how fast will it be?

nyha · Dec 26, 2004

can any of you guys help me?
I’m doing some work for African NGOs and am a bit stuck.
They say 5hp gasoline engines or 15 hp diesel engines are available as power source.
how much power would that be? and how fast would it be? (rpm) /forums/images/graemlins/confused.gif
obviously it will depend on the engine but i just want very general estimate.
i'd appreciate any help

bczoom · Dec 26, 2004

nyha,

Welcome to TBN!
Are these engines going to be attached to a generator?

nyha · Dec 26, 2004

to tell you truth, i dont know anything other than what i stated above.. -.-;

what they are saying is they already have above engines and want me to use same or similar engine.

i guess that engines would have to attached to a generator.
which kind of generator, i have no idea....
/forums/images/graemlins/confused.gif /forums/images/graemlins/crazy.gif

mark777 · Dec 26, 2004

nyha,

I think members here need just a little more information to be of any help.

Forgive my ignorance, but what is African NGOs....Is this a company that has existing equipment that want you to re-fit engines? Are there any engines with existing rpm ratings currently installed on this equipment?

I would make a guess on a diesel at 15 HP the RPMs may be between 2300 to 2700 hundred RPM, depending on it being a two or three cylinder engine. Difficult to help with so little to go on.

Good Luck, Mark

Cliff_Johns · Dec 26, 2004

( Forgive my ignorance, but what is African NGOs....Is this a company that has existing equipment that want you to re-fit engines? )

NGO is Non-Governmental Organization -- usually, but not always not for profit organization, politically independant, that helps out where help is needed in the world. Relief agencies and the like.

Cliff

OkeeDon · Dec 27, 2004

nyha said: "...and want me to use same or similar engine." 

Ah. Use it for what? If you're going to do the work, I think you're going to have to know what the engine is intended to do. And, so will we in order to help you.

fractal · Dec 27, 2004

A rule of thumb I have heard many times is you need 2hp of motor for every kw you generate. Now technically 1hp is just over 750 watts but there are some gross inefficiencies in motor generators. You can reasonably expect to generate 2.5 kw from a 5hp gasoline motor and 7.5 kw from a 15hp diesel motor.

As for speed, gasoline motors driving gensets typically run at 3600 rpm. Diesel motors are often run at 1800 rpm to run a genset. Again, it depends on the power curve for the motor and a bunch of other things. In general, the slower you run the motor the longer it will last. You will also need the proper belts and pullies or gear arangements to derive the proper RPM at the generator to get the target ac frequency. Some sort of govener will be needed on the motors to keep the motors at the proper speed. Better equipment uses feedback from the generator to control the govener.

Is this what you were asking?

rambler · Dec 30, 2004

( A rule of thumb I have heard many times is you need 2hp of motor for every kw you generate. Now technically 1hp is just over 750 watts but there are some gross inefficiencies in motor generators. You can reasonably expect to generate 2.5 kw from a 5hp gasoline motor and 7.5 kw from a 15hp diesel motor.

As for speed, gasoline motors driving gensets typically run at 3600 rpm. Diesel motors are often run at 1800 rpm to run a genset. Again, it depends on the power curve for the motor and a bunch of other things. In general, the slower you run the motor the longer it will last. You will also need the proper belts and pullies or gear arangements to derive the proper RPM at the generator to get the target ac frequency. Some sort of govener will be needed on the motors to keep the motors at the proper speed. Better equipment uses feedback from the generator to control the govener.

Is this what you were asking? )

But sometimes they drive water pumps as well???? All very strange. A 5hp gasoline engine has 5 hp & turns a bit faster, a 15 hp engine has 15 hp and turns a bit slower.

Nothing else here really makes any sense?

--->Paul