Author Topic: Blackbody Radiation and Thermal Control of Satelites.  (Read 152 times)

Offline Patrick

  • High Voltage Enthusiast
  • *
  • Posts: 19
  • Karma: +0/-0
    • View Profile
Blackbody Radiation and Thermal Control of Satelites.
« on: January 24, 2021, 03:57:45 AM »
With regards to satellites how is the Blackbody principle use to assist in thermal control ? I have know idea how to make sense of anything Ive read online. It seems like it emits radiation more at high temperature and less an cooling temperatures. If that's true is the surface area wisely chosen to not overheat or over cool a given system ?

what about silver with an emmisivity of 0.02, can that be used to prevent absorption in the first place ? ive looked here too :

https://technology.nasa.gov/patent/GSC-TOPS-40


Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 340
  • Karma: +8/-0
    • View Profile
Re: Blackbody Radiation and Thermal Control of Satelites.
« Reply #1 on: January 24, 2021, 10:18:13 PM »
It's about heat flows to approach radiative equilibrium with the environment,
which is very hot for a black surface in sunlight, and very cold for a black surface facing away from the sun.
More nuanced for white or mirror-like surfaces.  Traditionally tested in large "thermal vacuum chambers", that have LN2-cooled cold walls, sunlight-simulating illuminators, and doors bigger than the equipment under test.  Maybe superseded by numerical simulation in recent decades.

Decades ago, some satellite electronics bays were set up with Venetian blinds, opened and closed by bimetallic coil actuators.   Sounds particularly useful for LEO satellites that experience day and night in every orbital cycle.

High Voltage Forum

Re: Blackbody Radiation and Thermal Control of Satelites.
« Reply #1 on: January 24, 2021, 10:18:13 PM »

 


* Recent Topics and Posts

post Re: Large coil experimenting with long on-times.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
fh89
Today at 07:16:23 AM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 05:08:32 AM
post Re: Project: FreakyDRSSTC MK1
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 04:47:32 AM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 11:20:38 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
AeraCura_
March 03, 2021, 11:15:32 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
Twospoons
March 03, 2021, 10:30:40 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 10:03:26 PM
post Re: Need Help w/Build - Lightning Pulse Generator
[Laboratories, Equipment and Tools]
Mads Barnkob
March 03, 2021, 09:45:28 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
Twospoons
March 03, 2021, 09:44:17 PM
post First power on tests
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GrantV
March 03, 2021, 06:26:23 PM
post Re: Search for opinions concerning the use or test of a yunbao / Ebay drsstc skp
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GrantV
March 03, 2021, 05:54:58 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 03:13:30 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 01:18:22 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 12:25:52 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 12:24:40 PM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ChrisBlis
March 03, 2021, 10:43:20 AM
post Re: Search for opinions concerning the use or test of a yunbao / Ebay drsstc skp
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GrantV
March 03, 2021, 09:05:02 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
davekni
March 03, 2021, 05:53:33 AM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
profdc9
March 03, 2021, 04:22:01 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
petespaco
March 03, 2021, 04:00:14 AM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
davekni
March 03, 2021, 01:21:15 AM
post Re: Just a noob with some HV concerns...
[Beginners]
AstRii
March 03, 2021, 12:36:05 AM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 03, 2021, 12:35:57 AM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
davekni
March 02, 2021, 11:40:16 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 02, 2021, 11:29:28 PM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 02, 2021, 10:48:04 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
davekni
March 02, 2021, 10:33:13 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 02, 2021, 10:20:22 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
davekni
March 02, 2021, 10:18:05 PM
post Re: Search for opinions concerning the use or test of a yunbao / Ebay drsstc skp
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 02, 2021, 09:38:45 PM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
March 02, 2021, 08:54:33 PM
post Re: WTS [EU] Vici DM4070 LCR meter with SMD tweezers
[Sell / Buy / Trade]
Da_Stier
March 02, 2021, 08:53:31 PM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
profdc9
March 02, 2021, 05:04:44 PM
post Re: Search for opinions concerning the use or test of a yunbao / Ebay drsstc skp
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GrantV
March 02, 2021, 03:16:25 PM
post Re: WTS [EU] Vici DM4070 LCR meter with SMD tweezers
[Sell / Buy / Trade]
AstRii
March 02, 2021, 09:41:31 AM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ChrisBlis
March 02, 2021, 08:26:30 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
hightemp1
March 02, 2021, 07:05:01 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
davekni
March 02, 2021, 06:22:52 AM
post Re: Interesting RF air-core transformer construction
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
March 02, 2021, 05:24:46 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
hightemp1
March 02, 2021, 05:21:16 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
petespaco
March 02, 2021, 04:37:50 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
hightemp1
March 02, 2021, 01:26:36 AM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 01, 2021, 11:07:01 PM
post Re: Very old flyback
[Transformer (Ferrite Core)]
Alberto
March 01, 2021, 11:04:06 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 01, 2021, 09:45:59 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
davekni
March 01, 2021, 09:30:44 PM
post Re: DRSSTC Performs only with 1cm Arcs - Troubleshooting
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ChrisBlis
March 01, 2021, 09:27:38 PM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
March 01, 2021, 09:05:02 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
dreamth
March 01, 2021, 08:22:33 PM
post Re: Baxandall converter strange output
[Transformer (Ferrite Core)]
davekni
March 01, 2021, 08:16:46 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal