Rear loaded heating boiler

[banung]

I was thinking only within the given limits.
I understand 6kg of wood max.

[banung]

Here is what i have drawn with the local available materials. Combustion part only.

Note. At the back will be the rear loading insulated door. In the front the glass door.

Firebox: 3cm thick 1700C Fireclay brick. Dimension as it should be, only  longer depth (50cm). Insutaled with 5mm 1200C Fiberfrax Duraboard.

Riser: 2,5 cm thick 1700C Fireclay round brick, insulated with 3cm 1200C wool. 102 cm high.

All glued together with fire mortar and waterglass. (I must try it, I need to join somehow firebox and riser in the stove)

Seconddary air, I downloaded channel2 V8. Difference is only longer path, otherwise the path of air would be too short. ( I don´t use the sollution I mentioned earlyier)

The biggest difference is in the primary air. It is 2 cm x 22 cm chanel, exitting on the firebox floor, behind the glass door. It will cool the glass door. Air will be little bit warmed from the bottom of the stove.

The primary air imput area will be reduced by sliding door.

Hopefully is clear enough.

If someone see some any problem or have some suggestion, please let me know.

Thanks

The pictures are nor visible here. I don´t know why. So here are the links:

Firebox and Secondary air

[peterberg]

Hi Banung,
As I see it, the floor channel is way too long. The air will be heated up too much (yes, it's possible!) and the three 90 degree corners pose too much friction.
One of the two: I'd suggest you do it the way I designed it in my personal batchrocket heater with the secondary air inlet behind the main inlet OR take the shortest route to the back.

Your pictures won't show because the site where the pictures are is http: instead of https:

[banung]

Dear Peter,

I redraw the air path. It is good, that it can be changed easily.

I made some material and work cost calculation. To build heat exchanger is not cheap. I´m forced to reduce heat exchanger area, to keep costs lower and the project senseful. Therefore I´am moving to smaller system 120 or even 100 mm riser diameter. For our well insulated house and solar water heating it will be still enough.

My question is, were there any testing of this smaller systems made? Regarding to proper combustion proces, effectivity or emmissions?

Another thing I´m worried to ask is the dimensions of the box. 100 mm system has too small front door (area to watch the fire, we like it). Too small for larger piece of wood. There are no so small and nice front door on the market.

I understand I can load only as much wood depending on the system size. Is the dimension of the box so critical? Port would be the same …
Right now I have drawn 100mm system with about 120 mm size of the box. Exchanger area cca 1,5m2. In therm of costs, it makes sense for me now. What do you think is better sollution, or less worse

1) 120mm system, with about 800 mm high riser and have heat loss. (Heat exchanger will be not able to process all the heat) or

2) 100 mm system with larger box.

There will be heat loss in both cases, but still better than in standard stoves with heat exchanger ...

Thanks wery much