Re: Carnot Cycle ... here is an example of a good one

Post #41,528 by dmarker2 6/7/02 10:39:18 AM Reply	Re: Carnot Cycle ... here is an example of a good one Robert Stirling ... [link\|http://www.stirlingengine.com/faq/one?scope=public&faq_id=1\|Stirling Engines] "Q: Are Stirling engines really the most efficient engines possible? A: In the mid 1800's a very bright Frenchman named Sadi Carnot figured out the maximum efficiency possible with any heat engine. It is a formula like this (Temperature of the hot side - Temperature of the cold side)/Temp of hot side x 100 equals the max theoretical efficiency. Of course the temperatures must be measured in degrees Kelvin or Rankine. Stirling engines (with perfect regeneration) match this cycle. Real Stirling engines can reach 50 percent of the maximum theoretical value. That is an incredibly high percentage! " In the 1970s Ford built a Stirling engined motor car that was approx 30% more efficient on milage than a gasoline engine & unlike steam engines, would never explode like a bomb. But 30% was not enough to change from conventional engines. "Here is a picture of a 1979 AMC Spirit. It was equipped with an experimental Stirling engine powerplant called the "P-40". The Spirit was capable of burning gasoline, diesel, or gasohol. The P-40 Stirling engine promised less pollution, 30% better mileage, and the same level of performance as the car's standard internal combustion engine. " I have several models of these (accquired in the past 12 months from the US). They are fascinating conversation pieces. Cheers Doug
Post #41,599 by Ashton 6/7/02 6:35:04 PM Reply	We had one on the roof! at LBL. Then, a couple of years ago, I helped a friend (working at NASA - not a scientist) assemble some material on the topic. I haven't pursued enough to be entitled to an opinion re practicalities like... obscure alloy economics, tolerances - esp. tolerance of daily Joe Sixpack abuse of the "why do I Need to change the oil??' type. Amazing though - presuming merely an honest 30% in the mentioned AMC test bed. But do you find it surprising that it wasn't enough to interest a (any) Corp in further pursuit? As to your comment re the relevance of all this Other Stuff, to your IMO excellent XML analogy - guilty as charged. Still, the extrapolation fairly leaped to mind. (This mind). And I do realize that, in a meeting to relate present IT strategy to what seems to be coming down the pike: One obviously can't subpoena the CIEIO to explain his parachute, or why it is that - the rate of Temp hiring has increased exponentially, and the temps are engaging in Gladiatorial combat during their two 8-minute coffee breaks per shift, and ... Yes, we live in a Complete World\ufffd - only off or ex-work. This I have recognized. (And acted accordingly.) :-\ufffd Ashton Digressions R'Us LLC What Does It All Mean, Alfie ??
Post #171,019 by shimon340 8/26/04 7:07:14 AM Reply	Re: Carnot Cycle ... here is an example of a good one Hi dmarker 2, I'm very interested in these SMC spirits with the P-40 sterling engine. Do you have any further information on these engines or these cars? look forward to hearing from you Shimon shimon@volvo340.com posted by dmarker "Robert Stirling ... Stirling Engines [*] "Q: Are Stirling engines really the most efficient engines possible? A: In the mid 1800's a very bright Frenchman named Sadi Carnot figured out the maximum efficiency possible with any heat engine. It is a formula like this (Temperature of the hot side - Temperature of the cold side)/Temp of hot side x 100 equals the max theoretical efficiency. Of course the temperatures must be measured in degrees Kelvin or Rankine. Stirling engines (with perfect regeneration) match this cycle. Real Stirling engines can reach 50 percent of the maximum theoretical value. That is an incredibly high percentage! " In the 1970s Ford built a Stirling engined motor car that was approx 30% more efficient on milage than a gasoline engine & unlike steam engines, would never explode like a bomb. But 30% was not enough to change from conventional engines. "Here is a picture of a 1979 AMC Spirit. It was equipped with an experimental Stirling engine powerplant called the "P-40". The Spirit was capable of burning gasoline, diesel, or gasohol. The P-40 Stirling engine promised less pollution, 30% better mileage, and the same level of performance as the car's standard internal combustion engine. " I have several models of these (accquired in the past 12 months from the US). They are fascinating conversation pieces. Cheers Doug" shimon@volvo340.com

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