Full Description

Dedicated outdoor air systems (DOASs) use separate equipmentto condition all of the outdoor air brought into a building for ventilation,and deliver it to each occupied space, either directly or in conjunction withlocal or central HVAC units serving those same spaces. The local or centralHVAC units are used to maintain space temperature. A DOAS unit can be simple,with just a few components (e.g., a fan and a cooling coil), or more complex,with several energy recovery devices, cooling coils, heating coils and one ormore fans. Generally, the objective of a DOAS is to condition incoming outdoorair before it mixes (and is diluted) with the remainder of the building air sothat it is easier to dehumidify and clean, and so that energy in outgoing aircan be recovered to precondition incoming outdoor air.

Applications
Air Distribution
Equipment Configurations
Control

ISBN: 978-1-947192-53-9 (for SI versions of chapters)
ISSN: 1930-7705 (for SI versions of chapters)

Citation: 2020 ASHRAE Handbook -- HVAC Systems and Equipment