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Post by fiedia on Nov 17, 2022 11:00:39 GMT -8
There is another way: how many m3 of gas do you burn per year? How many days do you heat per year?
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jonasp
Junior Member
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Post by jonasp on Nov 18, 2022 3:56:36 GMT -8
There is another way: how many m3 of gas do you burn per year? How many days do you heat per year? 1350 m3 for a year. i would say roughly 5-6 months. How would i calculate this number into kW needed for stove? I've also have some more information about the chimney will take some photo's later on. (there's a clay chimney pipe inside the masonry) |
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Post by fiedia on Nov 18, 2022 6:41:46 GMT -8
1350 m3 gas x 11 kWh/m3 = 14850 kWh 14850 kWh / 5 kWh/kg = 2970 kg wood 2970 kg / 180 days = 16.5 kg wood/day
looks like 180mm is the right choice (10 kg per batch). one burn a day during the milder winter period, 2 burns a day when it gets cold.
Are you sure that the 1350 m3 are for heating exclusively? No water heating and no cooking?
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jonasp
Junior Member
Posts: 102
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Post by jonasp on Nov 20, 2022 0:46:57 GMT -8
1350 m3 gas x 11 kWh/m3 = 14850 kWh 14850 kWh / 5 kWh/kg = 2970 kg wood 2970 kg / 180 days = 16.5 kg wood/day
looks like 180mm is the right choice (10 kg per batch). one burn a day during the milder winter period, 2 burns a day when it gets cold.
Are you sure that the 1350 m3 are for heating exclusively? No water heating and no cooking?
Awesome thanks for doing the calculations for me! I'm a 100% sure. It might be a bit less this winter since I insulated some extra parts halfway through previous winter and I only have 1 year of reference. What I'm also sure is that the warm water being warmed up by the boiler is not optimally used in the 2 circuit system... There'll also be further insulations improvements in the future (glass bricks replaced by glass, better glass in some places, thicker wall insulation, some area's in the roof I couldn't get to for better insulation, etc), so at the end a 150 system might be sufficient. |
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jonasp
Junior Member
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Post by jonasp on Nov 20, 2022 1:34:50 GMT -8
Here are some pictures to show the current state of the chimney. Clay liney, inside expaded clay bricks. The 2 holes on each side are empty spaces running all the way to the top. The whole structure is in the middle of the house besides the top 1meter (see second pictures)   Would I actually need a stainless steel pipe inside the clay liner? Do I fill those empty spaces with some insulation? |
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Post by fiedia on Nov 20, 2022 11:13:31 GMT -8
I would scale it 180mm. Unless you have a very well insulated house, 150mm for 80m2 sounds small.
I use stainless steel for the inner tube. High temperature + condensates = rust.
I would try to put 180mm tube inside your flue and fill it with perlite. It won't be easy. May be you have to make some holes along the flue to fill the space. Thermal cycles will stack the perlite downward. You will have to refill from the top after some time.
Make sure that the condensates run down inside your pipe (be careful during tube assembly). the flue should go straight into your stove. Pipe bends can bring some dark stinking condensate dripping underneath.
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Post by Vortex on Nov 20, 2022 13:45:10 GMT -8
I thought it was a round clay liner like they use here. That wouldn't be so bad with a 180mm stainless liner filled around with perlite, as you'd only have 4 narrow strips that would only have 10mm of insulation, the rest would have more so it should even out. I dont think it's worth filling those side holes in the concrete, wouldn't help much.
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jonasp
Junior Member
Posts: 102
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Post by jonasp on Nov 20, 2022 23:28:10 GMT -8
I would scale it 180mm. Unless you have a very well insulated house, 150mm for 80m2 sounds small.
I use stainless steel for the inner tube. High temperature + condensates = rust.
I would try to put 180mm tube inside your flue and fill it with perlite. It won't be easy. May be you have to make some holes along the flue to fill the space. Thermal cycles will stack the perlite downward. You will have to refill from the top after some time.
Make sure that the condensates run down inside your pipe (be careful during tube assembly). the flue should go straight into your stove. Pipe bends can bring some dark stinking condensate dripping underneath.
Ok thanks for all the information! There'll be a really small bend probably only 15degrees. Good advice on refilling after a while, I will keep that in mind! |
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jonasp
Junior Member
Posts: 102
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Post by jonasp on Nov 20, 2022 23:30:11 GMT -8
I thought it was a round clay liner like they use here. That wouldn't be so bad with a 180mm stainless liner filled around with perlite, as you'd only have 4 narrow strips that would only have 10mm of insulation, the rest would have more so it should even out. I dont think it's worth filling those side holes in the concrete, wouldn't help much. Oh I should've been more clear! Anyhow thanks for the advice I'll go ahead with the stainless liner and perlite and just close those side holes at the top. Can't wait to start on my dsr 2 built, all the plans are being finalized. |
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Post by fiedia on Nov 21, 2022 0:59:43 GMT -8
make sure that no water gets inside the perlite otherwise the insulation will be very bad. There are steel junctions you can put between the pipe and the masonry top.
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Post by woodrascal on Nov 24, 2022 4:37:21 GMT -8
My own practical experience of using a batch rocket in our home-
We live in an old stone house. The BB rocket heats our water system and a brick bell. The exhaust is routed through the existing simple brick chimney (inside the house).
If the BB rocket hasn't been used for a few days, I light a small pre-heating fire at the base, to warm and prime the chimney.
During normal operation, in 5 years we have experienced no problems using this uninsulated chimney flue on the BB system.
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jonasp
Junior Member
Posts: 102
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Post by jonasp on Nov 24, 2022 23:29:02 GMT -8
My own practical experience of using a batch rocket in our home- We live in an old stone house. The BB rocket heats our water system and a brick bell. The exhaust is routed through the existing simple brick chimney (inside the house). If the BB rocket hasn't been used for a few days, I light a small pre-heating fire at the base, to warm and prime the chimney. During normal operation, in 5 years we have experienced no problems using this uninsulated chimney flue on the BB system. Thanks for the reassurance! I'm confident the 180mm uninsulated with perlite will work fine. |
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