Browsing by Author "Cuadras Tomàs, Àngel"Més informacióMés informació

Now showing items 1-20 of 25

    • Analysis of energy and entropy balance in a residential building 

      Rico Perez, Angel; Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (2022-01-20)
      Article
      Open Access
      The energy performance of a building located in La Roca del Vallès, close to Barcelona in Spain designed under the near Zero Energy Building (nZEB) and Net Zero Energy Building (NZEB) criteria was investigated. The aim was ...

    • Battery aging impedance spectroscopy and incremental capacity analysis 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (ZAHNER-elektrik GmbH & Co. KG, 2017)
      Conference report
      Open Access
      We analize electrochemical LiFePO4 cells with impedance spectroscopy and incremental capacity analysis in order to establish a correlation with capacity fade. We found that polarization and diffusion impeances increased ...

    • Battery Impedance Spectroscopy obtained from Electrochemical Model 

      Miró Jané, Pol; Cuadras Tomàs, Àngel (2017)
      Conference report
      Open Access
      We investigate impedance spectra obtained from an electrochemical model using pulsed signals. We characterize the dependence of NiMH battery parameters such as electrodes porosity and conductivity on impedance. We are able ...

    • Battery state of charge determination from heat and entropy measurements 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (2012)
      Conference lecture
      Restricted access - publisher's policy

    • Battery state of charge determination from phase measurements 

      Cuadras Tomàs, Àngel (2012)
      Conference lecture
      Restricted access - author's decision

    • Contactless entropy measurement with infrared sensors for degradation monitoring 

      Zamora Rovira, Xavier; Cuadras Tomàs, Àngel (Elsevier, 2022-05-01)
      Article
      Restricted access - publisher's policy
      Entropy is a valuable magnitude to monitor degradation processes and energy efficiency. Since no commercial equipment is available to measure entropy, this paper proposes a new contactless entropy measurement system based ...

    • Desarrollo de un sistema de recuperación de amoníaco de purines de cerdo mediante evaporación al vacío 

      Estefano, Roberto; Cuadras Tomàs, Àngel; Flotats Ripoll, Xavier (2018)
      Conference lecture
      Open Access

    • Determination of a System’s Entropy Using Pyroelectric Sensors 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (2015-12)
      Article
      Open Access
      We propose a system for measuring entropy variations, S, in thermal systems using pyroelectric sensors. These sensors convert time-dependent temperature variations into electrical current. Consequently, heat and ...

    • Effects of cycling on lithium-ion battery hysteresis and overvoltage 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (Nature, 2019-10-16)
      Article
      Open Access
      Currently, lithium-ion batteries are widely used as energy storage systems for mobile applications. However, a better understanding of their nature is still required to improve battery management systems (BMS). Overvoltages ...

    • Entropy as a wear out indicator: The resistor example 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia; Quílez Figuerola, Marcos (2013)
      Conference report
      Restricted access - publisher's policy
      In this contribution we aim at proposing entropy measurements in resistive elements to characterize the induced damage due to current and Joule effect dissipation. 0.25 W off the shelf resistors are biased with constant ...

    • Entropy characterisation of overstressed capacitors for lifetime prediction 

      Cuadras Tomàs, Àngel; Romero, Ramón; Ovejas Benedicto, Victòria Júlia (2016-12-30)
      Article
      Open Access
      We propose a method to monitor the ageing and damage of capacitors based on their irreversible entropy generation rate. We overstressed several electrolytic capacitors in the range of 33 µF–100 µF and monitored their entropy ...

    • Entropy generation model to estimate battery ageing 

      Cuadras Tomàs, Àngel; Miró Jané, Pol; Ovejas Benedicto, Victòria Júlia; Estrany Coda, Francesc (Elsevier, 2020-12)
      Article
      Open Access
      Determining battery ageing is a key issue in predicting the available charge in battery-operated systems. Beyond the common use of voltage or current measurements, which have proved unsuccessful as general methods, we aim ...

    • Espacio Virtual de Electrónica Analógica (EVEA): Experiencias multimedia en el Aula 

      Cuadras Tomàs, Àngel; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; López Sánchez, Jaime; Garrido Gonzalez, Miguel; Gasulla Forner, Manuel (Escuela Universitaria Politécnica, Universidad de Las Palmas de Gran Canaria, 2005)
      Conference report
      Open Access
      El proyecto Espacio Virtual de Electrónica Analógica (EVEA) constituye un entorno virtual, accesible desde internet, que integra los contenidos de electrónica analógica presentes en diferentes asignaturas de la titulación ...

    • EVEA: espai virtual d'electrònica analògica 

      Cuadras Tomàs, Àngel; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; Gasulla Forner, Manuel (2006-02)
      Conference report
      Open Access
      El projecte Espai Virtual d’Electrònica Analògica (EVEA) constitueix un entorn virtual, accessible des d’internet, que integra els continguts d’electrònica analògica presents en diferents assignatures de la titulació ...

    • Impedance characterization of an LCO-NMC/graphite cell: ohmic conduction, SEI transport and charge-transfer phenomenon 

      Ovejas Benedicto, Victòria Júlia; Cuadras Tomàs, Àngel (Multidisciplinary Digital Publishing Institute (MDPI), 2018-09-10)
      Article
      Open Access
      Currently, Li-ion cells are the preferred candidates as energy sources for existing portable applications and for those being developed. Thus, a proper characterization of Li-ion cells is required to optimize their use and ...

    • Irreversible entropy model for damage diagnosis in resistors 

      Cuadras Tomàs, Àngel; Crisóstomo, Javier; Ovejas Benedicto, Victòria Júlia; Quílez Figuerola, Marcos (American Institute of Physics (AIP), 2015-10-28)
      Article
      Open Access
      We propose a method to characterize electrical resistor damage based on entropy measurements. Irreversible entropy and the rate at which it is generated are more convenient parameters than resistance for describing damage ...

    • MATLAB® modeling of a microgrid: towards a vision based on entropy balance 

      Khan, Ameer Abdullah; Martínez García, Herminio; Cuadras Tomàs, Àngel (2023-07-01)
      Article
      Open Access
      A microgrid is defined as the link of consumer loads and decentralized energy assets with the ability to control the entire system as a whole. The modeling of an electromagnetic microgrid is discussed in this work to analyze ...

    • Online cellphone battery entropy measurement for SoH estimation 

      Cuadras Tomàs, Àngel; Meinert, Florian; Büschel, Paul; Kanoun, Olfa (2016)
      Conference report
      Restricted access - publisher's policy
      The widespread use of batteries requires knowledge of their state of health (SoH). In this paper we present a method to use entropy evolution as an aging indicator for batteries. Voltage, current and temperature are ...

    • Pyroelectric conversion: harvesting energy from temperature fluctuations 

      Cuadras Tomàs, Àngel (2007-11)
      Conference report
      Open Access

    • Pyroelectric sensor for entropy measurements 

      Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      In this contribution we propose a system to measure entropy fluctuations in thermal systems. The system consist of a pyroelectric sensor and a temperature sensor. The pyroelectric convert thermal variations into electrical ...