Hybrid Car – More Fun with Less Gas

Is Efficiency dangerous ? - Page 16

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Posted by daestrom on October 31, 2005, 11:35 pm

But what happens if you use some hotwater during the day and the DT
controller starts up the pump again?  Sending 120-140F water up to a
collector that is 350+ would seem like a bit of a hazard.  I'm thinking it
would make some nasty noises when it flashes to steam and the steam
collapses in the return line.  Lots of hammering/shakes?


Posted by Solar Flare on November 1, 2005, 12:51 am
I have never heard of a solar installation without concentrators going that high
in temp.

Posted by Q on November 1, 2005, 10:42 pm

The 350-400 degree stagnation is a pretty extreme example, but AET says
they have observed it in Florida.  I tried stopping and restarting my
circulator pump at noon in the middle of the summer after an hour off
just to see what would happen.  You hear a little whoosh or sizzle, but
no hammering.  The ratio of collector mass to the volume of water running
through it doesn't come anywhere close to being able to generate any
system steam pressure.  Too much thermal mass in the rest of the system
and the latent heat of water is too big.

Gulf Coast Solar, Inc.

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