双风机变风量空调系统
Two fans in series for VAV air conditioning systems
摘要：
早期的变风量空调系统设计只配备1台风机(送风机),而随着变风量空调系统的发展,越来越多的变风量空调系统设计配备了1对风机,即送风机+回风机或送风机+排风机。本文从理论上解释了为什么配备回风机或排风机的双风机系统设计比只配备1台送风机的单风机系统设计节能,并分析了双风机设计的优缺点,论述了如何设计和控制双风机变风量空调系统。
Abstract：
Early variable air volume (VAV) air conditioning systems are designed with a single fan (supply air fan). With the development of VAV air conditioning systems, more and more VAV air conditioning systems are designed with two fans in series, namely supply air fan with return air fan or supply air fan with exhaust air fan. This paper theoretically explains why the design of two fans in series is more energy-efficient than the design of single fan, analyses the advantages and disadvantages of the two types of two fans in series designs, and discusses how to design and control the VAV air conditioning system with two fans in series.
Keywords:variable air volume (VAV) air conditioning system; single fan system; two fans in series system; supply air fan; return air fan; exhaust air fan; indoor static pressure control; energy saving