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  #451  
Old 07-27-2013, 09:28 AM
deejayoh's Avatar
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Default Re: new build in werribee

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Originally Posted by david s View Post
That's good to hear. I think some stainless in this area is a good solution, but my point was that it needs to be thin. If yours is only 2% of the mass of the same volume of firebrick then yours must be extremely thin. Looking at Colin's photo the section appears to be a 2" x1" (25x50 mm with a wall thickness of around 2.0mm) which weighs just over 2 kgs/m. The same volume of dense firebrick weighs 9.5 Kgs. So you have around 20% of the mass not 2%. Really the only stainless bit you need is the bit on top and a little down the sides. Reducing the amount of stainless exposed to the bricks on the sides and the bottom would be preferable. With a wall thickness of 0.5 mm and say40% of the section cut away, the mass could be reduced to an eighth of what you presently have. Another job for the angle grinder perhaps?
you can only count the mass at the top and bottom. The way to calculate the heat transfer is as the mass of the top and bottom of the tube passing through two planes of metal. But you are really stirring up a tempest in a teapot on this one. A heat break doesn't affect the performance of the oven while firing, it is only about retention after firing. And after firing, heat loss through the floor is not really a big issue. The dome has greater mass than the floor and heat rises. The places to focus on heat retention are the door and the arch heat break
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  #452  
Old 07-27-2013, 02:26 PM
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Default Re: new build in werribee

Quote:
Originally Posted by deejayoh View Post
you can only count the mass at the top and bottom. The way to calculate the heat transfer is as the mass of the top and bottom of the tube passing through two planes of metal. But you are really stirring up a tempest in a teapot on this one. A heat break doesn't affect the performance of the oven while firing, it is only about retention after firing. And after firing, heat loss through the floor is not really a big issue. The dome has greater mass than the floor and heat rises. The places to focus on heat retention are the door and the arch heat break
I'm not trying to stir a tempest, just trying to give evidence why it's important to use as little density of stainless as possible because it's way denser and conductive than brick. If you are trying to create a heat break then stay away from heavy, dense and highly conductive material. If you must use it then make it as thin as you can. In your case because you have used an extremely thin tube (2% of the same volume of brick) you'll be ok. I actually miscalculated, a 2" x 1" (25 x 50mm) x 2mm thick stainless tube at 2.1 kgs/m, is only 46% of the mass of the same volume of solid brick (4.6 kgs) and 10x more conductive.
Heat moving by conduction will travel downwards very easily especially if a more conductive material is beneath it. It is the very reason that insulation under the floor is important. Heat rises in air because it expands the air, making it less dense than the surrounding air, like a bubble rising in water.It's different when heating a solid.

Last edited by david s; 07-30-2013 at 04:27 AM. Reason: Correction
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  #453  
Old 07-31-2013, 01:20 AM
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Default Re: new build in werribee

Work last weekend part 1 photos
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new build in werribee-imag0865.jpg  
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  #454  
Old 07-31-2013, 01:26 AM
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Default Re: new build in werribee

Part 2 photos.

Woops didn't take any photos of next course 9, 2/3 completed. Will do so tomorrow, before picking up my granite landing.

Stay tuned for Part 3
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new build in werribee-imag0867.jpg   new build in werribee-imag0866.jpg   new build in werribee-imag0868.jpg   new build in werribee-imag0869.jpg   new build in werribee-imag0870.jpg  

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Last edited by oasiscdm; 07-31-2013 at 01:54 AM.
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  #455  
Old 07-31-2013, 06:02 AM
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Default Re: new build in werribee

Nice brick work Colin. Just about there.
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  #456  
Old 07-31-2013, 06:20 AM
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Default Re: new build in werribee

Ta Russell

Now too see how I go widening the bricks to span 2 bricks on bond and keep the tight internal brick to brick fit. Once course 9 is completed that is.

Finally worked out your chimney mount, I kept seeing it all wrong, you bolted the plate to the vent structure not the capping bricks. Derrrrrrrrrrrr
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Last edited by oasiscdm; 07-31-2013 at 06:26 AM.
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  #457  
Old 07-31-2013, 08:18 AM
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Default Re: new build in werribee

Ya, my pics are confusing, the view is actually looking upside down, just wanted to show the inset cuts of the anchor plate.
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  #458  
Old 08-01-2013, 12:41 AM
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Default Re: new build in werribee

well was ill but got something done. Picked up landing, positioned. Cut some splits for course 10 and to lift the landing to the right height [one brick, one cut two purposes].

Made some alterations to my dome template for the last couple of courses.

Part 1 Photos below.
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new build in werribee-imag0873.jpg   new build in werribee-imag0874.jpg   new build in werribee-imag0876.jpg   new build in werribee-imag0878.jpg   new build in werribee-imag0877.jpg  

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Last edited by oasiscdm; 08-01-2013 at 01:08 AM.
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  #459  
Old 08-01-2013, 12:55 AM
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Default Re: new build in werribee

Part 2 photos

Not far away now from closing maybe this weekend [have 3 days off ] will get to last 2 courses at least, hopefully landing cemented in place, maybe a little further. Who knows, fingers crossed no holdups.
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new build in werribee-imag0878.jpg   new build in werribee-imag0879.jpg   new build in werribee-imag0880.jpg   new build in werribee-imag0881.jpg  
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Last edited by oasiscdm; 08-01-2013 at 01:29 AM.
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  #460  
Old 08-01-2013, 02:31 AM
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Default Re: new build in werribee

Looking good Colin.............. I really like your oven landing.
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