Thermal SubsystemPeer Review

7-9-3

Objective:

To maintain all components of the space craft within their specific temperature range

Method

Model Empty Spacecraft for entire orbit:

Assumptions:Assumptions:

•ISS Orbit

•Thermal Properties

•Structure

Results:Results:

•Heat gain from Radiation

•Heat reflected within satellite

Inside-the-Box Modeling

Used to monitor temperatures at specific locations during orbit. This will allow for us to troubleshoot during the mission when components are not acting properly.

Thermistors

• Sensor is glued to surface of interest, where it creates a specific resistance in response to temperature measurement.

• Approximately, 50 thermistors will be required at $3-$6 each.

Inside-the-Box Modeling

• IsolationSome sensitive electrical components will need to be isolated from the radiative/conductive environment. We can do this thru MLI blankets.

• Heat Reservoirs

Components which are exposed to alternating hot and cold modes, will need to be in contact with heat reservoirs which will both gather and supply heat when needed.

Temperature Control

• Radiator:

The radiator rejects excess heat into space.

• Placement:

The best position for the radiator is the earth facing side of the satellite. This should not affect the cameras, and is standard practice.

Inside-the-Box Modeling

Heat Expulsion

What’s Next?

• Thermal Model

Upon reporting specifications of materials and equipment, as well as their modes of operation, our model can be expanded to increase accuracy.

• Placement of Thermistors will result from the reporting of these specifications, so we can identify points of interest for temperature measurement.

References

• http://www.angels-crossing.com/gifts.html• gore.ocean.washington.edu/.../

Students/Crone/therm.htm • http://www.resonancepub.com/images/Image20.gif• www.facesofyve.com/business/ index.shtml