Waldo Bustamante

Evaluation of radiance's genBSDF capability to assess solar bidirectional properties of complex fenestration systems

Complex fenestration systems (CFS) need to be evaluated to quantify how well they contribute to avoid glare and manage the solar heat gains through building façades. It is possible to use solar bidirectional properties of CFS in some building energy simulations tools in order to evaluate more accurately their impact on lighting, cooling and heating energy consumption. genBSDF is a Radiances program whose capabilities of assessing the bidirectional solar properties of CFS are evaluated in this paper. This evaluation was carried out for 16 cases of a venetian blind varying the solar properties and slope angle of the slats. Results of directional and bidirectional solar properties obtained by genBSDF with radiosity assumptions were compared with the results of the radiosity-based WINDOW algorithm. Results show an excellent agreement between the two approaches which demonstrates that genBSDF is a very precise and robust tool for assessing the solar bidirectional properties of CFS.

PARÁMETROS DE DISEÑO Y DESEMPEÑO ENERGÉTICO EN EDIFICIOS DE CLIMA MEDITERRÁNEO

La eleccion de cuatro parametros de diseno como determinantes basicos del desempeno energetico de un edificio permitio configurar un esquema de analisis de sensibilidad global para evaluar como los cambios en el diseno pueden afectar las condiciones ambientales de una estructura.

Modelación CFD de casos básicos de convección en ambientes cerrados: necesidades de principiantes en CFD para adquirir habilidades y confianza en la modelación CFD

Prediction of airflow pattern and velocities, temperature, moisture and pollutants concentration is required to design healthy and comfortable indoor environments. Computational Fluid Dynamics (CFD) is the most advanced technique to model and predict the airflow in enclosed environments. However, the main errors in CFD models and their results are linked to the human factor. Beginners on CFD modeling do not account with skills, experience and engineering judgment to generate robust and reliable CFD models. This process is not intuitive and new CFD users need guidance. This paper aims to provide more complete information on CFD modeling of basic natural, forced and mixed convection cases that would allow CFD beginners to acquire skills and confidence. CFD modeling includes mesh generation, setting convergence criteria and under-relaxation factors, and evaluating different turbulence models for each convection case. Results show that users´ expertise is needed in each step of CFD modeling, even for these basic convection cases. Rev. ing. constr. [online]. 2014, vol.29, n.1, pp. 22-45. ISSN 0718-5073 http://dx.doi.org/10.4067/S0718-50732014000100002

ANÁLISIS DE ESTRATEGIAS PARA CONFORT TÉRMICO Y LUMÍNICO DE EDIFICIOS EN DIFERENTES CLIMAS DE LA ZONA CENTRAL DE CHILE

A traves de simulaciones digitales se efectuaron mediciones ambientales en tres edificios de oficinas en la zona central de Chile, considerando tanto su situacion presente como una hipotetica aplicacion de mejoras. El ejercicio verifico la condicion critica de los meses de verano para efectos del confort ambiental.

Iluminación natural de edificios de oficina

In the search for control of natural lighting and weather inclemency, systems of measurement have been generated based on geographical location, times, and weather conditions. The use of dynamic measurements that consider factors in constant change is applied to evaluate representative typologies of office buildings built in Santiago.