I am working on a building project that requires a high ventilation rate for fire safety: 6 air changes per hour (ACH). The winter design temperature is -14, so moving that much air through the system will obviously impact the total building heat load significantly with a 200,000 ft3area.
When I run the analysis with the Revit loads tool before setting the ACH, it returns a heat load of 103,000 Btu/hr. If I set the zone ventilation to 6 ACH, it returns a heat load of 1,662,000 Btu/hr. From a simple heat transfer standpoint, it would make sense that the heating load would skyrocket when you are pumping that much cold air into the building. However, during the winter, part of that makeup air will be infiltrating the building through a heater, so the delta T will not be the difference between the -14 degrees F, and the 50 degree F setpoint, but, rather the heater output temperature and the setpoint.
Does anybody know of a way to account for this within Revit?