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Astronomy

Keeping a spacecraft cool

Keep the spacecraft cabin cool without air. Pump heat to a radiator, change its orientation and watch how sunlight competes with radiation into space.

Keeping a spacecraft cool — Actual application image
Actual application image

The model and its limits

Two thermal nodes, controlled thermal conductance and two-sided Stefan-Boltzmann radiation. Time runs 20 times faster. No convection, detailed pipe fluid dynamics, boiling or freezing model.

Equations used in the module
Equations
Q_flow = K p (T_c-T_r); Q_rad = 2 A epsilon sigma (T_r^4-T_space^4); C_c dT_c/dt = Q_load-Q_flow; C_r dT_r/dt = Q_flow+Q_solar-Q_rad

Related experiments

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Kepler problem — Actual application image

Physics / Astronomy

Kepler problem

Motion in a central gravity field: ellipses and Kepler's laws.

Retrograde motion — Actual application image

Physics / Astronomy

Retrograde motion

Ptolemy vs Copernicus: the same planets, two frames. Pin the Earth and epicycles appear by themselves - Mars walks backwards once per synodic period.

Seasons and obliquity — Actual application image

Astronomy / Earth

Seasons and obliquity

Why summer is warm: not because the Earth is closer to the Sun (it is closer in January) but because the axis leans, and a leaning hemisphere gets a higher Sun for longer. The Earth on its orbit with its axis fixed in space, lit from where the Sun is; an observer at any latitude with the day's Sun arc over the horizon; day length, noon altitude and daily insolation from the geometry, and the two hemispheres through the year.