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*To*: Dave Lawson <dlawson@ball.com>*Subject*: Re: McMath*From*: Dave Weiss <dzweiss@worldnet.att.net>*Date*: Wed, 25 Jun 1997 21:50:35 -0700*CC*: Scott Justusson <QSHIPQ@aol.com>, Quattro List <quattro@coimbra.ans.net>*Sender*: owner-quattro@coimbra.ans.net

Dave Lawson pointed out a small error in my numbers: incorrect T2i in the calculation of T2. The two methods actually come out pretty close (too close for coincidence). Since efficiency is a pretty basic definition in thermodynamics, it would follow that the compressor efficiency = (ratio of ideal to actual temperature gain) equation might just work because we're assuming an ideal gas. Indeed, that's the case! So, don't mess w/ the complicated version, use Dave Lawson's method. The turbo mfrs do... :-) To understand what's going on, you need to recognize that the cold side wheel does "useful" work to compress the air, and "useless" work that just heats it up. Efficiency is the percentage of total work done on the air that's useful. From there, it's "plug and chug". For the derivation, see alt.math.complicated. Hint for masochists: R = cp - cv. Sorry for the confusion! Dave Weiss '91 V8 5-spd '93 90 CS UnQ

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