Hi, I am carrying out cooling calculations for an open plan office with FCU's. When using CIBSE Gain to calculate the room cooling loads I am selecting 'conditioned primary fresh air' as I have air at 18deg C from a central AHU with no humidification.
When I compare the results for one of the internal zones to my manual calculations the loads are significantly lower.
I have checked the model and all input parameters are as expected, the CIBSE Gain result is just lower than expected.
I would like to know how HevaComp treats fresh air introduced with this option.
The CIBSE Gain results for the perimeter zones with solar gain are close to the manual calcs
Any assistance would be much appreciated.