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tacman7

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Reply with quote  #1 
So I have a tankless water heater like less than $100 Chine model, outside my kitchen window. The Winter sun shines on the wall between the sink and the heater.

So some sort of DIY thing that I could build.

I get hot water pretty quick but it takes a while, if that water were warming in the sun it would really be instant hot water.


Appreciate any suggestions

Rick H Parker

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Reply with quote  #2 
What kind of climate are you in?  If you don't need to worry about freezing, a Solar Bulk Heater might fit the bill. Cheap and easy to build.
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Rick H Parker
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tacman7

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Reply with quote  #3 
I'm in SoCal, no hard freezing.

I'm thinking about some sort of piping that would warm the pipe, no tank.

Maybe black pvc inside a glazed box or something.

Thanks

SolarInterested

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Reply with quote  #4 
For that I'd stick to copper piping. Even CPVC, which has a higher temperature rating than PVC, will deform at the temperatures inside a collector. That's at low water pressure too that you'd typically have in DYI hydronic panels. The normal residential water supply pressure is much higher.
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Both temperature rise and airflow are integral to comparing hot air collectors
SolarInterested

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Reply with quote  #5 
I believe Rick is suggesting a 'batch' type solar water heater. There are examples here:
http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm#Batch

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

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Reply with quote  #6 
Used 55 gallon food grade drums are cheap and on a good day you will have 55 gallons of preheated water.
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Rick H Parker
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stmbtwle

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Reply with quote  #7 
The food grade drums (blue plastic) will take up to about 160F (done that), but they won't take domestic water pressure. To use one for storage you'd need some kind of heat exchanger and now it's getting complicated.  An old water heater tank might be better for a batch heater.
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Willie, Tampa Bay
tacman7

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Reply with quote  #8 
I like the looks of that, gives me a lot to think about. Thanks

How is pex in a collector?


That link had a book to download but the file is corrupted.


I thought about bricks... some mass to get warm in a box with pipes running between them, would do some warming after the sun goes down, maybe.


SolarInterested

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Reply with quote  #9 
Quote:
Originally Posted by tacman7
... How is pex in a collector?

Not good
If a PEX collector is exposed to full sun with no water flowing through the collector to cool it, the PEX can be damaged beyond repair.
http://www.builditsolar.com/Experimental/PEXCollector/StagnationExample.htm

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

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Reply with quote  #10 
About the only thing that can withstand a stagnation event without damage is copper pipe or tube. Especially with pressure.

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