Things going on inside PAR Automotive Tungsten-Halogen Lamps.
Properties of Tungsten at 500 2,000 K :
Radiated power density, 97.1 240,000 watts/m^2
Resistivity, 1.056e-7 ohm-meters 5.667e-7 ohm-meters
Electron emission, nil 10.0 amperes/meter^2
Electron Affinity of Neutral Bromine
Fred wrote:
I pointed a 250 watt heat lamp at the sun coming through a double-pane window
with a DVM hooked to the terminals.
Surprisingly after a couple of minutes there wasn't any readable voltage,
but there was a couple of microamps of current flow which dropped off as the
filament
Michael Foster wrote:
Fortunately, the whole series of attempts took no more than ten minutes, since I had everything close at hand. Your result from the heat lamp, as those filaments are fairly large, might have been a thermocouple effect from unequal heating. What do you think?
I think
I posted earlier:
Too bad there isn't a way to connect to the aluminum reflector coating to
see if there is a Thermionic Converter effect going on. This is why I want
to see if the W-Halogen flood lamps PAR 38 120 watt-120 volt do better, even though this
bulb size (4.75 inch dia) can
Fred wrote:
Astute calculations show that dissociation
of an Iodine molecule at the filament, with
uptake and subsequent discharge of an
electron attached to an Iodine atom
at the bulb (internal) reflector coating could
yield up to 20 amperes at ~ 0.5 volts from
the 12 watts of solar
Michael Foster wrote:
Fred wrote:
Astute calculations show that dissociation
of an Iodine molecule at the filament, with
uptake and subsequent discharge of an
electron attached to an Iodine atom
at the bulb (internal) reflector coating could
yield up to 20 amperes at ~ 0.5 volts
Make that 4.0 microamps at 200 microvolts as the filament
went from 5.2 ohms cold to ~ 6.5 ohms facing the sun.
FJS
- Original Message -
From: Frederick Sparber
To: vortex-l
Sent: 10/5/05 10:20:10 AM
Subject: Re: Sealed Beam Tungsten-Halogen Headlamp OU Solar Collectors
The 1.56 eV Iodine-Iodine and 2.00 eV Bromine-Bromine bond and their bond to
evaporated Tungsten atoms is broken on the solar heated filament.
A bank of these mounted on a panel rigged for solar tracking could be an OU device.
Some lamps have built-in Fresnel lenses.
Tungsten- External Metal
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