Bombinho's guide to radiators.
Interpolating in the table provided by Stelrad a radiator specified at ΔT 50°C has to be derated by the factors in this table:
| ΔT °C | Operating factor |
|---|---|
| 20 | 0.304 |
| 21 | 0.324 |
| 22 | 0.345 |
| 23 | 0.365 |
| 24 | 0.386 |
| 25 | 0.406 |
| 26 | 0.428 |
| 27 | 0.450 |
| 28 | 0.471 |
| 29 | 0.493 |
| 30 | 0.515 |
| 31 | 0.534 |
| 32 | 0.561 |
| 33 | 0.583 |
| 34 | 0.606 |
| 35 | 0.629 |
I've fitted a polynomial to this data and created a graph of it.
| Type | Description | Power density W/m² | Space between radiator and wall mm | Projection from wall mm | Pipe centres from wall mm |
|---|---|---|---|---|---|
| K1 | Single panel, one set of fins | 1700 | 19 / 30 | 83 / 94 | 51 / 62 |
| P+ | Double panel, one set of fins | 2460 | 23 / 34 | 101 / 112 | 62 / 73 |
| K2 | Double panel, two sets of fins | 3130 | 22 / 33 | 124 / 135 | 73 / 84 |
| K3 | Triple panel, three sets of fins | 3980 | 22 | 180 | 73 |
Where two figures are given for distances from the wall these correspond to two possible orientations of the mounting brackets.
| Type | Description | Power density W/m² | Space between radiator and wall mm | Projection from wall mm | Pipe centres from wall mm |
|---|---|---|---|---|---|
| Type 11 | Single panel, one set of fins | 1710 | 19 | 85 | 50 |
| Type 21 | Double panel, one set of fins | 2320 | 31 | 101 | 66 |
| Type 22 | Double panel, two sets of fins | 3000 | 31 | 135 | 83 |
| Type 33 | Triple panel, three sets of fins | 4100 | 31 | 191 | 83 |
