Hybrid Car – More Fun with Less Gas

Re: Solar water heating system value - Page 11

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Posted by Derek Broughton on March 9, 2006, 3:27 pm
David Hansen wrote:

I beg to differ.  I've made it quite clear that, imo, one can not get the
risks to an acceptable level for my climate.  It doesn't matter whether
such a situation is achievable.

I'm not even interested in "as low as reasonably practical".  "Practical",
from the engineers viewpoint, means there will be failures.

Snow's a smaller problem than cold.  In fact, we don't get much snow when it
gets really cold.

Posted by Solar Flare on March 10, 2006, 1:44 am
Yup. Lots of snow = no frost in the ground.

Snow's a smaller problem than cold.  In fact, we don't get much snow
when it

Posted by meow2222 on March 10, 2006, 2:52 am
 Derek Broughton wrote:

At no time have I stated that there is no need to worry about freezing.
Its quite obvious that a solarthermal system in Britain will need to be
safe in freezing conditions.

Lots of people round the country expose hosepipes to subzero temps day
in day out. Does this make them burst? No, because theyre not full of

by designing the system so it drains itself when the pump stops. As
long as its partly drained, all is well. The expansion of water on
freezing can be accomodated by a small percentage of air in the pipe.
With draindowns they are almost completely empty every time the pump
stops. Its how they work.

Its not because theyre not confident, but thats another story.


Posted by Doctor Drivel on March 10, 2006, 10:44 am

Mine is. It is on a reel on the wall.  It does freeze up, but the hose
expands so no problem.

Posted by Guy King on March 10, 2006, 11:42 am
 from meow2222@care2.com contains these words:

Even those that are don't burst 'cos they're sufficiently elastic.

Pay no attention to the man behind the curtain.

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