We have a central Air Handling Unit supplying 100% outside fresh air to all the rooms in a building, e.g offices, meeting rooms, conference rooms, etc This air will be tempered to say 18 degrees Celsius - provides min fresh air requirements. This fresh air is supplied to the back of Fan Coil Units in each space, some spaces may have more than one Fan coil unit. The fan coil unit will supply the additional heating / cooling required. Its a constant volume system. Based on this my question is should this be considered as (1) Single Zone Unit, (2) 100% Outside Air or (3) Multiple Zone Unit in terms of the credit form.

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Michael Smithing

Director - Green Building Advisory

Colliers International Ltd.

LEEDuser Basic Member

201 thumbs up

Tue, 08/02/2016 - 07:28

This appears to be a 100% outdoor air system, we work with these a lot. If the system distributes 100% outdoor air to the fan-coils which then deliver the air to the room, it is 100% OA. If the system delivers the outdoor air directly to the room and it circulates through the fan-coils, it is 100% OA. If the system delivers 100% OA to the fan-coils which deliver it to the room together with air recirculated from the room (ie. the unit supply is greater than the OA supply) then you must use the single zone unit.

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