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

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Presentation on theme: "HEAT PIPES FOR CONTROL CAN THEY BE USED IN CHEMICAL REACTORS ETC?"— Presentation transcript:

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

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

22 Other rotating variants


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