LPD for space with higher headroom

William Wong

LEEDuser Basic Member

28 thumbs up

February 13, 2012

Does anyone know what headroom height are based on when ASHRAE design the LPD for space-by-space method (Table 9.6.1) ? I notice that they allows a high LPD for high bay (18 W/m2) manufacturing space than the low bay area (13W/m2). Could this apply to other space types such as lobby with a high headroom with the same principle?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 02/13/2012 - 14:41

To determine the LPD used they assumed some average height typical of US buildings. I don't think you can factor fixture height into your LPD calculations. In most cases you can lower the fixture itself to take advantage on the inverse square law. They differentiate between high and low bay because lowering the fixtures can get in the way of the activity in those types of spaces. This is generally not the case in a lobby.