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| francis_michael2001@yahoo.com 2005-09-29, 12:21 pm |
| Somebody claims to have developed a new reversible heat-engine cycle
that has th same theorotical efficiency as the Carnot Cycle operating
between the same temperature limits. is this a reasonable claim?
explain.
i need answer now...
can u..
tnx
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| In article <1128005223.544972.222110@g47g2000cwa.googlegroups.com>,
francis_michael2001@yahoo.com says...
> Somebody claims to have developed a new reversible heat-engine cycle
> that has th same theorotical efficiency as the Carnot Cycle operating
> between the same temperature limits. is this a reasonable claim?
> explain.
No. "You can't break even" and "you can't get out of the game" come to mind.
--
Keith
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| Beachcomber 2005-09-29, 1:21 pm |
| On 29 Sep 2005 07:47:03 -0700, francis_michael2001@yahoo.com wrote:
>Somebody claims to have developed a new reversible heat-engine cycle
>that has th same theorotical efficiency as the Carnot Cycle operating
>between the same temperature limits. is this a reasonable claim?
>explain.
>
>i need answer now...
>can u..
>tnx
>
Google "acoustic refrigeration". There have been some new
developments in this area using loudspeakers in place of mechanical
compressors to compress helium for a new version of the Sterling Cycle
process.
Perhaps that is what you heard off... Don't know about anything being
fully reversible though... That would violate the laws of
thermodynamics.
Beachcomber
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| On 9/29/05 7:47 AM, in article
1128005223.544972.222110@g47g2000cwa.googlegroups.com,
"francis_michael2001@yahoo.com" <francis_michael2001@yahoo.com> wrote:
> Somebody claims to have developed a new reversible heat-engine cycle
> that has th same theorotical efficiency as the Carnot Cycle operating
> between the same temperature limits. is this a reasonable claim?
> explain.
>
> i need answer now...
> can u..
> tnx
>
This question sure smells like a homework problem. It is reasonable the same
way as a Carnot engine is reasonable. If I explained, you would not learn
although you might get an unfair competitive edge when it comes to grading.
Bill
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| daestrom 2005-09-29, 7:21 pm |
|
<francis_michael2001@yahoo.com> wrote in message
news:1128005223.544972.222110@g47g2000cwa.googlegroups.com...
> Somebody claims to have developed a new reversible heat-engine cycle
> that has th same theorotical efficiency as the Carnot Cycle operating
> between the same temperature limits. is this a reasonable claim?
> explain.
>
> i need answer now...
Homework??
The Ericson cycle is theoretically equivalent to the Carnot. But it hasn't
been built with any degree of success. It requires that compression of the
fluid takes place at a constant temperature (i.e. heat is removed from the
gas *as* it is compressed), and similarly, expanded at constant temperature
(i.e. heat added continuously as the gas passes through the turbine).
But of course to have 'constant temperature' means you must have a heat
transfer rate that is very large (i.e. incredible heat transfer
coefficients, or incredibly large heat transfer surface).
daestrom
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