dc.contributor.advisor Benítez-Rodríguez, Jaime dc.contributor.author Pérez-Reisler, Rafael A. dc.date.accessioned 2018-08-09T14:18:50Z dc.date.available 2018-08-09T14:18:50Z dc.date.issued 2007 dc.identifier.uri https://hdl.handle.net/20.500.11801/774 dc.description.abstract Most of the models to predict the heat and mass transfer in vertical absorption chillers underestimate the heat and mass transfer coefficients. Generally the models put too many constraints such as: laminar profile, constant properties, non-absorbable gases are ignored. This investigation attempts to create a more realistic model to estimate the air-cooled absorption process. The model couples the energy and mass balance equations through constraint equations at the interface. Using a method for computing the thermodynamic properties from a Gibbs free energy equation and correlations to estimate the transport properties, a robust MathCad routine was created that computes the solution composition and temperature as functions of the vertical position in the tube. The results from the model show that increasing the air content from 1 to 20% by volume reduces the mass absorption flux by 43%. Furthermore, it suggests that there is a critical tube length that depends on the air concentration at which the absorption process ceases (1.3-m for 1% air). en_US dc.description.abstract La mayoría de los modelos existentes para predecir los efectos de transferencia de calor y masa en procesos de refrigeración por absorción subestiman los efectos de éstos. Generalmente los modelos restringen demasiado el fenómeno con asunciones tales como: flujo laminar, propiedades constantes, no consideran gases no-condensables. Esta investigación intenta crear un modelo más real del fenómeno de absorción enfriado por aire. Usando un método para calcular las propiedades termodinámicas a partir de la energía libre de Gibbs y usando correlaciones para estimar las propiedades de transporte de la solución, se desarrolló un programa robusto en MathCad que calcula la composición y la temperatura de la solución como función de la posición en el tubo vertical. Los resultados del modelo muestran que incrementar el contenido de aire de 1% a 20% por volumen tiene un efecto de reducir el flujo másico de absorción en un 43%. Además, sugieren que existe un largo crítico de tubo que depende de la concentración de aire, al cual el proceso de absorción cesa (1.3-m para 1% de aire). en_US dc.language.iso en en_US dc.subject heat en_US dc.subject.lcsh Tubes--Thermodynamics. en_US dc.subject.lcsh Heat--Transmission. en_US dc.subject.lcsh Cooling. en_US dc.subject.lcsh Mass transfer. en_US dc.title Heat and mass transfer effects in air-cooled vertical tube absorbers en_US dc.type Thesis en_US dc.rights.license All rights reserved en_US dc.rights.holder (c) 2007 Rafael A. Pérez Reisler en_US dc.contributor.committee Venkataraman, Nellore dc.contributor.committee Rodríguez, Francisco dc.contributor.representative Villafañe, Gilberto thesis.degree.level M.S. en_US thesis.degree.discipline Mechanical Engineering en_US dc.contributor.college College of Engineering en_US dc.contributor.department Department of Mechanical Engineering en_US dc.description.graduationYear 2007 en_US
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