VFD application for constant volume air-handling units

Young Hum Cho, Mingsheng Liu, Gang Wang, Jinrong Wang, Timothy Rauscher

Research output: Contribution to journalConference article


Traditional constant air volume systems consume significantly more energy than variable air volume (VAV) systems because a constant amount of air is supplied to each zone regardless of the zone load. Due to seasonal and daily load variations, variable frequency drives (VFDs) can be installed on these constant air volume systems to reduce system energy consumption without needing to retrofit the terminal box. This paper presents the procedures for supply fan speed control and the results of its application in an office building. The results show electricity savings of 23% and gas savings of 19% over a six-month period.

Original languageEnglish (US)
Pages (from-to)824-830
Number of pages7
JournalASHRAE Transactions
Volume115 PART 2
StatePublished - Dec 1 2009
Event2009 ASHRAE Annual Conference - Louisville, KY, United States
Duration: Jun 20 2009Jun 24 2009


ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

Cite this

Cho, Y. H., Liu, M., Wang, G., Wang, J., & Rauscher, T. (2009). VFD application for constant volume air-handling units. ASHRAE Transactions, 115 PART 2, 824-830.