Ara es mostren els items 36-55 de 68

    • Manual de pràctiques de laboratori de Termodinàmica (v1) 

      Torras Ortiz, Santiago; Ablanque Mejía, Nicolás; Román Concha, Frida Rosario; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Calventus Solé, Yolanda (Universitat Politècnica de Catalunya, 2023)
      Exercici de pràctiques
      Accés obert
    • Minimization procedure of experimental tests for calibration purposes, within HVAC&R energy efficiency framework 

      Morales Ruíz, Sergio; Oliet Casasayas, Carles; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2019)
      Text en actes de congrés
      Accés obert
      Simulation models and predictive tools need to be fast, accurate and robust at the same time. The models that have to provide numerical solutions under transient conditions for a long period of time need to be simple with ...
    • Modular simulation of vapour compression systems with an object oriented tool 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The objective of this work is to simulate vapour compression refrigeration systems through a modular approach by means of an object - oriented numerical tool called NEST. For this purpose, the global system is modeled as ...
    • Numerical analysis of no-frost domestic refrigerator evaporators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Rigola Serrano, Joaquim (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The air-to-refrigerant evaporator placed in no-frost refrigerators is a critical component because of its simultaneous treatment of both cooler and freezer air streams, which implies a strong drying process on the cooler ...
    • Numerical analysis of parcel tracking in large eddy simulation of polydispersed multiphase flows: assessment of different parcel modeling techniques 

      Bahramian, Linda; Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In order to assess the impacts of parcel modeling, the Eulerian-Lagrangian method, by using the Particle-In-Cell model, is implemented for a three-dimensional polydispersed two-phase turbulent flow. First, the benchmark ...
    • Numerical and experimental analysis of air to water heat pumps 

      Oliet Casasayas, Carles; Sadurní Caballol, Alexandre; Ablanque Mejía, Nicolás; Rigola Serrano, Joaquim (International Energy Agency, 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In the present work a numerical and experimental analysis of a R134a air to water heat pump is carried out. A numerical model has been developed and implemented to predict the heat pump thermal and fluid-dynamic behavior. ...
    • Numerical and experimental study of absorption of H2O vapor in wavy falling film of LiBr aqueous solution in vertical tubes and in presence of non-absorbables 

      García Rivera, Eduardo; Castro González, Jesús; Farnós Baulenas, Joan; Oliet Casasayas, Carles (Elsevier, 2019-04-01)
      Article
      Accés obert
      One of the main reasons for the discrepancies between theoretical predictions of absorption phenomena made by mathematical models when they are compared against experimental results under real conditions, are the presence ...
    • Numerical assessment of parcel modeling in large eddy simulation for dispersed multiphase flows 

      Bahramian, Linda; Trias Miquel, Francesc Xavier; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2023)
      Text en actes de congrés
      Accés obert
      The particle-laden turbulent flow benchmark case of a confined jet by Hishida (1987) was selected for validation purposes of the Eulerian-Lagrangian method in Large Eddy Simulation (LES). After validation, a particle size ...
    • Numerical assessment of RANS and LES modelling in particle separation devices 

      Bahramian, Linda; Amani, Ahmad; Muela Castro, Jordi; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (European Conference for AeroSpace Sciences (EUCASS), 2022)
      Text en actes de congrés
      Accés obert
      In the present work, the separation efficiency analysis on particle-laden flows in the framework of LES and RANS modelling for an Inertial Particle Separator (IPS) device has been presented. The comparison of LES and RANS ...
    • Numerical Investigation on fluid flow of protruding branching duct in a dividing junction of a minichannel heat exchanger 

      Settati, Mohamed; Oliet Casasayas, Carles; Oliva Llena, Asensio (2021)
      Text en actes de congrés
      Accés obert
      This study focuses on investigating the effect of protruding branching duct on laminar fluid field in 90¿ dividing pipe junction of mini heat exchanger. The ducts under study, main and branch side, are of minichannel scale ...
    • Numerical Model of Capillary Tubes: Enhanced Performance and Study of Non-Adiabatic Effects 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Purdue University, 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In the present work a numerical model to simulate the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes is presented. It consists of an improved version of the distributed model detailed in Ablanque ...
    • Numerical modeling of simultaneous heat and moisture transfer under complex geometry for refrigeration purposes 

      Hou, Xiaofei; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (Université de Poitiers, 2012)
      Text en actes de congrés
      Accés obert
      The aim of the paper is to gain a better insight into heat and moisture transfer in refrigerator and to do fundamental study for water evaporation and condensation in refrigeration application. The governing transport ...
    • Numerical simulation of non-adiabatic capillary tubes. Special emphasis on the near-saturation zone 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2015-04-15)
      Article
      Accés obert
      The aim of this article is to present a distributed numerical model that simulates the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes. The resolution approach is based on a two-phase flow model ...
    • Numerical studies on passive vapor compression cycle regulating elements 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (International Institute of Refrigeration, 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The present work analyses the role of both the capillary tube and the low pressure accumulator on domestic refrigerators. The main goal is to provide a better insight on how the refrigerant flow is regulated by the capillary ...
    • Numerical study of falling film and bubble absorbers for small capacity NH3-H2O air-cooled absorption systems 

      Castro González, Jesús; Oliet Casasayas, Carles; Farnós Baulenas, Joan; Oliva Llena, Asensio (International Institute of Refrigeration, 2007)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      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 ...
    • On a Proper Tensor-Diffusivity Model for Large-Eddy Simulation of Buoyancy-Driven Turbulence 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliet Casasayas, Carles (Springer, 2020-03-26)
      Article
      Accés obert
      In this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ...
    • Optimization of a procedure for model calibration using a method based on scattered data interpolation 

      Morales Ruíz, Sergio; Oliet Casasayas, Carles; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (International Institute of Refrigeration, 2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In order to develop advanced control strategies for complex thermal systems such as in the case of refrigeration and air-conditioning systems, calibrated models against experimental measurements are necessary to reproduce ...
    • Parallel mesh multiplication and adaptation technique for turbulent flow simulation using unstructured meshes 

      Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliet Casasayas, Carles; Oliva Llena, Asensio (2015)
      Text en actes de congrés
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      In this paper, we report the development of a parallel mesh multiplication code to subdivide a base mesh (containing tetrahedral, pyramids, prisms or hexahedral) into a finer mesh without user intervention, taking care of ...
    • Power electronics high performance air-cooled heat sinks integrating graphite based materials 

      Oliet Casasayas, Carles; Mullen, David; Hoell, Klaus; Cochrane, Nathan; Preishuber-Pfluegl, Florian; Rigola Serrano, Joaquim; Bouton, Mathieu; Pontrucher, Marc; Castrillo Green, Pablo; Santos Serrano, Daniel; Schillaci, Eugenio; McKay, Connor; Halimic, Elvedin; Freismuth, Juergen (Purdue University, 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The thermal management of the power electronics cooling in the aircraft is getting more attention in the recent years due to the progressive implementation of electrical systems, especially in the framework of the more ...
    • Preliminary assessment of a polygeneration system based on a concentrated photovoltaic thermal (CPVT) solar collectors 

      Castro González, Jesús; Rigola Serrano, Joaquim; Kizildag, Deniz; Oliet Casasayas, Carles (Technishe Universität Berlin, 2021)
      Text en actes de congrés
      Accés obert
      ECOSun project has as main objective a cost reduction of electricity and heat co-generation via a Concentrated Photovoltaic/Thermal (CPV-T) system by applying low-cost materials and advanced industrial manufacturing methods. ...