Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
1) Use the correct variable for calibration: 1-a- For matching with measured data from a standard room sensor, use Air Temperature (Zone Mean Air Temperature), not Operative Temperature. Operative Temp includes mean radiant effects and is mainly for thermal comfort metrics (PMV/PPD), not for calibration. 1-b- Increase your simulation timestep to 6–12 per hour — this often removes unrealistic spikes caused by numerical oscillations.
2) Ventilation & Infiltration: Default infiltration rates are often too low, especially for older fibro-type houses. You might want to try 0.7–1.5 ACH as an average baseline. Use wind- and temperature-driven infiltration, and apply realistic day/night schedules (e.g., windows slightly open at night) to capture natural cooling.
| | 2 | No.2 Revision |
1) Use the correct variable for calibration:
calibration
1-a- For matching with measured data from a standard room sensor, use Air Temperature (Zone Mean Air Temperature), not Operative Temperature. Operative Temp includes mean radiant effects and is mainly for thermal comfort metrics (PMV/PPD), not for calibration.
calibration.
1-b- Increase your simulation timestep to 6–12 per hour — this often removes unrealistic spikes caused by numerical oscillations.
2) Ventilation & Infiltration:
Infiltration
Default infiltration rates are often too low, especially for older fibro-type houses. You might want to try 0.7–1.5 ACH as an average baseline. Use wind- and temperature-driven infiltration, and apply realistic day/night schedules (e.g., windows slightly open at night) to capture natural cooling.
