Fig. 3

Zone model implemented in Dymola/Modelica. Inputs to the model are solar radiation, “solrad”, measured outdoor temperature “Tout”, number of occupants, “occ”, Ventilation air temperature setpoint, “Tvestp”, CO2 setpoint, “CO2stp” and temperature setpoint, “Tstp”. The output of the model is resulting temperature, “T”, resulting CO2 level, “CO2”, the rate of airflow from the ventilation system “verate”, the total airflow over the model simulation period, “vetot”, the supplied heat per second, “qrad”, and the total supplied heat “Qrad”