Modelo matemático para el balance de calor de un techo verde encondiciones de trópico húmedo

Source abstract

Green roofs represent an effective passive strategy to reduce heat transfer through building envelopes, particularly in warm and humid climates. This study presents a one-dimensional dynamic heat and mass balance model to evaluate the thermal behavior of an extensive green roof under humid tropical conditions. The model accounts for conductive, convective, radiative, and moisture-related processes, explicitly incorporating evapotranspiration and vegetation dependent parameters. Model calibration and simulations were performed using experimental data obtained from a green roof experimental platform located in Tabasco, Mexico, planted with Tradescantia spathacea and Tradescantia pallida. System performance was evaluated under three representative climatic scenarios: dry, rainy, and cold-front conditions. Results show that the vegetation layer reduces heat transfer into the building while contributing to thermal stabilization of the microclimate. Sensitivity analysis indicates that vegetation-related parameters, particularly leaf area index and internal leaf resistance, exert a dominant influence on system response. Although limited to a one-dimensional representation and specific species, the model provides a useful framework for assessing green roof performance in humid tropical climates.