Heat Exchangers - Basic Design Applications by J. Mitrovic

By J. Mitrovic

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Their method was based on the determination on a local basis of the two components of the entropy generation rate: the one caused by viscous dissipations and the one due to thermal irreversibilities. Depending on the engineering purpose for which a technical device was designed, it could be argued that the 'optimal' configuration would be that in which either one (or both) of these two entropy generation rates was minimized. For a heat exchanging device, it was important to minimize thermal irreversibilities, but more important was to minimize the mechanical power lost in achieving a prescribed heat-exchange performance: to this purpose, one could form a 'relative irreversibility index' (named 'Bejan number (Be)' here and use it to assess the merit of a given configuration.

S T ,o  S T ,a S P ,a  S P ,o (40) This new parameter represents the ratio of entropy generation reduction due to heat transfer enhancement and the increase in entropy generation due to the consequent increase in fluid friction. Thermodynamics benefits would be obtained only if   1. The magnitude of  was such that a better resolution was obtained for the entropy generation change due to the variations in operating conditions. They reported entropy generation numbers for three types of flow: constant mass flow rate, constant pressure drop, and constant pumping power.

The helical baffles were designed as quadrant ellipses and every baffle occupied one quadrant of the cross-section of the shell side. The researchers carried out experimental tests with cold water in the tube side with a constant flow rate, and hot oil on the shell side with flow rate range from 4–24 m3/h. They measured the temperatures and pressures for the inlet and outlet of both sides. They investigated heat transfer, pressure drop, entropy generation, and exergy loss of the new heat exchanger and compared with the results for a conventional shell-and-tube heat exchanger with segmental baffles.

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