| Parameters | Unit |
| ra density of air | kg/m3 |
| Cpa specific heat of air | kJ/(kg・˚C) |
| V volume of the zone | m3 |
| Tz Temperature of the zone | ˚C |
| ma mass flow rate of the air stream | kg/s |
| Ts supply temperature | ˚C |
| K heat transfer coefficient in the ambient | W/(m2・˚C) |
| F contact area of the wall and zone | m2 |
| To temperature outside | ˚C |
| q(t) heat gains from occupants, and light | W |