General information Useful calculation data
7
Terms
Units
Definitions
kW
kJ / s
Rate of heat transfer
L
m
Length of pipe run
m
kg
Mass
kg / h
Mass flowrate
P 1
bar a
Upstream pressure
P 2
bar a
Downstream pressure
Q
kJ
Amount of heat added to raise temperature
kW
Rate of heat transfer
kW
Mean rate of heat transfer
m
W / m (watts per metre of pipe)
Radiation loss from pipework
r
U
W / m 2 °C
Overall heat transfer coefficient
7.5 28
m 3 / s
Volumetric flowrate of air
a
m 3 / h
Volumetric flowrate of water
w
W
kg
Weight of pipe being heated
TI-GCM-13 CM Issue 3
Page 4 of 4
Heating formulas
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