General information Useful calculation data
7
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TI-GCM-13 CM Issue 3
Heating formulas
Equation
Use to calculate
Formula
3 600 h fg
1
=
kg / h
Steam load from kW heat rating
2
=1.3 a T
An air heater kW rating from the air flow and temperature rise
kW
An air heater steam load from the air flow and temperature rise and the steam pressure in the heater
4680 a T h fg
3
=
kg / h
The amount of heat needed to change the temperature of a substance
4
= m C p T
kJ
m C p T H 3 600
The mean heating load to change the temperature of a weight of substance over a stipulated time
5
kW
=
m
7.5 25
m C p T H 3 600
The heating load for a flow-type application like a heat exchanger
6
kW
=
W C p (T s - T a ) 60 h fg heat-up minutes
The mean steam load to heat steam pipework over a stipulated time (warm-up load)
7
kg / h
=
L 3.6 f h fg
The steam load for radiation losses from steam pipework (running load)
r
8
=
kg / h
U A T s 1 000
9
kW
=
The heating capacity of a heat exchanger or coil at start-up
11.5.22
U A T m 1 000
The heating capacity of a heat exchanger or steam coil when operating
10
kW
=
m
Table continued on next page
TI-GCM-13 CM Issue 3
Page 1 of 4
Heating formulas
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