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solardan1959

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Reply with quote  #1 
An alternative to the Walipni underground Greenhouse.


But could be used for other greenhouse for temp control.
Dan

mattie

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Reply with quote  #2 
Thanks for sharing Dan,
Interesting this ,seems like its similar in concept to the SHCS system like the one Joek posted.Ive often visited LDS preppers youtube channel its a good spot :Looking forward to watching how this progresses.
Found this too



Regards Mattie
solardan1959

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Reply with quote  #3 
Sorry Mattie,
   I felt he spent to much complaining about that specific version of walipini and the one he used was flawed.  The Pitt house one was designed much better because it had the flat wall with glazing in front which would have add more sunlight.  I am sure many of his points were valid and somebody should take those concerns into consideration when they make their version.  I've always leaned towards the ideal of building a house into the side of a hill with the entire front filled with glass.  This makes it easy to maintain the heat in the house and while mostly underground it can provide a warm stable environment.  The same can be applied with a green house, maybe with a little more glass at the front and top to let more light in.

Dan
mattie

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Reply with quote  #4 

No worries Dan, it was more a manners thanks for sharing.
I posted the link because it may help others get their head around the concept.Watching a lot of these clips for me is about trying to assess the best features of each system.
We will have to watch how the build takes place in order to judge properly,a problem i see with a lot of these systems is the availability of  proper performance data which will prove how well they run.It does mention instrumentation in the first clip, I don't know whether its for real time or logging.
Even the term geothermal is debatable,without sounding pedantic a better term would be ground source. (I would like to state clearly here that none of this is in any way is directed at you,it can be hard to judge context from text so I'm clearing this up right away)

From wiki "Some confusion exists with regard to the terminology of heat pumps and the use of the term "geothermal". "Geothermal" derives from the Greek and means "Earth heat" - which geologists and many laymen understand as describing hot rocks, volcanic activity or heat derived from deep within the earth. Though some confusion arises when the term "geothermal" is also used to apply to temperatures within the first 100 meters of the surface, this is "Earth heat" all the same, though it is largely influenced by stored energy from the sun."

Regards Mattie

Garage_Hermit

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Reply with quote  #5 
good point !

I am one of those laymen that confuses it with magma and volcanoes !
(and I even did Greek !)

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
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solardan1959

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Reply with quote  #6 
Mattie,  I don't know, or really care what we call it, but Geothermal tubes sound better than earth heat tubes to me.  Ground source tubes does not really ring a bell either because nobody would know what we are talking about, sounds like water pipes or something.  When I lived in Arkansas I used to think about these for cooling but never really thought to much about them for heating.  Still a little cold for living room heat though maybe fine for a greenhouse.  Plus my heating bill was maybe 200.00 dollars a year.....

Anyways, thanks for the schooling, the info might come in handy some day.
Dan
mattie

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Reply with quote  #7 
All good SolarDan
Geothermal sounds fancy,that's probably why it gets used more.Doesn't change my day or anyone else's, the world keeps turning.
Regards Mattie
Garage_Hermit

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Reply with quote  #8 
Dan said:

Ground source tubes does not really ring a bell either because nobody would know what we are talking about

Have to disagree for once, Dan: part of the role of this site is educating folks while we are educating ourselves...

So there's 817,000 hits for this term on the Web, today !

of which this one...

http://en.wikipedia.org/wiki/Geothermal_heat_pump

Ancient Chinese Proverb:
"The beginning of Wisdom is calling a thing by its proper name"

G_H


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JohnGuest

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Reply with quote  #9 
Quote:
Originally Posted by mattie

We will have to watch how the build takes place in order to judge properly,a problem i see with a lot of these systems is the availability of  proper performance data which will prove how well they run.It does mention instrumentation in the first clip, I don't know whether its for real time or logging.
Regards Mattie



Its very clear from the design that this one wont perform very well. The long tubing lengths and serpentine layout limit the amount of airflow that can be used, it also increases the running cost. The single layer of tubing limits the amount of mass in proximity of the tubes, which reduces both the heat exchange efficiency and the capacity.
I completely agree that very few of these systems collect enough data to validate the performance. In the case of the system in the pic, i suspect it was copied (warts and all) rather than designed as the flaws would have become apparent very early in the design stages.




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