How air movement saves energy in indoor environments.

Author(s) : AYNSLEY R.

Type of article: Article


A caution is given against using the lesser thermal comfort expectations of occupants, in naturally-conditioned space, in design for occupants of air-conditioned space. Temperature offsets for cooling from local air movement of up to 4.4 K are indicated for air speeds of 1.6 m/s from ASHRAE Standard 55-2004 in air-conditioned spaces. Graphs indicate the influence of relative humidity on temperature offsets in air-conditioned and naturally-conditioned space. A cooling energy savings rate of 6%/K is suggested for the combined effects of temperature offsets and local airflow from circulating fans in air-conditioned spaces. During cooler months in sub-tropical regions, de-stratification with large ceiling fans can save approximately 10% of heating energy for each 3 m of floor to ceiling height in spaces with ceiling heights over 7 m.


  • Original title: How air movement saves energy in indoor environments.
  • Record ID : 2008-0821
  • Languages: English
  • Source: EcoLibrium - vol. 6 - n. 4
  • Publication date: 2007/05


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