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HEAT PIPES FOR CONTROL

HEAT PIPES FOR CONTROL. CAN THEY BE USED IN CHEMICAL REACTORS ETC?. Thermosyphon & Heat Pipe. Conventional heat pipe schematic. (1) HP case, (2) porous wick, (3) vapour channel, (4) vapour, and (5) liquid. Thermosyphon (Gravity-assisted liquid transport). A Little Bit of History.

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HEAT PIPES FOR CONTROL

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  1. HEAT PIPES FOR CONTROL CAN THEY BE USED IN CHEMICAL REACTORS ETC?

  2. Thermosyphon & Heat Pipe Conventional heat pipe schematic. (1) HP case, (2) porous wick, (3) vapour channel, (4) vapour, and (5) liquid. Thermosyphon (Gravity-assisted liquid transport)

  3. A Little Bit of History Perkins Tubes used to transfer heat from a hot air stream to a cold one – gas-gas heat recovery. The Perkins tube is a thermosyphon – relies on gravity for liquid return

  4. The Perkins Oven – use coal to bake bread without getting soot on the dough!

  5. Closer to chemical Engineering – safety first!

  6. The current version of the Perkins Heat Exchanger

  7. Heat Pipe Working Fluids Fluids can cover temperature ranges appropriate to most reactors. Liquid metals used – eg sodium.

  8. Comparison of fluid performance Merit number compares relative heat transport capability of different working fluids. Strong function of latent heat, surface tension, viscosity

  9. Limitation to heat transport are several Capillary limit affected by orientation of heat pipe & wick design. The wick is a passive pump. Sonic limit occurs when fluid density high (eg at low T)

  10. Types of Heat Pipe

  11. Applications as a Function of Heat Pipe Features

  12. Isothermalisation Isothermalisation – or evening out of temperatures, is an inherent feature that may benefit reactors

  13. Variable Conductance HP in a Reactor (Nuclear)

  14. Benefits in Chemical Reactors Catalysts have been put on heat pipes, with surface reactions. The heat pipe is in ideal way of heat removal/input to the catalyst thereon.

  15. More possible benefits in Reactors

  16. Chinese Chemical Heat Pipe Reactor

  17. VCHP Concepts – 1 Passive Control

  18. VCHP – Passive Feedback Control

  19. VCHP – Active Feedback Control

  20. A with the SDR, rotation aids heat transfer and fluid transport Used for cooling rotating machinery

  21. Other rotating variants

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