Question about expansion of the tubes between sensors and tank

[owen]

Hello,

I'm thinking about my solar thermal DHW / heating supplement project.

My question is How to choose the size of the tubes to avoid expansion of these tubes?

We all know that metals undergo the expansion of bodies under the effect of heat.

Although the tubes are insulating. I ask myself the question on the choice and the size of the tubes?

Can you give me your opinions?

The distance from the furthest sensor to my heat tank exchanger is 22, taking into account the right angles. It is not a direct path. The sensors will be installed at 90 ° on the roof. The ball in the cellar. And so my fear about the expansion of the pipes.

How do you calculate the dimensions of your tubes for both the outward and return journey?

Can you use rubber tubes with 20 or 22 mm diameter garden hoses between the sensor both for the outward journey and for the return to the beginning of the entry into the cellar and to finalize the journey either with flexible tubes or copper to supply the heat exchanger?

please

[the middle]

Hello, maybe we should say more about your future installation.
1) We sell special tubes for this kind of thing, in insulated copper.
2) The diameter of your tubes is to be determined in relation to the type of sensor you will have, as well as to the total area of ​​your sensors
(if you put too large tubes, you will have losses on the way, because of the amount of water in the pipes, and unnecessary losses on the surface of the copper pipe)
These two points are important.
Afraid of dilation? no

[Capt_Maloche]

For dilation, dilatoflex or dilatation sheets are placed if the lengths of straight tubes are greater than 10m

For the expansion of the water, an expansion tank is placed

The size (diameter) of the tubes only depends on your flow

[the middle]

The size (diameter) of the tubes only depends on your flow

And I said: it depends on the surface of the sensors.
The two are linked:
When I self-built my system, I told a specialist that I had put 22mm diameter copper pipe; he replied ho! 22 mm is for 3 or 4 sensors of 4m square.
In my case, with a vacuum sensor, he told me that 12 square would have been preferable for the reasons that I explained on my previous post.
The power of the circulator also changes with the number of sensors. (I think that of Christophe is 600w
And mine + - 50w), but the sensor surfaces are radically different

[the middle]

For dilation, dilatoflex or dilatation sheets are placed if the lengths of straight tubes are greater than 10m

It is true that at home, a large part of the piping is not fixed, so it moves as it wants.
sorry for my mistake

[Cuicui]

The power of the circulator also changes with the number of sensors. (I think that of Christophe is 600w
And mine + - 50w), but the sensor surfaces are radically different

My circulator is 120 W for 40 m2 of sensors.
The circuit includes a few elbows, this helps to let the expansion play. I also avoid, as much as possible, rigid fixings.