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Calculation of resistances for an insulated wall
| Surface | Area (m2) | U Value (W/m2K) | Thermal Loss (w/K) |
| Floor | 104 | 0.60 | 62.4 |
| External Walls | 102 | 0.40 | 40.8 |
| Windows | 16 | 2.00 | 32.0 |
| Roof | 146 | 0.35 | 51.0 |
| Roof Windows | 9.6 | 2.20 | 21.0 |
| Internal Walls | No Loss | - | - |
| Total for building fabric | 207.3 |
Assuming a Room Temperature is required at 20C and an outside temperature of 0C
The heat loss for the fabric = 207.3 X3=20 = 4146 W
Air Infiltration is assumed at one air change per hour.
Heat loss = Volume X specific heat X difference in Temperature
= 520m3 X 0.33 X 20 = 3432 W
Total Heat Loss = 4146 +3432 = 7578 W
Would suggest 6 radiators having at least 1263 W output.
From Manufacturers Catalogue 600mm high X 1000mm long double panel radiator gives 1336 W this would do the job
To test a U Value, watch our videos on calculating a U value and testing a U value