Thermoeconomic analyses in thermal system design are always focused on the economic objective. However, knowledge of only the economic minimum may not be sufficient in the decision making process, since solutions with a higher thermodynamic efficiency, in spite of small increases in total costs, may result in much more interesting designs due to changes in energy market prices or in energy poli...

The concept of optimization operating and design parameters the regenerative air turbine cogeneration (RATC) system is proposed. To determine energy efficiency indicators this system, its thermodynamic analysis was performed. At same time, it shown that not correct to search for optimal such a only by indicators, modern thermoeconomic methods should be more actively involved in pre-design pract...

Three alternatives for integrating a solar field with the bottoming cycle of a combined cycle plant are modeled: parabolic troughs with oil at intermediate and low cycle pressures and Fresnel linear collectors at low cycle pressure. It is assumed that the plant will always operate at nominal conditions, using post-combustion during the hours of no solar resource. A thermoeconomic study of the o...

Sugar cane production in Brazil is one of the most competitive segments of the national economy, producing sugar and ethanol for internal and external markets. Sugar production is done basically in several steps: juice extraction, juice clarification and evaporation, syrup treatment and sugar boiling, crystallization, centrifugation and drying. Much heat exchange equipment is used in this proce...

Thermoeconomic models, which combine the concept of cost in the field of economics and the concept of exergy in the field of thermodynamics, provide a possibility of optimizing complex energy-generating systems to achieve a best balance between thermodynamic efficiency and economic cost (including investment cost and operation cost). For the first time, operation optimization on a 300 MW coal-f...

This paper reviews the fundamentals of Exergy Cost Theory, an energy cost accounting methodology to evaluate physical costs products systems and their associated waste. Besides, a mathematical computationally approach is presented, which will allow practitioner carry out studies on production regardless structural complexity. The exergy theory was proposed in 1986 by Valero et al. “General savi...

This paper presents a thermoeconomic analysis of polygeneration system based on solar-assisted desiccant cooling. The overall plant layout supplies electricity, space heating and cooling, domestic hot water, freshwater for residential building. combines photovoltaic/thermal collectors, photovoltaic panels, biomass boiler coupled with reverse osmosis air conditioning. was modeled in TRNSYS simul...