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A four objectives optimization for an energy system considered in the environment

Abstract : To optimize a system, the two main points to consider are a precise system definition (boundary between the system and the environment) and a precise choice of criteria to fulfill. Various energy, environmental and economical goals imply various criteria to minimize energy consumption, rejected nonrecoverable heat or entropy production as well as a maximization of the useful effect (even the efficiency). We propose a generalized criterion that takes into account the main four objectives of an energy system. Weighting factors are allocated to the different objectives. To illustrate this point, we consider a Carnot engine in contact with two infinite heat reservoirs (thermostats). The heat transfer model considered uses linear transfer law (constant heat transfer conductance). Thermal losses are considered at various scales. The converter entropy production is supposed to be independent of its hot and cold temperatures that are the two optimization variables. Numerical optimization is performed with various weighting factor distributions. Limit cases are recovered and correspond to optimization results existing in the literature (mainly one-criterion optimizations). However, we distinguish clearly three fundamental assemblies that could be optimized: the converter in contact with the source and sink, the system composed of converter, source and sink and the same system placed in the environment.
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Submitted on : Friday, December 16, 2016 - 4:27:20 PM
Last modification on : Thursday, March 15, 2018 - 3:20:03 PM

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Mathilde Blaise, Michel Feidt. A four objectives optimization for an energy system considered in the environment. International Journal of Energy and Environmental Engineering, Islamic Azad University South Tehran Branch, 2014, pp.1--11. ⟨10.1007/s40095-014-0141-1⟩. ⟨hal-01418381⟩



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