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gregkn73

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Reply with quote  #11 
As much as I enjoy the efficiency and trouble free operation of my sunspace, I can not say the same for Aretha :-( it is simply not good for a close loop heating water system, because it can not sustain the increased pressure! I am keeping it at 0,2 bar instead of 1, because I have many leaks .....

The radiator fan didn't hold the T! I am now working it with 6*8mm computer fan's, hoping to withstand the T.

As far efficiency, it is far inferior to sunspace.

All in al,l if I have one more trouble I will quit :-( already I am thinking alternatives to how to use theexisting collector for heating water.

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stmbtwle

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Reply with quote  #12 
Good to know!

Was your fan on the cool or the hot side of the heat exchanger?  I've always put mine on the cool side, and I think Paolo did too.  Putting the plastic fan on the hot side I think would be asking for trouble.

Though looking at the photo, it looks like the motor overheated. Maybe it just wasn't up to running continuously. Computer fans might do better, but I don't really know.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gregkn73

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Posts: 49
Reply with quote  #13 
Quote:
Originally Posted by stmbtwle
Good to know!

Was your fan on the cool or the hot side of the heat exchanger?  I've always put mine on the cool side, and I think Paolo did too.  Putting the plastic fan on the hot side I think would be asking for trouble.

Though looking at the photo, it looks like the motor overheated. Maybe it just wasn't up to running continuously. Computer fans might do better, but I don't really know.


It was on the hot side, but as you said , the cause probably was ,that it was running 10-11h continuously the first days of October, when it failed. If the computers fans fail, I am conidering , replace Aretha with a spiral of irrigation pipes.
stmbtwle

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Reply with quote  #14 
That would be simpler, though I understand irrigation pipes will melt if the collector stagnates.  "PEX" pipe would probably be better, see below.

https://simplysolar.supporttopics.com/post/show_single_post?pid=1306024302&postcount=7&forum=269864

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gregkn73

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Posts: 49
Reply with quote  #15 
Quote:
Originally Posted by stmbtwle
That would be simpler, though I understand irrigation pipes will melt if the collector stagnates.  "PEX" pipe would probably be better, see below.

https://simplysolar.supporttopics.com/post/show_single_post?pid=1306024302&postcount=7&forum=269864


PEX pipes would need aluminium foil covering, which I have to bend it, etc.coil of Black irrigation pipes is much easier to make it, I thing it will be more efficient, simply because of the dense coil, and during summer by shading the collector, T was max 58°C. During winter if for any reason stagnation occur.....I will risk it:-)
gregkn73

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Posts: 49
Reply with quote  #16 
Quote:
Originally Posted by stmbtwle
That would be simpler, though I understand irrigation pipes will melt if the collector stagnates.  "PEX" pipe would probably be better, see below.

https://simplysolar.supporttopics.com/post/show_single_post?pid=1306024302&postcount=7&forum=269864


Willie i know it is not the Wright place to ask, but do you know why they use with PEX pipes such thick aluminium foil , which is difficult to bend? Isn't a thinner one , even like the staff used at our kitchen's, going to protect PEX pipes from UV radiation?
stmbtwle

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Reply with quote  #17 
Greg you'd really have to ask one of those who works with PEX, I don't. However it's my understanding that the fins are there not to protect the PEX but to absorb the sunlight and transmit the heat to the PEX. the PEX coils are several inches apart, and the aluminum fins capture the heat from the spaces in between. The thicker fins supposedly transfer the heat better than, say, aluminum foil.

On bending the aluminum and PEX: I've discovered that heating aluminum (such as a pop can) with a propane torch and letting it cool will soften it, making it easier to bend.
https://process.arts.ac.uk/content/annealing-softening-aluminium-plate/index.html

The PEX like most plastics can be softened with a heat gun, but it kinks more easily too.


That's why I've always liked the ARETHA concept, for a hydronic collector they're easy to build. However the fan has always been a concern for me. Computer fans seem to work well but most of them don't move a lot of air, and auto fans aren't really intended for continuous duty. If one could find a way to mount the motor outside the collector and drive a metal fan, it might be better.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gregkn73

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Posts: 49
Reply with quote  #18 
Since Last week, that my Aretha is working with Computers fan,
6*8mm, 28cfm each ,it's way less efficient, than when was working with, it's car fan. It is consuming a lot less electricity, but also useful BTU production is low.
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