as i asked the experts before about useing automotive radiators as hydraulic oil cooler,

i just want a rough idea,

is there going to be any diffrence in coling performance if air flow remains the same, with hydraulic oil and coolent fluid .

from few another experts i found out that radiators used with 50 hp diesel engines are capeble of disspancing 50 hp of heat, becouse the diesel engines are only 35% efficint and rest of the energy is devided equelly between exaust pipe and radiator.
(that mean the fuel has energy of 150 hp , but engine producing just 50 at drive shaft ,50 is going in exaust and 50 in radiator)
does that mean if i have a hydraulic system of 50 h.p.s and all the power going to become heat becouse of pressure relief valve( at least 50% of working time) i can put a 50 hp diesel engine,s radiator in hydraulic line and run that system cool.

This message has been edited. Last edited by: rock,

For your diesel engine, you point out 65% of 50 hp, or 33 hp is heat. Half of that or 16 hp is rejected by the radiator.

In a well-designed industrial hydraulic system you may need to reject about the same amount or a bit more. In a well-designed mobile system, you may need to reject quite a bit more, depending on design elements like size of reservoir, etc.

Most any manufacturer of radiators will help size the radiator.

from racing car experience an oil cooler is often about 1/3 the area of the water radiator and even the older Suzuki GSX-R of the 80's that was heavily reliant on internal oil cooling for the whole engine's cooling only had a radiator for the oil half the size of a typical water one.

http://en.wikipedia.org/wiki/S...SX-R750_.28F.29_1985