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Heat Gain from Electrical Motors in Continuous Operation

Heat transferred from an electrical motor to the ambient room - different locations of fan and motor

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Electrical motors in air condition systems contributes to the heat loads in air condition systems and will influence on the dimensions of cooling equipment.

Heat loads from electrical motors and fans in different locations can be estimated from the table below:

Shaft Output
(kW)
Full Load Electrical Motor Efficiency
- η -
(
%)
Electrical Motor Input
(kW)
Location of Fan and Motor
1
Motor and Fan in the Inlet Air Flow or in the Room
(kW)
2
Motor Outside the Air Flow or Outside the Room. The Fan in the Inlet Air Flow or in the Room
(kW)
3
Motor in the Room. The Fan in the Outlet Air Flow
(kW)
0.05 40 0.13 0.13 0.05 0.08
0.07 46 0.15 0.15 0.07 0.08
0.10 55 0.18 0.18 0.10 0.08
0.14 60 0.23 0.23 0.14 0.09
0.20 64 0.31 0.31 0.20 0.11
0.28 66 0.42 0.42 0.28 0.14
0.40 70 0.60 0.60 0.40 0.20
0.56 72 0.78 0.78 0.56 0.22
0.80 76 1.05 1.05 0.80 0.25
1.1 80 1.38 1.38 1.1 0.28
1.6 80 2.0 2.0 1.6 0.40
2.5 81 3.1 3.1 2.5 0.60
4.0 82 4.9 4.9 4.0 0.90
5.6 84 6.7 6.7 5.6 1.1
8.0 84 9.5 9.5 8.0 1.5
11.2 86 13.0 13.0 11.2 1.8
16 87 18.4 18.4 16 2.4
20 88 22.7 22.7 20 2.7
25 89 28.0 28.0 25 3.0
32 89 36.0 36.0 32 4.0
40 89 45.0 45.0 40 5.0
50 90 56.0 56.0 50 6.0
63 90 70.0 70.0 63 7.0
80 90 89.0 89.0 80 9.0
100 91 110 110 100 10.0
  • 1 kW = 1000 Watts = 3412 Btu/h = 737.6 / 550 British hp = 1.341 British hp = 103/9.80665 kgf m/s = 737.6 ft lbf/s = 103/(9.80665 75) metric hp
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