The Walpini: Underground, Year-round Greenhouse

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The Walpini: Underground, Year-round Greenhouse

Post by rsnurkle » Mon Aug 05, 2013 3:49 pm

Made a super quick search, so apologies if there is a duplicate, but this showed up in my social network feeds recently: ... round.html" onclick=";return false;

Obviously, they're trying to sell something, but taking a good look at the principles used might be helpful for utilizing passive solar energy in similar projects. Plus, they built something underground, and preppers eat that up ;).
Growers in colder climates often utilize various approaches to extend the growing season or to give their crops a boost, whether it's coldframes, hoop houses or greenhouses.

Greenhouses are usually glazed structures, but are typically expensive to construct and heat throughout the winter. A much more affordable and effective alternative to glass greenhouses is the walipini (an Aymara Indian word for a "place of warmth"), also known as an underground or pit greenhouse. First developed over 20 years ago for the cold mountainous regions of South America, this method allows growers to maintain a productive garden year-round, even in the coldest of climates.

Here's a video tour of a walipini that even incorporates a bit of interior space for goats:

How a Walipini works and how to build one

© Benson Institute
It's a pretty intriguing set-up that combines the principles of passive solar heating with earth-sheltered building. But how to make one?From American sustainable agriculture non-profit Benson Institute comes this enlightening manual on how a walipini works, and how to build it:
The Walipini utilizes nature’s resources to provide a warm, stable, well-lit environment for year-round vegetable production. Locating the growing area 6’- 8’ underground and capturing and storing daytime solar radiation are the most important principles in building a successful Walipini.

The Walipini, in simplest terms, is a rectangular hole in the ground 6 ‛ to 8’ deep covered by plastic sheeting. The longest area of the rectangle faces the winter sun -- to the north in the Southern Hemisphere and to the south in the Northern Hemisphere. A thick wall of rammed earth at the back of the building and a much lower wall at the front provide the needed angle for the plastic sheet roof. This roof seals the hole, provides an insulating airspace between the two layers of plastic (a sheet on the top and another on the bottom of the roof/poles) and allows the sun's rays to penetrate creating a warm, stable environment for plant growth.

This earth-sheltered greenhouse taps into the thermal mass of the earth, so that much less energy is needed to heat up the walipini's interior than an aboveground greenhouse. Of course, there are precautions to take in waterproofing, drainage and ventilating the walipini, while aligning it properly to the sun -- which the manual covers in detail.

Best of all, according to the Benson Institute, their 20-foot by 74-foot walipni field model out in La Paz cost around $250 to $300 only, thanks to the use of free labour provided by owners and neighbours, and the use of cheaper materials like plastic ultraviolet (UV) protective sheeting and PVC piping.

Cheap but effective, the underground greenhouse is a great way for growers to produce food year-round in colder climates. More over at the Benson Institute and the Pure Energy Systems Wiki.

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Re: The Walpini: Underground, Year-round Greenhouse

Post by desert fox » Thu Aug 08, 2013 5:35 pm

So totally going to do that! With a fish pond inside :)
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Re: The Walpini: Underground, Year-round Greenhouse

Post by buck85 » Wed Aug 14, 2013 11:19 am

Way cool!!!!!Lots to think about!!!!
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Re: The Walpini: Underground, Year-round Greenhouse

Post by Halfapint » Wed Aug 14, 2013 5:07 pm

Very cool, seems easy enough I just wish I had land to try it out on. Would love to have some veggies year round in my own sheltered underground grow house! haha
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Re: The Walpini: Underground, Year-round Greenhouse

Post by Tater Raider » Thu Aug 15, 2013 11:27 am

The 39° angle should be set to match your latitude, so if you live at 45°N or S it should be a 45° roof. This will maximize solar exposure (or so I've been taught).

You'd also want to make sure you dig to well below the frost line so the earth can help the temps stay up.

I'm interested though. Very interested.

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