Silvia LasalaUniversity of Lorraine | UdL · LRGP - Laboratoire Réactions et Génie des Procédés
Silvia Lasala
Doctor of Engineering
About
37
Publications
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559
Citations
Citations since 2017
Introduction
Additional affiliations
September 2018 - June 2021
March 2016 - present
September 2014 - June 2015
Education
October 2012 - February 2016
September 2010 - October 2012
Publications
Publications (37)
In light of reducing carbon emissions and the tension on non-renewable energy sources, heat pumps are being investigated as an alternative to fossil-fuel-dependent energy converters in heat demanding applications. On the basis of the impactful results the authors obtained in previous research around the potential of using reactive fluids–instead of...
In light of reducing carbon emissions and the tension on non-renewable energy sources, heat pumps are being investigated as an alternative to fossil-fuel-dependent energy converters in heat demanding applications. On the basis of the impactful results the authors obtained in previous research around the potential of using reactive fluids-instead of...
Reactive fluids for intensified thermal energy conversion
With the aim to effectively increase the performances of power plants, refrigeration systems and heat pumps, this project proposes the use of equilibrated reactive working fluids instead of inert ones. It applies an original methodology that integrates thermodynamic and kinetic predictive to...
PPR78 (Predictive-Peng-Robinson78) is a well-established cubic equation of state in which, the temperature-dependent binary interaction parameters (bips) between two molecules i and j [kij(T)] are predicted by a group-contribution method. In such a model, two group-binary-interaction parameters (G-bips), noted Akl and Bkl, are required per (k,l) pa...
In this work, the use of ML methods for the prediction of the enthalpy and entropy of formation of molecules is investigated on the basis of different molecular and structural properties of these molecules, also known as ”descriptors”. Accordingly, different families, containing between 19 and 247 molecules, are extracted from the DIPPR (Design Ins...
Combined cooling, heating, and power (CCHP) systems enable the simultaneous supply of electricity, heating, and cooling, thus meeting the major energy needs of humans in a single device. Conventional CCHP systems consist of the combination of a prime mover, heating, and cooling system, each of them operating with a thermodynamically suitable workin...
Thermal engines, particularly closed power cycles, are currently a focus of many studies mainly because they represent the only way to exploit renewable thermal energy. To increase the exploitation of available thermal sources, this work investigates the higher potential offered by a complementary technology based on the use of reactive working flu...
Cubic equations of state have thus far yielded poor predictions of the thermodynamic properties of quantum fluids such as hydrogen, helium and deuterium at low temperatures. Furthermore, the shape of the optimal α functions of helium and hydrogen have been shown to not decay monotonically as for other fluids. In this work, we derive temperature-dep...
In the last two centuries, equations of state (EoS) have become a key tool for the correlation and prediction of thermodynamic properties of fluids. They can be applied not only to pure substances as well as to mixtures but they also constitute the heart of commercially available computer-aided-process-design software. In the last twenty years, tho...
The 2nd degree polynomial volume function (v2+ubv+wb2), involved in the attractive term of cubic equations of state, has a strong influence on the calculated volumetric properties and, to a lesser extent, influences the calculated vapor-liquid equilibrium properties such as vapor pressure and enthalpy of vaporization. This function contains two par...
In classical chemical engineering thermodynamics, constant-pressure heat capacity has a rigorous – non-negotiable – definition. With this communication we aim to make researchers aware of a thermodynamically inconsistent definition assigned, in the literature, to the heat capacity of equilibrium gaseous mixtures of reacting ortho-hydrogen and para-...
Low-medium temperature heat sources in the range 5–50 MWth are made available by many industrial fields but they may also be of interest for biomass, geothermal and solar energy applications. ORC has been proposed in the last 20 years as a reliable solution for the exploitation of these energy sources since the alternative represented by steam cycl...
The application of CO2 power cycles has proved to be particularly advantageous to exploit high-temperature heat sources (500–800 °C) in the case of available low-temperature heat sinks (15–25 °C). Otherwise, the efficiency of these cycles is strongly reduced when cold sink temperatures are higher than 25 °C. This is the case, for example, of solar...
CO2-based streams treated by CO2 Capture and Storage (CCS) processes may contain different types and amounts of species, such as N2, O2, Ar, H2O, CO, H2, COS, SOx, NOx, NH3, CH4 and H2S, depending on the fuels (coal / gas), the oxidant (air / oxygen) and type of capture technology (pre-combustion / oxy-fuel combustion / post-combustion). As a resul...
The present paper aims to enhance the awareness of users of thermodynamic models on the impact that their accuracy may have in designing and operating units for the purification and compression of CO2-streams produced from capture technologies. After providing a review on the composition of streams produced by coal- or gas-fired plants with post-/p...
With a view to finding which of the available equations of state is the most suitable for the representation of the thermodynamics of mixtures containing nitrogen, oxygen and argon, this paper mainly intends to address the comparison of the performance of the - already optimized - GERG-2008, Bender and Peng-Robinson (PR) Equations of State (EoS) in...
In this study, the thermodynamic behaviour of NO + SO2 mixtures has been investigated by means of molecular simulation, experiment and equation of state modelling. Quantum chemical calculation were performed to investigate possible chemical reactions between NO and SO2. Molecular simulations were based on Monte Carlo and Molecular Dynamics techniqu...
The application of CO2 power cycles is advantageous to exploit high-temperature sources (500-800°C) in the case of available low-temperature heat sinks (15-25°C). However, their efficiency is strongly reduced for higher heat sink temperatures. At these temperatures, due to the low-critical temperature of CO2 (about 31°C), CO2 is in fact compressed...
Low-medium temperature heat sources in the range 5 - 50 MWth are made available by many industrial fields but they may also be of interest for biomass and solar energy applications. ORC has been proposed in the last 20 years as a reliable solution for the exploitation of these energy sources since the alternative represented by steam cycles leads t...
In this paper we investigate the thermal stability of three representative hydrocarbons used as working fluids in organic Rankine cycles (ORC): n-pentane, cyclo-pentane and toluene. The experimental used method is a “static” one, based on the recording of the pressure during the permanence of the fluid sample at constant temperature and on the meas...
Since Van der Waals, the attractive term of any cubic equation of state is expressed as the product of its value at the critical temperature ( ) by the so-called alpha function. Our recent investigations made it however possible to conclude that to get accurate and physically meaningful behaviors in both the subcritical and supercritical domains, i...
Considering the broad range of operating conditions that typically characterize carbon dioxide capture and storage (CCS) processes, on the one side, and the high number of species that compose the processed streams, on the other, it becomes evident the necessity of disposing of suitable equations of state being able to flexibly represent the comple...
It is today acknowledged that thermodynamic models routinely used to model the behaviour of fluids involved in CO2 capture and storage processes are not enough accurate. Such a deficiency is one of the main sources of uncertainty for estimating the costs associated to these technologies and as a direct consequence engineers largely oversize the equ...
Parameters contained in thermodynamic models are usually optimized over vapor-liquid equilibrium data of binary systems, applying methods that enable consideration of the uncertainty of experimental data, such as the Maximum Likelihood Method (MLM). However, authors of these data generally indicate only the maximum or average uncertainty associated...
The so-called “Peng-Robinson + residual Helmholtz energy-based mixing rules” equation of state is a promising thermodynamic model that enables the accurate representation of VLE properties of highly non–ideal binary mixtures including the Type-III phase behaviour, according to the classification of van Konynenburg and Scott. So far, the accuracy of...
This study highlights that α-functions used in cubic equations of state must be of class C2 i.e. that their first and second derivatives must exist and must be continuous, positive , monotonically decreasing , convex and also verify , for any value of the temperature T. Our proposed “consistency test for α-functions” gathers all these conditions. T...
Mainly due to the complex thermodynamic modelling of high-pressure CO2-based mixtures containing supercritical components, none of the thermodynamic models present in the literature shows a sufficient accuracy level in describing both their low and high-pressure saturation properties. One of the most challenging thermodynamic tasks is, in fact, the...
The target of reducing the worldwide level of greenhouse gases emitted by industries has diverted the focus of engineers and scientists towards the achievement of an increased efficiency of production processes, on the one side, and the design of innovative low-CO2 emissions energy systems, on the other. In this context, new technologies have been...
The thermal stability analysis of perfluorohexane (C6F14)is presented in this paper as a preliminary evaluation of the potential application of the binary mixture CO2 – C6F14 as innovative working fluid for transcritical-CO2 power cycles. After presentinga description of the experimental apparatus, saturation pressure models are compared and calibr...
At present, the accurate evaluation of the thermo-physical behaviour of multicomponent fluids represents a crucial element for studying and simulating low CO2 emission energy conversion technologies. In order to extend the range of application of the available thermodynamic models, an intense experimental research activity has been performed in rec...
Nowadays, supercritical carbon dioxide (S-CO2) Brayton cycles offer the potential of equivalent or higher cycle efficiency compared to supercritical or reheated steam cycles at turbine inlet temperatures relevant for nuclear, solar and geothermal energy conversion systems. The economy of S-CO2 cycles could be improved if the working fluid is conden...
Projects
Projects (2)
Reparameterization of the Twu alpha function of pure compounds is performed and safe extrapolation in the supercritical temperature domain is ensured through mathematical constraints. Mathematical analysis of the volume translation method is done. The ct-PR CEoS for pure compounds, involving these two features, is now available. Implementation of new mixing rules is the next step.
