Setting Up an Extract Only System

For extract only air-side systems you are able to input the design flow rate in l/s, l/s/m2, or ACH. If this value is zero then the minimum fresh air rate specified by the NCM will be used.

Monitoring for out-of-range values set to True will reduce the heating, cooling, auxiliary, and HWS consumption by 5%.

Exercise and Notes

  1. In this example there is local mechanical exhaust and the SFP has been entered as 0.5 W per l/s.

  2. The design flow rate will be 2 l/s/m2, giving a fan power density of 0.5 x 2 = 1 W/m2.

  3. Monitoring for out-of-range values = True.