My (large) solar thermal project

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dede2002
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Location: Geneva countryside
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My (large) solar thermal project




by dede2002 » 22/12/13, 16:52

Hello everybody,

I show you my project:
Location Geneva countryside, 46 ° north, 500 m.
Large house (or small building ...) sheltering families 4, 18 people on average.

Conso DHW, hula it goes fast, sometimes the 300. ° to 60 1 go on h ...

So to begin, on the roof I could place two panel groups at the height, aligned at the bottom of the main stack, 4 ml south side and 6 ml SE, on 2.5m, high.
I intend to use the small chimney below to get the ducts of the panels.

Here is a picture, photo editing to locate the panels.
The roof is exposed to 150 ° (S-SE) and inclined at about 30 °

Image

I started a spreadsheet, to simulate the use of 2 panel groups separately, less in summer and in winter.
theoretical approach, the heat losses are not taken into account.
The solar yield to be determined according to the seasons and the roof angle.
Below, a comparison between the energy needed to complete the panels and to heat the contents.

Image

And here is my first test with Dia :D

Image

The panels air tank is an old water heater 60l.
I'm all ears for your feedback!
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dede2002
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by dede2002 » 22/12/13, 19:00

I just saw an error:
In the air supply is air operation.
The rest will be up.
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dede2002
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by dede2002 » 25/12/13, 10:50

I start in the first picture I made an inversion formula, I hope this time it's good.

What do you think about the performance of heat transfer buffer DHW?

Image

Image

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dede2002
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by dede2002 » 25/12/13, 16:17

Image
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Philippe Schutt
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by Philippe Schutt » 25/12/13, 23:06

if I understand it, you better put the ball in the attic 60L, otherwise it will take you a big pump Ps1, which consume a lot of power ... but low enough so that the panels are empty.
and what do you think of adding a heat exchanger, for not nearly glycol 2000l?
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dede2002
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by dede2002 » 26/12/13, 10:50

Hello Philippe Schutt :D ,

2000 l. glycol would make a bit much ...

I can not place the tank in the attic because they are inhabited, and the rooftop cellar link will pass through a conduit of unused fireplace.

The total volume of coolant will be about 100 l.
The two balloons will be filled with DHW and heating water.

The level of the fluid at rest will depend on the liquid / air volume ratio.

The pump will push air into the tank, then the circuit will siphon part, the pump will then conquer the height of fall in the tank and the pressure drops.

The energy needed to complete the panels is much less than that contained in the hot water that comes home at night.

I was inspired here for this installation: http://conseils.xpair.com/actualite_exp ... isques.htm

In fact I asked several quotes for business, but everyone wants to place its gear, and trying to discourage me from mounting a draining system.

If I replace the air tank with an expansion tank and I purge the signs, I find myself with a conventional circuit under pressure.

In self-emptying can theoretically put pure water, but it depends on the panels to drain completely.
With a little antifreeze I limit the risks, the boiling point will be higher and the protected circuit corrosion.
Besides the purpose of the closed circuit is to avoid repeating oxygen.
It will nevertheless I to choose antifreeze that does not foam!
I hope I have been understandable.

A + and happy holidays
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Philippe Schutt
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by Philippe Schutt » 26/12/13, 15:15

ah yes, the time for me, you use balloons to streamers.

The pump will have to overcome the reservoir pressure? Yet this is also pressure pump side ... I would say it has to overcome the height difference of the water column.
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dede2002
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by dede2002 » 26/12/13, 17:44

The pressure in the tank should be the height of water stopped (1bar) + that due to the heating of the air (1bar).

I'll be curious to observe the gauge.

The drop height when the circuit started is between the tank top and the level (0.5 m.).
Once the circuit primed the pump can charge less.

I question the usefulness of separate panels for the summer?
If I leave everything I risk having too much power for the exchangers> system that stops before having heated all the stock> restart with overheated panels ...
Or obligation to wait until tomorrow to restart?
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Philippe Schutt
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by Philippe Schutt » 26/12/13, 18:23

1 bar in the tank, but the pump does not need to push 1 bar, but just missing the height of water or ideally, the height of the panels.

why should he stop before any heated? and it could not heat 2 balls at once?
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dede2002
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by dede2002 » 26/12/13, 19:31

Yes if the two interchanges arrive to evacuate the power 25m2 in summer?
Otherwise the return to the panels may be too hot?
within modulate the flow of the pump, and playing on the performance of high-temperature panels?
In any case send water in a full air panel 180 200 ° ° or does not inspire me, thermal shock and boiling liquid ...?

After it is clear that if the stock is hot in the morning in summer, I can just wait until the next day.

Pressure is the pressure at the pump inlet, necessary to avoid cavitation.

Once primed circuit, the circuit is equivalent to pumping water down the tank to make it to the top of the tank, a height of 0.5 m.

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