Papers by Massimo Guarnieri
Three-dimensional Modelling of Extremely Low Frequency Thin Conducting Screens
Electromagnetic Field, Health and Environment A. Krawczyk et al.(Eds.) IOS Press, 2008 151 © 2008... more Electromagnetic Field, Health and Environment A. Krawczyk et al.(Eds.) IOS Press, 2008 151 © 2008 The authors and IOS Press. All rights reserved. Three-dimensional Modelling of Extremely Low Frequency Thin Conducting Screens Piergiorgio ALOTTO, Massimo GUARNIERI, ...
Impedance Analysis of a Domestic Induction Appliance with Energy− Efficient Cookware
ECS Meeting Abstracts, 2020
An industrial-scale Vanadium redox flow battery test facility (IS-VRFB) in operation at the Elect... more An industrial-scale Vanadium redox flow battery test facility (IS-VRFB) in operation at the Electrochemical Energy Storage and Conversion Laboratory of University of Padua aims at exploring the technological developments from VRFB laboratory testbeds to grid scale VRFB systems. The 40-cell 600-cm2 active-area stack and two 550-L tanks provide a power of 9 kW and an energy 27 kW h. An AC/DC bidirectional static converter that controlled by the battery management system (BMS) provides the electric power conditioning during charge and discharge with currents up to 75 A and a variable passive load allows high-current discharges up to 600 A. The plant is fully instrumented with electrical and thermo-fluid dynamic probes and the in-house LabVIEW-based BMS provides acquisition, processing and control functions. Since VRFBs are capable of fast response times and can provide fast grid services, such as frequency regulation, it is quite important characterizing their transient behavior. Nerve...
2020 2nd IEEE International Conference on Industrial Electronics for Sustainable Energy Systems (IESES), 2020
A Battery Management System (BMS) for a kWclass vanadium redox flow battery (VRFB) was developed ... more A Battery Management System (BMS) for a kWclass vanadium redox flow battery (VRFB) was developed and is reported in this paper. This kind of BMSs is intrinsically different from those of solid-state batteries, due to the very different battery operating principle. Such BMS was built entirely in-house around a desktop computer provided with LabVIEW software which results in an expandable and flexible system capable of providing the battery with SCADA functions. It acquires and processes all data generated by the thermo-fluid and electric sensors, which are necessary to carry out the subsequent analyses. Moreover, this BMS also creates the feedback signals for controlling every operation, including experiments such as polarization curves plotting and efficiency computation. As regards polarization curves, this algorithm implements an experimental protocol that allows to obtain such performance in reproducible conditions and possibly comparable with those of similar stacks. The efficiency computation algorithm computes the energy absorbed (or delivered) by the battery while acquiring and controlling all signals so as to ensure safe conditions. The management of signal between stack and BMS includes the galvanic insulation of cell and stack voltages, consisting of multiple opto-isolators and a DC/DC transformer.
Energy Conversion and Management, 2020
Standby is a condition that may occur several times and for long periods in the operation of a re... more Standby is a condition that may occur several times and for long periods in the operation of a redox flow battery for energy storage services in electrical grids (from a national grid down to smart grids, microgrids, …), so that the efficient operation of these batteries calls for specific standby management procedures, capable of minimizing losses while avoiding solutes precipitation. This paper describes the characteristics of a standby thermal management system capable of performing these tasks with high efficiency. Its design resorts to an experimental and numerical investigation that made use of a cell-resolved dynamic thermal model, determining the stack voltage, self-discharge and temperature evolutions. Two different standby modes were analyzed: one with no electrolyte flow (named "swamped standby mode") and the other with a small electrolyte cooling flow rate (named "streamed standby mode"). In addition, the critical conditions which may lead to V(V) precipitation were identified based on published experimental data. As regards the swamped standby mode, an advanced strategy consisting of smart intermittent washings was designed and tested on a kW-scale vanadium redox flow battery system, showing a dramatic reduction of self-discharge losses compared to a conventional fixed periodic washing. As regards the streamed standby mode, the optimal value of the cooling electrolyte flow rate that minimizes self-discharge was identified. With respect to the swamped one, the streamed standby mode ensures the battery readiness to provide fast power service in safe conditions. To the best of the authors' knowledge, this is the first work in which such thermal management strategy during standby, supported by experimental validation on a kW-class vanadium redox flow battery, is presented.
Journal of Power Sources, 2019
An analysis is presented of the losses occurring in a kW-class vanadium redox flow battery due to... more An analysis is presented of the losses occurring in a kW-class vanadium redox flow battery due to species crossover, shunt current, hydraulic pressure drops and pumping, in addition to cell overpotentials. The study was developed on a 9 kW / 27 kW h test facility that includes a stack consisting of a 40 600-cm 2 cells and two 550 L electrolyte tanks. The analysis was carried out combining experimental data and model results. The losses were evaluated as functions of the solutions flow rates at stack currents of 30 A, 50 A and 70 A. Charge-discharge cycles performed at a constant flow factor equal to 8 and thus at variable flow rate were analyzed. Results show that shunt currents have a tenfold to twentyfold higher effect than hydraulic pressure drop inside the stack. As regards cell membranes, it has been found that, in terms of efficiency, the ion conductivity (i.e. cell overpotentials) counts more than species diffusivity (i.e. crossover). Moreover, it was found that pumps and their motors can affect significantly the efficiency of a kW-class vanadium redox flow battery system.
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Jul 12, 2011
Purpose-The paper seeks to do the following. To provide an expression of the electromagnetic powe... more Purpose-The paper seeks to do the following. To provide an expression of the electromagnetic power flow that is alternative to the Poynting's theorem expression, overcomes its postulate feature, and is particularly suitable for electric circuit elements. Design/methodology/approach-The paper proceeds from fundamental electromagnetic laws and, independently of Poynting's formulation, follows an approach that generalize established double formulations of the electrostatic and magnetostatic energies. Findings-The paper proposes a compact and straightforward expression of the electromagnetic power flow based on the fundamental electromagnetic field sources, i.e. charge and current densities. Practical implications-The achieved expression confirms Poynting's expression in the case of electric elements, overcoming its arbitrariness, generalizes previous partial results by other authors, deduced via the Poynting's power balance. Originality/value-Is promising in the computation of power flow electromagnetic devices connected in electrical circuits, i.e. for coupled problems where the analysis of electromagnetic system interfaced to electric circuits is required. Due to its simple structure and straightforward deduction it has educational value to demonstrate the expressions of the electric power in circuit elements.
Before Lithium-Ion Batteries: The Age of Primary Cells [Historical]
IEEE Industrial Electronics Magazine, Jun 1, 2022
General Electrolytes and Interfaces
228th ECS Meeting (October 11-15, 2015), Oct 15, 2015
Fatti e protagonisti dell'elettromagnetismo - breve compendio crono-biografico delle scienze e tecnologie elettromagnetiche
La distribuzione dell'energia elettrica: nascita, affermazione e contributi italiani
IEEE Industrial Electronics Magazine, Dec 1, 2019
IEEE Industrial Electronics Magazine, Sep 1, 2016
IEEE Industrial Electronics Magazine, Mar 1, 2015
Elementi di Elettrotecnica circuitale
The rise of light
This article is inspired by the celebration of the year light in 2015 and regards the long lastin... more This article is inspired by the celebration of the year light in 2015 and regards the long lasting relationship between man and light. Man started using light in prehistoric times and the oldest traces of scientific investigations on light date back to ancient China and Greece. While the long march of science led to the modern theories of light Maxwell, Einstien and quantum electrodynamics, light technologies have developed providing more and more differentiated applications. Since long ago we have used various forms of artificial light that have profoundly impacted in our working systems and life. More recently we have learned to use the light in a large family of technologies, include photography, cinema and television, and also the technological domain of optoelectronics, that regards the management, processing and transmission of information, which so deeply characterize our society.
IEEE Industrial Electronics Magazine, Dec 1, 2012
IEEE Industrial Electronics Magazine, Mar 1, 2012
IEEE Industrial Electronics Magazine, Jun 1, 2019
Celle a combustibile: modellazione multiphysics, caratterizzazione dei materiali e integrazione di sistema
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Papers by Massimo Guarnieri