Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Improvements in Software DOMUS about Atmospheric Radiative Exchange and Long-wave Boundary Conditions
Submission Author:
Santiago Riquelme , PR , Chile
Co-Authors:
Santiago Riquelme, Nathan Mendes, Luís Mauro Moura
Presenter: Santiago Riquelme
doi://10.26678/ABCM.ENCIT2018.CIT18-0231
Abstract
External long-wave radiative heat transfer is a typical boundary condition problem in building physics and the solution of the Radiative Transfer Equation (RTE) involve important mathematical skills to apply a simple model and still nowadays the computational cost in algorithms for solution the integral-differential RTE is not explicit implemented in building simulation software. The aim of this work is the review, analysis and subsequent implementation of empirical models for evaluation of atmospheric radiation presented in literature. The empirical approach based in synoptic data to estimate atmospheric long-wave radiation is associated to a fictive sky model with an effective sky emissivity and its respective sky temperature. Some models simplify the phenomenon by assuming the sky temperature as equal to the outdoor air temperature, others present a relationship with different meteorological synoptic data. Finally, more complex models involve to know very clearly the amount of long-wave radiation exchanged with the building external surface. The results obtained from the different synoptic models will be compared between them, with the current algorithm available in DOMUS software and with measured long-wave available radiation data
Keywords
Atmospheric Radiation, Long-wave Radiation, Sky Temperature
