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ASHRAE-55 comfort criteria ask for space air speed. Is this the same as the supply air volume measured in cubic feet per minute (CFM)?


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NC-2009 IEQc7.1:Thermal Comfort—Design

Increasing the indoor operative temperature

Hi, we are doing a project in South east Asia for LEED NC. We are planning to maintain the indoor operative temperature of the building at 77 deg F as against 75 deg F as per ASHARE thermal comfort design. We are doing so; as the other existing buildings of the same organization has been maintaining the indoor temperature as 77 deg F for the past one year in response to save energy and have not received any complaints from the occupants. The organization is also planning to make this as their company’s policy in order to conserve energy. Will this be compliant for the IEQ C 7.1 ? What would be the supporting documents that would be required to substantiate the same?

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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Wed, 06/25/2014 - 00:53

I suggest you try using either the ASHRAE comfort tool software (available at ashrae.org for about $99 last I checked) or the CBE comfort tool available free. By entering a lower clothing insulation level (clo) and other variable values more typical of southeast Asia, you may find that 77 degrees does indeed fall within the comfort window. From posts below: "The CBE Thermal comfort tool also will calculate PPD/PMV. Although it gives the warning "Does not comply with ASHRAE Standard 55-2010 ↳ Metabolic rates below 1.0 or above 2.0 are not covered by this Standard" it still performs the calculation." Available free at http://cbe.berkeley.edu/comforttool/ I used the CBE Thermal Comfort Tool for documentation on a project after seeing it referenced here. It seems to work best in Google's Chrome web browser.

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