Hybrid Car – More Fun with Less Gas

options for house heating by reflected light

register ::  Login Password  :: Lost Password?
Posted by mn_mn on November 10, 2008, 8:22 pm

Imagine house with long side facing south, all walls transparent,
black floor and black water tanks on northern wall, how to direct most
sunlight inside for house heating with least amount of effort or
moving parts?

1.  PATIO.  Adding a south facing white or mirrored patio doubles the
sunlight being directed inside I think.  With the sun so low you need
a long patio to get much effect.

2.  DETACHED ROOF.  Adding a flat very slight south leaning roof also
boosts sunlight hitting the house.

3.  PARABOLA FENCING.  Circular or parabolic shaped fencing open to
south can boost sunlight.

4.  HELIOSTATS.  Heliostats can be used less noticeably, putting some
far away on north side, with their tracking ability overcoming need to
be close to house to keep house near focus.  Not sure whether their is
practical limit to how far heliostats can be.

5.  BAND SHELL.  Maybe maximum non-moving structure is band-shell like
half parabola?

Maybe curve some of the normally flat reflectors so that midday they
hit middle of house and even away from noon their focus still is on

7.  STILTS TO OPEN UP UNDERSIDE OF HOUSE.  If one puts house on stilts
you open up the underside of the house, maybe also use a north facing
mirror to help bounce light, so then you can use a longer patio to
bounce more light onto the structure -  double this double the area
open to "direct" sunlight?

8.  LONG SIDE OF HOUSE FACING EAST-WEST.  I wonder if better to put
the house so long side is facing east-west, for example this would let
parabola fencing keep some part of the house at the moving focus the
moving sun creates.

Has anyone researched these ideas, of with simple white or mylared
plywood panels boosting the light hitting a house????????????

Can light be doubled, tripled inside house without damaging eyes or
skin of inhabitants?


Posted by mn_mn on November 10, 2008, 9:05 pm

To comment on my post about whether reflected sunlight would be too
much for inhabitants of a house, if the floor and back wall are black,
and all else is clear window, then "brightness" your eye would catch
by would be minimal.  For example your eyes only would see the image
of the sun in the mirror-patio and the image of the sun on the
underside of the detached roof and of course the normal image of the
sun in the sky, and like normal when walking under the sun you just
look away or don't look up or to south to not see this direct image of
the sun whether direct or reflected.  Using white surface rather than
mirrors might help in diffusing the sunlight.  ???

To easily deduce the doubling or tripling of sunlight I think one can
image you are sun looking at the house and then counting the number of
images of the house you see.  If you see for example  1) the house, 2)
the stretched image of the house in the mirror-patio, and 3) stretched
image of the house in the underside of the detached roof and 4) half
the house in various north side mirrored fence panels, this adds up to
3.5 times normal sunlight hitting the house.


Posted by Morris Dovey on November 11, 2008, 12:47 am
 mn_mn wrote:

Keep in mind that the human eye is structured to handle considerably
less than one sun.

Exposure to a full sun (what you get when you look directly at the sun)
or more can result in blindness.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by mn_mn on November 11, 2008, 6:58 pm

People have lived under the Sun since time began without many going
blind, though it is a danger.

Snow blindness I read is from the UV rays, which any reflector could
filter out.

After thinking I do think you see round images of the sun, not
distorted images, even looking at the mirror-patio or underside of
roof, ,, ,,, so I hope one's instincts would still be triggered by any
of the sun-images and you wouldn't look at any of the sun-orbs you

Overall, I admit looking at white paper in sunlight can be annoying,
so I do wonder if at triple-sun strength the light is unbearable and
the need to avoid any white items wrecks this idea in its simplest
form (in more complicated form you just put up black thin walls an
inch inside the clear walls and you live in a dark solar oven with
just a few very bright interior windows).


Posted by nicksanspam on November 11, 2008, 11:31 am

... over a garage with a transparent south wall and a massy ceiling? :-)


This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread