Electrical Motors and Heat Loss

Heat gain from electrical motors to the surroundings

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Heat loss from electric motors during operation can be indicated to

Size of Motor
(kW)		 Heat Loss
(Watts/kW)
0 - 2 250
3 - 15 150
15 - 150 100
150 - 80
  • 1 kW = 1.34 hp
  • 1 hp = 0.746 k W

Alternative - with Imperial Units 

Nameplate Rating Motor Efficiency
Average		 Heat Loss to Room Air (Btu per Hr per Rated Hp)
(Hp) Motor in Room
Driven Device inside Room 		Motor in Room
Driven Devise Outside Room 		Motor Outside Room
Driven Device inside Room
1/8 to 1/2 0.60 4250 1700 2550
1/2 to 3 0.69 3650 1100 2550
3 to 20 0.85 2950 400 2550
  • 1 Btu/h = 0.293 W 

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Related Topics

  • Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units

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