View Single Post
  #10   Report Post  
Old 06-10-2005, 04:13 PM
Ted Byers
 
Posts: n/a
Default


Now comes the subject of the color black in shade net trapping heat
efficiently more than the green one. Any takers?

If attention is focussed solely on thermodynamics, the answer is obvious.
Instead of answering directly, I'll put the question back to you in slightly
different terms.

NB.: A flat black surface is absorbing light energy in all frequencies in
the visible spectrum.

NB.: A green surface is absorbing all frequencies in the visible spectrum
EXCEPT for green. Green is reflected which is why it appears green.

Which do you suppose is absorbing more energy, assuming both are subject to
the same intensity of white light?

Which will reradiate more energy out of the greenhouse as infrared
radiation?

Which will reradiate more energy into the greenhouse as infrared radiation?

Cheers,

Ted

--
R.E. (Ted) Byers, Ph.D., Ed.D.
R & D Decision Support Solutions
http://www.randddecisionsupportsolutions.com/
Healthy Living Through Informed Decision Making