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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lilian07
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Re: My big solar thermal project




by lilian07 » 31/03/18, 18:16

Hello,
I find the diagram still a bit complex.
Why not favor with a drain back a large plastic tank is tank in tank systems in the tank. The problem is likely to be corrosion.
Is your circuit drain back is it at a place on the circuit?

In any case, nice work.
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dede2002
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Re: My big solar thermal project




by dede2002 » 01/04/18, 14:46

Hello,

The diagrams are only tests, I will make the real plan when it will be finished ... : Mrgreen:

Actually to simplify I will put a large stainless steel solar water tank, from which I will circulate the heat.

For pumping and siphon circuit, I think it is impossible because on a descent of 12 m. the water will evaporate ... An easy solution is to put a tank in height to reduce the work of the pump, and allow at the same time a descent siphon.

Here is a sketch, with perhaps an automatic trap system at the top to block the water and let the air through.

Another advantage is that there will be less evaporation because the water in the tank, in contact with the air, will not be heated.

schema solar-house.jpeg
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lilian07
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Re: My big solar thermal project




by lilian07 » 01/04/18, 15:31

Yes, the idea of ​​intermediate storage to avoid 12m is good.
You can expertly close your intermediate tank to prevent it from coming into contact with the air.
In this way you avoid corrosion.
Have you thought of storage in the ground because you will have a surplus in summer?
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Guglielmi Antonio
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Re: My big solar thermal project




by Guglielmi Antonio » 17/05/18, 17:28

Hello,

The 24v circulator of the 24-26 303 class 5 boiler is not a small circulator but a real circulator with the same performance as the 230 volt, height 6 meters.

Have a good day,
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dede2002
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Re: My big solar thermal project




by dede2002 » 14/08/18, 17:21

Hello everybody

Voila, it's been 2 weeks that the oil boiler has not started!

Pumps purr, 12 l / min per group of panels, PVs ensure when there is sunshine, as soon as a cloud passes the batteries take over, and the cloud passes charging. The pumps consume 86W each, the good surprise is that once the circuit starts it turns to 0.7 - 0.8 bar.

I added PC power supply fans, because otherwise the engines quickly exceed 100 ° (on the record it is 100 ° maxi). With the fans it stabilizes at 70 - 75 °, whatever the temperature of the water.

Some pictures:

A module 3 cylinders

module1.JPG
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module2.JPG
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This one was pierced by rust, I sold it, There is only the central cylinder which is stainless steel, the outer shell is steel. Unfortunately, but I realized too late, welding the steel shrinkage tensions have cracked the stainless steel ... but my welding does not leak!

The interior of a stainless steel cylinder, capacity 112 liters.

module3.JPG
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The 3 modules of the ecs, that of the center is pierced but is traversed by the primary water ...

module4.JPG
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The 4 cylinders module which is the solar boiler.

module5.JPG
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module6.JPG
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The circulator of the primary.

circul.JPG
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The connection of the primary to the boiler.

chaudière1.JPG
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Pumps 24V, the start is not yet automatic because a single pump can not start the circuit, to start I start 3 pumps, about 3 minutes after I cut the pump down and I open the valve .

pompes1.JPG
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The electrical panel with a voltmeter for each battery.

watt1.JPG
watt1.JPG (365.87 KIO) Viewed 6348 times


A+ :)
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dede2002
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Re: My big solar thermal project




by dede2002 » 14/08/18, 21:30

Obviously I isolated the modules, live because I started to heat as soon as everything was waterproof :P

module7.JPG
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module8.JPG
module8.JPG (287.03 KIO) Accessed 6339 times


I have to bend all this, and especially to automate the system!
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dede2002
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Re: My big solar thermal project




by dede2002 » 03/03/19, 17:43

Hello :)

Here is 7 month that it turns, the pumps circulated 1200 m3 water (always the same) in the panels, 825 operating hours (24 l / min on average).

In the meantime, residents have been drawing 124 m3 hot water! About 40% oil and 60% solar (estimate 3700 kWh solar), from November to January it produced very little, in February I could do 20h solar heating in addition to the ecs. to 14h if the ecs is hot, I open the valve and solar heats the boiler (I unplug the burner), it works well live.

Otherwise, the system is automated, I found a pump that can start, and with relays the heat exchanger circulator starts at the same time as the pumps. The delta t ° is set to 20 ° for the start and 2 ° for the stop, at the beginning I had problems of untimely stop at the passage of a cloud, I even tightened a pump because at restart it There was still air and it did not start.

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Philippe Schutt
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Re: My big solar thermal project




by Philippe Schutt » 03/03/19, 19:51

At 10kwh per liter of fuel oil, it is already 370 liters won in 1 months.
Chapeau!
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dede2002
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Re: My big solar thermal project




by dede2002 » 04/03/19, 09:21

In 7 months, not 1 months! (or 4 months if subtracted nov-dec-jan)

Although it still produced a little bit, the days of sunshine. I will try to do the calculation month by month, since I read the meters regularly. I have an hour counter on the charge pump of the final water heater (oil), I refer to the measurements made in summer before the solar, but it is not very accurate because in winter the boiler also heats the radiators while charging the water heater.
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Christophe
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Re: My big solar thermal project




by Christophe » 04/03/19, 11:26

Nice building Dede! It is heavy! It reminds me of Tigger's installation: Solar-thermal / solar-installation-the-wood-of-Tigger-with-buffer-thermal t5200.html

How did you recover and at what price the ECS horizontal heat exchangers?

This is industry equipment or hospitals that! 8) In nine it must be severe!
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