Integrated static pressure reset with fan airflow station in dual-duct VAV system control

Lixia Wu, Mingsheng Liu, Gang Wang, Xiufeng Pang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


Air duct static pressure is usually a control variable maintained by the supply fan for variable air volume (VAV) systems. Typically the air static pressure is set at a constant set point based on design conditions. However, under partial load conditions, terminal box dampers have to be closed more since required airflow is less than the design airflow which directly results in significantly smaller pressure loss. Thus no matter the terminal boxes are pressure dependent or pressure independent, the static pressure set point should be reset to a lower level to reduce the fan energy, the noise in the terminal boxes, and the terminal boxes malfunction. With the static pressure reset, the room condition can also be maintained better at lower fan energy consumption by minimizing simultaneous cooling and heating. This paper proposes to control the static pressure in dual-duct variable air volume systems by using supply fan variable frequency drives (VFDs) and installing hot air dampers in the hot deck. The static pressure set point is reset based on fan airflow measured by fan airflow station (FAS). With regard to affecting factors of space load, availability of terminal box damper position and space cooling demand, this integrated method has advantages over the existing measures such as fixed static pressure, static pressure reset by outside air temperature, static pressure reset by VAV box damper position and static pressure reset by cooling loop output. According to both the model analysis and case building study, it turns out that this method can significantly save fan power.

Original languageEnglish (US)
Title of host publicationProceedings of the Energy Sustainability Conference 2007
Number of pages9
StatePublished - 2007
Externally publishedYes
Event2007 Energy Sustainability Conference - Long Beach, CA, United States
Duration: Jun 27 2007Jun 30 2007

Publication series

NameProceedings of the Energy Sustainability Conference 2007


Other2007 Energy Sustainability Conference
Country/TerritoryUnited States
CityLong Beach, CA

ASJC Scopus subject areas

  • Energy(all)
  • Electrical and Electronic Engineering


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