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Optimal diameters of triple concentric-tube heat exchangers

2018; International Information and Engineering Technology Association; Volume: 36; Issue: 1 Linguagem: Inglês

10.18280/ijht.360149

0392-8764

Achour Touatit, Chérif Bougriou,

Nanofluid Flow and Heat Transfer

A Fortran code of calculation is used to determine the temperature profiles of three fluids, as well the various heat transfer coefficients, the total frictional power expenditure in a triple concentric-tube heat echanger in steady state.The system is composed of three concentric tubes, hydrogen flows into the central tube, nitrogen passes through the inner annulus and oxygen flows into the outer annulus passage in cocurrent and counter-current flows.The thermophysical properties used in this study are supposed variables with the temperature.We use in this study a techno-economic method to optimize the heat exchanger by determining the optimal diameter corresponding to the minimal total cost of the heat exchanger (functioning and investment).Now we have only one optimum tube diameter for each heat exchanger which corresponds to the minimum total cost of the heat exchanger (total frictional power expenditure and the fabrication of the heat exchanger), unlike previous studies in the literature, where we had two optimal tube diameters: the first corresponds to the maximal heat exchanger efficiency and the last one to the minimal energy consumption required to overcome the pressure drop in the heat exchanger.