor temperature detector and a carbon dioxide content detector. The control system can be set according to different users, local temperature can be changed, indoor air can be circulated continuously through the air return duct, the consumption amount of thermal energy or cold energy is reduced, and resource waste is decreased; in addition, according to the indoor carbon dioxide content detector, the master control cabinet adjusts the opening of the proportion adjusting valve and the opening of the fresh air valve, the fresh air inlet amount and air exhaust amount can be adjusted, the comfort degree of a user is raised, and meanwhile the energy dissipation is decreased to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of central air-conditioning systems, in particular to a central air-conditioning VAV variable air volume energy-saving control system. Background technique [0002] With the continuous increase of high-rise buildings, office buildings, restaurants, and guesthouses in my country, 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. 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. According to relevant statistics, air-conditioning equipment operates 97% of the time at a load fluctuation of 70%. Therefore, the use of variable air volume air-conditioning can reduce air-conditioning energy consumption and achieve the purpose of economica...

AI Technical Summary

Problems solved by technology

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

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