Make-up air systems condition outdoor air and distribute it to laboratories or cleanroom air recirculation loops. A good make-up air system:
·Provides humidity control,
·Ensures make-up air is balanced with exhaust air,
·Maintains and controls building pressurization,
·Effectively treats outdoor contaminants, and
·Provides cost-effective energy-savings opportunities. [Brown, 1990]
Make-up air for laboratories should be limited to 1 cfm/ft2 (5.08 L/s-m2), per the right-sizing techniques described in Chapter 3. Make-up air for cleanrooms can be from 1 cfm/ft2 (5.08 L/s-m2) to 10 cfm/ft2 (50.81 L/s-m2), typically averaging 5 cfm/ft2 (25.4 L/s-m2). Conditioning such large amounts of outside air is very energy intensive. Therefore, the greatest opportunity for energy savings is to reduce or displace mechanical cooling or fuel-generated heating requirements. Significant portions of the cooling load can be satisfied with "warmer" cooling water. The sensible heat load produced by a cleanroom and the air recirculation loop can usually be removed with water no colder than 60 degrees F (15.6°C). [Brown, 1990]
Make-up system acoustics and vibration
