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HEAT LOSS CALCULATOR
Last updated 23 July 2009.
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If a room were perfectly insulated, it would need no heating
– its temperature would rise to the body temperature of the
people inside. Rooms only need heating because they lose heat to
the outside world, so that the function of a heating appliance is
to replace the lost heat.
To calculate the size of heater needed, we need to know how much
heat is being lost through the surfaces of the room (walls,
windows, floor etc) and by draughts of fresh, cold, from outside.
Loses from surfaces are commonly expressed as 'U-Values'. High
U-values mean bad insulation and lots of heat lost, low U-values
mean less heat lost. The calculation is a simple one: the area of
surface (in square metres) multiplied by the U-value, multiplied
by the difference in temperature between the inside and outside,
gives the loss of heat in Watts (per hour). To find the
approximate heat requirement of a single room, fill in the white
boxes below in metres and ºC and choose the typical U-values
from the table, or from more accurate architects data. A sample
room with three outside walls has already been entered.
TIPS:
To quickly find the heat requirement of a whole building, treat
it as a single room.
For L-shaped rooms – calculate as 3 separate rooms