HVAC Control

Carolina Vergnano

LEED AP

Concremat

LEEDuser Basic Member

110 thumbs up

May 15, 2012

Hello, I'm working in a project that has 2 meeting room of 7 m2 next to each other and one of meeting room is exposed to exterior window. My doubt is, do I have to install a separate control (installing a VAV box in each room) for each meeting room to comply with the ASHRAE 90.1 mandatory (item 6.4.3 Controls) or I can use a single thermostatic control to control the temperature of the both rooms, considering that the room is very small and can be grouped as a single zone? The system is a AHU with VAV boxes.

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 05/25/2012 - 12:35

6.4.3 requires controls by zone, not by room. So you could use a single thermostatic controls for both rooms. The occupants may curse you for it later as they disagree over the setting :-)

Carolina Vergnano

LEED AP

Concremat

LEEDuser Basic Member

110 thumbs up

Fri, 05/25/2012 - 12:44

So, to define a zone I don't consider if the zone is or not exposed to solar radiation, only the schedule and the type of the rooms are take in consideration. Am I correct?

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 05/25/2012 - 13:02

The definitions in 90.1 are a very helpful resource. zone, HVAC: a space or group of spaces within a building with heating and cooling requirements that are sufficiently similar so that desired conditions (e.g., temperature) can be maintained throughout using a single sensor (e.g., thermostat or temperature sensor). Regarding solar radiation it depends on which way the window faces.