charge air for engines
charge air for engines
(OP)
I am studying a design for test engine facility and would like help and inputs on the charge air cooling system.
The heat load was given as 150Kw and that is about it. I am wondering if there is a standard temperature drop used charge air in engines and if the air is typically compressed at all?
Any help would be appreciated.
The heat load was given as 150Kw and that is about it. I am wondering if there is a standard temperature drop used charge air in engines and if the air is typically compressed at all?
Any help would be appreciated.





RE: charge air for engines
The temperature drop on the charge air side is 'whatever you can get'. The temperature rise on the atmospheric side needs to be limited so that it doesn't cause problems for the radiator... say 10F if memory serves. Wait; it gets worse; the pressure drop on the air side also has to be limited, again so as to not interfere with the radiator's function.
The CAC is normally part of the engine 'package', so you may be talking about something else... perhaps a cooler to standardize the ambient air used in the test?
Mike Halloran
Pembroke Pines, FL, USA
RE: charge air for engines
Is there any rule of thumb if one knows the engine and heat load to get a rough estimate of the in and out temperature of the charge air??
RE: charge air for engines
RE: charge air for engines
But don't listen to me. Your Diesel's dealer should be able to bury you in information.
Mike Halloran
Pembroke Pines, FL, USA
RE: charge air for engines
RE: charge air for engines
Mike Halloran
Pembroke Pines, FL, USA
RE: charge air for engines
Mike's numbers seem pretty good to me as well.
RE: charge air for engines
RE: charge air for engines
Automotive/mobile engines typically use air-to-air exchangers because they're lighter, have less parts and the cooling medium/driving force is "free" and easily accessible.
A 13L diesel sounds like you're testing truck engines to me, which are mostly air-to-air cooled. If you're engine dyno testing these, the easiest method is to put an air-to-water charge air cooler, instead of air-to-air, so you can regulate the temperature better and don't need a huge fan. If they're on a chassis dyno the huge fan is easiest.
RE: charge air for engines
It shouldn't even be mentioned in a test facility spec.. except that the heat load is added to the wastewater stream for marine units, or to the ventilation exhaust for mobile units, or to either one for stationary units. That's probably why they didn't tell you much.
Mike Halloran
Pembroke Pines, FL, USA
RE: charge air for engines
"Heat rejection to aftercooler (kW)" is a common specification given by stationary engine manufacturer's but it is for sizing exchangers and/or systems that use the waste heat, not a conformance check specification. I'll have to check ISO 3046 though...