Newbee question: Clearances

[jeff]

I am potentially constrained with a clearance problem. The location where I can place a stove is next to a water tank, which is simply pieces of sheet metal fastened together with a pond liner keeping the water in. I am looking for a way to create enough of a heat shield out of firebrick to prevent the sheet metal from melting he pond liner. Attached is my current prototype stacked up.

I've read from another forum Ernie stating that a grease can will get ~ 500-700F in his tests. Question then is how much of a heat shield is necessary to protect the sheet metal from those temps? I doubt the liner can handle much over 140F if that.

Attached is a photo with the barrel sitting on the riser pipe. Sorry in advance for the images not displaying right side up.

[canyon]

That is looking way close at least from the picture. I would look at getting more clearance. Multiple heat shields with gaps and plenty of room for airflow in at the bottom and open at the top would work best. Even fire brick is too much mass. You need to break the radiated heat from the barrel and convect it out of there with the multiple low mass (thin steel)heat shields. Just a couple of pennies worth.

[jeff]

I figured it was. I can maybe move it bit more, but not much. So I wonder if it added brick on the other side of the tank where by there would be on course of brick on the outside, the sheet metal and another course of brick. I could also mitigate with a fan to move air between open space between the brick and barrel.

[jeff]

Here is another view.

[josephcrawley]

If this is for a greenhouse it seems you would rather have a slow higher mass heating than a faster radiant heating. If thats the case ditch the barrel and build a brick chamber instead. Mine never gets over 300 degrees.

[jeff]

Thanks for the input. Yes, this is a green house. I saw the design by Lars? and thought of this last night. How many courses do you have for the outside wall, just one? Do you have a pic perhaps to help my brain 'see' it?

[jeff]

I've rebuilt using an all brick mock up. With the course of bricks on the stove, a 4" space between another course against the pond, seems more likely this may work. Don't know.... We'll see

[canyon]

I think you might do better skipping the bricks against the pond. Again, multiple layers of steel heat shield (cut sections of barrel?) with air gap for quickly getting rid of heat by converting from radiant to hot air convective. The firebrick heat riser outer layer is a big improvement.

[jeff]

A friend of mine mentioned a fire blanket may work.