Seems like from a thermodynamics question you can first think of having
two identical systems with identical energy inputs. Unless one of the
systems is capable of storing energy in some form differently from the
other the equilibrium temperatures should be the same.
Now CFBs emit more of the their input energy as light which since the
containers are transparent (presumably to the same light that's emitted,
visible, UV, infrared) it will escape more easily. Incandescents
generate a lot of heat for the same energy input which may not escape as
easily as the light energy. It will depend on the thermal conductivity
of the container's materials etc. If the CFB were 100% efficient all
it's energy will leave immediately in a container that is 100 %
transparent to its 'light' and show no temperature increase. If the
incandescent's heat is transmitted as infrared energy at 100% efficiency
along with any light then its temperature will show no increase either.
So the answer may have more to do with the properties of the containers
than the properties of the lights. Practically, I'd expect A to warm up
more than B because B's light energy will escape more easily with
materials we are familiar with.
If both containers are opaque to all light (UV, visible and IR) and have
the same thermal conductivity properties we are back to the first paragraph.
2c
Robert C
On 2/14/17 8:01 AM, Gary Schiltz wrote:
Since there are some non-naïve, i.e. professional physicists, as well
as just gererally smart people in FRIAM, I pose the following fun
question. Given: two transparent, sealed containers filled with air -
one contains an incandescent light bulb A that consumes 100 watts of
energy; the other container contains a fluorescent light bulb B that
also *consumes* 100 watts of energy. Since B is of a more efficient
design, it will produce more light than A. Assuming the same color
temperature light is produced by A and B, and ignoring any feedback
effects of rising temperatures inside the respective containers, will
the temperatures inside the containers reach the same
temperature? Naïve physicist G (me) thinks that since more light is
escaping from the container containing B, that its temperature will
rise less. G also thinks that if the containers are opaque, that the
temperatures will rise by the same amount. But G is besieged with
doubts. Please help G.
============================================================
FRIAM Applied Complexity Group listserv
Meets Fridays 9a-11:30 at cafe at St. John's College
to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com
FRIAM-COMIC http://friam-comic.blogspot.com/ by Dr. Strangelove
--
Cirrillian
Web Design & Development
Santa Fe, NM
http://cirrillian.com
281-989-6272 (cell)
Member Design Corps of Santa Fe
============================================================
FRIAM Applied Complexity Group listserv
Meets Fridays 9a-11:30 at cafe at St. John's College
to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com
FRIAM-COMIC http://friam-comic.blogspot.com/ by Dr. Strangelove
