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This unit is known as a Kuznetsov boiler.
It is based on a design solution provided by Igor Kuznetsov, designed in accordance with the System of Free Gas Movement.
Igor provided the basic design, and Alex finalized all details and created complete drawings.
This system is well known and has been used successfully in numerous boilers built by Igor's team through the years.
See Igor's boiler article http://www.stove.ru/index.php?lng=1&rs=109
This masonry hydronic heating core will receive a 4' clay brick facing, and then be insulated on the outside with 4'
of Roxul insulation.
Igor Kuznetsov's comments on this boiler.
Comparison: Tarm boiler installation
Conversation with John McDougall:
In a phone conversation, John reported that he had been using the boiler for 2 weeks.
Overall, he thinks it is working well for heating the shop, so far. During below 0F weather,
the shop stays around 50F, with one fire per day.
If the firebox is reloaded, the temperature pressure relief valve actuates, because the
system cannot dump heat into the slab fast enough. Normally, a boiler installation
of this type would have a water storage tank, to soak up spikes in the heat output from the
coil. He reports a 40 degree temperature differential between outlet and inlet, when 30
degrees is normal for standard hydronic layouts.
With a standard PEX floor tubing layout running at 30 lbs pressure, a more consistent heat
source has been assumed. If one wanted to get by without a
storage tank, the PEX layout could be redesigned. More loops could be run in parallel, to
reduce the system friction, to allow a higher flow rate at 30 psi. If enough temperature drop
can't be attained in the return, then additional tubing can be added to the slab design, to
provide more heat exchange capacity.
In a domestic system, a storage tank would be specified, because the temperature regulation
needs to be more controllable. In a shop system such as this, using the slab alone for storage
still remains an interesting possibility.
In experiments with hydronic heating with contraflow heaters, Mark Klein at Gimme Shelter Construction
in Wisconsin reports that using slabs alone has worked well, because the hot water output
is less than in a dedicated boiler such as this.
Hot water experiment report from William Davenport
Mar 26/09
Comments from John McDougall in reply to IgorKuznetsov
Thu, 26 Mar 2009 15:51:20 0500
----- Original Message -----
From: ' ' <igor(at)stove.ru>
To: 'John McDougall' <jmc(at)ripnet.com>
Sent: Sunday, March 01, 2009 12:14 AM
Subject: boiler
How does the boiler work?
--- Take a look atthe attached photos. My intention was to have a very low-tech systemthat took little or no power to operate. I have been running onecirculating pump for all six loops and believe that this is simply notenough. When the circulating pump is turned off, there doesn't appearto be any circulation at all, as the temperature at the boiler climbsrapidly. I have a mixing valve to maintain the temperature of the heatexchanger, so as to minimise condesation. So far I've not been able toadjust this satisfactorally.
What do you like and not like? What lacks do you see in the boiler works?
What wishes you have for work improvement of the boiler and water heating system?
Did you try to operate the boiler without the pump (for this purpose bypass is necessary)?
What is the heated area?
--- The floor area of the shop is 35 feet x 45 feet. The concrete slab is approximately 5.5 inches thick.
What is the power capacity of the boiler approximately?
--- I typically fire the boiler once in the morning and once in theevening, if I have time. My original hope was to be in the shop most ofthis winter, thereby being able to monitor the system. So far, thatplan has not worked out. With this amount of fuelling, I'm able tomaintain a slab temperature of of 60-65 degrees Fahrenheit, which isvery comfortable for a shop / working environment. At this temperature,I am seeing moisture/condensation at the bottom of the bell chamber.
Did you carry out the average amount of fired wood per day?
--- Because I did not start the boiler initially until after Christmas,I've had to play catch-up. The slab was quite cold by this time.
How many electrical energy you spent for heating this area earlier?
---My shop has a office space with a bathroom and water source underneathit. Prior to boiler start-up, I just heated this area with electricityso as to keep the pipes from freezing.
Is the boiler isolated?
---The boiler is not isolated. It is in the open area of the shop. It isalso not insulated, therefore, it radiates a fair amount of heat.
If it is not isolated, what temperature is the surface of the boiler while stoking?
- -- If I double-fire the boiler, I can get exterior temperatures of 160 degrees Fahrenheit.
What temperature has the inlet and the outlet water?
--- As previously mentioned, the return from the floor has levelled outat approximately 65 degrees Fahrenheit. When the boiler is being fired,the temperature at the outlet usually runs around 140 degreesFahrenheit.
Does the boiler works visually dirty or not?
--- There is a bit of smoke at the front end of the burn, but otherwise it is very clean.
My overall impression is the boiler itself works very well at heatingthe water, but I haven't been able to figure out the circulation systemproperly.
I am currently experiencing pressure drops during the burn, which I hope is not because of leaks in the floor tubing.
However, because of my schedule, I have not been able to devote the time to figuring this all out.
Thanks for your input,
--- John
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