Insulated panels to absorb and retain IR heat
Insulated panels to absorb and retain IR heat
(OP)
Insulated panels to absorb and retain IR heat
I am and electrical guy but I have been involved in an insulation project for a few weeks and I have got to come up with an idea about that.
The point is that I would like to build a black flat panel made by a material with a high thermal capacity (i.e. that can retain solar IR heat as much as possible).
The trick here would be to cover this flat panel with a sheet of plexiglass on standoffs. If I make the standoffs around 1/4" and seal the plexiglass, I'll mimic a double pane window and snuff the convective heat transfer.
------------------------------- PLEXIGLASS
AIR
------------------------------- PLEXIGLASS
AIR
############################### BLACK MATERIAL
The plexiglass will allow sunlight in, but will not transmit the radiated LWIR. If the inside box surface is blackened, that'll maximize the sunlight absorption.
The heat should be retained as much as possible into the inner black panel to be slowly released to the inside during the night.
What kind of black coated material would do the job best?
Hope I have been clear, sorry but I am quite new to insulation materials. Any help appreciated.
I am and electrical guy but I have been involved in an insulation project for a few weeks and I have got to come up with an idea about that.
The point is that I would like to build a black flat panel made by a material with a high thermal capacity (i.e. that can retain solar IR heat as much as possible).
The trick here would be to cover this flat panel with a sheet of plexiglass on standoffs. If I make the standoffs around 1/4" and seal the plexiglass, I'll mimic a double pane window and snuff the convective heat transfer.
------------------------------- PLEXIGLASS
AIR
------------------------------- PLEXIGLASS
AIR
############################### BLACK MATERIAL
The plexiglass will allow sunlight in, but will not transmit the radiated LWIR. If the inside box surface is blackened, that'll maximize the sunlight absorption.
The heat should be retained as much as possible into the inner black panel to be slowly released to the inside during the night.
What kind of black coated material would do the job best?
Hope I have been clear, sorry but I am quite new to insulation materials. Any help appreciated.





RE: Insulated panels to absorb and retain IR heat
I assume this is for a house? I don't think you will find a material that can store enough heat energy to release slowly the whole night.
Adriaan.
I am an Engineer/part time student (Mechatronics) from South Africa.
Advice from lecturer: "Be warned - when you go into industry your boss will give you a thousand things to do and he wants them done yesterday!" So far he is right...
RE: Insulated panels to absorb and retain IR heat
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RE: Insulated panels to absorb and retain IR heat
I think this has been done on rooftop energy collectors.
RE: Insulated panels to absorb and retain IR heat
What I had in mind is not just insulation or thermal solar collectors.
The idea is to couple insulation with a heat pump (i.e. space heating).
During the day we could heat a loft using the hot air in the heating chamber between the glass and the roof surface.
The hot air will go up the sloping roof creating a high pressure point, a small air pump powered by a PV solar module will force the hot air down a duct which will convey the air into the indoor loft space.
RE: Insulated panels to absorb and retain IR heat
http://www.nationwidecoatings.com/prod10.htm
RE: Insulated panels to absorb and retain IR heat
RE: Insulated panels to absorb and retain IR heat
Maybe you could get foam insulation panels (or whatever they were) but with a black cover instead of foil.
RE: Insulated panels to absorb and retain IR heat
You can have the black carbon impinged into the copper. Use a small size particle, say around 1 micron or smaller for better surface area to capture the IR energy.