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Design & Selection
3 Selection of the Underfloor Coils
3.1 Calculation of Unit Load for Floor Heating
Dining Room
Mater Room
Guest Room
Study Room
Dining Room
Mater Room
Guest Room
Study Room
Notes
Villas whose load is generally larger than the houses should take the value between the middle and the
①
maximum empirical values listed above.
The top lever whose load is generally larger than the middle or bottom layer should take the maximum
②
empirical value.
The guest room whose load is generally much large should take the value between the intermediate and
③
the maximum empirical values listed above.
For those whose external walls or glass areas are large, it is recommended to take the load calculation.
④
The heating load for the bathroom is generally 500W/room.
⑤
3.2 Selection of Tube Spacing of the Underfloor Coils
Tube spacing of the underfloor coils which will directly affect heat dissipation of the floor depends on the
tube material, indoor design temperature, supply water temperature and floor material.
(Tube material: PE-X, Indoor temperature:18°C, Average water temperature:45°C)
Floor Material
Thermal Resistance
2
m
·K/W
Stone
0.02
Wood
0.075
The dissipated heat of the floor coil is larger than the load for the floor heating system; however the
deviation cannot be larger than 10%.
3.3 Selection of Loop Quantity of Coils for Each Room
3.3.1Type of Underfloor Coils
When selecting underfloor coils, we should consider both their comfortability and heating capacity. The most
commonly used coils are as shown below.
Length of coils are calculated as below:
Square-shaped coil: =L*W/tube spacing=area/tube spacing
U-shaped coil: =L-1+L*W/tube spacing=L-1+area/tube spacing
The reason why the square-shaped coils are recommended is because they can keep even temperature
Empirical Values of Floor Heating Load Per Square Meter
Heat Dissipation of Commonly Used Coils
Tube Spacing
mm
200
200
Square-shaped Coil (Recommended)
2
House W/m
Villa W/m
2
Heat Dissipation
2
W/m
147.0
111.2
U-shaped Coil
4
100~120
100~110
110~130
90~110
110~140
100~120
100~130
100~120
Tube Spacing
Heat Dissipation
mm
W/m
150
159.8
150
117.8
2