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radiant system topology question
Hello all, I have what might be a simple question. I've been pondering a low temp radiant system for an upcoming house we're planning. I'm dreaming of system that uses solar water for the first stage and a modcon for the second stage. I'd like to use the solar to fill in for the cooler water calls. The solar would probably be added later in life, but I'd like to prep for it in the design. The solar I envision is a drain back / big open tank design.
My though is to pipe the boiler and the solar as secondaries, and use a 2 stage controller to run the show. I think I want to use a submerged coil HX in the solar tank to inject into the primary. My great idea was to use a Taco 00-VV voltage following pump to pretend to be a modulating "boiler", still with me?
In my mind when a stage 1 call asked for more heat, the 00-VV would speed up and we'd inject more heat into the loop, perfect!. BUT, I think there might be a flaw in my logic, and that leads to my real question. When I speed up the pump, the solar secondary flow will increase, wouldn't that solar water temperature go DOWN because of the increased flow through the solar HX OR does the greater amount of cooler water injected into the primary do what I want it to do?? Fire away!
The less you know about something, the easier it seems to do it...
The less you know about something, the easier it seems to do. Therefore, if it seems easy, you don't know it.
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