Facultad Regional Rosario

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End date: 2019

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    Modelo reducido para el diseño óptimo de un sistema colectores solares cilindro-parabólicos + acumulador de inercia para la provisión de servicios de calentamiento en la industria de procesos.
    (2018) Biain, Jesús Alejandro
    A partir de la implementación del modelo matemático en GAMS de una red de concentradores cilindro-parabólicos de mediana temperatura con su correspondiente tanque de acumulación de inercia (que garantiza que la demanda será suplida en todo el horizonte de tiempo), se optimiza el área de los colectores solares sujeto a la demanda térmica, propia de diversos procesos. Los resultados permiten obtener un método sencillo que de manera rápida y directa estima la factibilidad para acoplarlo a una industria en una localidad conocida.
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    Optimización del diseño y operación de un concentrador solar cilindro-parabólico.
    (2016) Biain, Jesús Alejandro
    La dificultad actual industrial y comercial para adquirir concentradores solares exige una optimización de su diseño a fin de disminuir su costo. A partir de la implementación del modelo matemático en GAMS de un concentrador cilindro-parabólico, se optimiza tanto el rendimiento del equipo como su área de recolección. Los resultados obtenidos muestran que la apertura del equipo es una variable relevante a la hora de mejorar el diseño; que el máximo rendimiento factible es elevado (respecto de otros ciclos térmicos); y que el área del equipo puede reducirse significativamente respecto a la de un diseño convencional, sin grandes pérdidas de rendimiento.
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    Modelado matemático, validación y análisis del proceso de extracción de antocianinas en harina de orujos tintos a diferentes temperaturas.
    (2018-07) Bonfigli, Mónica Beatriz; Chiandoni, Florencia Soledad; Kraft, Romina Alejandra; Reinheimer, María Agustina
    La extracción sólido-líquido es una operación unitaria ampliamente utilizada para extraer compuestos biológicos de interés de diversas matrices alimentarias. En el presente trabajo se ha desarrollado un modelo matemático para el análisis del proceso de extracción de antocianinas en orujos tintos. El modelo está formado tanto por ecuaciones algebraicas como diferenciales y fue desarrollado en el software de optimización GAMS (General Algebraic Modeling System). Para la implementación de las ecuaciones a derivadas parciales en el modelo se utilizó el método implícito de discretización. Para la validación del modelo, se llevaron a cabo corridas a diferentes temperaturas de extracción (25, 45 y 65 ºC), utilizando como solvente extractor una mezcla hidro-alcohólica (50:50). Se observó un buen ajuste entre los valores óptimos obtenidos y experimentales, observándose que se obtiene una mayor eficiencia de extracción a 45 ºC.
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    Optimal management policies for the economic optimal dispatch of a hydrothermal power grid.
    (2016-06) D' Emanuele Ares, Carolina; Godoy, Ezequiel; Scenna, Nicolás José
    Presentación en diapositivas realizada en : EngOpt 2016, 19 al 23 de Junio de 2016, Foz de Iguazú, Brasil.
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    Economic implications when considering availability in the optimal design and operation of a NGCC power plant.
    (2012-09) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    - Traditionally, power plants are designed to fulfll a pre-specified external demand, usually by oversizing the existing equipment, which implies excessive capital costs and might even result in designs that cannot satisfy demands for certain situations. Therefore, in order to avoid large economic penalties if power demand is not satisfied, the design and operation of such systems need to consider the effect of reliability considerations and maintenance funds allocation on the system design and operative characteristics. In the present work, a MINLP formulation is developed to address the design and operation of power plants while considering the implications of a statespace availability modeling approach and of a comprehensive maintenance funds allocation policy. Then, the decision variables are optimized simultaneously throughout several maintenance and failure situations that configure difeerent scenarios, in order to ensure that the plant will be able to cope with them while meeting the expected requirements at minimum cost.
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    Implications of a state-space approach for the economic optimal design of a NGCC power plan.
    (2014-10) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    A detailed state-space approach is here embedded in the optimization model for the economic design of a new natural gas combined cycle (NGCC) power plant. This proposal comprehensively quantifies the impact of different adopted values for two critical parameters: the number of simultaneously and independently failed components, and the number of simultaneous events. The former depicts the maximum number of components (gas turbines, steam turbine, HRSGs, auxiliary services, etc.) that seem feasible to fail because of independent causes at the same time. The latter describes the maximum number of transitions between operating conditions, which is directly linked to the amount of available maintenance resources (personnel, parts, etc). Implications of a wide array of values for these two parameters over the economic optimal solutions are thoroughly discussed, where it is observed that more accurate and detailed estimations of the expected economic performance for the project are attained.
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    Development of optimization models for food processing operations with focus on adding value to by products.
    (2018-09) Reinheimer, María Agustina; Godoy, Ezequiel; Balzarini, María Florencia; Accoroni, Cecilia
    Development of optimization models for food processing operations with focus on adding value to by products.. (Resumen)
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    Strategy for optimization of CCGT power plants by solving a simple nonlinear equations system and constraint equations.
    (2010-07) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    A strategy for the solution of the optimization problem of minimum cost of combined cycle gas turbine power plants is presented. Specific relationships, valid at the optimal solution, among selected decision variables are used to introduce new constraints to the optimization problem. Then, the feasible region is reduced to a “single point”, and the resolution strategy becomes equivalent to solving the resultant set of non-linear equations system and constraint equations so achieved to optimize the system. This approach can also be used to achieve reduced models for real time optimization problems.
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    Life cycle oriented design of a GT + 1PSH HRSG type CCGT power plant .
    (2009-12) Godoy, Ezequiel; Scenna, Nicolás José; Benz, Sonia Judith
    In the present work, a life cycle oriented approach is used for designing power plants in a way they can satisfy the desired demand along the whole time horizon, while selected economic indicators of the project are optimized. As case study, optimal design characteristics as well as optimal values of long term operation parameters of a GT + 1PSH HRSG Type CCGT power plant (GT: gas turbine, 1PSH: 1 pressure with superheater, HSRG: heat recovery steam generator, CCGT: combined cycle gas turbine) are obtained by means of a multiperiod mathematical model, seeing that the net present value of the facility is maximized. In addition, advantages of the life cycle oriented approach are discussed when compared with a power plant design obtained by traditional methods.
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    Optimal design of a two-stage membrane system for hydrogen separation in refining processes.
    (2018-10-31) Arias, Ana Marisa; Mores, Patricia Liliana; Scenna, Nicolás José; Caballero, José Antonio; Mussati, Sergio Fabián; Mussati, Miguel Ceferino
    This paper fits into the process system engineering field by addressing the optimization of a two-stage membrane system for H2 separation in refinery processes. To this end, a nonlinear mathematical programming (NLP) model is developed to simultaneously optimize the size of each membrane stage (membrane area, heat transfer area, and installed power for compressors and vacuum pumps) and operating conditions (flow rates, pressures, temperatures, and compositions) to achieve desired target levels of H2 product purity and H2 recovery at a minimum total annual cost. Optimal configuration and process design are obtained from a model which embeds different operating modes and process configurations. For instance, the following candidate ways to create the driving force across the membrane are embedded: (a) compression of both feed and/or permeate streams, or (b) vacuum application in permeate streams, or (c) a combination of (a) and (b). In addition, the potential selection of an expansion turbine to recover energy from the retentate stream (energy recovery system) is also embedded. For a H2 product purity of 0.90 and H2 recovery of 90%, a minimum total annual cost of 1.764 M$·year−1 was obtained for treating 100 kmol·h−1 with 0.18, 0.16, 0.62, and 0.04 mole fraction of H2, CO, N2, CO2, respectively. The optimal solution selected a combination of compression and vacuum to create the driving force and removed the expansion turbine. Afterwards, this optimal solution was compared in terms of costs, process-unit sizes, and operating conditions to the following two suboptimal solutions: (i) no vacuum in permeate stream is applied, and (ii) the expansion turbine is included into the process. The comparison showed that the latter (ii) has the highest total annual cost (TAC) value, which is around 7% higher than the former (i) and 24% higher than the found optimal solution. Finally, a sensitivity analysis to investigate the influence of the desired H2 product purity and H2 recovery is presented. Opposite cost-based trade-offs between total membrane area and total electric power were observed with the variations of these two model parameters. This paper contributes a valuable decision support tool in the process system engineering field for designing, simulating, and optimizing membranebased systems for H2 separation in a particular industrial case; and the presented optimization resultsprovide useful guidelines to assist in selecting the optimal configuration and operating mode.