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Conclusion & Going Further
Hi. Nice design, but, from a thermodynamic point of view, I'm not sure that copper cylinders (or any metal or good thermal conducting material) are a good idea to improve engine efficiancy : you will lose energy directly in the surrounding air. I think that glass or resines or other kind of low thermal conductivity should fit better. But, of course, it has to sustain the temperature of your heating source !!!
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