Analyses of entransy dissipation, entropy generation and entransy–dissipation-based thermal resistance on heat exchanger optimization

Entransy, Entransy Dissipation and Entransy Loss for Analyses of Heat Transfer and Heat-Work Conversion Processes

“…Based on the entransy theory, the uniformity principle of temperature difference field for heat exchangers was proved by Song et al (42) and Cheng et al (13) . Song et al (42) found that the maximum heat transfer rate corresponds to the uniform temperature difference field with prescribed entransy dissipation, while the minimum entransy dissipation corresponds to the uniform temperature difference field with prescribed heat transfer rate.…”

“…The minimum entransy-dissipation-based thermal resistance principle indicates that smaller thermal resistance leads to better heat transfer performance. These principles of the entransy theory have found applications in optimizing heat conduction (4,(28)(29)(30)(31)(32) , heat convection (4,27,(33)(34)(35) , thermal radiation (36,37) and the design of heat exchangers (12,13,15,38,39) and heat exchangers networks (14,15) , and no paradox similar to the entropy generation paradox is noticed up to now (12,13,15,38) .…”

“…Qian et al (12) also observed that the entropy generation number increases first and then decreases with the increase of the number of heat transfer units in the heat exchangers. Cheng et al (13)(14)(15) demonstrated that the entropy generation of the heat exchangers and heat exchanger networks first increases and then decreases with the increase in effectiveness and heat transfer rate. Therefore, the entropy generation minimization does not always lead to optimal heat transfer.…”

“…Song et al (42) found that the maximum heat transfer rate corresponds to the uniform temperature difference field with prescribed entransy dissipation, while the minimum entransy dissipation corresponds to the uniform temperature difference field with prescribed heat transfer rate. Cheng et al (13) set up the mathematical relation between the uniformity factor of temperature difference field and the effectiveness of heat exchangers, and proved that larger uniformity factor of temperature difference field always goes with a smaller entransy-dissipation-based thermal resistance and a higher effectiveness. For the field synergy principle, Yuan and Chen (35) found that the heat convection optimization results from the entransy theory and the field synergy principle are the same for fixed viscous dissipation rate with a prescribed temperature boundary condition.…”

Entransy Loss and its Application to Atkinson Cycle Performance Evaluation

“…Then, the extremum entransy dissipation principle is equivalent to the minimum thermal resistance principle. The principle of entransy theory are used to optimize heat conduction [11,12], heat convection [13], thermal radiation [14,15] and the optimization design of heat exchangers and heat exchangers network [16,17],and are proved to be appropriate in heat transfer optimization.…”