Do-it-yourself solar collector for the pool. Heats the water at no cost and extends the bathing season
Midsummer. The hottest time of this season is ahead. The best way to cool off in the heat is a pond or pool. But not in all regions of the country the water warms up quickly after cloudy days. And not everywhere there are many days with a heat of +30 gr. I propose to look at the options for heating water in the pool that do not require the consumption of electricity or fuel - options for heating from solar collectors.
The photos show the Kokido Keops K835CBX solar collector. Its cost is from 11 thousand. rub. And it is a transparent dome made of thick PVC film, inside which a plastic corrugated tube is laid. Perhaps even a corrugation for outdoor wiring. It is connected in series-parallel to a pump that filters water (more on this point below).
On a clear day, the sun heats up the water in the tubes and when the water circulates in the system, the water in the pool itself heats up. For faster warm-up, you need 2-3 such modules. The design is extremely simple and the materials are readily available.
Many examples of homemade products can be found on the Internet. Here are a few of them.
A flat box is made of bars and plywood. The inside is painted black (for better light absorption). Next, a HDPE pipe with a diameter of 25 mm or even a black rubber hose is rolled into a spiral. It is also advisable to paint the HDPE pipe in a more black color. The pipe is fixed on the base with clamps for a corrugated tube for electrical wiring or on pieces of perforated metal tape. It is desirable to insulate the box.
The cost of a HDPE pipe 25 mm is a maximum of 50 rubles / m. On average, you will need 20 m. Part of a plywood sheet and a block of 50x50 mm. Also EPS or foamed polyethylene for insulation. A total of 3,000 rubles.
The box is covered with transparent plexiglass or polycarbonate. You can even use a simple plastic wrap - so that the heat does not escape from the box. I suggest watching a video where the author conducted experiments with different pipe winding densities, with a closed and open system, made measurements and showed everything on the graphs:
In short, he got the following data:
Characteristics of options for homemade solar collectors in different designs in the middle lane.
Having spent about 3 thousand. rub. with this heat collector, you get heated pool water. According to reviews, the solar collector allows you to increase the water temperature by 4-5 degrees. compared to the ambient temperature. If it is a sunny day, but the air temperature is 22-25 degrees, then the pool will warm up to a comfortable 26-28 degrees per day. And if the heat is set at +30 g, then the collector will do it much faster.
If the collector has heated the water to a comfortable level, then the pumping of water through it must be shut off without stopping the pump for filtration. To do this, simply cover the collector with a thick cloth, or initially its connection must be made in series-parallel with a tap to shut off the flow of water through it.
If your pool is installed in a greenhouse dome or other arched closed structure, then using such a heat collector, you will extend the swimming season by 2-3 times.