Garden: landscaping, plants, garden, ponds and poolsHeat exchanger: titanium or stainless steel? Or other... ?

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Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby epfyffer » 09/04/20, 08:11

Hello,

In my project to heat my pool with a heat exchanger heated by my solar collectors, I recovered a heat exchanger which was used for a 40m3 pool, without mark, and for a bite of bread.

I have since read that salt water (disinfection of water by electrolysis) can destroy an exchanger if it is not made of titanium.

Having no info on the product, how do you know what it is made of? I tested with a magnet, the outside is not very reactive to the magnet, while the tubes inside are super glued to the magnet ... No more info than that for the 'instant.

My questions :
1. how to determine the metal in question?
2. if I mount this system on my installation with hydrolysis, what will actually happen?

Thank you
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby epfyffer » 09/04/20, 08:47

20200409_075951.jpg


20200409_080030.jpg


Here are the images of the exchanger.
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby izentrop » 09/04/20, 11:13

Otherwise you disinfect with ozone, there does not seem to be electrolysis https://piscineinfoservice.com/equipeme ... -ozonateur.
What do you all have with swimming pools right now, water is the crucial problem of the future, but why not use it as a rainwater tank. : Wink:
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby Flytox » 09/04/20, 11:59

epfyffer wrote:Hello,

In my project to heat my pool with a heat exchanger heated by my solar collectors, I recovered a heat exchanger which was used for a 40m3 pool, without mark, and for a bite of bread.

I have since read that salt water (disinfection of water by electrolysis) can destroy an exchanger if it is not made of titanium.

Having no info on the product, how do you know what it is made of? I tested with a magnet, the outside is not very reactive to the magnet, while the tubes inside are super glued to the magnet ... No more info than that for the 'instant.

My questions :
1. how to determine the metal in question?
2. if I mount this system on my installation with hydrolysis, what will actually happen?

Thank you


Titanium is perfectly suitable for an exchanger, but it is not magnetic, so everything that sticks to the magnet must be made of steel (or nickel if you are very rich : Mrgreen: ).
The photo seems to show a mixture of plastic (vertical fittings), steel (horizontal inlet and outlet fittings) and may be stainless steel in the interior pipes.
When you have water which contains salt among other things, it is very prone to corrosion especially if there is a mixture of metals in the installation.

https://fixation.emile-maurin.fr/custom ... ldoc12.pdf

corrosion-galvanic-infra-ldoc12.pdf
(45.62 Kio) No downloads


The problem with electrolytes is that corrosion ends up piercing the pipes (possibly very quickly depending on the conditions).
Finally you may not be a saltwater swimming pool, but as a rule the less you mix the metals the less you get carried away. The "all" plastic (except the exchanger) avoids many problems.
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby Ahmed » 09/04/20, 12:33

Stainless steel can be magnetic or not, depending on its composition ...
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby Christophe » 09/04/20, 12:48

Yes chlorine "eats" stainless steel.

Salt electrolysis, often sold as "green" is only a continuous chlorine regeneration. Not very healthy or ecological therefore ... the advantage is that we handle salt instead of Chlorine ... That's already won!

At first glance, your exchanger is not made of titanium: the titanium parts are much duller (less shiny) and tend towards a "brownish" color ...

Here are titanium parts:

piece_titane.jpg
piece_titane.jpg (53.84 KB) Viewed 1208 times


195314.jpg
195314.jpg (250.14 KB) Viewed times 1208
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby GuyGadebois » 09/04/20, 12:52

It seems to me that stainless steel 316 is resistant to chlorides.
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby Christophe » 09/04/20, 13:05

Given the poor quality of construction of this exchanger (which uses galvanized parts in particular) do not rely too much on the use of "thoughtful" and probably expensive material ... I could be wrong ...

After it may be 10 years to pierce 1 mm of stainless steel with the concentration of chlorine found in a swimming pool ...

So good ... a bite of bread for 10 years, the math is quick! : Cheesy:
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby sicetaitsimple » 09/04/20, 14:11

Christophe wrote:Given the poor quality of construction of this exchanger (which uses galvanized parts in particular) do not rely too much on the use of "thoughtful" and probably expensive material ... I could be wrong ...


Not sure that the "galva" elbows are original with the exchanger. Maybe from the previous installation.

Besides, they are I think on the closed circuit "brine", no problem.
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Re: Heat exchanger: titanium or stainless steel? Or other... ?

Unread Messageby epfyffer » 09/04/20, 14:21

Thank you for your feedback,

Indeed, the galva is on the solar circuit and the plastic sleeves are used for the swimming pool circuit.

I wonder what the part that is painted in blue is made of ... it is non-magnetic, only the solder and the ends between the solder and the galvanized fittings react to the magnet. The interior (the glycol circuit), which must be made of stainless steel, sticks completely to the magnet.

We have a swimming pool filled with irrigation water, at my place it is non-potable water recovered from torrents and used for watering.

Salt water is especially pleasant when you bathe in it, that's why we chose this system. Also to avoid stinking chlorine tablets ...

If I decide to mount my exchanger all the same, it would still hold 1 or 2 seasons or it pierces in 2 months?
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