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jamieF

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Reply with quote  #431 
lots of bubblewrap goes by my desk daily.  I'll snag some and see if it helps

Rick H Parker

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Reply with quote  #432 
Anything solid, porous or liquid that comes in contact with a water molecule in vapor-phase, will steal energy from the water molecules causing it to re-enter the liquid phase.
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Rick H Parker
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Electronics Engineering Technologist
jamieF

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Reply with quote  #433 
the saran wrap is working great. I've lost maybe 1/4" since adding it and the tank was over 40C for most of that time.

Today the tank hit 49.13C and the exchanger in hit 51.25C.  

We're entering a heatwave so I'll need to get the differential controller working as I wouldn't be shocked to see the tank hit 55 or even hotter in the next few days if I don't stagnate the collector. 
stmbtwle

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Reply with quote  #434 
Glad to hear it's working. It made me think a piece of insulation (bubblewrap?) on top of the saran wrap might help reduce heat loss.

Did you ever get/install the twinwall on the collector?

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Willie, Tampa Bay
jamieF

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Reply with quote  #435 
The entire expansion bucket needs thought about.  Heat loss from it right now is pretty bad and it's 30C outside come winter it will only get worse.     bubble wrap won't do much.
stmbtwle

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Reply with quote  #436 
That's true, I was thinking in the short term. Suppose you got the smallest bucket you could, put it inside a larger bucket, and fill the gap with foam insulation? Then insulate the lid with polyiso.

You could put the whole show (pump and all) inside a plastic storage box and pack with fiberglass, foam peanuts, or whatever you like.

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Willie, Tampa Bay
SolarInterested

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Reply with quote  #437 
or just use an insulated container like a picnic cooler.
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Both temperature rise and airflow are integral to comparing hot air collectors
jamieF

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Reply with quote  #438 
I'm really busy with everything other than this project  but a quick update.  Tank is at 50C and has been for over a week.   No sign of issues with the tank liner and the saran wrap seems to have stopped the vast majority of the water loss.

The heat shrink glazing on the collector let go on one side in some decent winds while being insanely hot outside.  It may be an OK temporary solution if you need only one sheet but the seam is where the wind got in and torn it to pieces.
SolarInterested

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Reply with quote  #439 
Quote:
Originally Posted by jamieF
...   No sign of issues with the tank liner and the saran wrap seems to have stopped the vast majority of the water loss.
That's really interesting that the regular construction poly has worked as long and as well as it has as a tank liner.

Saw the articles below and thought of your saran wrap cover:
Need to Cover Your Sous Vide Container? Try Sous Vide Ping Pong Balls (link)

Why You Should Add Ping-Pong Balls to Your Sous Vide Bath (link)

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Both temperature rise and airflow are integral to comparing hot air collectors
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