Project coupling solar water heater and wood stove

[yves35]

Good evening,

to have a little more tangible data to feed this post I will order a laser thermometer in order to have temperatures at several levels,

do not confuse temperature and heat (or energy rather) these are two different quantities. It is not for nothing that boilers or wood boilers take the heat around the fireplace and not in the flue. It is theoretically possible to dispense with the aspiration of a flue (to reject combustion gases at room temperature if you ventilate (either by aspirating or by blowing) the fireplace artificially.
This is not done, why ??? probably because there is not much to recover compared to the energy drawn around the fireplace

yves

[GuyGadebois]

It is theoretically possible to dispense with the aspiration of a flue (to reject combustion gases at room temperature if you ventilate (either by aspirating or by blowing) the fireplace artificially.

??

[dede2002]

Good evening,

...
This is not done, why ??? probably because there is not much to recover compared to the energy drawn around the fireplace

yves

About 20%, theoretically, for a stove with 80% efficiency, this is not done because the wood smoke is too dirty, and when cooled it would deposit tar in the duct (bistre).

[GuyGadebois]

Good evening,

...
This is not done, why ??? probably because there is not much to recover compared to the energy drawn around the fireplace

yves

About 20%, theoretically, for a stove with 80% efficiency, this is not done because the wood smoke is too dirty, and when cooled it would deposit tar in the duct (bistre).

We could make a copper coil of the same diameter as the stove outlet that we would adjust to it (therefore at the hottest of the evacuation), with its welded spirals (silver solder) between them to make it waterproof, the section thus produced would replace an existing drainage section and heat the water passing through it. The hedgehog would be responsible for cleaning the object once a year.

[dede2002]

The problem at the start of this subject is the idea of ​​circulating the network water in the coil. It will quickly settle on the inside and it will be unusable. By using water from the solar system via the exchanger, this would be possible, provided that an anti-boiling security is provided ...

[GuyGadebois]

The problem at the start of this subject is the idea of ​​circulating the network water in the coil. It will quickly settle on the inside and it will be unusable. By using water from the solar system via the exchanger, this would be possible, provided that an anti-boiling security is provided ...

An easily removable coil such as a smoke exhaust pipe can be cleaned in no time with water added with citric acid.

[sicetaitsimple]

The problem at the start of this subject is the idea of ​​circulating the network water in the coil. It will quickly settle on the inside and it will be unusable. By using water from the solar system via the exchanger, this would be possible, provided that an anti-boiling security is provided ...

Yes, I also think it would be a good idea. To be seen next depending on the physical characteristics of the installation.

[GuyGadebois]

The problem at the start of this subject is the idea of ​​circulating the network water in the coil. It will quickly settle on the inside and it will be unusable. By using water from the solar system via the exchanger, this would be possible, provided that an anti-boiling security is provided ...

Yes, I also think it would be a good idea. To be seen next depending on the physical characteristics of the installation.

Tartar will settle everywhere, anyway!

[sicetaitsimple]

Tartar will settle everywhere, anyway!

No, you didn't understand.
The idea of ​​Dédé2002 is to use the closed circuit of solar heating to supply the "stove" exchanger. No deposit of scale because closed circuit. If there is deposit, it will be done outside the "solar" exchanger existing in the water heater, but neither more nor less than in the current configuration if the temperatures are properly controlled.

[GuyGadebois]

Tartar will settle everywhere, anyway!

No, you didn't understand.
The idea of ​​Dédé2002 is to use the closed circuit of solar heating to supply the "stove" exchanger. No deposit of scale because closed circuit. If there is deposit, it will be done outside the "solar" exchanger existing in the water heater, but neither more nor less than in the current configuration if the temperatures are properly controlled.

Does he want to "extend" the glycol circuit? The copper coil is still a good plan, it will be like a diver.