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Greenhouse for Mediterranean climate

 
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Hello colleagues;

I need your help and advice, As I'm designing a greenhouse in Bethlehem, Palestine, the Middle East, Mediterranean climate.
Which will be mainly for Aquaponics production and a small commercial nursery.
I'm a Permaculture designer for the last decade.

All great resources I cam across on greenhouses mostly come from moderate or cool climates, where everybody is interested in gaining and storing heat.
in our climate of cold winters and hot dry summer it's quite challenging to find the right guidance to face the cold wet winters but also the hot blasting summer.

The greenhouse I'm designing has the following details:
is facing south. (good? or too much heat?)
transparent sides on east and west (good?)
Roof Angle: 45 Degrees
metal skeleton
incorporating a store and a cafe
Mostly intensive Aquaponics growing inside (NFT, DWC, Media)
Seeding shelves

For climate control, It's supposed to have:
Trombe water wall at the back to store heat in winter at low sun angles
GAHT (Ground to Air heat transfer) system of 2 layers for cooling and heating
vents at the top north and bottom south
2 large doors at south and east
Shade cloth on the south side in summer
double glazing
insolated north walls
few animals at the back for providing heat

But I'm still wondering about climate and weather, will it really be comfortable enough to be in, also to stay and have a drink in the tiny cafe.
also, wondering if the roof angle is right?
do I need to insulate ground under GAHT system?
Can I rely on light instead of direct sunlight in summer?

I would really really appreciate the advice for our specific climate to produce a good project.

Kind regards
Screen-Shot-2020-05-12-at-16.19.25.png
dimensions
dimensions
Greenhouse.png
only greenhouse
only greenhouse
Full-View.png
the full site design
the full site design
Screen-Shot-2020-05-14-at-17.31.46.png
2 roof options, in June
2 roof options, in June
Screen-Shot-2020-05-14-at-17.30.37.png
2 roof options,, In Jnanuary
2 roof options,, In Jnanuary
 
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Posts: 866
Location: France, Burgundy, parc naturel Morvan
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I am no expert on the matter, i have a hoop house in mid France, it was 48 degrees Celsius in there a week ago, it's only May. It is open on both sides and still very hot at times. Unbearable, sauna like temperatures. It's shaded by a giant ash tree closeby from around 4 o'clock.
Where you are it is much hotter and the sun more intense.
Ddn't Geoff Lawton have this series about greening the dessert? Maybe they have got more information.

https://www.youtube.com/playlist?list=PL321kfqP1fZnWTPPpqZUN9ntP2-rjIP39

I've seen people here in France who have these houses, they're low at the back into a hill for instance and the roof is one piece slightly angled up, with big open windows in the front, but the roof has an overhang of two metres or something. It was facing south. And they had calculated the angle of the sun in summer and in winter time. The overhang blocked the high sun from shining and heating the place in summertime, because it is underground, the earth mass coolness kept the place cool. In winter the place was kept warm because the sun was low and could shine under the overhang and warm the place up passively. Beautiful design. I can imagine in your case even this will be too hot in summer, then you could have something like a grapevine growing in front of the window to keep the reflected sunrays from entering, the effect is very nice. Maybe a climbing plant like a wisteria on a rack to prolong the overhanging roof. In winter it will have lost the leaves, i don't know if grapes and wisteria grow where you are, but there must be something that has leaves in summer and drops them in winter, or not?

In the Geoff Lawton series there was this lady who was propogating plants on the north side of the  house, it cost less water and was less hard on the plants.
 
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Location: Abkhazia · Cfa (humid subtropical) - temperate · clay soil
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While I don't have answers to your questions, I do have a similar problem…
A neighbor has a very simple greenhouse made from ~4mm poly-carbonate. It got way too hot a month ago. Now it open on two sides.

I have come to the conclusion that some way of actively regulating the amount of heat input will be necessary (like having a shade cloth that can be pulled in front of the glass).

>  Roof Angle: 45 Degrees
I would go steeper, but that is just from intuition.
 
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Hi Shimo
I know this is an old post, but where are you at ? Can you show us what you did finally ?

Hugo, do you come to the SW of France sometimes, would nice to meet.

Did someone implement GAHT system already ?

Cheers
 
I found a beautiful pie. And a tiny ad:
Greenhouse of the Future ebook - now free for a while
https://permies.com/goodies/greenhouse
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