1 / 13

Thermal Control System

Thermal Control System. The Three Mechanisms of Heat Transfer. Conduction - The transfer of heat through a solid Heat exchangers Cold plates Convection - Transfer through fluids both liquids and gasses Radiation - Transfer through vacuum or empty space Does not need a vacuum to radiate heat

alvis
Download Presentation

Thermal Control System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Thermal Control System

  2. The Three Mechanisms of Heat Transfer • Conduction - The transfer of heat through a solid • Heat exchangers • Cold plates • Convection - Transfer through fluids both liquids and gasses • Radiation - Transfer through vacuum or empty space • Does not need a vacuum to radiate heat • Radiators

  3. System Overview • Divided into internal and external loops, as well as per module • Divided into 35 and 62 degree loops • 35 degree loop cools all critical systems • 62 degree loop cools all non-essential systems • Maintains a comfortable living and working temperature for the station

  4. Internal TCS system • Cold plates, LCA, Pumps, Heat exchangers • All systems use water in case of leaking, as it is non toxic, and conducts heat very well.

  5. Cold Plates • Aluminum box conducts heat to water piping within • No power required, all flow is controlled by pump • Solenoid valve can bypass flow if necessary

  6. Internal Pump • Circulates water through the cold plates • Powered by EPS loads • Status, Flow rate, Pressure, Temperature, Voltage, Amperage

  7. Loop Crossover Assembly (LCA) • Allows both 35 and 62 degree loops to be connected within a given module • A single pump can only handle approximately 10 cold plates continuously at a time • Valves adjust flow to Heat exchangers

  8. Heat Exchangers • Identical internal and external systems • Intertwined spirals of piping allow heat to conduct between the internal water systems, and the external ammonium systems • Ammonium and water never mix as all heat is conducted through the walls of the piping • Sensors will alert crew to any leak of ammonium that would possibly contaminate the water system.

  9. External Thermal Control System • Heat exchanger, Pump Package Assembly, TRRJ, Radiator • Uses ammonium to prevent damage to pipes from extreme temperature differences • Ammonium has a lower freezing point than water, however in higher concentrations can prove toxic to the crew

  10. Pump Package Assembly (PPA) • Circulates ammonium through external systems • 5 PPAs share different heat exchangers in all modules, but are still divided into 35 and 62 degree loops • Powered by EPS loads

  11. Radiators / TRRJ • Thermal Radiator Rotation Joint • Acts as a large loop crossover for PPAs • Radiators allow heat to radiate into the space environment.

  12. Warning signs of a SOBE • Red indicator lights on the system wall • Increase in ambient temperature and or humidity • Ammonium smell (very obvious) • Contingency of another SOBE

  13. Things to check during a SOBE • Flow Rate • If no fluid is moving, then no heat is either • Loads for faulty pump/PPA • No power = No flow • Ammonium leaks (sensor info) • Toxic to Crew • Reduces flow in external system

More Related