If zones in the actual building are naturally ventilated then the same zones in the notional building will be naturally ventilated.
If you have apertures in the source TBD file adjacent to naturally ventilated zones then you must apply an aperture type in the source TBD to inform the software by what proportion the apertures will open and under what internal and external conditions they will open and close.
The notional building will not have operable apertures. It will use a ventilation function to increase natural ventilation by up to 5 ACH when the zone temperature exceeds the (high) thermostat lower limit by 1 K. The enhanced ventilation will end when the zone temperature is less than the heating set-point. This strategy will prevent overheating which might artificially depress the heating demand the next day therefore making the energy target unrealistic.
Naturally ventilated zones can be modelled with enhanced ventilation control (for example electronically operated trickle vents might form part of the building management system). This option will produce a modified fresh air rate based on Equation 13 using a demand control coefficient of 0.5 per Table 14 of the NCM modelling guide.
Zone heating can be supplied by a radiator or a direct electric source. If you choose radiator as the heating type then you will have to set up a boiler on the heating circuit configuration screen. If you select direct electric then the heating load will be met by grid supplied electricity with an efficiency of 100%.
Monitoring for out-of-range values set to True will reduce the heating, cooling, auxiliary, and HWS consumption by 5%.
Exercise and Notes
See the above screenshot for air-side system details used in this example.
Monitoring for out-of-range values = True.