Now showing items 21-37 of 37

    • 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)
      Conference report
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference lecture
      Restricted access - publisher's policy
      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 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)
      Conference lecture
      Restricted access - publisher's policy
      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
      Open Access
      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 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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
      Open Access
      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)
      Conference report
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      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 ...
    • 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
      Restricted access - publisher's policy
      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)
      Conference report
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      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)
      Conference report
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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 ...
    • Simulation of Household Refrigerators with a Flexible Numerical Tool 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (Purdue University, 2014)
      Conference report
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      This work presents a flexible numerical platform to simulate a whole household refrigeration unit taking into account both the refrigeration cycle itself and the refrigerated compartments network. The methodology implemented ...
    • Thermal System Oriented Simulation of Aircraft Electrical Environmental Control Systems Including its Electric Coupling 

      Ablanque Mejía, Nicolás; Torras Ortiz, Santiago; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (European Conference for AeroSpace Sciences (EUCASS), 2019)
      Conference report
      Open Access
      A flexible numerical platform based on libraries has been developed within the Dymola/Modelica framework to simulate Environmental Control Systems (ECS). The goal was to build up a flexible tool to analyse complex systems ...
    • Transient response in small capacity vapour compression systems. Experimental data and numerical approach 

      Ablanque Mejía, Nicolás; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Pérez Segarra, Carlos David (2011)
      Conference lecture
      Restricted access - publisher's policy
      The aim of this work is to introduce a numerical approach to study the transient response of vapour compression refrigerating systems. The emphasis is put on small capacity systems working with R600a (power consumption ...
    • Vapor Compression System Modelica Library for Aircraft ECS 

      Ablanque Mejía, Nicolás; Torras Ortiz, Santiago; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Purdue University, 2018)
      Conference report
      Restricted access - publisher's policy
      This work presents a Modelica library aimed to simulate vapor compression systems at both steady and transient conditions. The simulation of these specific systems is particularly challenging ...
    • Virtual household refrigerators at steady-state and transient conditions. Numerical model and experimental validation 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Purdue University, 2016)
      Conference report
      Restricted access - publisher's policy
      The current status of a flexible numerical model for vapor compression refrigeration systems for steady state and transient conditions is presented. The model simulates both the refrigeration cycle itself and the refrigerated ...