Civil Engineering Reference
In-Depth Information
Table 7.5
Comparison between two electric motors with different efficiencies (Example 3)
Standard-efficiency motor
55 kW
Rated output power
Output
Working hours
Efficiency
Input
% of rated capacity
kW
h/year
%
kW
kWh/year
80
44
5,000
86
51
255,814 (
a
)
High-efficiency motor
55 kW
Rated output power
Output
Working hours
Efficiency
Input
% of rated capacity
kW
h/year
%
kW
kWh/year
80
44
5,000
90
49
244,444 (
b
)
Energy saving (
a
)
(
b
)
kWh/year
11,370
