Oliet Casasayas, Carles
Total activity: 235
Research group
Heat and Mass Transfer Technological Center (CTTC)
Department
Department of Heat Engines
E-mail
carlescttc.upc.edu
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  • Three-dimensional numerical simulation of fluid flow and heat transfer in fin-and-tube heat exchangers at different flow regimes  Open access

     Paniagua Sánchez, Leslye
    Department of Heat Engines, Universitat Politècnica de Catalunya
    Theses

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    Esta tesis tiene como objetivo unificar dos ramas de trabajo dentro del Centro Tecnológico de Transferencia de Calor (CTTC). Por un lado, se ha realizado un amplio trabajo experimental durante los últimos años. Este trabajo experimental se ha complementado con modelos numéricos para el estudio de intercambiadores de calor de tipo aleta-tubo. Tales modelos numéricos pueden considerarse una herramienta numérica de bajo coste empleada con propósitos de diseño principalmente. Por otro lado, los científicos que trabajan en el centro han desarrollado con éxito un código de Dinámica de Fluidos Computacionales (TermoFluids). Este código de alto rendimiento ha sido ampliamente utilizado principalmente para predecir flujos complejos de gran interés académico. La idea de unir a estas dos ramas, proviene de la necesidad de una plataforma numérica fiable con datos locales propios del flujo y de la transferencia de calor en diversas aplicaciones de intercambiadores de calor. Ser capaz de generar coeficientes locales de transferencia de calor para abastecer con datos propios los modelos existentes de bajo coste, permitirá la correcta predicción del rendimiento de dichos dispositivos.Para lograr estos objetivos, se han hecho varias contribuciones al código TermoFluids que está en continua evolución. Algunas de las mayores cuestiones que se plantean implican la generación de mallas adecuadas y asequibles, la implementación y validación de la condición de contorno periódica tridimensional y el acoplamiento de los diferentes dominios para el estudio de casos con diferentes comportamientos físicos, como desarrollo transitorio e inercia térmica. La turbulencia está presente en la mayoría de los flujos de ingeniería, y los intercambiadores de calor de evaporadores para refrigeración no son una excepción. La presencia de muchos tubos (que actúan como obstáculos para el fluido) colocados en diferentes configuraciones y el hecho de que el flujo también está confinado por aletas, crean características de flujo tridimensionales complejas que tienen generalmente régimen turbulento o en transición. Por lo tanto, se analiza la convección forzada turbulenta en una matriz de pines delimitados por paredes. simulando las grandes escalas de turbulencia y modelando las pequeñas (LES) con el fin de evaluar el desempeño de los tres modelos seleccionados, a saber WALE, QR y VMS. Los números de Reynolds establecidos para el estudio son 3000, 10000 y 30000. Algunos de los principales resultados que se incluyen son el coeficiente de presión alrededor los cilindros, el número de Nusselt promedio en las paredes y la vorticidad del flujo. La parte final de la tesis se dedica a estudiar el flujo tridimensional y los parámetros de transferencia de calor encontrados en un intercambiador de calor de tipo aleta-tubo utilizado para la refrigeración doméstica en equipos de 'no-escarcha'. Las implementaciones del código y el postproceso numéricos se validan en un caso muy similar para un intercambiador de calor con dos filas de tubos a bajos Reynolds para el cual se dispone de datos experimentales. El siguiente análisis que se presenta es una configuración típica para evaporadores 'no-escarcha' con paso de aleta doble (para el que se tiene muy poca información numérica en la literatura). Se considera el acoplamiento conjugado de la transferencia de calor convectiva entre fluido y sólido y conductiva dentro de la aleta. La influencia de algunos parámetros geométricos y de régimen de flujo se analizan con propósitos de diseño. En conclusión, las contribuciones generales de esta tesis junto con el código computacional ya existente, ha demostrado ser capaz de realizar con éxito simulaciones tridimensionales para predecir las características del flujo y los mecanismos responsables de la transferencia de calor en intercambiadores de calor de tipo aleta-tubo.

    This thesis aims at unifying two distinct branches of work within the Heat Transfer Technological Center (CTTC). On one side, extensive experimental work has been done during the past years by the researchers of the laboratory. This experimental work has been complemented with numerical models for the calculation of fin and tube heat exchangers thermal and fluid dynamic behavior. Such numerical models can be referred to as fast numerical tool which can be used for industrial rating and design purposes. On the other hand, the scientists working at the research center have successfully developed a general purpose multi-physics Computational Fluid Dynamics (CFD) code (TermoFluids). This high performance CFD solver has been extensively used by the co-workers of the group mainly to predict complex flows of great academic interest. The idea of bringing together this two branches, comes from the necessity of a reliable numerical platform with detailed local data of the flow and heat transfer on diverse heat exchanger applications. Being able to use local heat transfer coefficients as an input on the rating and design tool will lead to affordable and accurate prediction of industrial devices performance, by which the center can propose enhanced alternatives to its industrial partners. To accomplish these goals, several contributions have been made to the existing TermoFluids software which is in continuous evolution in order to meet the competitive requirements. The most significant problematics to adequately attack this problem are analyzed and quite interesting recommendations are given. Some of the challenging arising issues involve the generation of suitable and affordable meshes, the implementation and validation of three dimensional periodic boundary condition and coupling of different domains with important adjustments for the study of cases with different flow physics like time steps and thermal development. Turbulence is present in most of engineering flows, and refrigeration evaporator heat exchangers are not an exception. The presence of many tubes (acting like bluff bodies for the flow) arranged in different configurations and the fact that the flow is also confined by fins, create complex three dimensional flow features that have usually turbulent or transition to turbulent regime. Therefore, three dimensional turbulent forced convection in a matrix of wall-bounded pins is analyzed. Large Eddy Simulations (LES) are performed in order to assess the performance of three different subgrid-scale models, namely WALE, QR and VMS. The Reynolds numbers of the study were set to 3000, 10000 and 30000. Some of the main results included are the pressure coefficient around the cylinders, the averaged Nusselt number at the endwalls and vorticity of the flow. The final part of the thesis is devoted to study the three dimensional fluid flow and conjugated heat transfer parameters encountered in a plate fin and tube heat exchanger used for no-frost refrigeration. The numerical code and post processing tools are validated with a very similar but smaller case of a heat exchanger with two rows of tubes at low Reynolds for which experimental data is available. The next analysis presented is a typical configuration for no-frost evaporators with double fin spacing (for which very few numerical data is reported in the scientific literature). Conjugated convective heat transfer in the flow field and heat conduction in the fins are coupled and considered. The influence of some geometrical and flow regime parameters is analyzed for design purposes. In conclusion, the implementations and general contributions of the present thesis together with the previous existent multi-physics computational code, has proved to be capable to perform successful top edge three dimensional simulations of the flow features and heat transfer mechanisms observed on heat exchanger devices.

    Esta tesis tiene como objetivo unificar dos ramas de trabajo dentro del Centro Tecnológico de Transferencia de Calor (CTTC). Por un lado, se ha realizado un amplio trabajo experimental durante los últimos años. Este trabajo experimental se ha complementado con modelos numéricos para el estudio de intercambiadores de calor de tipo aleta-tubo. Tales modelos numéricos pueden considerarse una herramienta numérica de bajo coste empleada con propósitos de diseño principalmente. Por otro lado, los científicos que trabajan en el centro han desarrollado con éxito un código de Dinámica de Fluidos Computacionales (TermoFluids). Este código de alto rendimiento ha sido ampliamente utilizado principalmente para predecir flujos complejos de gran interés académico. La idea de unir a estas dos ramas, proviene de la necesidad de una plataforma numérica fiable con datos locales propios del flujo y de la transferencia de calor en diversas aplicaciones de intercambiadores de calor. Ser capaz de generar coeficientes locales de transferencia de calor para abastecer con datos propios los modelos existentes de bajo coste, permitirá la correcta predicción del rendimiento de dichos dispositivos. Para lograr estos objetivos, se han hecho varias contribuciones al código TermoFluids que está en continua evolución. Algunas de las mayores cuestiones que se plantean implican la generación de mallas adecuadas y asequibles, la implementación y validación de la condición de contorno periódica tridimensional y el acoplamiento de los diferentes dominios para el estudio de casos con diferentes comportamientos físicos, como desarrollo transitorio e inercia térmica. La turbulencia está presente en la mayoría de los flujos de ingeniería, y los intercambiadores de calor de evaporadores para refrigeración no son una excepción. La presencia de muchos tubos (que actúan como obstáculos para el fluido) colocados en diferentes configuraciones y el hecho de que el flujo también está confinado por aletas, crean características de flujo tridimensionales complejas que tienen generalmente régimen turbulento o en transición. Por lo tanto, se analiza la convección forzada turbulenta en una matriz de pines delimitados por paredes. simulando las grandes escalas de turbulencia y modelando las pequeñas (LES) con el fin de evaluar el desempeño de los tres modelos seleccionados, a saber WALE, QR y VMS. Los números de Reynolds establecidos para el estudio son 3000, 10000 y 30000. Algunos de los principales resultados que se incluyen son el coeficiente de presión alrededor los cilindros, el número de Nusselt promedio en las paredes y la vorticidad del flujo. La parte final de la tesis se dedica a estudiar el flujo tridimensional y los parámetros de transferencia de calor encontrados en un intercambiador de calor de tipo aleta-tubo utilizado para la refrigeración doméstica en equipos de 'no-escarcha'. Las implementaciones del código y el postproceso numéricos se validan en un caso muy similar para un intercambiador de calor con dos filas de tubos a bajos Reynolds para el cual se dispone de datos experimentales. El siguiente análisis que se presenta es una configuración típica para evaporadores 'no-escarcha' con paso de aleta doble (para el que se tiene muy poca información numérica en la literatura). Se considera el acoplamiento conjugado de la transferencia de calor convectiva entre fluido y sólido y conductiva dentro de la aleta. La influencia de algunos parámetros geométricos y de régimen de flujo se analizan con propósitos de diseño. En conclusión, las contribuciones generales de esta tesis junto con el código computacional ya existente, ha demostrado ser capaz de realizar con éxito simulaciones tridimensionales para predecir las características del flujo y los mecanismos responsables de la transferencia de calor en intercambiadores de calor de tipo aleta-tubo

  • Centre Tecnològic de Transferència de Calor

     Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Capdevila Paramio, Roser; Ablanque Mejia, Nicolas; Lehmkuhl Barba, Oriol; Carmona Muñoz, Angel; Sadurni Caballol, Alexandre; Kizildag, Deniz; Giraldez Garcia, Hector; Chiva Segura, Jorge; Baez Vidal, Aleix; Lopez Mas, Joan; Farnos Baulenas, Joan; Torras Ortiz, Santiago; Balcazar Arciniega, Nestor Vinicio; Martinez Valdivieso, Daniel; Jofre Cruanyes, Lluís; Calafell Sandiumenge, Joan; Estruch Perez, Olga; Muela Castro, Jordi; Ventosa Molina, Jordi; Aizpurua Udabe, Imanol; Schillaci, Eugenio; Favre, Federico; Zhang, Hao; Aljure Osorio, David E.; Morales Ruiz, Sergio; Borrell Pol, Ricard; Galione Klot, Pedro Andres; Dabbagh, Firas; Oyarzun Altamirano, Guillermo; Gorobets, Andrei; Oliva Llena, Asensio
    Competitive project

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  • REtrofitting Solutions and Services for the enhancement of Energy Efficiency in Public Edification

     Oliva Llena, Asensio; Oliet Casasayas, Carles; Kizildag, Deniz; Ablanque Mejia, Nicolas; Rigola Serrano, Joaquim
    Competitive project

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  • Experimental studies of fin-and-tube evaporators for household no-frost refrigerators

     Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Perez Segarra, Carlos David; Sadurní, Alexandre
    World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics
    Presentation's date: 2013-06-17
    Presentation of work at congresses

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  • Numerical simulation and experimental validation of sensible heat accumulators oriented to zero energy buildings

     Oliet Casasayas, Carles; Torras Ortiz, Santiago; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim
    REHVA World Congress
    Presentation's date: 2013-06
    Presentation of work at congresses

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    The sensible heat accumulation is an efficient and low-cost way of storing thermal energy for its direct or indirect reutilization in typical building processes as space heating and sanitary hot water generation. The authors are developing both numerical and experimental tools for the study and optimisation of this kind of systems, focusing on the analysis of a specific sensible heat accumulator based on a cylindrical tank with an internal coiled pipe. The numerical simulation has been performed using a high-level platform that links two codes to solve the system. The fluid inside the tank is solved with a CFD&HT (Computational Fluid Dynamics & Heat Transfer) software called TermoFluids and the fluid flow inside the pipe is solved considering a quasi-homogenous fully-implicit one-dimensional model, where the governing equations are discretized along the whole tube domain. The resolution of the pipe wall in a detailed way couples both fluid solvers. On the other hand, an experimental infrastructure has been developed for the analysis of the system, which has been instrumented to provide detailed information of its heat storage capacity and temperature map. Several temperature sensors are incorporated in the heat accumulator at different heights and radius inside the tank. For the internal flow, the mass flow rate is measured, as well as the inlet and outlet temperatures. Different internal flow rates and operational temperatures have been studied both numerically and experimentally. From the results obtained it can be said that the device shows interesting heat storage capacities, while the numerical platform shows promising comparison results against the experiments.

  • Máquina de absorción refrigerada por aire

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Alba Queipo, Ramiro; Ordoño Martinez, Manuel Miguel; Farnos Baulenas, Joan
    Date of request: 2013-06-14
    Invention patent

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  • Acumulador de energía térmica en base a materiales de cambio de fase sólido-líquido y método de fabricación de la unidad

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Alba Queipo, Ramiro; Ordoño Martinez, Manuel Miguel; Morales Ruiz, Sergio
    Date of request: 2013-03-01
    Invention patent

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  • Sistema de almacenamiento de energía térmica combinando material sólido de calor sensible y material de cambio de fase

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Galione Klot, Pedro Andres
    Date of request: 2012-12-27
    Invention patent

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    Un sistema para el almacenamiento y recuperación de energía térmica empleando como medio al menos un material de cambio de fase (sólido-líquido) y un material sólido de calor sensible que se encargan de almacenar/recuperar el calor obtenido desde una fuente externa en forma de calor sensible y calor latente de cambio de fase. Dichos materiales están debidamente contenidos en un único tanque, en cuyo interior existen al menos dos zonas, cada una conteniendo un material diferente, y diferenciadas por el rango de temperaturas a las que son sometidas. La configuración más usada consiste en tres diferentes zonas configuradas al interior del tanque: zona caliente, en la parte superior del tanque, donde un material de cambio de fase encapsulado caracterizado por una temperatura de fusión alta está encerrado; zona fría, ubicada en la parte inferior, donde un material de cambio de fase con baja temperatura de fusión está colocado; y una zona media, que contiene un material sólido de calor sensible.

  • Flow and heat transfer in a wall-bounded pin matrix

     Paniagua Sánchez, Leslye; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Perez Segarra, Carlos David
    International Symposium on Turbulence, Heat and Mass Transfer
    Presentation's date: 2012-09-26
    Presentation of work at congresses

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  • Numerical Analysis and Experimental Studies of Vapour Compression Refrigerating Systems. Special Emphasis on Different Cycle Configurations  Open access

     Sadurni Caballol, Alexandre
    Department of Heat Engines, Universitat Politècnica de Catalunya
    Theses

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    The aim of this work is to study the thermal behavior and fluid-dynamic systems, vapor compression refrigeration and its components (heat exchangers, expansion devices, compressors, connecting pipes, pumps and pressure vessels). Topics discussed throughout this thesis arise from the growing interest in refrigerants friendly environment as well as different types of cooling systems for vapor compression has motivated the research group of the CTTC (Centre for Heat Transfer Technology ) to carry out major research efforts as well as participate in several projects with national and European institutions. The information contained in this thesis represents a summary of work performed by the author in recent years but also includes many of the contributions made by other members of CTTC. This thesis has led to the publication of several articles in international conferences. The main achievement of this thesis was the development of a numerical tool based on several subroutines flexibility to study different cooling Systemas vapor compression. The entire digital infrastructure has been the result of attaching specific numerical resolutions of each element of the cycle with the overall resolution algorithm. The simulations have been oriented to the study of thermodynamic cycle as well as to study some relevant aspects of the elements. In addition to the numerical results has been carried out important experimental work in the CTTC facilities in order to validate numerical models. The author has been fully involved in the process of data acquisition and has collaborated in the development of the units. The thesis is structured into five chapters plus a final conclusions and future actions. The first chapter, the introduction puts the reader in regard to the problematic situation, the history of cooling and objectives. The second presents the mathematical formulation and numerical methodology used in the simulation of the different elements and all cooling systems. The third study presents the numerical code verification. The fourth focuses on the validation of models with experimental results. And finally the fifth presents a suite of parametric studies and analysis. The numerical simulation code implemented has proven to be a flexible tool as various aspects of the steam compression systems have been successfully simulated and studied. It has also proven a reliable and good level of accuracy as the numerical results have been simulated properly the various experimental data compared.

  • Modular simulation of vapour compression systems with an object oriented tool

     Ablanque Mejia, Nicolas; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Perez Segarra, Carlos David
    International Referigeration and Air Conditioning
    p. 2377, 1-2377, 8
    Presentation's date: 2012-07-16
    Presentation of work at congresses

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    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 a collection of different elements which are linked between them. Each element represents a specific part of the system (e.g. heat exchanger, compressor, expansion device, tube, cavity, wall, etc.) and can be independently solved for given boundary conditions. The global resolution procedure is carried out by solving all the elements iteratively, transferring information between them, until a converged solution is reached. The system is easily modified by adding, subtracting or substituting any of its elements. This feature gives great flexibility to the model, not only because the configuration of the system can be clearly altered, but also because the numerical model of any element can be easily replaced allowing different levels of simulation. In this work the object - oriented methodology together with the elements description and their resolution procedures are presented. The model is validated against experimental data obtained from a refrigeration cycle working with isobutane. In addition to this, an illustrative case is presented in order to show the system capabilities.

  • Analysis of refrigerating cycles working with isobutane under transient conditions

     Ablanque Mejia, Nicolas; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Perez Segarra, Carlos David
    IIR-Gustav Lorentzen Conference on Natural Working Fluids
    p. 1 (928)-8 (935)
    Presentation's date: 2012-06-26
    Presentation of work at congresses

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  • SEILA E2.1.4 Modelo de simulación sistema alternativo

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2012
    Report

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  • SEILA E2.1.5 Resultados estudio del comportamiento térmico

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2012
    Report

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  • SEILA E2.1.6 Resultados de evaluación del sistema de recuperación de energía

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2012
    Report

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  • SEILA E2.1.8 Informe de evaluación de las mejoras en el diseño

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2012
    Report

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  • SIMULACION NUMERICA Y VALIDACION EXPERIMETNAL DE FENOMENOS DE CAMBIO DE FASE LIQUIDO-VAPOR

     Castro Gonzalez, Jesus; Lopez Mas, Joan; Ablanque Mejia, Nicolas; Oliet Casasayas, Carles; Rigola Serrano, Joaquim
    Competitive project

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  • SEILA E2.1.7 Resultados de evaluación del sistema no convencional

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2012
    Report

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  • 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; Perez Segarra, Carlos David
    European Thermal Sciences Conference
    p. 1-9
    DOI: 10.1088/1742-6596/395/1/012178
    Presentation's date: 2012
    Presentation of work at congresses

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    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 equations (continuity, momentum, energy and concentration equations) in 3D Cartesian coordinates are firstly introduced. As the mixed convection is simulated in the paper, buoyancy forces caused by both temperature and concentration gradient are considered and are also included in momentum equation. Numerical results are carried out by using Termofluids code. The pressure-velocity linkage is solved by means of an explicit finite volume fractional step procedure. In order to validate the code, a humid air flowing in a horizontal 3D rectangular duct case is carried out and compared with the published numerical and experimental results. The contour of temperature and vapor density of air at a cross section is provided and analyzed. Finally, the heat and mass transfer process during the moist air flow through complicated geometry is simulated and temperature and humidity distributions are obtained.

  • Transient response in small capacity vapour compression systems. Experimental data and numerical approach

     Ablanque Mejia, Nicolas; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Perez Segarra, Carlos David
    IIR International Congress of Refrigeration
    p. 1-8
    Presentation's date: 2011-08-21
    Presentation of work at congresses

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    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 lower than 1 kW). The proposed method consists in linking all the specific sub-models of the cycle main components (compressor, heat exchangers and expansion device) and transferring adequate information from one to each other until convergence is reached. The model allows to simulate both steadystate and transient conditions. In order to validate the numerical scheme, an experimental facility (specially designed to analyze domestic refrigerators) has been built and used to collect relevant measurements. The work is focused on a specific case considering domestic refrigerating conditions at both steady-state and transient conditions. The numerical steady-state conditions are compared against experimental data, while a detailed transient process is numerically studied.

  • Numerical analysis of no-frost domestic refrigerator evaporators

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Oliva Llena, Asensio; Rigola Serrano, Joaquim
    IIR International Congress of Refrigeration
    p. 1-8
    Presentation's date: 2011-08-21
    Presentation of work at congresses

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    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 air flow, and the corresponding intense and non-uniform frost formation process. This paper presents a numerical model developed to analyse fin-and-tube heat exchangers in general and this kind of evaporators in particular. This is a distributed model which gives a very detailed picture of the nonuniform heat exchanger behaviour in terms of heat and mass transfer, considering local effects (frost formation, fin density, in-flow state, etc.). The mathematical formulation and the numerical methodology are presented, showing the model capabilities and level of analysis. Afterwards, illustrative computational results show the potential of the model as a design tool for this application. Validation studies are included in an accompanying paper.

  • Analysis of vapour-compression refrigerating systems

     Sadurni Caballol, Alexandre; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Perez Segarra, Carlos David
    IIR International Congress of Refrigeration
    p. 1-8
    Presentation's date: 2011-08-21
    Presentation of work at congresses

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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 levels of simulation for some elements (compressors, pipes, etc.) as well as the possibility of use different kind of expansion devices. A verification study for a steady state regime is presented analysing also influence of mesh density and of the numerical accuracy. A validation study for steady state regime is shown. Some computational results for steady state regime are also presented to provide an overview of the level of detail given by the model. A set of parametric studies is finally given to evaluate the influence of some boundary conditions (environmental temperature, secondary inlet temperatures, etc.).

  • Experimental analysis of no-frost domestic refrigerator evaporators

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Oliva Llena, Asensio; Rigola Serrano, Joaquim
    IIR International Congress of Refrigeration
    p. 1-8
    Presentation's date: 2011-08-21
    Presentation of work at congresses

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    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 air flow, and the corresponding intense and non-uniform frost formation process. This paper presents a numerical model developed to analyse fin-and-tube heat exchangers in general and this kind of evaporators in particular. This is a distributed model which gives a very detailed picture of the nonuniform heat exchanger behaviour in terms of heat and mass transfer, considering local effects (frost formation, fin density, in-flow state, etc.). The mathematical formulation and the numerical methodology are presented, showing the model capabilities and level of analysis. Afterwards, illustrative computational results show the potential of the model as a design tool for this application. Validation studies are included in an accompanying paper.

  • SEILA E2.1.1 Especificaciones de diseño

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2011
    Report

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  • SEILA E2.1.2 Modelo dinámico

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2011
    Report

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  • SEILA E2.1.3 Resultados modelización actual

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Oliva Llena, Asensio; Sadurni Caballol, Alexandre
    Date: 2011
    Report

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  • Q-00005

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Castro Gonzalez, Jesus; Rodriguez Pérez, Ivette Maria; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Soria Guerrero, Manel; Torrades Carné, Francesc; Codina Macià, Esteban; Khamashta Shahin, Munir; Rigola Serrano, Joaquim
    Competitive project

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  • Q-00019

     Oliva Llena, Asensio; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Perez Segarra, Carlos David
    Competitive project

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  • Q-00011

     Rodriguez Pérez, Ivette Maria; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Torrades Carné, Francesc; Oliet Casasayas, Carles; Farnos Baulenas, Joan; Oliva Llena, Asensio
    Competitive project

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  • Q-00006

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Calventus Sole, Yolanda; Puig Montada, Ana M.; Rodriguez Pérez, Ivette Maria; Colomer Vilanova, Pere; Castro Gonzalez, Jesus
    Competitive project

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  • Q-00025

     Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio
    Competitive project

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  • Numerical study of air inside refrigerating compartment of frost-free domestic refrigerators

     Jaramillo Ibarra, Julian Ernesto; Rigola Serrano, Joaquim; Perez Segarra, Carlos David; Oliet Casasayas, Carles
    International Refrigeration and Air Conditioning Conference (PURDUE)
    p. 1-8
    Presentation's date: 2010-07-13
    Presentation of work at congresses

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

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Oliva Llena, Asensio
    International Refrigeration and Air Conditioning Conference (PURDUE)
    p. 1-8
    Presentation's date: 2010-07-13
    Presentation of work at congresses

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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 fin-and-tube evaporators, together with a short description of the numerical tools developed. The first preliminary experimental results using single-phase coolants are then given together with their numerical counterparts. The numerical results are presented in detail in order to both complementing the experimental information obtained, and to show its potential as an analysis and design tool.

  • Sistemas de refrigeració doméstica modulares y de alta energética

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim
    Competitive project

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  • SEILA E1.1.3 Informe priorizado tecnologías emergentes

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2010
    Report

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  • SEILA E1.1.2 Informe estado del arte tecnologías futuras

     Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Torras Ortiz, Santiago; Morales Ruiz, Sergio; Galione Klot, Pedro Andres; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2010
    Report

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  • Detailed analysis of fin-and-tube evaporators

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Oliva Llena, Asensio
    Conferência Nacional em Mecânica de Fluidos, Termodinâmica e Energia
    p. 99-100
    Presentation's date: 2009-09-17
    Presentation of work at congresses

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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 flow. Special attention is dedicated to separated in-tube flow patterns (stratified, stratified-wavy), because of their importance in liquid overfeed evaporators and the impact on the solid core temperature distribution. The paper presents the solid core formulation and numerical method, the intube two-phase flow model, and describes the proposed integration algorithm between them. A selected single-tube case is analysed in full detail, showing the impact of stratified flow on the fin and tube temperature distributions. Additional studies are finally presented on fin-tube contact aspects as thermal contact resistance and partial contact.

  • CENTRE TECNOLOGIC TRANSFERENCIA CALOR

     Sadurni Caballol, Alexandre; Rigola Serrano, Joaquim; Perez Segarra, Carlos David; Trias Miquel, Francesc Xavier; Morales Ruiz, Sergio; Jaramillo Ibarra, Julian Ernesto; Capdevila Paramio, Roser; Rodriguez Pérez, Ivette Maria; Soria Guerrero, Manel; Lopez Mas, Joan; Torras Ortiz, Santiago; Carmona Muñoz, Angel; Oliet Casasayas, Carles; Castro Gonzalez, Jesus; Lehmkuhl Barba, Oriol; Ablanque Mejia, Nicolas; Kizildag, Deniz; Borrell Pol, Ricard; Gorobets, Andrey; Mohan Damle, Rashmin; Oliva Llena, Asensio
    Competitive project

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  • SIMULACION NUMERICA Y VALIDACION EXPERIMENTAL DE FENOMENOS DE CAMBIO DE FASE DE LIQUIDO-VAPOR. APLICACION A SISTEMAS Y EQUIPOS TERMI

     Oliet Casasayas, Carles; Castro Gonzalez, Jesus; Lopez Mas, Joan; Ablanque Mejia, Nicolas; Rigola Serrano, Joaquim
    Competitive project

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  • DESARROLLO DE SUPERFICIES DE TRANSFERENCIA DE CALOR AVANZADAS EN INTERCAMBIADORES DE CALOR COMPACTOS DE TUBOS Y ALETAS. APLICACIÓN A

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Castro Gonzalez, Jesus
    Competitive project

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  • Application of Air Curtains in Refrigerated Chambers

     Oliet Casasayas, Carles
    International Refrigeration and Air Conditioning Conference (PURDUE)
    Presentation's date: 2008-07-14
    Presentation of work at congresses

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  • Fin-and-tube Heat Exchanger Solid Core Advanced Simulation

     Oliet Casasayas, Carles
    International Refrigeration and Air Conditioning Conference (PURDUE)
    Presentation's date: 2008-07-14
    Presentation of work at congresses

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  • Experimental Results on PPUCH Fin-and-Tube Heat Exchangers

     Oliet Casasayas, Carles; Perez Segarra, Carlos David; Sadurni Caballol, Alexandre; Oliva Llena, Asensio
    Date: 2008-07
    Report

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  • Detailed Unsteady Simulation of Liquid Overfeed Refrigerating Systems

     Oliet Casasayas, Carles
    International Refrigeration and Air Conditioning Conference (PURDUE)
    Presentation's date: 2008-07-14
    Presentation of work at congresses

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  • Proyecto FERASOL. Informe de seguimiento año 2007

     Castro Gonzalez, Jesus; Rigola Serrano, Joaquim; Oliet Casasayas, Carles
    Date: 2008-04
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  • Application of Air Curtains in Refrigerated Chambers

     Jaramillo Ibarra, Julian Ernesto; Oliva Llena, Asensio; Perez Segarra, Carlos David; Oliet Casasayas, Carles
    International Refrigeration and Air Conditioning Conference (PURDUE)
    p. 1-8
    Presentation of work at congresses

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  • Numerical simulation of two-phase flow in multiple T-junctions

     Ablanque Mejia, Nicolas; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Perez Segarra, Carlos David
    8th IIR Gustav Lorentzen Natural Working Fluids Conference
    p. 201-208
    Presentation of work at congresses

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  • Estudi experimental càmara TRIPOSONA C-12

     Oliet Casasayas, Carles; Sadurni Caballol, Alexandre; Perez Segarra, Carlos David
    Date: 2008-01
    Report

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  • Detailed Unsteady Simulation of Liquid Overfeed Refrigerating Systems

     Sadurni Caballol, Alexandre; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Perez Segarra, Carlos David
    International Refrigeration and Air Conditioning Conference (PURDUE)
    p. 1-8
    Presentation of work at congresses

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