Pumped Glycol vs Drainback Revisited

Bob “Hot Rod” Rohr, Caleffi training and education manager, takes a fresh look at solar thermal systems, revisiting the latest in step-by-step system design so that the audience can be certain of a top-notch system. Rohr will uncover sweet-spot jobs and opportunities, as well as refresh the audience with the latest incentive programs.

[@SAUCEestudio]

Great info here! Thanks for the effort. Cheers!

[@CaleffiHydronicSolutions]

We thank you for your positive comment! Keep on following us on KZbin.

[@hvacdesignsolutions]

Guys, your product range is incredible. Where are your modules and components manufactured?

[@CaleffiHydronicSolutions]

Thank you! Our product is manufactured in Italy.

[@leahcim38]

I was able to cop an entire thermal solar system with 4 panels. 50gal indirect tank (battery) even a high end taco stainless steel pump ALL from craigslist. It's the most efficient system available. 100k BTU for 220 watts.

[@CaleffiHydronicSolutions]

Very innovative!

[@leahcim38]

Do you recommend parallel piping the collectors? I have 4 collectors flat plate piped all parallel, and when the pump turns on the temp just rapidly drops I am using a 009 stainless and I think it's a little too much velocity. It's the same weather I drainback or have it filled. My sensor is inside the panel but on the header pipe. Also my 009 stainless pump is a "cartridge" circ and I was wondering if I could swap like a 007 cartridge in because it definitely works better with a slightly lower flow rate.

[@leahcim38]

Update: I have a feature on my pump control so that when the sensor hits X **F to prevent overheating. Now the pump runs more constantly and I'm getting a good 190* * to my 50gal thermal Cell. Ideally I'll eventually upgrade maybe to a bigger tank. Or add one hmmm... now I'll drain it back to the drainback point and see how it performs. What I've found with solar is that I have to experiment to see what works best and the simpler the better. I used thermal traps instead of check valves.

[@CaleffiHydronicSolutions]

Great, happy to hear you have this working well