Solar collector - heating water in a small pool

A question from a slightly different barrel:
what effect will the use of a 3-pane window in the DYI panel have compared to a single-pane window?
I designed a panel on the OSB board, including 100 meters of irrigation pipe fi25. Yes, I know, there could be a better pipe. But the question about the glass!

btxxrv750 wrote:

what effect will the use of a 3-pane window in the DYI panel have compared to a single-pane window?

If we assume that the windows will be clean, it's probably nothing. It will be the same as with one glass.

Hello

A triple-pane glass is possible - unless it has filters blocking some part of the light - so a single pane is a good solution because its task is to penetrate the rays into the hose and block the heat so that it does not go up and that the wind does not cool the hose.

The hose and the whole structure are best painted black and then covered with a glass.

Give me some photos of your construction.

Ha ha, I knew the topic would come back, just a few hot days is enough and everyone starts looking
I am also seriously thinking about making a small (min. 1 m2) solar collector.
Of course, I want to get all the materials from what I already have.
As for the glass, I have a small choice:
- use a few small panes from the greenhouse (100x60cm each)
- use the glass from the table, BUT with rounded corners (140x80xm)
Is it a better idea to combine several panes into one pane, or is it easier to use the large one?
Allow me to insert photos from the construction site in this topic (although I'm beginning to doubt that I will make it before the end of this season).

greetings
Mariusz

metalMANiu wrote:

Ha ha, I knew the topic would come back, just a few hot days is enough and everyone starts looking

And that's the strangest thing I have not heated the water at all for several days. In the morning I have not less than 29 degrees, and in the afternoon usually 32-33 degrees, which I will stretch under the cover.

Hey, of course, paste photos - as for the glass you can order to size - it's not that expensive - I did - I know that there were versions of the collector made of plexiglass, the ones with channels also warmed up nicely and nothing happened with the plexiglass from the heat.

As if what is it, go ahead - the collector works for me for a few nice years, removed for the season and works quite well, the only thing I changed is the 30W solar panel I put on the pump, the water circulates faster and the water cools faster.

It is true that the pump at 12V should not work constantly, but in my case with a 30W panel in the sun and the pump connected to it, the voltage is about 8.5V and it works like that and nothing is happening to the pump.

Greetings ....

DJCheester wrote:

Hello

A triple-pane glass is possible - unless it has filters blocking some part of the light - so a single pane is a good solution because its task is to penetrate the rays into the hose and block the heat so that it does not go up and that the wind does not cool the hose.

The hose and the whole structure are best painted black and then covered with a glass.

Give me some photos of your construction.

Well, it looks like the picture.


OSB 12mm (2500x1250mm) reinforced with a batten on the bottom, painted black mat, and 100 running meters (or actually 96 entered) of the irrigation pipe fi25 = 30l of water. Connected to a circulation pump and it flows slowly. At the moment, I run the water every hour for 15 minutes with an ordinary time controller, not a thermostat.
I wonder what the difference will be after using the glass. I have a piece of a window available for free: one triple pane, 2470x1000mm, so almost all of it.
They sang me about PLN 600 for plexiglass, so sorry but no. It is supposed to be at cost.

The pool has a capacity of 7-8 m3. I do not really hope that I will be able to heat the water properly, maybe 1-2 degrees Celsius. I treat the construction of a solar panel more as gathering experience to someday make DYI for DHW heating
Well, thanks for all the advice!

Cover it with the glass, and seal it tightly. The effect should be better. The second thing is, the scrolls cannot overlap each other because it's nonsense.

Rezystor240 wrote:

The second thing is, the scrolls can't overlap each other because it's nonsense.

Oh dear, only 2 coils came down because something "didn't bang" ;)

btxxrv750 wrote:

OSB 12mm (2500x1250mm) reinforced with a batten on the bottom, painted black mat, and 100 running meters (or actually 96 entered) of the irrigation pipe fi25 = 30l of water.

1. How much can all this weigh when empty of water?
2. How do you carry it?
3. Do you think that in a similar budget it is possible to find a pipe that could be better "packed" and filled with it the entire (or almost the entire) surface of the collector?

Maybe a single-panel steel radiator would be cheaper, but also better than 100m of such a thick pipe. Link to the 60x140cm radiator (new) for PLN 100: https://allegro.pl/oferta/grzejnik-panelowy-quinn-600x1400-c11-jednopanelowy-9576317626. In my opinion, such a heater:
- it is much lighter than a solution with a hose (both with water and "dry"),
- uses the surface much more efficiently,
- easier and faster assembly.

As for covering the collector with the tube with glass, a man from the east checked it:
[youtube]https://www.youtube.com/watch?v=gHjbdaSsk-g?t=240[/youtube]

The collector from the radiator seems to be a nice solution, and here it is similar, I do not know how price it is.

metalMANiu wrote:

Rezystor240 wrote:

The second thing is, the scrolls can't overlap each other because it's nonsense.

Oh dear, only 2 coils came down because something "didn't bang" ;)

btxxrv750 wrote:

OSB 12mm (2500x1250mm) reinforced with a batten on the bottom, painted black mat, and 100 running meters (or actually 96 entered) of the irrigation pipe fi25 = 30l of water.

1. How much can all this weigh when empty of water?
2. How do you carry it?
3. Do you think that in a similar budget it is possible to find a pipe that could be better "packed" and filled with it the entire (or almost the entire) surface of the collector?

Maybe a single-panel steel radiator would be cheaper, but also better than 100m of such a thick pipe. Link to the 60x140cm radiator (new) for PLN 100: https://allegro.pl/oferta/grzejnik-panelowy-quinn-600x1400-c11-jednopanelowy-9576317626. In my opinion, such a heater:
- it is much lighter than a solution with a hose (both with water and "dry"),
- uses the surface much more efficiently,
- easier and faster assembly.

1. The weight of the dry panel is about 30 kg.
2. Due to the dimensions, two people are needed, but then no problem. I set up once at the beginning of the season and there will be one shelter after the season. A friend suggested mounting wheels - also not stupid.
3. Yes, it seems to me that, for example, a 16mm pipe would be better, preferably alupex, because it is easier to form. Then the surface would be better filled, but again this pipe will need about 250m to get 30l, so it will be more expensive, and for that you need a more powerful pump to push it through.
On the other hand, a pipe diameter of 25mm is quite a lot of water to be heated, assuming a continuous flow ... So here the 16 will work better.

A panel radiator may be cheaper, but its capacity is about 5 liters, so I would have to put 6 of these (I have 30l in the pipe)! And this is a cost several times higher than that of a pipe. Additionally, space for 6 heaters: - /
At the moment, the whole thing cost me about PLN 400, including the pump, so pretty good.

This movie in Russian is probably cool, but it would be good to understand something

This is not about water capacity, but about the surface that the sun is looking at. Therefore, such a panel heater can be as good a solution as a tube.

Cool collector cover with glass and do not worry, it works for me, you can fold several panes, as long as the whole is relatively tight, then warm air under the glass, gray pipe and not escaping on the sides ;)

greetings

The power of this solar collector based on a hose, despite its 30l capacity, will have a rather poor efficiency. In the best winds, the sun is used only for 1/3 of the snake's surface area (this is where the sun shines). The collector based on a panel heater is light, easy to empty of water during the winter, you can make a detachable multi-element one depending on the required power. I'm not saying it's a bad idea, but it's better. The radiator is metal, thin-walled and has a low heat capacity and will transfer heat to the water faster. PVC (because hoses are probably made of it) is not great when it comes to heat transport.

Taking into account all the data provided, the surface area of this pipe with a length of 100 m gives us 7.5 m2. If we assume that 1/3 (optimistic) of this hose is exposed to sunlight, it gives us 2.5 m2 of water heating area. The 3 new heaters given 2 posts above give a similar area - 2.52 m2 with a smaller size and lighter structure. In winter they are easier to hide, you can put the whole structure on quick-couplers. And you definitely need to cover both structures with glass for a better effect.

After all, the idea of using a hose is interesting.

Hello

I have a collector from the first thread for a few years I do not have a small pool and I did not mean to "boil" the water, only heat it slightly, the collector is sufficient for a small pool, these 5000 l pools will not heat up for sure - here the colleague above is certainly right with the heater As for the problem of emptying the hose for the winter, I do not have any problem, I simply blow the water out of the hose with the cooling unit and hide it for the winter after the season.

For a larger pool, I would certainly improve the structure by using a few panel heaters closed under the glass - and painted black mat.

Greetings ...

Hello, I have a question, what is the best way to connect the fi 16 pipe to the pump spigot, which I think is fi32?