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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

Naturally or mechanically conditioned?

Our project is a car showroom in a location where no air conditioning nor heating is needed due to the mild clima throughout the year. This is an occupied, enclosed space. There are no windows and no mechanical equipment to condition this space. Ventilation is given with a injection fan. How is this space CONDITIONED according to ASHRAE 90.1: naturally, mechanically or neither of them? The revised documentation shows that the Showroom space is occupied, enclosed space, but is neither mechanically or naturally conditioned. The response narrative implies that this area is exempt from the requirements of the credit. This is incorrect. The documentation does not demonstrate credit compliance.

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Lindsay Austrom
Mechanical Engineer
Stantec
LEEDuser Premium Member
18 thumbs up

Tue, 06/04/2013 - 20:23

Hi Alicia, If there is no installed heating or cooling capacity, then it sounds like the space is either "indirectly conditioned space" or "unconditioned space" as per the definitions in ASHRAE 90.1. Is the injection fan capacity for ventilation only, or is the outdoor air also used for cooling? Section 5.3 of ASHRAE 55 discusses a method to determine thermal comfort conditions in naturally conditioned spaces. However, this method relies on occupants having control over operable windows to adjust conditions in the space, which doesn't sound like it applies to your project. It sounds like you still need to show that the space has acceptable thermal comfort conditions as per ASHRAE 55. The results would indicate if no mechanical heating or cooling is required to maintain acceptable conditions.

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