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NC-v4 EQc5:Thermal comfort

Multiple Thermostats on One VAV Box for Individual Occupant Spaces

Profile picture for user Gatorjim
James Keohane
Sustainability and Commissioning Consultant
Sustainable Engineering Concepts, LLC
LEEDuser Basic Member
86 thumbs up

To demonstrate compliance with the 50% requirement for Individual Occupant Spaces:  Is it acceptable to have one VAV box with two(2) thermostats/sensors serving 2 of 3 offices?  Thermostats would be programmed to meet average of the setpoint request OR most demanding space.  Is this arrangement acceptable as providing individual occupant control to 2 of 3 spaces and thus 63%??

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Profile picture for user Gatorjim
James Keohane
Sustainability and Commissioning Consultant
Sustainable Engineering Concepts, LLC
LEEDuser Basic Member
86 thumbs up

Sat, 04/13/2019 - 02:46

66%       pardon the fat fingers!
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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Sat, 04/13/2019 - 13:26

This is a great post, thank you for throwing this out to LEEDuser. In my opinion I think your idea meets the intent of the credit, however some may disagree.  In situations such as this we typically include plug-in desk fans within offices and/or at work stations that do not have dedicated thermostats. We have been successful in LEED reviews with this approach. Good Luck!
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Allison Smith
Sustainable Design Leader
HKS, Inc.
LEEDuser Premium Member
40 thumbs up

Thu, 06/20/2019 - 16:16

I ran across your inquiry and last year received this guidance from LEED Coach in response to another question about using apps for thermal/lighting controls, but it is relevant:  For example, for an open office area with six individual workstations, if only one FCU or VAV terminal unit is designed to condition the space, there is only one setpoint temperature that the space can be controlled to. Providing all six occupants with software access to adjust that temperature setpoint would not count as six individual thermal controls since the system could not adjust to accommodate more than just one of the control requests.

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