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Why there is no rooftop parabolic trough - Page 2

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Posted by azuredu on January 6, 2009, 8:48 pm
 


Hmmm... I don't think the authorities will allow you to put flat
panels onto the roofs without solid ancres.

Its true that the parabolic collectors are little bit higher, but not
much: about 20cm above the tiles. The smaller the collectors, the
lower the height. But a too small collector will present other
difficulties.

Posted by RF on January 7, 2009, 4:27 am
 
azuredu wrote:

Would they know anything about it? I doubt if they
have a person walking neighborhoods looking at
roofs. However, your nosy neighbors might just
report it.


It would depend on the location of the house. If
on a hill top, 20cms could
result in a strong uplift force in a gale. If in
trees or in a valley, there shouldn't
be much of a problem.

Posted by azuredu on January 7, 2009, 5:24 am
 

The real problem is when the panels are lifted by strong wind then
drop and wound somebody passing by. Then people will find that you are
not conform and will sue you.

Posted by RF on January 8, 2009, 5:28 am
 azuredu wrote:

That was the initial point I made. You need to
clamp the parabolic structure down and connect it
to the roof structure with strong bolts. It can be
done. Probably would be best to have a chat with a
civil engineer about the location, the unit and
the bolting.
Good luck!

Posted by Steve O'Hara-Smith on January 9, 2009, 9:34 am
 On Tue, 6 Jan 2009 04:34:17 -0800 (PST)


    For water perhaps - for air heaters it is far from useless.


    However in direct sunlight flat panels and concentrators collect
similar amounts of energy, while under cloudy conditions concentrators
collect no energy and flat panels collect a little. Therefore on average
flat panels collect more energy.

    The concentrator comes into it's own when you want high
temperatures.


    Perhaps but it hasn't been done.

    Like most other "which is best" arguments the answer is "it depends
on what you are trying to do". Flat plates, evacuated tubes, troughs and
dishes all have their strengths and weaknesses.

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