Application of self-adaptive static pressure variable frequency control in variable air volume system

With the development of variable frequency technology, the frequency converters have been widely applied in variable air volume systems. The existing static pressure control method is easy to cause supercooling or overheating in certain indoor area. According to the deviation of the total supply air volume and total required air volume, and the number of VAV terminals with fully-open dampers, optimizes the static pressure resetting, and proposes the self-adaptive static pressure variable frequency control scheme. Applies this control scheme to the VAV systems of an office building in Hong Kong. The operation results show that the energy saving rate is about 7.14%, the system control is stable and more adaptable to the cooling load change, and the thermal comfort is improved significantly.