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Old 13th February 2017, 09:16   #81 (permalink)
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Re: solar panels

Just searched and found the proper name for this system:

"WORKING PRINCIPLE of Heat Pipes and Heat Pipe Solar Collectors
The heat pipe is hollow with the space inside evacuated tube. In this type of solar water heater, the insulation is not the goal, but rather to alter the
state of the liquid inside. Inside the heat pipe is a small quantity of purified water and some special additives. At sea level water boils at 100 C, but
at the top of a mountain the boiling temperature will be less that 100 C. This is due to the difference in air pressure. Based on this principle, it can
be achieved by evacuating the heat pipe. So, when the heat pipe is heated above lower temperatures than 100 C, the water vaporizes. This
vapour rapidly rises to the top of the heat pipe transferring heat. As the heat is lost at the condenser (top of the heat pipe), the vapour condenses
to form a liquid (water) and returns to the bottom of the heat pipe to repeat the process once again."

http://www.kuzeymak.com/en/images/st...ct-catalog.pdf

But need to find a local stockist.

Ian
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Old 13th February 2017, 10:10   #82 (permalink)
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Re: solar panels

Quote:
I think you are right about the water filled tubes, but there must be some which work on a heat exchange system.
They all including waterfilled work on a heat exchanger basis. They are no different from the system in the UK for heating hot water, except they have a solar panel in lieu of a gas boiler as the primary source of heat

Last edited by Chinook; 13th February 2017 at 10:12..
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Old 15th February 2017, 05:55   #83 (permalink)
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Re: solar panels

Could not resolve the service problems with the Kuzeymak Heat Tubes so have settled for a "new" type of flat plate solar panel with a copper core (instead of plastic) and a fancy glass, which they say combines to give 30% better performance than my old standard panels. Half the price (1000TL for two) of Heat Tubes. Fancy new tank with extra insulation.

Ian
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Old 15th February 2017, 09:08   #84 (permalink)
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Re: solar panels

Thanks Ian , please be kind enough to keep us all up to speed with the installation and efficiency of said system.

Very interested.

Ta , Steve
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Old 15th February 2017, 13:36   #85 (permalink)
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Re: solar panels

Ill be glad to.

Regarding the Heat Tubes, local "experts" advised that at the point of installation they will dramatically outperform any other type of solar water heating. The problem comes a little way down the line because of the design of the heat exchanger; where the tube slots into the manifold it is necessarily quite a narrow water pipe to maximise heat transfer, but in high lime-scale areas (like Fethiye) it will soon clog. Also, I could not find a supplier in Fethiye, the nearest being Mugla, which makes maintenance visits difficult and expensive if I do run into problems.

New system installation set for this Saturday.

Ian
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Old 16th February 2017, 18:50   #86 (permalink)
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Re: solar panels

Quote:
Originally Posted by immac View Post
Could not resolve the service problems with the Kuzeymak Heat Tubes so have settled for a "new" type of flat plate solar panel with a copper core (instead of plastic) and a fancy glass, which they say combines to give 30% better performance than my old standard panels. Half the price (1000TL for two) of Heat Tubes. Fancy new tank with extra insulation.

Ian
A year ago I ordered a Kuzeymak heat pipe system from a local installer to replace a flat panel system for heating our swimming pool. When I checked it after installation I realised it was not a heat pipe system, but just an ordinary tube system of much lower efficiency. In fact it was no improvement on the earlier flat panels. The installer said he had been unable to obtain the Kuzeymak system and when I checked directly with Kuzeymak they confirmed they were no longer supplying the heat pipe system.

The supplied tube system had other problems, so the installer agreed to exchange it back to a flat panel system, but this time with prismatic glass, and copper tubes, (like yours, Ian) to improve the efficiency. This works quite well, without the heating the pool temperature is roughly midway between the maximum and minimum shade air temperatures (as you would expect!), and with the heating on the pool temperature hovers around the maximum shade air temperature. The water is circulated by a solar powered pump.

David
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