A Building Information Modeling driven approach for improving building envelope energy efficiency in hot arid climates

Abstract

As a response to growing energy demand and greenhouse gas emissions, enhancing the energy performance of buildings has become a global focus. Studies have shown that building openings are responsible for 40–50% of their energy loss, and these percentages are growing steadily. Silica aerogel represents a potential energy-saving technology for buildings. It has demonstrated its effectiveness as an insulating material in various climates; especially cold climates, however its success in hot arid climates has not been examined yet. Therefore, this paper aims to assess the thermal properties of silica aerogel to determine the dominant parameters that impact its thermal performance in a hot, arid climate. A numerical model of the silica aerogel is conducted using Autodesk Ecotect Analysis. The impact of different factors (thermal conductivity, density, specific heat, and thickness of silica aerogel) on the energy efficiency of the glass window was investigated. Results show that the thickness of silica aerogel has the highest impact on the thermal behavior of silica aerogel, followed by thermal conductivity. Meanwhile, density and specific heat showed a negligible effect on the energy performance of the material. Results showed that a 5 mm-thick aerogel layer and a thermal conductivity of 0.014 W/(mK) exploit the energy performance of the proposed material in hot, arid climates and could provide energy savings of around 63% and 15% in heating and cooling demands, respectively.