Posted by News on June 7, 2008, 11:48 am
Maybe, placing 4 inch plastic sewer pipes filled with water with the ends
capped off would be cheaper and far more effective. What is it water holds
3 times more heat than concrete? Place these pipes in the middle of the
concrete block. Would water seep out of these eventually?
Posted by daestrom on June 8, 2008, 12:04 am
Why not simple reinforcing bar? Widely available and relatively cheap. Not
prone to leaks (although rusting can cause cracking of the cement).
Posted by News on June 8, 2008, 7:23 am
The frame for the concrete block looks like it was built of thin rebar.
Adding more may not such a difficult task.
Posted by Kitep on June 9, 2008, 1:21 am
I think the idea is that water-filled coke bottles have a higher heat
capacity than concrete. Someone pointed out that eventually the coke
bottles will lose the water. Then the conversation shifted to water filled
pipes embedded in the concrete, with the ends projecting out of the block,
presumbably so you could refill if the water got out. I assume rebar has a
lower heat capacity than even concrete, never mind water.
Posted by Jeff on June 9, 2008, 1:37 am
Why do we even care about the heat capacity of the concrete? This is
a collector, not a storage unit.