Unit Control
The reason why the square-shaped coils are recommended is because they can keep even
temperature distribution. Special demand can be met by adjusting the tube spacing.
Distance from the room to the water trap/collector should be estimated according to the actual
conditions of the project and generally should not exceed 30m.
3.3.2 Selection of Loop Quantity for Each Room
Length of a single loop should not exceed 100m. If so, it should be divided into multiple loops.
Area of a single loop=tube length×tube spacing=100m×150mm=15m
2
Length of underfloor coils is recommended to be within 100m and length of each branch should be
kept the same to the most extent.
4 Quantity and Location of the Water Traps and Collectors
The water trap (collector) is a kind of device for distributing water for the water supply and return
tubes.
4.1 Design Requirements on Loop Quantity for Circulation Water
(1) One water trap (collector) is allowed for at most eight loops. When quantity of loops exceeds 12,
then two traps (collectors) should be used, or it will cause uneven water distribution.
(2) The maximum flow rate of the water trap (collector) should be less than 0.8m/s.
(3) The inlet and outlet of each loop should be connected to the water trap (collector) and the inner
diameter of the water trap (collector) should be or larger than that of the main water
supply/return tube.
Calculation of loop quantity for circulation water can be done as per the formula below:
N=A/A1
N——loop quantity
A—— total floor heating area (unit: m
2
)
A1—— floor heating area per single loop (unit: m
2
)
Example for how to calculating the floor heating area per single loop: when the tube length is 120m,
and tube spacing is 200mm, then the floor heating area per single loop is 120×0.2=24m
2
.
(4) One trap (collector) cannot be used for different floors, or it would cause uneven water
distribution.
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