epfyffer wrote:As I am sure to understand, you suggest that I mount the exchanger on the cold line without any modification, and that I activate the pump automatically by my regulation when the temperature of my cumulus is sufficient? And indeed, no more big modification needed ...? If that's the idea, will the passage of the solar cricuit in the pool exchanger lower the temperature enough so that the cumulus does not continue to heat? And if it cools down really very much, are we not going to cool the cumulus if at the sensor outlet then we are less hot than the temperature of the balloon? This is where I see a possible problem with this solution right?
Yes, that's the idea. You said that your exchanger was a priori of a dimensioning greater than your needs, so that could do it.
There is no reason for the cumulus to continue heating if you choose the right temperature threshold to start the "pool" pump, that's why I spoke of a temperature "representative of" a plus or less "full". Is it 40 °, 50 °, ... for the temperature of the heat transfer fluid leaving the balloon, I don't know, you will have to grope, it actually depends on the characteristics of the exchanger, the flow rates, ....
As for the "cooling" of the cumulus, well you just stop the swimming pool pump on a lower temperature threshold (for example 10 ° C, again it will be necessary to grope) than that which generated its engagement.