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A mathematical model was derived to calculate the IR reflection inside theannulus between two concentric cylindrical tubes, where the inner side of theouter cylinder is assumed to be coated with an IR reflected mirror. Themathematical model is implemented in a simulation code and experimentallyvalidated. The experimental results of a system of two concentric cylindricaltubes operating with an IR reflected mirror on the inside of the outer cylinderare presented, and the results between the model and the simulation arecompared. It is seen that the correspondence is encouragingly close(Chi-squared test p-values between 0.995 and 0.80), where the simulationunderestimates the experimental performance.

IR Reflection mechanism inside the annulus between two concentric cylindrical tubes