The present work has the objective of characterizing several coaxial heat exchanger geometries in an automotive cooling system and its effect on the performance coefficient, using R-134a as refrigerant by means of experimental tests. In the first instance, the experimental tests were carried out with different geometries of coaxial interchanges involved in the high-pressure line between the condenser and the expansion valve, as well as the low pressure line between the evaporator and the compressor, Between the volume of the exchanger and the coefficient of performance by means of a multifactorial analysis. The development of the research entails complying with parameters for the acquisition of experimental data and the development of an adequate experimental design. Statistical regressions were developed with R2 of 86.86% and a standard deviation of 2.2 for the low-pressure zone, while for the high pressure zone The regression determined a R2 of 95.17% and a standard deviation of 0.57. As for the COP and the T variables is statistically significant with a value of R2 of 99.97%, thus helping to design the heat exchangers to decrease fuel consumption in vehicles.
Index Terms— : IHX,COP, R-134a, Cooling cycle Automotive, heat exchangers
Este trabajo se realizó basado en la necesidad de evaluar resultados que estiman dos modelos termodinámicos mediante la comparación con datos experimentales; el objetivo de este trabajo es analizar la eficacia que poseen estos modelos para predecir parámetros como; potencia, torque y consumo de combustible de un M.C.I. Para lo cual se utilizó un vehículo para realizar pruebas experimentales de los parámetros mencionados en un dinamómetro automotriz; además se ejecutaron pruebas de emisión de gases con el fin de obtener las proporciones de aire/combustible que se desarrollan en el motor. Se desarrollaron los cálculos con los modelos mencionados, para elaborar las respectivas comparaciones. Finalmente se obtuvieron resultados de correlatividad que indican que los modelos matemáticos poseen buena capacidad para predecir parámetros de desempeño mecánico, en relación a los obtenidos en las pruebas experimentales. Por lo tanto se concluye que no es necesario aplicar ningún factor de corrección en estos modelos.
Palabras claves: Proceso Adiabático, Modelo CIMA, Modelo Otto, Motor de combustión interna alternativo (MCIA), Consumo de combustible, Dinamómetro de chasis, Rendimiento volumétrico, Potencia en el motor, Torque en el motor, EES (Software).
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