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Post by satamax on Feb 18, 2015 23:01:19 GMT -8
Hi everybody.
No time to try out things.
But as there's some interest about cooking lately.
Based on Patamos's idea of using the firebox as oven, i've had a mad one again!
Since Peter said a few times that it is not that important to insulate the firebox of a batch rocket. I wondered what if,
what if i made the sides and bottom out of thick refractory bricks. Still i would insulate around that with air entrained concrete. But on top of that firebox, i would put a cast iron plate, for cooking purposes. And when you want to use it as a oven, put a refractory brick slab over that piece of cast iron. And behind all this you still have the heat riser, barrel etc that you usualy have. If the cast iron plate isn't too "airwashed" this could work. And solve the problem of many builders wanting to cook, heat, have a high enough firebox, no short stubby heat riser etc! That's prety much like russian or klondike gold miners's old tent stove.
As usual, public domain idea!
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Post by Daryl on Feb 19, 2015 2:32:21 GMT -8
I don't know if a cast iron plate is going to create enough heat for an oven. Some possible problems could be the airflow won't be even, not enough heat, and that type of metal tends to retain heat, not a lot but enough.
Others will know better but right off the bat, those are my concerns.
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Post by peterberg on Feb 19, 2015 2:44:10 GMT -8
Max,
As a cooking plate it could work. But an oven... I seriously have my doubts, because only the bottom is heated.
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Post by Vortex on Feb 19, 2015 3:19:41 GMT -8
Max, You could get one of the old fold down insulating covers that they have on top of some ranges like this: www.allenvalleythefireplace.co.uk/s/cc_images/cache_18911659.jpgI believe the reason the firebox doesn't need to be insulated is that in the early part of the burn the firebrick absorbs a lot of heat it later reflects back into the fire aiding combustion. That's definitely the case in my stove. |
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Post by Daryl on Feb 19, 2015 6:23:15 GMT -8
Here's a cool thought...if this oven rocket is outside and you can get temps up around 225...instant smoker. Place the wet woodchips on the cast iron plate and set the meat up above on a rack. You will need less heat for a cold smoker.
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Post by satamax on Feb 19, 2015 8:18:27 GMT -8
My dear ladies and gentlemens. Sorry for the confusion. But there i'm following this donkey32.proboards.com/post/16055/threadWhere the firebox would be an accumulation oven. Let the embers die, stuff the food to bake or roast inside the firebox, close it!  The top cast iron would be left bare to cook on top during the burn. Or if you wanted to use the firebox as an oven later, it would be covered with a refractory slab, to stop somewhat it's heat release into the surounding air. And accumulate more heat. May be several slabs could be used. And even, one could make some with handles. Clearer? |
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Post by satamax on Feb 19, 2015 8:23:58 GMT -8
I believe the reason the firebox doesn't need to be insulated is that in the early part of the burn the firebrick absorbs a lot of heat it later reflects back into the fire aiding combustion. That's definitely the case in my stove. Vortex, i know this. My green machine gets to the point where the firebricks are glowing bright orange, and to a lesser extent the range retrofit does too. To me refractories are not insulators per se. But, they slow down the travel of the heat to the other side soo much that they still insulate, and they accumulate the heat. At least for dense refractories. |
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Post by ronyon on Feb 19, 2015 9:58:44 GMT -8
My old Chambers oven uses a thick cast iron plate at the bottom.The oven is heavily insulated,designed to cook off of accumulated last, with the gas off.
When I bake, I put my last batch in, close the door, and go to church for a couple hours. The oven is still hot and the bread is perfect.
As a griddle or stove top the cast iron should be very nice.
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Post by DCish on Feb 20, 2015 13:12:10 GMT -8
If the cast iron plate isn't too "airwashed" this could work. And solve the problem of many builders wanting to cook, heat, have a high enough firebox, no short stubby heat riser etc! I really like the options that this idea opens up! In the build I am hoping to do I want at least a bit of "quick heat" available, whether for cooking, using as an evaporator to humidify winter's dry air, or just to serve the "instant heat" function that the barrel serves in some designs. Thanks for the share! |
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Post by satamax on Feb 21, 2015 4:03:17 GMT -8
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Post by peterberg on Feb 21, 2015 4:55:52 GMT -8
OK, this is clear. Whether the cooking plate will heat up quickly enough remains to be seen. It will get hot though, but the flames aren't directed to the plate but to the port instead.
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Post by satamax on Feb 21, 2015 6:08:33 GMT -8
Looking at how hot th door of the range retrofit gets, i'm not too worried! |
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Post by johndepew on Mar 28, 2015 18:37:45 GMT -8
Has anyone had time to fiddle with this idea? For my second rocket stove, I was planning a cooktop over the riser, and a J-tube system. However, if this idea works, it would be really cool to use the cooktop as the ceiling of the firebox, with the rest of the firebox being used as an accumulation oven, and route the riser exhaust straight to bells or out the bypass and up the chimney for summertime use/cold start. I might fiddle with it this summer after a couple other projects get completed.
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Post by satamax on Mar 28, 2015 23:44:38 GMT -8
I haven't.
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Post by matthewwalker on Mar 29, 2015 6:41:30 GMT -8
I have glass for the top plate of my batch box and I have been cooking over it daily all winter. I think it's a good location for a cook top.
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