Thesis MODELACIÓN COMPUTACIONAL DE MEZCLAS ZEOTRÓPICAS DURANTE LA TRANSFERENCIA DE CALOR EN ESTADO DE EVAPORACIÓN
Date
2019
Authors
RAMOS CARRASCO, PAULINA
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Abstract
En la actualidad los refrigerantes tienen efectos perjudiciales en la capa de ozono y efecto invernadero, es por esto, que se estudian nuevos tipos de mezclas refrigerantes, con el objetivo de disminuir estos efectos. Los ciclos de refrigeración JT han presentado un aumento de la eficiencia al utilizar este tipo de mezclas, pueden operar de forma eficiente en rangos de temperatura de enfriamiento de 80-230 K y son utilizadas en muchas aplicaciones como enfriamiento de sensores infrarrojos, de gas o licuefacción, criocirugía, crio preservación, entre otros. Se realiza un análisis para diversas composiciones, considerando temperatura constante en la pared para un flujo anular, desarrollando una metodología de cálculo programada en MATLAB, obteniendo la distribución de velocidad y temperatura en el eje radial, y los coeficientes de transferencia de calor locales, comparándolos con los obtenidos por (Barraza, Measured and predicted heat transfer coefficients for boiling zeotropic mixed refrigerants in horizontal tubes., 2016)
At present, refrigerants have detrimental effects on the ozone layer and the greenhouse effect, which is why new types of refrigerant mixtures are studied, with the aim of reducing these effects. The JT refrigeration cycles have shown an increase in efficiency when using this type of mixtures, they can operate efficiently in cooling temperature ranges of 80-230 K and are used in many applications such as cooling of infrared, gas or gas sensors, liquefaction, cryosurgery, cryo preservation, among others. An analysis is made for different compositions, considering constant temperature in the wall for an annular flow, developing a calculation methodology programmed in MATLAB, obtaining the distribution of speed and temperature in the radial axis, and the local heat transfer coefficients, comparing them with those obtained by (Barraza, Measured and predicted heat transfer coefficients for boiling zeotropic mixed refrigerants in horizontal tubes., 2016)
At present, refrigerants have detrimental effects on the ozone layer and the greenhouse effect, which is why new types of refrigerant mixtures are studied, with the aim of reducing these effects. The JT refrigeration cycles have shown an increase in efficiency when using this type of mixtures, they can operate efficiently in cooling temperature ranges of 80-230 K and are used in many applications such as cooling of infrared, gas or gas sensors, liquefaction, cryosurgery, cryo preservation, among others. An analysis is made for different compositions, considering constant temperature in the wall for an annular flow, developing a calculation methodology programmed in MATLAB, obtaining the distribution of speed and temperature in the radial axis, and the local heat transfer coefficients, comparing them with those obtained by (Barraza, Measured and predicted heat transfer coefficients for boiling zeotropic mixed refrigerants in horizontal tubes., 2016)
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Keywords
REFRIGERACION Y REFRIGERADORES , CALOR TRANSMISION , EVAPORACION