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mattie

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Reply with quote  #21 
Hello petset77
Great to hear we could help others.Project sounding great, well done on the digging its fairly labor intensive for sure.

Is this the link on Walipini calculations?



One thing that allways niggled me with a rocket stove was ignition and feeding it,allthough an autofeeder may be a possible solution here depending on how well it works of course.I do like the idea of the panels and the IBC's as this will allow minimal input from the user once up and running.You could allways use the rocket stove as back up, which brings down bring down time spent feeding etc.

If you have the time a few photos would be great.Thanks for sharing the info,all the best with the build.
Regards Mattie

pengyou

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Reply with quote  #22 
Good information here!  My neighbors have a swimming pool that has a "plastic bubble blanket" that will automatically cover the pool according to a timer.  Perhaps something like that could be rigged up to cover the glass at night?  I am still not clear in this design about the times when thermal mass is useful and when insulation is useful. 
mattie

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Reply with quote  #23 
Hello  Pengyou
Thermal mass(water in barrels) or its other forms is useful in keeping much of the solar energy that passes thru the glazing inside the Walipini or indeed any structure.

The insulation is there to slow down the rate at which energy is lost, either to the outside air or in the case of the walipini the surrounding subsoil.Another cause of heat loss is at night when the outside temperature drops,the flow of heat from hot to cold is usually greatest during this period.

"My neighbors have a swimming pool that has a "plastic bubble blanket" that will automatically cover the pool according to a timer.  Perhaps something like that could be rigged up to cover the glass at night?"
Sounds like a good plan.
Regards Mattie
pengyou

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Reply with quote  #24 
So would using earthbags to line the insides of the walipini be helpful?  more or less useful than water in barrels? because earthbags can be used on all five sides of the wilipini (including the bottom).  With a solar hot water system it would not be difficult to put piping in/under the earthbags to make a heat mat.  A common idea I have read about in studying this is that the temperature of the roots is more important for the plants survival than the temperature of the plants stem, branches and leaves.
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