My (large) solar thermal project

Solar thermal energy in all its forms: solar heating, hot water, choosing a solar collector, solar concentration, ovens and solar cookers, solar energy storage by heat buffer, solar pool, air conditioning and solar cold ..
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Philippe Schutt
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by Philippe Schutt » 19/01/14, 19:08

in the evaporation / condensation tube of a special fluid to reduce the calories in the bulb there is no seal. Water does not enter the tubes. At 160 ° all the fluid is evaporated and its circulation is almost stopped. these panels are drainable.
In the panels where the water passes through the tubes there is necessarily at least one joint or a conical bearing, we must pay attention to the orientation so that they empty but I do not see impossibility.
On the other hand, the issue of snow removal seems insoluble ...
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PITMIX
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by PITMIX » 20/01/14, 07:35

To avoid snow I see the solution of electric rolling curtains. Heating cords would be too expensive and greedy to powered. After it is necessary to hack systems like scraper brooms but it is likely to be complicated and fragile.
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dede2002
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by dede2002 » 20/01/14, 11:13

Hello again,

This choice of sensors makes me turn my head ...
The snow is rather rare that it takes several days.
The question of the overheating of the empty panels disturbs me, In some self-emptying installations there is a discharge radiator for overheating and the self-draining is used against freezing.
In other installations, self-draining is described as the best protection against overheating.
:?:

A guy from another forum has a facility very close to mine, which has been running for a few years, with an interactive diagram in real time.
It's fantastic, see the link below.

http://solaire.open-dream.org/

I will continue my simulations with different sensors, this Simsol software is exciting!

Would there be an equivalent integrating the backup heater?

Here is a table to compare the different angular positions.
the 0 ° line is the result of the calculation of my sheet, and it corresponds to the simulation values ​​"panels" at 0 ° with a margin of error of 2 per thousand.

The 90 ° position would correspond to panels in frontage, seen orientation S-SE they would have nothing the afternoon.

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PITMIX
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by PITMIX » 20/01/14, 18:03

Hello
If the overheating of the water circuits is preventable by self-emptying without risk for the sensors there is no hesitation. For the snow on my roof at 45 ° it is on the bottom of the sensors but when the sun comes out it melts well. Nothing like the amount of snow in your area of ​​course.
Regarding the solar-open.dream supervision it's very beautiful. For lack of means I directed a small ip camera on my solar controller to monitor from time to time. It's convenient but it slams less.
In addition I suppose that it can modify remotely the instructions of the regulators, it is the top, to have curves. A real GTC.
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dede2002
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by dede2002 » 20/01/14, 19:05

PITMIX wrote:To avoid snow I see the solution of electric rolling curtains. Heating cords would be too expensive and greedy to powered. After it is necessary to hack systems like scraper brooms but it is likely to be complicated and fragile.


Electric curtains is a good idea to handle overheating.
For the snow it would be useless, and it would get stuck.
Tube collectors do not have flat glass, snow gets stuck in the tubes.

But here there is rarely snow, I will look for statistics but it is rare to live several days.
And when it does, solar production is generally low.
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PITMIX
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by PITMIX » 21/01/14, 07:36

Hi from what I read about Applying your system with auto-draining is a very good solution to avoid overheating, planar sensors are more efficient in performance and as snow is not a real problem, remains to take action. If you have the opportunity to invest in the GTC for a project like yours it's not just for the weather.
As the other would say "I buy!"
And good luck for the work :P
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Philippe Schutt
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by Philippe Schutt » 22/01/14, 19:38

PITMIX wrote: ... planar sensors are more efficient in performance ...


ah. it seemed to me the opposite, the issue of snow aside.
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dede2002
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by dede2002 » 22/01/14, 20:32

Planar sensors have more useful surface, if one calculates the yield compared to the congestion they have an advantage.

What is GTC exactly?

A+
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PITMIX
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by PITMIX » 22/01/14, 21:48

The GTC for Centralized Technical Management, in other words the real-time monitoring software that you presented to us. I work with this kind of material, it's great because it allows a real-time analysis but also historical, statistical, remote modification of parameters via internet etc.
It becomes almost indispensable on a heavy technical installation because it avoids and simplifies the physical interventions on the machines.
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dede2002
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by dede2002 » 23/01/14, 12:50

Oh yes, I'm interested! I'll have to learn ...

I will have several regulations, one in the gas boiler that manages the ECS and its share of heating, one in the pellet boiler that manages the buffer, heating and DHW.
Obviously it will be either one who will take care of the ecs, not both at the same time.
And one for solar, unless the one of the pellet boiler (not yet bought so at choice) can do it.
That would be nice because it could avoid loading the buffer when there is sun.

I intend to install a dashboard in my living room to monitor temperatures, to start ...

In the meantime I will visit the forum apper, there is something to read for a moment : Mrgreen:
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