Calculation
For Velta heating systems the heat requirement of the building, is calculated
in accordance with standard practice, including the loss through the floor,
the Velta computer program or calculation graphs/tables are then used
to create the underfloor heating specification.
Layout
The value qspec in the tables refers to the floor surface.
Since the heat losses downwards stem directly from the 'Pipe-in-Floor'
pipes, the heat loss of the floor itself does not need to be brought forward
from the floor heating area. For the calculation of the heat requirements
of the room, it can thus be subtracted from the heat requirement; but
must be allowed for when establishing the total quantity of heat required
from the heat source.
The heat requirement can be calculated as follows for
the laying-out of the floor heating area:
|
Qn = Heat requirement in watts. |
Qcor= Floor Heat Loss (Watts) |
|
Qh = Corrected heat requirement in watts |
Ah = Room area |
To determine the specific heat requirement of the floor
(heating area) per m2:
Check symbols Calculated heat requirement is Qh = (Qn-Qcor)/Ah ( in W/m2)
Partial Loading
Where there are large differences in room heating requirements within
one installation, it is necessary to employ partial loading, through the
use of variable heating pipe spacing.
These are the spacings employed:
|
Vz30 |
300mm spacing between pipes |
- Standard Layout |
|
Vz20 |
200mm spacing between pipes |
- increased output layout |
|
Vz10 |
100mm spacing between pipes |
- maximum normal output layout |
|
Vz5 |
50mm spacing between pipes |
- only used for border zones and in certain cases for bathrooms |
