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Re: [Phys-l] paint your roof?



No, I remember my father talking about it in the early 60s? He followed the
news including science news. So on this one you are on your own to find the
reports. It would probably have been reported in the NY Times science
section. The NY Times science section is a good source and it probably has
as many substantive articles as most of the monthly science magazines.
Besides which you can access it for free. But older articles may require $$
for full access. Most NY Times articles in the 1800s and very early 1900s
are now accessible for free. It is goldmine of information, especially if
you are a genealogist.

John M. Clement
Houston, TX


Interesting! Do you happen to know which Canadian school this is?

Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
Heating is at 20% and the white roofs would increase (to some extent)
heating demand.

White roofs would probably actually decrease heating demand. The most
demand for heating is at night in northerly climates. A white roof
reduces
radiative losses during the long winter nights. So the balance between
daytime loss in radiative heating and the nighttime gain in radiative
loss
would probably favor the long nights. Actually most of the heat loss in
northern climates is probably through the windows and doors, so it would
be
a small effect at best.

Actually if you can reduce heat loss enough in a northerly climate, the
heat
gain due to appliances, lighting, and human habitation can keep the house
warm. There is a school in Canada where they use the body heat from the
children to keep it warm. Rather than venting the heat during lunch they
pump it to the classrooms to maintain the temperature.

John M. Clement
Houston, TX