[elektro] villanyautó

[Xorn]

2009/5/19 jhidvegi <jhidvegi at gmail.com>:
> Xorn wrote:
>
>> Azok akkor mukodnenek jol, ha nagy a homersekletkulonbseg.
>
> Itt mit jelent, hogy nagy?

Eccer:

"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."

Masodszor viszont:

Stirling engines that run on small temperature differences tend to be
very large for the amount of power they put out. While we clearly
could build engines that produce power and ran on small temperature
differences, here's why we have not chosen to do that. Engines that
produce power and run on small temperature differences can be built,
but they will be large (usually unpractically large) for the amount of
power they put out.

A good general guideline is that if the hot side of the engine is not
at least 500 deg. F. (260 deg. C) the engine will be too bulky for the
amount of power it puts out.

Best regards,
Andy