A dangerous atmospheric devation: or Warm Administration on the Enormous Spaceship.


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A worldwide temperature alteration: or Thermal Management on the Big Spaceship ... Space Thermal Radiation issues. Shuttle get and transmit heat by blackbody ...
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Slide 1

A worldwide temperature alteration: or Thermal Management on the Big Spaceship Lecture #22 Space ideas

Slide 2

The Big Spaceship

Slide 3

Agenda Planetary temperatures Venus Earth Is Global Warming Real? What is driving it? A Simple Model Solutions

Slide 4

Blackbody Radiation Curve

Slide 5

Black Body Radiation Curve

Slide 6

Blackbody radiation If a body retains and transmits EM radiation superbly, it is known as a "blackbody" It then emanates power by the Stefan Boltzman Law W/m 2 = T 4 =emissivity, 1 for a dark body ,  >1 for genuine surfaces =5.76x 10 –8 Wm –2 K - 4 ( Stefan-Boltzmann steady)

Slide 7

Solar Spectrum

Slide 8

Space Thermal Radiation issues Spacecraft get and transmit heat by blackbody radiation They get radiation in the unmistakable ~ .5-micron on the grounds that the sun is more sultry than they are ( 10,000K) They emanate at much lower temperature ~300K crest radiation ~ 10microns

Slide 9

Kirkhoff\'s Law Energy adjust Poynting\'s hypothesis

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Radiant equilbrium Planetary brilliance Sunlight Infrared Energy touches base at obvious frequencies and is transmitted at infrared frequencies Gaussian surface

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Radiation Equibrium

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Heat Transport Thermal Conduction: Heat transport from hot to cool Heat streams downhill

Slide 13

Thermal Conduction Heat streams downhill

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Molecular Mean Free Path Mean free way =  A mean free way is the scale size on which atoms blend and transport vitality, force in a gas.

Slide 15

Molecular Thermal Transport Downward flux of enthalpy h= c p T Net flux  Upward flux of enthalpy h= c p T

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Photon Mean Free Path photon atom Photon Mean free way =  p A photon mean free way is the scale size on which photons of a given wavelength are assimilated and reradiated and transport vitality in a gas.

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Radiation Thermal Transport Downward flux of vitality E= c p (T\')T\'  p Net flux Upward flux of enthalpy E= c p (T)T

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Thermal Photon Diffusivity is brought down by expanded CO 2 !!

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Greenhouse Effect

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around 5×10^-22 m^2 per particle =5 x 10-18cm2 3 x1019 cm3 molecles x 300 x10-6 co2 = 9x10 15 cm3 1/(sig n) = 1/(5 x 10 - 18 cm2 x 9 x10 15 cm3 ) =1/(.45 x 10-1) = 20 cm mean free way at 15 microns

Slide 23

Reflected Sunlight Emitted Thermal

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Thermal Emission CO 2 emanation and ingestion band

Slide 25

25% expansion CO 2 levels in the air

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Oxygen levels

Slide 27

Icecaps are dissolving

Slide 28

UK government information

Slide 29

NOAA Satellites

Slide 30

Solar Radiance

Slide 32

Global Warming and Causes Global warming gives off an impression of being a truth, temperatures are rising –especially since 1980 Solar brilliance for the most recent decade seems level or diminishing Volcanic action , showing geothermal warming, seems level or diminishing Green House gasses are rising –appearing to connect with warming

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Conclusions Global warming seems, by all accounts, to be a reality Global warming shows up essentially determined by diminished infrared diffusivity in the environment because of expanded nursery gasses-different clarifications don\'t seem feasible Global warming, if unchecked, could have exceptionally negative outcomes for humankind

Slide 34

Solutions Humanity must move from fossil fills to atomic force and other non-nursery delivering types of vitality. France and Japan have changed over to 80% atomic Fission – it is both conceivable and down to earth Fusion power , cleaner and more secure than Fission , can supplant all fossil powers

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