INSULATED PIPES APPLIED IN THE GROUND
Required power:
Are stated in W/m pipe and is calculated as per below:
Pm = 2 x Π x k x mt x 1.2 / ln (dy / di)
| Pm | = | Required power in W/m. |
| k | = | The heat permeability of the insulation in W/m°C For mineral wool = 0.045 |
| mt | = | The surface temperature depending on the climate zone and depth of trench (see table) |
| dy | = | The outer diameter of the insulation. |
| di | = | The interior diameter of the insulation. |