Dr Ben Discusses Glycol Solar Hot Water Systems Part 1 of 3

[@user-vq4mt4zd4e]

great content thanks

[@hansstofberg43]

Hi, you said glycol has to be pressurised . But why ? According to google, glycol has a higher boiling point than water and of course the pressurised system brings the boiling point even higher. Its good too because I was reading 127 Celsius at one point .

[@convectioncoil]

Super informative video for the newbies! I really like the logical progression and reason for adding each componant. Are you related to the inventor of Gravely walk behind tractors (1917, I guess that would make him your great grand father??)?

[@jamieclay6026]

Hi. I have a simple glycol solar collector. Other than drain off points either side of heat exchanger, there is no obvious charge point. I plan to add one, a fill loop or gated T. My question is, should the planned charge point be above or below the circulating pump? Thanks

[@VictorHernandez-iu7lr]

Wich one is better system, the one with glycol or the drain back system in a climate of 70 degre all year round

[@TruePrinciples]

Dr. Gravely, I was wondering why I would need a pump in a glycol system if a thermo-siphon is created? I'm looking for as "energy-free" a design as possible for potential off-grid applications. Thanks in advance.

[@brub5174]

Did you found answers?

[@กิตติพลขาวงาม]

กิตติพล ขาวงาม

[@bengravely6266]

@ TruePrinciples. You can do a thermosyphon system if the tank is above the collectors. The heat generator must be below the storage. For a glycol type system that is full of fluid at night when it is cold, you get cold water falling down to the storage tank, or reverse thermosyphon. That is why you must block the circulation.

[@bengravely6266]

Dr. Ben has published a new book covering his 40 years of experience in solar design, manufacturing, and installation. "Solar Engineering of Drainback Systems” is for engineers, architects, contractors, and DIYers. For more information, go to the [solarhotwater-systems] website.

[@bengravely6266]

@convectioncoil. Ben Franklin Gravely was my great uncle. I was (almost) named for him. We have different middle names.