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paulstef

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Reply with quote  #1 
I discovered there is a research facility of our provincial power utility only a few miles from where I live.
On their site I found THIS: http://www.hydroquebec.com/innovation/en/pdf/2010G080-29A-Thermelect.pdf

It says it holds 15 times more heat at 100C than water. 

It doesn't say anything about phase change. What material has 15 times the volumetric heat capacity of water?

If I understand this article correctly it says a given volume of these ceramic bricks store 15 times more heat than the same volume of water at the same temperature.

paulstef

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Actually, I think it means " not at the same temperature".

The bricks can be charged up to 900C and THEN it may have more heat stored than water at 100C. Must be it...
stmbtwle

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Reply with quote  #3 
Problem is, where are you going to get those temperatures in DIY solar?
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Garage_Hermit

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Reply with quote  #4 
Sounds like they are using super-dense ceramics...

http://www.galaxyrefractories.com/products/view/Fire_Crete_Super_70_Alumina_Castable

to answer the question, for a DIY solar applicaiton, I think we can forget this one !

HOWEVER, "normal" ceramic tile is about twice the density of concrete, so could make a theoretical "approximate alternative" to water, but it would be so costly as to be unfeasible...

I'd stay with SLATE [biggrin]

G_H

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paulstef

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Reply with quote  #5 
Yes, we can't possibly get 900C with normal DIY solar. They charge it in off-peak hours with electricity...
SolarInterested

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Reply with quote  #6 
While not used for space heating this DIY cooker can get up in that temperature range

http://www.builditsolar.com/Projects/Cooking/StoredHeat/StoredHeat.htm

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Gray Edwards

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Reply with quote  #7 
This does bring up an interesting thought.  Perhaps you could place something in the water storage tank of greater mass and heat retention characteristics than water that would allow more heat to be stored in the same volume.
Garage_Hermit

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Reply with quote  #8 
Yes, but how much would it cost ?

For example, floor polish or cooking oil or paraffin wax would all work really well, but they are FAR far more expensive than water.

You would rapidly get to the point of diminishing returns, meaning it would be cheaper to stay with your normal heating source (gas, oil, electric etc.).

G_H

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Gray Edwards

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Reply with quote  #9 
Hermit, I was thinking more along the lines of keeping water in the tank (and used for circulating through the solar heater), but putting some sort of "bricks" in the tank.  Said bricks would be something that would store more heat than the equivalent volume of water.
solardan1959

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Reply with quote  #10 
Gray,
   I don't think the Bricks will improve storage and actually will store less heat than the equivalent volume of water.  Thought if they were in the water a long time and all the porous holes filled up.  Then it may be equal but why make it more complicated unless you just want to save water?

Dan
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