Michel Jullian wrote:
> I think you're right on this Paul, however you're unnecessarily rude as usual.
That's just your interpretation according to a POV of common social behavior.
That's a result of being programmed by society. What you refer to as rudeness I
refer to as bluntness with very little attached emotions. On occasion I
practice the art of tiptoeing around ones emotions, which is what society refers
to as common social skills, but it requires unnecessary time and energy.
> Anyway I don't think that rectifying the hot resistor noise with a diode
breaks 2LoT. Does a photovoltaic cell (which is a diode too) break 2LoT when
converting the thermal energy radiated by a 6000°C black body to electricity? In
both cases there is a cold source somewhere, not everything is at the
temperature of the hot source.
Michel, once again there is a vast difference between a law and an
interpretation of such a law. If you adhere to a stricter interpretation of the
2nd law then yes, the solar cell breaks such a law. At 300 K a flat 1 x 1 m^2
of material emits 203 nW of radiation between 1600 nm and 400 nm on one side.
New technology allows photovoltaic cells to efficiently capture up to 1600 nm
wavelengths. The 203 nW is a conservative figure since I did not include
ultraviolet photovoltaic cells. How much of that 203 nW depends on the
efficiency of the cell. As to how much such a cell will capture is irrelevant.
Fact remains that a photovoltaic cell will convert room temperature black body
radiation to DC, which could charge a capacitor. That is storing ambient
temperature energy to a capacitor, which will indeed drop the net temperature in
the closed system. Understandably even present leading edge photovoltaic cells
are highly inefficient at such low radiation levels, but by laws of probability
such a photovoltaic cell will generate DC electricity.
Therefore, you'll have to ask yourself if the photovoltaic cell breaks the 2nd
law in accordance to your interpretation of such a law. Here's a quote from
Wikipedia,
Quote,
http://en.wikipedia.org/wiki/Brownian_ratchet
---
"This is against the principle of the second law of thermodynamics, which can be
stated as 'It is impossible for any device that operates on a cycle to receive
heat from a single reservoir and produce a net amount of work."'
---
A charged capacitor is a source for usable work and can generate heat.
[snip]
Regards,
Paul Lowrance
