Quote:
Originally Posted by Daox
I'd like to see any SAE (or other) testing that shows how IAT effects diesel efficiency.
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I looked up some SAE papers, but it seems they want some money before they are willing to share.
There are some others I found that seemed very limited or incomplete, or just not applicable.
Here's some good information here:
http://rds.yahoo.com/_ylt=A0oGdHhPiU...el_ENVIRON.pdf
LINK
^The above paper is also not completely applicable for the following reasons:
1. It primarily highlights NOX production at a fixed load for the purposes of maintaining emissions compliance, not overall fuel efficiency of a road-going vehicle.
2. Though BSFC and NOX production are linked in that a faster burn rate can increase NOX, and also increase BSFC up to a point, BSFC is not directly linked to fuel economy in a road-going vehicle.
You can see by this that in fact both air temperature and water content do change the burn rate of the fuel, and therefore the emissions and power output of the engine.
I'm not really sure why, or if this was even in question though.
At least in my own company it is common knowledge that cooler, dryer, and more dense air will increase the maximum power output of an engine by increasing available oxygen, speeding up combustion under high load, and often increasing the VE of the engine as well.