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#16
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Also, where are you finding 30*C at? The lowest outlet temp on the chart I seen was 49*C Last edited by imdavid28; 03-14-2006 at 09:07 PM. |
#17
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Here is an idea to lower your intake temps even further. Use a BIGGER intercooler, place it in the best possible airflow, isolate it from all engine/cooling system heat, and use a compressor that best suits the engine.
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#18
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#19
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As far as the throttle position argument goes, with a turbo charged engine you don't have high boost numbers at low rpms, hence you don't have high inlet temperatures either. If you look at the graphs in the report, he charts them in engine power output from 110kW to 150kW. He also keeps the inlet temps almost constant 30 degrees C over this range. Emissions control is becomming very very important to manufacturers. NOx emmissions in particular. They are throwing more and more money at it. Reducing the intake charge temperature is one of the more effective ways. Brandon's intercooler dropped his EGTs by 200 degrees F. In this case, since it was a gasser, the exhaust manifold temps did not drop much from looking at the table(four places down from the BSFC below the intake manifold temps). Also while googling, I found that the guy who wrote this report is going to be presenting another paper on this at a conference at the end of the month. I think he is going to give out some more numbers on actual engines. Quote:
While I was looking this turbo expansion concept up in my thermodynamics book, I came up with the idea of using an absorbtion cooling loop. These systems are driven by heat alone. The temperatures encountered fall into the range of making this feasible. The big problem is these systems don't like being pulled every which way by G-forces. Another problem is the substances that need to be used (anhydrous amonia) the legality and saftey of putting them in a vehicle. They use these systems in some RV refrigerators so its not a insurmountable problem.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons ) white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank) desert storm primer 63 T-bird "The Undead" (long term hibernation) http://ecomodder.com/forum/fe-graphs/sig692a.png |
#20
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__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons ) white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank) desert storm primer 63 T-bird "The Undead" (long term hibernation) http://ecomodder.com/forum/fe-graphs/sig692a.png |
#22
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I'm an ass
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I was assuming that first device after the first intercooler was a tubine, while the last device was a compressor. So essentially you would be cooling the air, decompressing it, possibly heated by the second heat exchanger, and then compressed on top of that. Therefore, nothing was making any sence. Quote:
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Last edited by imdavid28; 03-15-2006 at 07:59 PM. |
#23
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turbo
I saw a guy running a diesel, dodge truck with a cummins... he
had installed 2 turbos... one was normal and the other was from a tractor trailor.... the smaller turbo provided the preasure to run the larger turbo. The larger tractor trailer turbo provided the preasure to the engine.... and this old boy was a hay seed.... but i think he had these scientist beat..... and if you just want a good intercooler then go to a junk yard or to ebay and buy the one from a saab 900.... probably the best one going... |
#24
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He is just using it to show case the technique. As I have stated before, the rest of the engine has not been optimized to take advantage of the cooler intake temps. After tweaking the engine and adjusting the intake cooling to optimize toward some goal other than demoing the cooling itself, I would expect to see signifigant gains. BTW, your not an ass, your learning.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons ) white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank) desert storm primer 63 T-bird "The Undead" (long term hibernation) http://ecomodder.com/forum/fe-graphs/sig692a.png |
#25
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No, honestly, should of know better. My thermo final is next Thursday. But thats a whole other story...
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