Fresnel trombe wall?

Hi everybody!

Well, i'm wondering if ever someone did a fresnel trombe wall, to attain higher temperatures, to store heat for a longer period etc?

Anybody can show me stuff?

Thanks.

Max.

Satamax : I had to stretch my mind a little to find the benefits over no fresnel, and even then I would think that in winter a large reflective pool that bounced
winter sun into the house hitting a massive Trombe wall would actually be more effective than the biggest Freznel lens I would feel safe having in my house.

If Your homeowner had been unable to gather any solar gain for several days, clouds/rain, traveling away, there might be some immediate gain and higher
temps at the surface of the Trombe wall, these higher surface temps would re-radiate to the air raising its temperature. this would be a good thing if the
space was chilled.

Also a fresnel lens might be positioned to bend light onto the Trombe walls surface earlier in the morning, and later in the day then sun incidence angle or
structural layout would otherwise permit .

Short version, I wonder too ! For the good of the Craft ! Big AL

Allen, the idea behind it, is a smaller type of wall. I mean, something like a rocket's mass, heated by a fresnel lens, to a higher temperature. Which would store energy for several days may be.

I should have called that a fresnel mass stove.

That is an awesome question I was just wondering the same thing designing a passive solar heating and cooling system for a greenhouse or home and no it hasn't been done according to all my research I was thinking of using salt or sand for heat absorption I feel like blacksand or crushed asphalt may work the best I feel like if I ran air lines through a wall filled with black sand or crushed asphalt behind a plane of glass with a wall of 2ftx2ft Fresnel lenses just far enough from the wall so that the focal point was just at the sand it would supper heat it even as the focal points moved with the sun and with proper vent design you could either pull cool air into the structure or circulate the hot air within only using the convection current which would be created

Fresnel lenses are fun! And I'm keeping my eyes open for a big one to play with.

They don't offer an energy freebie though. They can concentrate solar energy, but it's exactly the same amount of energy that falls on a simple pane of glass of the same physical dimensions.

Douglas Alpenstock wrote:Fresnel lenses are fun! And I'm keeping my eyes open for a big one to play with.

They don't offer an energy freebie though. They can concentrate solar energy, but it's exactly the same amount of energy that falls on a simple pane of glass of the same physical dimensions.

Douglas, i hadn't thought about this for a while. But i see two advantages now. Fresnel lenses can  increase the size of the window in front of the trombe wall.  

I mean, instead of having a huge low temp wall behind the window, it could help heat a smaller wall at a higher temperature. We're far from reaching the limit of heat storage of a big wall, with a normal window.  And a higher delta of temperature means that the efficiency is better.  Also, redirection of sun rays in the fresnel lens could increase the efficiency. The sun right, up or left of the window would barely heat the wall, with the lens redirecting the rays onto the wall, the system might function better.