You are correct in your assumptions about excessive time spent under stagnation conditions.
The sks4 panels operate at a very low flow rate normally and they utilize steam back when the load is satisfied, so yes they can be under stagnation conditions frequently during the summer month's. All systems need to be designed properly to minimize stagnation temps.
I would not recommend installing 10 sks4 on a roof in direct sunlight for solar thermal heating or any non drainback system for that matter with out a way to handle the excess production during the summer month's. A dump zone would be required, or as is the case in the simulation that I posted 3 panels were to be mounted on the roof for domestic hot water year round. The remaining 7 panels were to be mounted under a 3 ft existing overhang on the south wall of the barn at a 75 degree inclination. The panels would be shaded during the summer month's.
The sks4 panels operate at a very low flow rate normally and they utilize steam back when the load is satisfied, so yes they can be under stagnation conditions frequently during the summer month's. All systems need to be designed properly to minimize stagnation temps.
I would not recommend installing 10 sks4 on a roof in direct sunlight for solar thermal heating or any non drainback system for that matter with out a way to handle the excess production during the summer month's. A dump zone would be required, or as is the case in the simulation that I posted 3 panels were to be mounted on the roof for domestic hot water year round. The remaining 7 panels were to be mounted under a 3 ft existing overhang on the south wall of the barn at a 75 degree inclination. The panels would be shaded during the summer month's.
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