SHADING ON OPAQUE FACADES: PARAMETRIC STUDY ON THE EFFECTS OF FACADES ABSORBTANCE AND CLIMATES

Abstract

This paper delves into the effects of horizontal shading overhangs on building energy performance, conductive heat gain, and incident solar radiation across various climatic conditions. With a focus on horizontal shading overhangs, the parametric study conducted evaluates the interplay between incident solar radiation, conductive heat gain, and HVAC energy consumption. A comprehensive analysis is conducted across six distinct U.S. climates (Atlanta, Houston, Los Angeles, Miami, Phoenix, and Seattle) and the tropical climate of Singapore.

A key discovery of this research is the substantial energy savings achieved through the implementation of shading strategies on opaque facades. The energy savings potential varies according to climate, with significant findings showcasing energy savings ranging from 10% to 30% in HVAC energy consumption. In regions with high solar exposure, like Phoenix, the impact of shading solutions on energy savings is particularly pronounced, with potential reductions in energy consumption reaching up to 30%.

Furthermore, this study underscores the critical influence of solar absorptance values (ranging from 0.2 to 0.92) on these energy savings. It was found that buildings with higher solar absorptance values benefited most from shading solutions. In climates with higher solar absorptance values, such as Phoenix, shading interventions resulted in HVAC energy savings on the higher end of the spectrum. In contrast, climates with lower solar absorptance values, like Seattle, demonstrated more modest energy savings.

In summary, this research advances the knowledge of building energy performance and shading strategies by emphasizing the crucial connection between climate and efficient facade design. Its implications will guide the development of climate-responsive building solutions and inspire further exploration into sustainable and environmentally responsible architectural practices.