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    • A 0D approach fot extended operational modeling of air ejectors in thermal systems 

      Schillaci, Eugenio; Oliet Casasayas, Carles; Ablanque Mejía, Nicolás; Torras Ortiz, Santiago; Vemula, Jagadish Babu; Duponcheel, Matthieu; Bartosiewicz, Yann; Planquart, Philippe (Begell House, 2023)
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      Classic ejector models work accurately only in normal operating conditions, i.e. when the primary flow is in supercritical conditions. Moreover, they do not take into account abnormal situations, such as when the primary ...

    • A finite volume method to solve the frost growth using dynamic meshes 

      Bartrons Casademont, Eduard; Oliet Casasayas, Carles; Gutiérrez Álvarez, Enrique; Naseri, Alireza; Pérez Segarra, Carlos David (2018-09-01)
      Article
      Accés obert
      The physical mechanisms of frost formation have been widely studied, yet much empirism is still needed in numerical approaches. Indeed, accurate simulations of frost growth can be reached by setting up a specific combination ...

    • A numerical study on turbulent flow in an Inertial Particle Separator device 

      Bahramian, Linda; Amani, Ahmad; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2023)
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      An Inertia Particle Separator (IPS) is a device situated in the intake of the aircraft to remove particles from entering the engine; consisting of two types of outlets: core and scavenge. This work presents the numerical ...

    • A simple optimization approach for the insulation thickness distribution in household refrigerators 

      Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Elsevier, 2018-09)
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      Accés obert
      Determination of the optimal insulation thickness is of great relevance in many thermal engineering applications. In this paper, a simple optimization strategy based on the Lagrange multipliers is presented. The optimal ...

    • Air ejector analysis in normal and abnormal modes, oriented to control purposes in aircraft systems 

      Schillaci, Eugenio; Oliet Casasayas, Carles; Vemula, Jagadish Babu; Duponcheel, Matthieu; Bartosiewicz, Yann; Planquart, Philippe (European Conference for AeroSpace Sciences (EUCASS), 2022)
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      The integration of Ultra High Bypass Ratio (UHBR) engines introduces important restrictions of space for the aircraft pylon, and as a consequence on the embedded bleed air system. Under this scenario, a reduction of the ...

    • Air ejector znalysis in extended operational perimeter for control oriented simulation of bleed-air aircraft systems 

      Schillaci, Eugenio; Oliet Casasayas, Carles; Vemula, Jagadish Babu; Duponcheel, Matthieu; Bartosiewicz, Yann; Planquart, Philippe (Institute of Physics (IOP), 2023-06-28)
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      The integration of large size Ultra High Bypass Ratio (UHBR) engines introduces new restrictions of space for their integration with the aircraft wing. Under this scenario, a reduction of the size of the bleed air system ...

    • An efficient strategy of parcel modeling for polydispersed multiphase turbulent flows 

      Bahramian, Linda; Muela Castro, Jordi; Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Trias Miquel, Francesc Xavier (Scipedia, 2022)
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      A three-dimensional particle-laden two-phase turbulent flow by employing the Eulerian-Lagrangian method using multiphase Particle-In-Cell model is implemented to analyze the effects of parcel modeling. In order to achieve ...

    • An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna 

      Favre, F.; Antepara Zambrano, Óscar; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2019-02-05)
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      Considering that the most common reason for electronic component failure is the excessive temperature level, an efficient thermal management design can prolong the operating life of the equipment, while also increasing its ...

    • Analysis and design of a drain water heat recovery storage unit based on PCM plates 

      Morales-Ruiz, S; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Oliva Llena, Asensio (2016-10-01)
      Article
      Accés obert
      This paper is focused on the detailed analysis of a PCM plate heat storage unit with a particular configuration, looking for the maximum contact area with the fluid (water) and the minimum volume to be used in a real ...

    • Analysis of fin-and-tube evaporators in no-frost domestic refrigerators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2010)
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      This paper summarizes the research work carried out by the authors on domestic refrigerator no-frost evaporators. It includes an explanation of the experimental unit that is currently being constructed to test isobutane ...

    • Analysis of the dynamic behavior of refrigerated spaces using air curtains 

      Jaramillo Ibarra, Julian Ernesto; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Oliet Casasayas, Carles (2009-01-01)
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      This article is devoted to the study of air curtains applied to reduce the refrigerated chambers heat gains. The proposed strategy is based on the numerical simulation of air curtains by means of computational fluid dynamics ...

    • Analysis of vapour-compression refrigerating systems 

      Sadurní Caballol, Alexandre; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2011)
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      The aim of this paper is to show the authors proposal for steady state numerical simulation of Vapour-Compression Refrigerating Systems (dry expansion, liquid overfeed systems, ...). The developed tool allows using different ...

    • Assessment of numerical aspects using LES in particle separation devices 

      Muela Castro, Jordi; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio (European Conference for AeroSpace Sciences (EUCASS), 2019)
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      Numerical simulations can be a powerful tool for the design and optimization of Foreign Object Debris (FOD) protection and separation devices. This work aims to study the relevance and influence of different modelling and ...

    • Calibration of the 0D model of an air ejector by means of compressible RANS simulations 

      Schillaci, Eugenio; Oliet Casasayas, Carles; Vemula, Jagadish Babu; Duponcheel, Matthieu; Bartosiewicz, Yann (Begell House, 2023)
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      This work analyzes the need to perform a series of CFD simulations in order to calibrate 0D ejector models. The proposed case study consists in the analysis of a supersonic air ejector used in the aeronautical field to ...

    • CFD-based multi-fidelity surrogate model for prediction of flow parameters in a ventilated room 

      Morozova, Nina; Trias Miquel, Francesc Xavier; Vanovskiy, Vladimir; Oliet Casasayas, Carles; Burnaev, Evgeny (Scipedia, 2022)
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      In this work, we present a multi-fidelity machine learning surrogate model, which predicts comfort-related flow parameters in a ventilated room with a heated floor. The model uses coarse- and fine-grid CFD data obtained ...

    • Comparison of Sliding Mesh and Immersed Boundary Methods in Unsteady Simulations 

      Vera i Fernández, Jordi; Muela Castro, Jordi; Favre, Federico; Oliet Casasayas, Carles (2021)
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      The feasibility and accuracy of two methods for simulating moving bodies inside a fluid are studied. Different cases are presented using the Immersed Boundary Method and the Sliding Mesh technique. The results obtained by ...

    • Comparison of the performance of falling film and bubble absorbers for air-cooled absorption systems 

      Castro González, Jesús; Oliet Casasayas, Carles; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2009-07-01)
      Article
      Accés obert
      Small capacity, air-cooled NH3–H2O absorption systems are becoming more attractive in applications where the input energy can be obtained for free (e.g., solar energy, exhaust gases of engines, etc.), due to the increasing ...

    • Computational investigation of the hexagonal honeycomb adsorption reactor for cooling applications: Honeycomb adsorption reactor for cooling 

      Papakokkinos, Giorgos; Castro González, Jesús; Oliet Casasayas, Carles; Oliva Llena, Asensio (2022-02-05)
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      Accés obert
      Adsorption cooling is a sustainable technology, since it can utilize solar energy or waste heat, while employing substances without ozone depletion and global warming potential. The adsorption reactor design is determinant ...

    • Coupling of thermal and electrical systems for the simulation of ECS architectures 

      Ablanque Mejía, Nicolás; Gurumurthy, Sriram; Torras Ortiz, Santiago; Monti, Antonello; Rigola Serrano, Joaquim; Oliet Casasayas, Carles (Linköping University, 2023)
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      This work is focused on the coupling of two complex models based on different underlying physics: a vapor compression refrigerating system and its electrical drive system. The main challenge was to correctly handle the ...

    • Detailed analysis of fin-and-tube evaporators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2009-09-17)
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      This paper is devoted to the presentation of a new model for fin-and-tube evaporators, focusing on the solid core simulation and its integration with a quasi-homogeneous two-phase flow model for the in-tube refrigerant ...