Heat Gain from Electrical Motors in Continuous Operation

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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:

Electrical Motors - Heat Gain with Continuous Operation
Shaft Output (kW)	Full Load Electrical Motor Efficiency - η - (%)	Electrical Motor Input (kW)	Location of Fan and Motor
Shaft Output (kW)	Full Load Electrical Motor Efficiency - η - (%)	Electrical Motor Input (kW)	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