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Posted by truckee rider on August 30, 2007, 2:17 pm
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We recently removed an ugly rock-wall from behind our woodstove and
we're thinking of replacing it with metal (trying to "modern" the
place up a bit).
One thought I had was to space the metal sheet out from the wall a
couple inches, from the floor an inch or so, seal the sides and leave
the top open to increase heat/air flow. The thought is that the metal
will heat up, heat the air behind it, that air will rise out of the
top and draw cooler air from the bottom. The intended piece of metal
will be about 5 feet by 5 feet roughly.
I would think this would make our woodstove more efficient/effective
than simply allowing the wall to heat up without the benefits of the
increased air flow.
Any thoughts on this? Any downsides? And is it likely to be more
efficient or simply just distributing the heat differently?
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Posted by Morris Dovey on August 30, 2007, 2:51 pm
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truckee rider wrote:
| We recently removed an ugly rock-wall from behind our woodstove and
| we're thinking of replacing it with metal (trying to "modern" the
| place up a bit).
|
| One thought I had was to space the metal sheet out from the wall a
| couple inches, from the floor an inch or so, seal the sides and
| leave the top open to increase heat/air flow. The thought is that
| the metal will heat up, heat the air behind it, that air will rise
| out of the top and draw cooler air from the bottom. The intended
| piece of metal will be about 5 feet by 5 feet roughly.
Probably a better idea to make the floor gap the same height as the
depth of the gap between panel and wall. Why seal the sides? You'll
want all the airflow that can be managed.
| I would think this would make our woodstove more efficient/effective
| than simply allowing the wall to heat up without the benefits of the
| increased air flow.
Depending on the construction of the new wall and the distance from
the stove, the panel will provide some fire protection. It's unlikely
to affect the efficiency of the stove.
| Any thoughts on this? Any downsides? And is it likely to be more
| efficient or simply just distributing the heat differently?
The space behind the panel will be spider heaven when it's not heating
season - DAMHIKT. If you install the panel, the sides don't need to be
sealed - but if you do, you probably won't want to use anything
combustable...
--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/
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Posted by Trygve Lillefosse on August 30, 2007, 4:25 pm
Please log in for more thread options On Thu, 30 Aug 2007 18:17:18 -0000, truckee rider
>We recently removed an ugly rock-wall from behind our woodstove and
>we're thinking of replacing it with metal (trying to "modern" the
>place up a bit).
>
>One thought I had was to space the metal sheet out from the wall a
>couple inches, from the floor an inch or so, seal the sides and leave
>the top open to increase heat/air flow. The thought is that the metal
>will heat up, heat the air behind it, that air will rise out of the
>top and draw cooler air from the bottom. The intended piece of metal
>will be about 5 feet by 5 feet roughly.
>
>I would think this would make our woodstove more efficient/effective
>than simply allowing the wall to heat up without the benefits of the
>increased air flow.
>
>Any thoughts on this? Any downsides? And is it likely to be more
>efficient or simply just distributing the heat differently?
You will get a more efficient heating of the room, it the sense that
it will heat up quickly. On the other hand, it will also cool down
quicker than with the stone wall.
The stone wall are both for fire protection and to provide thermal
mass, so that it will not be too hot too quick, and so that the heat
will remain for a longer time.
Withouth the stones, you will have to fire up the stove more often
with less wood.
I think it would be even better if you had kept the stone wall, and
added the metal in front of it. Thus it would both be hidden and act
as thermal mass.
A cool item to use when you want the hot air to circulate, is a
stirling fan, that will get the energy to turn from the hot woodstove.
It will turn faster the hotter it is.
http://www.modernoutpost.com/gear/details/te_heat_wave.html (Not the
coolest design on this one, but there are other designs to be found
aswell.)
If your stove is of an old design, it may have an afterburner
installed, to increase its efficiency.
Did not find any pictures. But you basicaly make a couple of holes in
the back of the stove, and install a metal plate over them. This way,
the air that comes in the new holes will be preheated, and
react(oxodize) with the smoke. This create more heat and less
pollution due to cleaner burn.
--
SEE YA !!!
Trygve Lillefosse
AKA - Malawi, The Fisher King
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Posted by on August 30, 2007, 5:52 pm
Please log in for more thread options On Thu, 30 Aug 2007 18:17:18 -0000, truckee rider
>We recently removed an ugly rock-wall from behind our woodstove and
>we're thinking of replacing it with metal (trying to "modern" the
>place up a bit).
>
>One thought I had was to space the metal sheet out from the wall a
>couple inches, from the floor an inch or so, seal the sides and leave
>the top open to increase heat/air flow. The thought is that the metal
>will heat up, heat the air behind it, that air will rise out of the
>top and draw cooler air from the bottom. The intended piece of metal
>will be about 5 feet by 5 feet roughly.
>
>I would think this would make our woodstove more efficient/effective
>than simply allowing the wall to heat up without the benefits of the
>increased air flow.
>
>Any thoughts on this? Any downsides? And is it likely to be more
>efficient or simply just distributing the heat differently?
I had a sheet metal heat shield that I attached to the back of my
barrel stove using bolts and nuts to hold it about an inch from the
stove. The wall in back barely got warm, even when the stove was
going full blast. The only downside was that when I sneezed, the
sheet metal would resonate and make a ringing sound. I rounded the
edges, but a crimper would have made a safer edge to the metal.
I wouldn't consider the thermal mass of the wall you removed
particularly significant, unless it was about a foot thick.
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Posted by Neon John on August 31, 2007, 1:27 am
Please log in for more thread options I'd expect there to be little to no effect either way. The stove will radiate
the
same amount of heat with or without the back metal so efficiency isn't affected
either way. Since keeping YOU warm is more important than heating air, a
reflective
surface that would reflect the infrared back into the room toward you would make
the
best use of the small amount of energy involved.
The back stop is there mainly for fire protection. Metal backed by a
non-combustible
is one of the best configurations and is called for in various codes. In my
restaurant I mounted fire-rated sheet rock on the stud wall behind the grill
line and
mounted 16 ga metal sheet on top of that. It made the fire marshal happy and it
withstood 12+ years of occasional direct flame impingement.
If the wall is flammable, I'd apply the fire-rated sheet rock or concrete
backer-board and then apply the metal directly to it. I used the "screw and
glue"
method, gluing it to the sheet rock with RTV and using sheet rock screws to hold
it
in place until the cement cured.
John
wrote:
>We recently removed an ugly rock-wall from behind our woodstove and
>we're thinking of replacing it with metal (trying to "modern" the
>place up a bit).
>
>One thought I had was to space the metal sheet out from the wall a
>couple inches, from the floor an inch or so, seal the sides and leave
>the top open to increase heat/air flow. The thought is that the metal
>will heat up, heat the air behind it, that air will rise out of the
>top and draw cooler air from the bottom. The intended piece of metal
>will be about 5 feet by 5 feet roughly.
>
>I would think this would make our woodstove more efficient/effective
>than simply allowing the wall to heat up without the benefits of the
>increased air flow.
>
>Any thoughts on this? Any downsides? And is it likely to be more
>efficient or simply just distributing the heat differently?
--
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Tellico Plains, Occupied TN
I'm so cool, I'm afraid to catch a cold.
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