Néstor Fonseca Díaz

ESTUDIO DEL PROCESO DE ACONDICIONAMIENTO DE AIRE MEDIANTE SALES DISECANTES EN APLICACIONES HVAC/R

Este articulo presenta los resultados del estudio realizado como parte del analisis preliminar sobre el proceso de deshumidificacion de aire mediante sales disecantes en climatizacion de recintos. El objetivo de este analisis es poder aplicar esta tecnica en Colombia y paises con condiciones climaticas similares. Se describen los diferentes procesos de deshumectacion del aire, de igual manera los tipos de sales disecantes mas utilizados y sus propiedades, los diferentes procesos en que se pueden aplicar, los componentes y sistemas de funcionamiento en este tipo de aplicaciones.

MODELO COMPUTACIONAL SIMPLIFICADO COMO HERRAMIENTA PARA AUDITORÍAS ENERGÉTICAS EN SISTEMAS HVAC/R.

This article presents the results of the study performed to obtain a computational simplified model of humidification systems that can be used in field as diagnostic tool in energetic audits of systems in the branch of refrigeration and air conditioning systems (HVAC/R). The simplicity of the model and its accuracy level are crucial for the analysis, to obtain this, a series of tests and experimental analysis on different types of test equipment are made that allows the model validation.

Determinación experimental y resultados del nivel de infiltraciones de aire en sistemas HVAC/R

This article presents the results of the experimental study performed to obtain the leakage or infiltrations of air into a conditioned enclosure. This information is very important considering that could be useful to calculate the thermal load of the building and/or refrigeration systems in order to estimate the influence of this parameter on the conditioned space thermal balance. The study is performed on a test-bench specially designed to simulates the thermal behavior of an office, with a single wall exposed to outside climatic conditions where a window is located, the variables involved in the thermal balance of the window are monitored each minute, during one year.

MÉTODO PARA LA ESTIMACIÓN EXPERIMENTAL DE LA CONDUCTIVIDAD TÉRMICA DE ALGUNOS MATERIALES COMUNES EN COLOMBIA PARA APLICACIONES HVAC/R

This article presents the experimental development implemented to estimate the thermal conductivity of some materials used in Colombia at the field of refrigeration and air conditioning (HVAC/R). The thermal balance is used as a tool on a calorimeter, specially designed and instrumented to estimate the conductivity of different materials, diminishing the ambient effect on the thermal balance. The mathematical model implemented from the thermal balance is solved using EES software.

Estudio experimental de un techo climatizante funcionando en régimen de enfriamiento para sistemas HVAC

Este articulo presenta los resultados del estudio termico realizado para obtener las caracteristicas principales de funcionamiento de un sistema de techo climatizante en modo de enfriamiento: Capacidad de enfriamiento, perdida de carga, confort termico y analisis termografico. El estudio se realiza siguiendo estrictamente las recomendaciones del fabricante relacionadas con la instalacion de este tipo de equipo de climatizacion.

Analisis experimental en la medición de temperatura del aire para aplicaciones hvac/r.

This paper present the results of the experimental design performed to inner and outer air temperature measurement useful to HVAC/R applications (Heating, Ventilation, air conditioning and refrigeration). In this type of applications the temperature represents one of the main design and operation parameters of components and systems, with which to evaluate its global operation. Therefore requires measurement systems that guarantee some certainty degree at the results, to improve its efficiency and operation condition.

DISEÑO EXPERIMENTAL, CONSTRUCCIÓN Y CALIBRACIÓN DE UN SENSOR DE FLUJO DE CALOR PARA APLICACIONES HVAC/R.

This article presents the results of the study for the experimental design, construction and calibration of a heat flow sensor, useful to detection of very small heat flows in Heating, Ventilation, Air conditioning and Refrigeration (HVAC/R). A sensor design is proposed in order to measure heat flows from 2 until 30 W/(m2K) in buildings walls and climatic chambers with a maximal total uncertainty of 5 % of the measured heat flow. At the moment, for another type of applications, sensors are produced to measure highest heat flows, in which an uncertainty of +/- 5 W/(m2K) are not significant, nevertheless in HVAC/R applications this level of uncertainty is unacceptable.

Análisis Experimental En La Medición De Las Temperaturas Superficiales De Un Recinto Para Aplicaciones HVAC/R.

This paper present the results of the experimental design performed to enclosure surfaces temperature measurement useful to HVAC/R applications (Heating, Ventilation, air conditioning and refrigeration). In this type of applications the temperature represents one of the main parameters of experimental validation thermal model of a enclosure with a wall and window exposed to external ambient, with which to evaluate its global operation. Therefore requires measurement systems that guarantee some certainty degree at the results, to improve its efficiency and operation condition.

Diseño experimental y construcción de un sensor para medición de flujo masico de aire en aplicaciones HVAC

Este articulo presenta los resultados del estudio para el diseno experimental y construccion de un sensor para medicion de flujo masico de aire en aplicaciones HVAC. Este instrumento es una herramienta de diagnostico que permite estimar un importante componente del balance termico de edificios, con el cual evaluar el funcionamiento global de sistemas de acondicionamiento de aire durante su fase de operacion y/o diseno.