Models should be preparing in accordance with BB101:2018; in summary:
- Set the CIBSE DSY1 2020 (50th. percentile range) weather file most appropriate to the location of the school building.
- Set space conditions (casual gains, occupancy etc). as BB101:2018 section 8.1 & 8.5.2.
- Set external ambient CO2 concentration of 400ppm.
- Openings should be defined correctly in Macroflo to reasonably represent the design as BB101:2018 section 8.3.
- Mechanical ventilation must be modelled correctly as BB101:2018 section 8.4; if there is balanced supply and extract ventilation air exchanges maybe utilised, however if the ventilation is extract only with openable windows an ApHVAC network and Macroflo will be required.