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Australian Hydronic Supplies
10 Frankston Gardens Drive
Carrum Downs, Victoria,
Australia 3201
5.0 Useful information
5.1 Water flow rates
Water flow rates can be calculated from the following formula:
Water Flow (l/s) = KW / x 4.187 x temp change
o
K - (K usually 10 – 15
o
K)
KW = water flow (l/s) x 4.187 x temp change
o
K
As a guide, water velocity in pipes should not exceed:
Residential – 0.7 M/s Industrial – 1.0 M/s
With a maximum pressure drop not exceeding 30kPa
Velocities and pressures above this will cause noise, erosion and circulation problems.
This will depend on the type of circulator used, the project conditions and function.
5.2 Heat load calculator
The following formula can be used to calculate the heat load of the room:
Room - Length x width x height x Factor
1000
Where factor =
for bedrooms
40
for living rooms
50
Using the same example room:
a bedroom - 5 x 4.5 x 3 x
40
=
2.7 kW
a lounge - 5 x 4.5 x 3 x
50
=
3.4 kW
This means a living room would be warmer than a bedroom.
This method gives an approximation only. A full heat load calculation should be
done by a suitably qualified heating engineer.