In reply to Jones Beene's message of Tue, 29 Jan 2013 11:14:17 -0800:
Hi Jones,
[snip]
In the end - if you want to find a practical and gainful heat-to-electricity
device close to ambient, then provide the virtual sink well below ambient.
That may be difficult, but Dirac permits it and I
Ok, I think there is something that David and I myself are unclear on...
Let's say you take IR radiation, so what is that?
A high frequency EM wave in the Teraherz range, if you have a nano antenna
and diodes suited it could maybe be rectified directly to usable power,
since this can be done
In reply to John Berry's message of Tue, 5 Feb 2013 11:12:21 +1300:
Hi John,
Ok, I think there is something that David and I myself are unclear on...
Let's say you take IR radiation, so what is that?
A high frequency EM wave in the Teraherz range, if you have a nano antenna
and diodes suited
I like to use thought experiments to answer questions if possible since many
times that can show the direction that processes take. It is a known fact that
if you take a red hot ball of iron and place it into deep empty space that the
heat will slowly radiate away in the form of black body
So what is wrong with the Wikipedia article?
What I mean is that regardless of how efficient the thermophotovoltaic is
there is no other way for heat-energy to escape the enclosure except as
IR-light converted to electricity. With this forced arrangement how can
electricity generation be anything
From: David Jonsson
What I mean is that regardless of how efficient the
thermophotovoltaic is there is no other way for heat-energy to escape the
enclosure except as IR-light converted to electricity.
That is naïve. IR light will escape - whether some small
Jones, are you saying in simple terms that any thermophotovoltaic device
immersed within a constant temperature environment saturated by infrared
radiation will not produce electrical power? Does this imply that there must
be a sink of some sort that is of lower temperature for these to
I read the article and it definitely states that the electricity is generated
by a temperature differential. If you immerse the cell within a constant
temperature environment, it appears as if you can not get any electrical
energy. This is consistent with what I have seen in the past where
From: David Roberson
Jones, are you saying in simple terms that any thermophotovoltaic device
immersed within a constant temperature environment saturated by infrared
radiation will not produce electrical power? Does this imply that there must
be a sink of some sort that is of lower
David,
You are possibly misreading this article. It is poorly written to begin with.
Carnot efficiency affects all heat engines in a similar way.
Moreover, it is a basic limitation which deducts “off the top” so all other
inefficiencies deduct from the lower number.
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