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I’m working on a project that has transient occupants. How does the IEQ space matrix address transients, and are transients required to have access to the controls?

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NC-2009 IEQc6.2:Controllability of Systems—Thermal Comfort

RH control with dew point control logic for IEQ 6.2

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J I
LEEDuser Basic Member
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This project is based in highly humid place, we have used dew point control logic for AHU control. In this control logic, we are controlling 2-way chilled water valve from signal from supply air dew point. VFD is controlled from return air temperature signal. Set point of supply air dew point is kept at 50F, so that humidity levels in room shall be taken care of during peak latent load condition also. Variations in sensible load are handled by VFD modulation. We wanted to check with experts from LEED point of view that can we avoid RH sensors ? As you will see from above control logic, we are achieving humidity control through supply air dryness and RH sensor is not playing any controlling role.

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Fri, 04/18/2014 - 01:41

Hello, This LEED credit wouldn't help to answer your question in terms of if you can avoid RH sensors. The key question to ask is if you are providing controls that are helping occupants change one of the key thermal comfort metrics noted above. It's not clear to me from your description whether or not this is the case. You only need to control one of the following: - air temperature - radiant temperature - humidity - air speed.
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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
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Fri, 04/18/2014 - 14:28

The question seems more applicable to a different credit - IEQc7.1 Thermal Comfort Design. For IEQc7.1, I believe your method would qualify as acceptable humidity control without having RH room sensors.
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J I
LEEDuser Basic Member
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Mon, 04/21/2014 - 10:45

Thanks Lauren and Julia for your response. So to qualify for IEQc 6.2, I have to have individual control for any of the our comfort key parameters to 50% of the occupants?? Though this design approach is acceptable for IEQc7.1 as highlighted by Julia. Thanks in advance,

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