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Convective heat transfer optimization based on minimum entransy dissipation is studied in this paper.
A comparison among minimum heat consumption (MHC), minimum entransy dissipation (MED) and minimum power consumption (MPC) is conducted.
Within the discussed variation range of the cooling water velocities, the minimum entransy dissipation rate is 2.09% less than the maximum entransy dissipation rate.
The optimality condition for the minimum entransy dissipation of the mass transfer process with a generalized mass transfer law is obtained by applying an optimal control theory.
Comparing to minimum entropy generation and minimum entransy dissipation, an approach of minimum heat consumption is proposed to optimize heat transfer process.
Based on the analytic solution of temperature difference and humidity ratio difference between air and solution, minimum entransy dissipation is determined when the states of inlet air and solution lie on the same iso-relative humidity line.
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The results indicate that the minimum entransy-dissipation-based thermal resistance always corresponds to the highest heat transfer rate, while the design with the minimum entropy generation is not always related to the design with the highest heat transfer rate.
It is found that the minimum thermal resistance based on entransy dissipation always corresponds to the best performance of heat exchangers, while the minimum entropy generation and the extreme entransy dissipation do not always correspond to the best performance of heat exchangers.
The optimal flow distribution principle is obtained by calculating the minimum value of the total entransy dissipation.
It was also found that the parameter of minimum thermal resistance based on the entransy dissipation can be used to optimize the heat transfer performance, and therefore designing the optimal heat exchanger structure.
The results show that there exists twice optimal axial diameter ratio and optimal cooling water velocity which makes the entransy dissipation rate of the blast furnace wall reach its critical minimum.
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