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#333300 - 05/28/08 04:29 PM Re: It's a Mad, Mad, Mad Max World
Dark Helmet Offline
Stormy's Lawyer

Registered: 03/20/08
Posts: 28
Quote:

I think the airconditioning takes a big slice of the efficiency. But I'm no engineer either.




If I remember correctly, a typical rotary A/C compressor uses about 1.4 hp. Older piston style compressors like York brand compressors used significantly more.

Another twist is that many newer compressors are variable displacement and can vary the amount of power needed to run based upon the cooling load, so they're more efficient when you don't need as much cool air. Older compressors would cycle on and off using their clutch as more high side pressure was needed for the A/C.


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#333301 - 05/28/08 05:51 PM Re: It's a Mad, Mad, Mad Max World
Gigi Offline
Porn Fucking Master

Registered: 05/18/06
Posts: 3555
^^^ thanks, mr. cash
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#333302 - 05/29/08 12:52 AM Re: It's a Mad, Mad, Mad Max World
freestylah Offline
Porn Jesus

Registered: 12/28/07
Posts: 4856
Loc: The 4th International
Bornyo quoted:

Quote:

Windows down vs. air conditioning

"Urban puzzle": it is more efficient, on a hot day, to run with the A/C on and windows up than to run with windows down (b/c of increasing car's drag).

Computer-based mpg measurements: * 11.7/11.8 with A/C on and windows up * 11.7/11.8 with A/C off and windows up * 11.3 with A/C off and windows down

So, according to the computer, it's better to use A/C with windows up.
<snip>
Jamie's A/C car ran out of gas first -- Adam's windows down SUV ran for another 30 laps -- completely contradicting the computer mpg estimate. Computer estimate based on air flow into the engine, so it would appear that it is unable to properly model the difference between A/C and windows down.

Mythbusted




OK, so this indicates that A/C takes a slice of efficiency. This is also my hands-on experience, even though it's far from extensive.
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#333303 - 05/29/08 01:18 AM Re: It's a Mad, Mad, Mad Max World
Ivor Biggun Offline
Kurt Lackwood's Fluffer

Registered: 10/09/04
Posts: 1176
Quote:

OK, so this indicates that A/C takes a slice of efficiency. This is also my hands-on experience, even though it's far from extensive.




Anything powered in your car is going to take a slice of the engine power, be driven directly off the engine, or placing an electrical load via the alternator. This even applies to things like the radio.

A/C just happens to be something that uses a significant amount of power, whereas others tend to be too trivial to notice.
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#333304 - 05/29/08 09:45 AM Re: It's a Mad, Mad, Mad Max World
Bad Habit Offline
Kurt Lackwood's Fluffer

Registered: 01/18/06
Posts: 1283
Loc: SoCal
Quote:

Quote:

OK, so this indicates that A/C takes a slice of efficiency. This is also my hands-on experience, even though it's far from extensive.




Anything powered in your car is going to take a slice of the engine power, be driven directly off the engine, or placing an electrical load via the alternator. This even applies to things like the radio.

A/C just happens to be something that uses a significant amount of power, whereas others tend to be too trivial to notice.




All of these are minor drags on engine efficiency when you consider at least 70% of the energy used is wasted as heat.*
Use the fuel more efficiently and the rest of this becomes moot.

*Source: http://en.wikipedia.org/wiki/Engine_efficiency
_________________________
I'd rather be ignorant than stupid. Ignorance implies a lack of knowledge which is easily correctable through education. Stupidity implies an inability to learn. Therefore; ignorance is temporary, stupidity is forever!

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#333305 - 03/26/11 01:17 PM Re: It's a Mad, Mad, Mad Max World
Steezo Offline
Porn Jesus

Registered: 01/11/06
Posts: 5287
Loc: Anchorage, Alaska
And we just hit the magic $4.00/gallon mark again. Time to buy another locking gas cap.
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"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars." - Martin Luther King, Jr.

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#333306 - 03/26/11 02:01 PM Re: It's a Mad, Mad, Mad Max World
Anonymous
Unregistered


Yet another reason to get rid of Qaddaffi sooner rather than later, yes? Sooner he's gone, sooner prices return to normal.

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