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Pre-Order for The Truly Passive Greenhouse Movie
truly passive greenhouse movie


About the Truly Passive Greenhouse

The Truly Passive Greenhouse

The problem: All greenhouses in a cold climate need heat.  So they consume energy and require human discipline.  At the same time, it is possible that on a sunny day, a greenhouse can get hot enough to kill everything inside.  

The solution: We have a plan to create a greenhouse that requires no heat, and will never overheat.  Mostly, we will use the heat from the summer to heat the structure through the winter.  And if we have a moment of excess heat we will passively store it and save it for later - with no harm to the plants, all with no need for human discipline.

The Greenhouse is Built, and the Movie is in Production!

wofati greenhouse
front view of the greenhouse
view from above of wofati greenhouse
aerial view of the greenhouse


You can read more about the construction, and see lots more pictures in this thread: The First Wofati Greenhouse Design


$15.00

Wofati Greenhouse: experimenting with truly passive heating - movie pre-order
  • This is for a PRE-order of The Truly Passive Greenhouse movie
Seller paul wheaton
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That excerpt is awesome! I am so glad I backed this project.
 
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Yeah pretty dope.
 
Jim Misencik
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This came at the perfect time, getting ready to design a greenhouse for my market garden next year - can't STAND the polytunnel plastic structures. Was already thinking a sink it ~3 feet into the ground but those little ideas in the vid got my brain working.
 
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Ditto!
 
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Fanf.....g[Tastic excerpt!!!
 
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👏👏👏👏👏👏
This is such an educational video. Everything is is explained. I'm proud to have been part of the kickstart.
 
master steward
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Bee Harris posted these pictures in his Bootcamp thread

Bee Haris wrote:

The reflective tubes Grey and I fabricated


Grey installing the reflective tubes in the greenhouse


passive heating and cooling tubes in greenhouse
Project complete. Now we see if this will work!


A view from the outside, after our tubes were installed




And check out this epic cob sunflower on the greenhouse that Magdalene made!

cob natural plaster sunflower

And the snowflake that Grey woodburnt!

woodburned snowflake

 
steward
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the west well, with the 1 inch destratification pipe (2.2 degrees improvement), is performing better than the east well with the 1.5 inch destratification pipe (1.7 degrees improvement).  

I think it is acceptable to say that the 1 inch destratification pipe wins this test.
 
pollinator
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To test whether the pipes are what's driving the temperature change, cap the pipes. If the temperature trend continues unabated, then the pipes aren't responsible.
 
paul wheaton
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When the pipes were not there:   weeks of a rock solid steady 46.2 degrees.  

And then we added the pipes:  no change.

And then we added the reflectors:  now we see change.

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