ASHRAE Publishes 2004 Thermal Environment Standard
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) published Standard 55-2004, Thermal Environmental Conditions for Human Occupancy, specifying the combination of factors that will produce thermal environmental conditions acceptable to most occupants within the space.
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) published Standard 55-2004, Thermal Environmental Conditions for Human Occupancy, specifying the combination of factors that will produce thermal environmental conditions acceptable to most occupants within the space. The factors include temperature, humidity, air speed, human activity, and clothing worn by the occupants.
The standard contains a new predicted mean vote calculation method that allows users to specify different levels of comfort. "The PMV method is easier to use, and hopefully will result in engineers being more likely to use it rather than defaulting to the simpler graphic comfort zone, where the assumptions might not match their particular conditions," said Gail Brager, vice chair of the Standard 55 committee. The standard also contains a new, optional method for determining acceptable conditions in naturally conditioned spaces.
For more information, visit (www.ashrae.org).
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