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gregkn73

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Posts: 40
Reply with quote  #1 
I have search but didn't find the answer. In a very easy and cheap to construct hydronic system, why no use instead of cpvc pipes the simple black pipes used for drip irrigation. I think it is polyethylene tubing and according to that page http://www.engineeringtoolbox.com/plastic-pipes-operating-pressure-d_1621.html the max operating temperature without pressure of polyethylene pipes are similar to cpvc, 82°C, and you can make the joints without even gluing! So in drain back vertical collector why not use them instead of cpvc, for space heating?

stmbtwle

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Reply with quote  #2 
As long as there's no pressure involved you could, and it lends itself to 'coil' collectors. Tori I think made his hot tub heater of irrigation tubing and I'm thinking of building one.

Not sure how well it would take stagnation though, I've had poor results with cpvc in a closed collector.

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Willie, Tampa Bay
gregkn73

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Reply with quote  #3 
Well in stagnation event will be empty, and while operating, the pressure with a small circulating pump, will be minimal, so the max operational T, wiill be closer to 82 than 38°C, am I wrong?
PS I search for a topic with author Tori in this section but didn't find anything. Can you give .e a link to his topic of hot tube heater?
stmbtwle

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Reply with quote  #4 
Thread is here: 
https://simplysolar.supporttopics.com/post/new-guy-introduction-and-need-some-advise-8447973?highlight=hot+tub&trail=10

Even when empty the collector still gets hot, more so without the water (coolant) going through it, and I know for a fact that a stagnated collector in the summer sun can reach boiling (100C). At least in Florida; been there.

You could however use a diversion loop to keep it cool, I installed one on my ARETHA hot tub collector.

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Willie, Tampa Bay
gregkn73

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Reply with quote  #5 
I intend to use it only in winter for space heating. During summer I will cover it or unplugged it and move it in ashade. So I don't know if stagnation during winter could be such a problem...thanks for the link, a lot of useful info and ideas also there.
stmbtwle

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Reply with quote  #6 
As long as it's covered. Just turning them off doesn't do it.
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Willie, Tampa Bay
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