How Twa MAC Beams Work

Primary air (100% outside air) is dehumidified to between 50-57 degree F dew point and is used to: control latent requirements of the space, provide fresh air to the occupantsm, and pressurize the beam plenum. The primary air then passes through an array of formed nozzles along the length of the beam. The jets of air discharging from the nozzles cause room air (secondary air) to be drawn through the unit mounted coil via induction. The coil is serviced by chilled water which is maintained at 2-8 degree F above the dew point of the primary air. The localized recirculation of room air provides substantial sensible cooling to the space at exceptionally low acoustic signatures (NC18-NC26). As a result of the reduction in total fan power, an higher chilled water operating temperatures, the building HVAC operating cost can be reduced by as much as 50% compared to "all-air" systems.

A) 1" (25mm) standing duct collar for primary air. Duct run-out servicing unit is sized to limit air velocity less than or equal to 600 fpm.
B) Primary air plenum. (100% outside air)
C) Secondary air. (room air)
D) Unit mounted coil. (Two and/or four pipe available. Typical chilled water: 55-61 degree F, hot water: 85-115 degree F)
E) Mixed air. (Induction ratio range = 3:1 - 6:1 depending on nozzle selection)
F) Discharge air (Typical Cooling : 63-66 degree F, Heating: 75-85 degrees F)
G) Adjustable mounting brackets. Unit quickly attaches to building structure via aircraft cable or threaded rod.

Due to the highly localized mixing within the beam, the temperature variations observed by the occupants are less than half of what would be expected with traditional air delivery systems. As a result, comfort levels are improved, and occupant complaints are minimized.

Twa MAC Beams are available in three basic sizes which are designed to fit within standard 2' wide T-bar ceiling grid, and can also be installed within a finished drywall ceiling (2'x4', 2'x6', 2',8'). Each module can be equipped with optional coil lengths, circuits, and induction nozzles, to suit the heating, ventilation, and air conditioning requirements of the space.  Next...