Use of the exergy concept for design improvement of heat exchangers and heat exchanger networks Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gb19f8682

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  • The second law of thermodynamics, through the exergy concept, allows us to quantify and rationally cost the consumption of exergy (irreversibility) used to drive the heat exchange process and the effluent losses of exergy in a heat exchanger For systems with a network of heat exchangers, the exergy concept recognizes that properly integrated heat pumps reduce the heat transfer irreversibility; this results in reduced utility consumption. Furthermore, heat engines properly integrated in heat exchanger networks recover a fraction of the thermodynamic potential destroyed during the heat transfer process and generate power at very high efficiencies. Heat exchanger design conditions are initially characterized in this thesis and potential trade-off options are discussed. A modification to the irreversibility minimization method is proposed next, and the proposed method is shown to give more realistic guideposts for heat exchangers, compared to the corresponding guideposts obtained from present methods. This thesis also proposes a method to obtain the irreversibility cost coefficients for heat exchangers residing in complex systems. The application of the modified irreversibility method proposed here, and the thermoeconomic method, are illustrated by optimizing an emerging technology ceramic heat exchanger residing in a complex power plant. A method based on the exergy concept is developed to recognize the potential for improvement of processes with process integrated heat pumps and heat engines. Once potential processes have been identified, economically optimum load and level of integration have to be determined. The method of formulating the economic optimization problem is presented, and bounds for some design variables are finally developed.
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