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Author Topic: One-way radiant heat panels  (Read 5691 times)

Offline Jim_Mich

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One-way radiant heat panels
« on: May 17, 2005, 04:46:56 AM »
What if there was a way to make a panel that let radiant heat pass one direction while blocking it in the reverse direction. It would act like a heat diode. Imagine a panel full of lenses. Each lens focuses visible and infared light and passes it through a tiny hole. Any reverse radiant energy is reflected back. This would cause one side of the panel to be warmer while the other side cooler. I've toyed with a number of ideas such as lenses and fiber optics.

There would be many uses for such panels, such as heating and cooling building, coolers to keep food cold or hot, and if coupled to low temperature heat engines with generators might even produce electricity. Might even be able to make self cooling soda and beer cans or self heating soup cans?

Jim_Mich

Free Energy | searching for free energy and discussing free energy

One-way radiant heat panels
« on: May 17, 2005, 04:46:56 AM »

Offline fleebell

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Re: One-way radiant heat panels
« Reply #1 on: May 17, 2005, 06:35:02 AM »
If you think about for a moment there would be alot more applications for something like that... It would probably be a stirling engines designers dream come true among other uses
Lee B

Offline Charlie Brown ARN

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Re: One-way radiant heat panels
« Reply #2 on: May 17, 2005, 12:47:11 PM »
A panel of black material with a lot of conical depressions on its surface may radiate more thermal background than a smooth flat surface because the surface area is greater. It may then overwhelm the flat backside of the next layer in a cascade. A surface with many small conical depressions will have the same surface area as a surface with one large conical depression but the layer with the smaller features will be thinner, allowing a more compact cascade. Electromagnetic radiation can go through pores one tenth its wavelength if there is no gap at its target. Heat conduction in the area outside the conical depression should be avoided because this degrades the desired heat pass forward effect. Maybe insulating posts can be used. A millimeter of cascaded layers will contain a hundred ten micrometer layers or a thousand one micrometer layers, the probable most interesting range of size for 10 micrometer infrared, the infrared peak at room temperature. This effect may be useful at high temperatures because thermal radiation increases with the fourth power of the temperature and the peak wavelength decreases with increased temperature. My estimate is that this is worth trying but probably not practical at room temperature. I was stimulated by your question in this forum so this is a group idea.

Free Energy | searching for free energy and discussing free energy

Re: One-way radiant heat panels
« Reply #2 on: May 17, 2005, 12:47:11 PM »
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Offline kenbo0422

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Re: One-way radiant heat panels
« Reply #3 on: May 17, 2005, 10:59:42 PM »
Glass



Greenhouses use it, although heat can escape.  The key would be frequency attenuation, i.e. infrared passes in one direction, but looking at it from the other direction, the 'color' is different and won't let it back through.   How's that for a half baked idea?

Offline dracozny

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Re: One-way radiant heat panels
« Reply #4 on: May 18, 2005, 06:33:46 AM »
a solar oven would work on similar principles on one side of the panel is reflective surface such as a white color and on the other side is black. some heat will escape but it will still get extrememly hot. just like all you people with black cars :P

Free Energy | searching for free energy and discussing free energy

Re: One-way radiant heat panels
« Reply #4 on: May 18, 2005, 06:33:46 AM »
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Offline Hope

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Re: One-way radiant heat panels
« Reply #5 on: August 24, 2010, 10:40:55 AM »
Nasa has decided that a heated nitrogen ion stream is the most efficient heat pump design to date.   They use a large  SINGLE grown crystal lens to concentrate the light into heat and vaporize solid nitrogen.  What may be of interest to you is that they FILTER out the HEAT wavelengths to protect the device from overheating.  They use a coating on the input focus lens to reflect the unwanted rays away.  Your idea seems like a possible device,   just make the light focus and enter a chamber that is small then insure that polarized one way coating INSIDE the holding chamber and pointing outward lens doesn't let it bounce back out.

Offline Cherryman

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Re: One-way radiant heat panels
« Reply #6 on: August 24, 2010, 09:27:14 PM »
A see trough mirror. 

One side reflects, the other lets trough...


Free Energy | searching for free energy and discussing free energy

Re: One-way radiant heat panels
« Reply #6 on: August 24, 2010, 09:27:14 PM »
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Offline DreamThinkBuild

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Re: One-way radiant heat panels
« Reply #7 on: August 30, 2010, 12:56:48 AM »
@All,

Evacuated or vacuum solar tubes come close to a heat diode.

This site shows some information on them.
http://www.solarpanelsplus.com/evacuated-tube-collectors/

 

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