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Cooling the intake air charge is a know way to increase the power of any engine, but it is especially useful in supercharged or turbocharged engines. Most supercharger intercoolers use engine coolant (at probly close to 200 degrees F), while units for turbo cars generally use air-to-air. Why not have
the air flow through a condenser from an air conditioning unit into the engine? It would be the same principal as a normal A/C unit, but without the fans blowing the air into the passenger compartment. It would just go directly into the throttle body.
I realize that the compressor reduces useable engine power, but since there is a direct inverse link between intake air temps and horsepower, I think that the extra power would be more than what is taken to drive the compressor. According to Gale Banks Engineering, the ratio is 1.8% HP gain for every 10 deg. F drop. I have heard that the average A/C compressor takes 5 HP, so on a 300 HP engine, a 10 deg drop would already produce 5.4 HP more than before. If an air to air intercooler can trop temps by 20-40 deg, how much more could some type of refrigerant reduce the temp? (R-134a may not be the best, but would be practical given its availability).
This system would most likely be used only on high performance race engines, not neccesarily grandma's supercharged Buick.
OK, A/C experts, let me have it: why won't it work?
Bank's Engineering
http://www.bankspow...om/tech_coolair.cfm
Interesting site for diesel power, as well. [Hunter79764, Jun 26 2006]
[link]
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this sounds like an attempt at perpepual
motion. you forget to factor in that the
A.C. would have to work harder to cool the
intake and the interior of the car because
once the air passes through the engine it's
not cool anymore. |
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I'm croissanting this for creativity, and because it looks like [tcarson] fishboned while really confused. It can be considered an odd type of supercharger, but it isn't perpetual motion. |
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yea, because it has an external fuel source, which is the combustable gas. |
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i didn't actually bone it. i was confused so i
with held my vote. |
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It should work, as long as you can get rid of the excess heat being generated. Really what you're describing is a air-to-water intercooler with a refrigeration unit in the water. |
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The problem is managing the extra heat generated--you've still got to dump the intake heat somewhere, and you're adding onto that the heat of the refrigeration unit. In the end, the only option is a radiator cooled by atmospheric air, which will have to be sufficiently larger to accomodate the extra heat. Is the extra weight/drag worth it? I dunno. |
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5th has the right idea. If a stock water to air intercooler could handle the pressure, it would be an ideal starting point, but considering the pressure involved in an A/C system, i think you would blow something. And car A/C systems already have a radiator (possibly goes by a different name, its just not coming to me at the moment) built in, usually located just in front of the engine radiator. An oversized unit would be beneficial, but not neccesary. (my best idea was to take an A/C system from an SUV (since they generally have better cooling systems to cool a much larger space than a car) and modifying it for use in a high performance car of some sort. While putting it in the intake itself, such as GM does with its Roots-type supercharged/intercooled 4 and 6 cyls, may have some benefits, I think the easiest way would be to fab up a box, post-turbo, pre-intake, with the stock condenser in it, forcing the air to pass over as many of the fins as possible. As far as having too much heat to dissapate, it would not be all that much more than your factory unit has to dissapate. It may put a strain on the system to work hard enough to cool 200+ deg air, but the system could easily have a switch to turn on and off, just like your regular unit. And its not going to cool the air to a comfortable 72 deg. All that you need is enough to allow more boost without getting detonation. Next time you get in your car, think about how hot the ambient air is outside (easily 110 where I live) and think about how cold the air coming out of vents is, then think about all that heat dissipating right in front of your radiator. But it still works decently enough, right? |
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And just to clarify, the system would not be used to cool the passenger compartment any longer. Independant second system? Should work, given an engine bay large enough. |
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You said it would most likely be used in high-performance race engines. When was the last time you saw a race car with air con? |
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Many of them that I've seen around HAD air con, they just cut the belt, unbolted the compressor, and used the A/C radiator (still can't think of a special name for it) as an engine oil cooler or aux. transmission cooler. OK, so my definition of a race/high performance car isn't a Le'Mans car, its an old beat up Chevy. But it should still work on your average weekend drag racer or stoplight machine. |
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Don't pay much attention to my ramblings. I fall squarely in the latter half of the balance you have insightfully alluded to in your profile page. |
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/A/C radiator (still can't think of a special name for it)/ |
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OK, sounds right. Then what's the other half called? Maybe evaporator? I don't know. Most of the time I'm on here, it's already too late at night and I'm constantly short on sleep. So if thats it, sorry for any confusion I caused. |
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Hey hunter, I tried to email you about an Idea of mine you liked, but it didn't work. See if you can send me a line... or just check my idea for a new link. |
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