Locally controlled air movement preferred in warm isothermal environments

Marc Fountain*, Fred Bauman, Edward Arens, Katsuhiro Miura, Richard de Dear

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


Air movement is one of the six main variables determining human thermal comfort. This work focuses on air movement for cooling in the expected temperature range, 25.5°C to 28.5°C, of the so-called transition zone: the transition zone from desirable cooling to uncomfortable draft, involving a complicated function of physics, physiology, and human expectation. Fifty-four human subjects were given control of the air supply velocity from a desk fan (FAN), a floor-mounted diffuser (FMD), and a desk-mounted diffuser (DMD) at a single ambient air temperature. Physical measurements of the environment were made and subjective votes collected, which included thermal sensation, thermal preference, work area preferences, personal control preferences, and health characteristics. A model that predicts the percentage of satisfied people (the PS model) as a function of air temperature and air movement in warm conditions is proposed.

Original languageEnglish
Pages (from-to)937-952
Number of pages16
JournalASHRAE Transactions
Issue number2
Publication statusPublished - 1994

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