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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

VAV minimum flow set points

Victoria Watson

AECOM

LEEDuser Basic Member

4 thumbs up

May 15, 2014

Hi, Appendix G3.1.3.13 says "Minimum volume setpoints for VAV reheat boxes shall be 2.15 L/s·m2 of floor area served or the minimum ventilation rate, whichever is larger" When you have a HVAC system which serves spaces which are required in the baseline to have demand controlled ventilation should the minimum volume set point for VAV be dynamic based on the minimum ventilation at any point or set based on the design minimum ventilation rate (e.g 7.5 cfm/person at peak occupancy). Thanks Vicky

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 05/27/2014 - 15:53

Above the G3.1.3.13 minimum setpoint the VAV should be dynamic assuming the ventilation requirement is higher than this minimum. As the occupancy increases the ventilation rate goes higher up to the maximum value. If the ventilation requirement decreases below the G3.1.3.13 minimum then the volume setpoint must be maintained.

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