Comfort, Operation & Energy Savings
Twa MAC Beams use only 100% fresh outside air. Absenteeism, and lost time is reduced as a result of a more comfortable environment. Using dedicated outside air systems allow for smaller MUA footprints and provide more affordable air-side energy recovery.
Acoustic signatures of MAC Beams are barely perceptible. In the case of a unit operating at 1” w.c., all nozzle sizes will yield no more than NC26. Lower duct static pressures, yield lower sound pressure levels.
The chilled water servicing the coil within the MAC Beam is maintained at 2-8°F above the dew point of the primary air, as a result, no condensate forms on the unit mounted coil.
Twa MAC Beams can produce one ton of refrigeration with as little as 99 cfm. This ensures that the least amount of air is processed by the HVAC system, which in turn, optimizes fan energy usage.
Two-position control valves can be used to manage the MAC Beam's capacity. Approximately 65-75% of the cooling effect is provided by the chilled water coil. The primary air continues to provide ventilation with no water flow to the coil, and the dehumidification effect remains. Two-position control valves are the most common and least costly control technique.
MAC Beams can easily provide 110 Btuh/ft2 of total sensible cooling. Challenging sensible heat gains are no longer an additional fan burden. In typical HVAC applications, Twa MAC Beams require no more than 99-225 cfm/Ton of cooling.
Higher chilled water temperatures (55-61°F), and lower hot water temperatures (85-115°F) dramatically improve equipment efficiencies and potentially double the COP of the chiller plant compared to conventional operating temperatures.
A high induction ratio within the beam provides excellent room air mixing. Room air temperature variations are reduced, ventilation effectiveness is increased, and a comfortable air movement within the space is enjoyed by the occupants.
The low overall requirement for system air fan horsepower allows for low velocity downstream ducting. As a result, frictional duct losses can be made negligible by “slightly” over-sizing only the duct work servicing the beams. (=600 fpm for beam run-outs.)
Mixing of primary and secondary air within the beams, produce warmer discharge air temperatures allowing flexible beam placement.
High induction ratios of 3:1-6:1 ensure the least amount of ventilation air is used to cool/heat the occupied space; minimizing operating costs.
Water-side economization is maintained with closed circuit fluid coolers, dry coolers or cooling towers. Where appropriate, mixed-mode ventilation also adds the possibility of additional energy savings. Geothermal and water-to-water heat pumps allow for the efficient management of heating/cooling loads within the building envelope. Next...