Filling the pressure: Sizing an expansion tank correctly
All plumbing coming out of the collector array MUST drop down several feet to form a thermal lock or trap for the steam in the collectors. The liquid/steam must not migrate at all. Water expands 1,130 times when it flashes. If in any way it can migrate and flow out of the collectors, it’s not possible to have a large enough expansion tank. With this understanding, you can now start making the calculations you need. For example, a single 4’x10’ collector holds 1.3 gallons of water. Read more:- https://askrod.com/sizing-expansion-tank/
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