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Re: PT 2 would like your input on alternative fuel
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Posted by buickanddeere on July 06, 2006 at 15:14:13 from (209.240.120.104):
In Reply to: PT 2 would like your input on alternative fuels posted by Truth seeker on July 05, 2006 at 15:10:34:
A HP is a HP is a HP.
The only place an electric motor wins is on surge loads that would stall an equal HP internal combustion engine. The electric slows down some, produces less back emf and stator/rotor current increases. This makes a stronger magnetic field and more torque.
A common induction motor makes max torque at around 75-80% of rated rpms. Lugged below and it "breaks down" and stalls quickly.
A steam reciprocating engine will make max torque at stall. Zero HP however even if it's putting 1000lb ft of torque into a shaft that isn't rotating.
Operation of an electric motor above it's rated capacity consistently will overheat it. Somewhat similar as you can over boost and overfuel a diesel or gas turbine and get away with it for a few seconds at a time.
As for constant power load? Internal combustion engines for continious work such as marine applications are derated. Sure they can make e.g. 500HP but their max continuous maybe 350HP. Some confusion arises from this.
The electric motor is rated for 100% and even 110 or 115% load.
All said if a shaft load is 100HP at 1740rpm. Doesn't matter internal combustion gasoline, diesel, reciprocating steam, gas,steam,wind turbine or electric motor.
The load will see no difference no matter what 1740rpm 100HP prime mover is turning it. The shaft HP will be 100HP.
I agree oil seeds have energy efficiency advantages over distillation of ethanol
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