An electric motor with a maximum output of 75 hp (horse power, English: hp, horse power) on the axle has an efficiency of 91%. It will be replaced with a new motor, which has the same maximum shaft power, but an efficiency of 95.4%. The old engine has been in operation for 5000 hours per year with at 80% of its maximum effect (ie '80% load' or '80% load factor'). The new engine must run with the same load and the same number of hours. a) How much electrical energy is saved per year by replacing the old one with the new motor? b) How much expenditure on electricity is saved by replacing the old with the new motor when electricity price is $0.14/kWh?
An electric motor with a maximum output of 75 hp (horse power, English: hp, horse power) on the axle has an efficiency of 91%. It will be replaced with a new motor, which has the same maximum shaft power, but an efficiency of 95.4%. The old engine has been in operation for 5000 hours per year with at 80% of its maximum effect (ie '80% load' or '80% load factor'). The new engine must run with the same load and the same number of hours. a) How much electrical energy is saved per year by replacing the old one with the new motor? b) How much expenditure on electricity is saved by replacing the old with the new motor when electricity price is $0.14/kWh?
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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An electric motor with a maximum output of 75 hp (horse power, English: hp, horse power) on the axle has an efficiency of 91%. It will be replaced with a new motor, which has the same maximum shaft power, but an efficiency of 95.4%. The old engine has been in operation for 5000 hours
per year with at 80% of its maximum effect (ie '80% load' or '80% load factor'). The new engine must run with the same load and the same number of hours.
a) How much electrical energy is saved per year by replacing the old one with the new motor?
b) How much expenditure on electricity is saved by replacing the old with the new motor when
electricity price is $0.14/kWh?
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