How to calculate the heat rejection from 700 Hp motor with .95 eff?

[SaraChem]

Would it be as 700 hp/.95= 736 hp which mean 36 hp as heat rejection??

 

[LittleInch]

If the output of the motor was exactly 700hp then yes.

Highly unlikely to be exactly 700hp though.

Check FLC and work out the max electrical input as a check

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[itsmoked]

And, don't forget a lot of the motor's output could appear as heat in the space around what its driving.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[QualityTime]

Standard horsepower ratings for electrical motors - 1 to 4000 hp are: 1, 1.5, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 3000, 3500, 4000.

The 700 HP is known as the connected load. For initial estimating purposes it is easier to use what you have done to determine the motor reject heat load into the room

If the ACTUAL load is for example, 635 HP, the reject heat load into the room is 31.75 HP (0.05 x 635). You should know what the actual load is. Just make sure that whether you are trying to do heating or cooling calculations your equipment has adequate turn down capabilities. The biggest mistake is to oversize things. It is better to have multiple pieces of equipment that can be brought on line to get better control and flexibility.

 

[SaraChem]

Thank you for all the replies! appreciate it