Analysis of optimum insulation thickness for external walls at different orientations based on real-time measurements

Abstract

In this study, the optimum insulation thickness was calculated for the heating season for external walls in the different directions of a building. For this reason, a building used for housing in Istanbul, Turkey was taken as model. The indoor and outdoor temperatures, along with the interior and exterior surface temperatures of the building's external walls, were continuously measured using thermocouples and recorded in four different directions throughout the year. The effects of solar radiation, which vary based on the direction, were assessed for the heat transfer through the external walls. The results of this study indicate that the optimum insulation thickness for the north, south, west, and east facing walls should be 6.47, 2.87, 6.97, and 6.98 cm, respectively, based on the differences in the amount of solar radiation exposure of the walls in the different directions. The optimum insulation thickness of the building's external wall was calculated as 5.25 cm, regardless of its direction. An economic analysis of the thermal insulation cost was conducted using the P 1-P 2 method, and then the payback periods were calculated. The heating energy consumption of the building designed using the optimum insulation thicknesses, as identified separately based on the direction, decreased by 17%, compared to the present building with 3 cm of thermal insulation.

A Comparative Analysis of Traditional and New Construction Methods for External Wall Insulation in Jiangning, Nanjing, China

“…In contrast, more recent methods, such as using thermal insulation blocks, have demonstrated significant reductions in heat transfer and energy consumption in residential buildings [5]Comparative analyses have also been conducted to decrease the thermal transmittance in traditional wall structures by employing techniques like radiant shields, low-e coatings, and insulating fillings [25].Moreover, research has emphasized the advantages of incorporating innovative materials, such as MgO-based boards, in construction to promote sustainability and energy efficiency [26]This includes benefits such as improved energy storage, enhanced comfort, and increased resistance to fire. Moreover, studies have examined the influence of insulation materials on building energy efficiency by comparing traditional options with cuttingmaterials, such as aerogel and vacuum insulation panels [3].In addition, research on the thermal performance of various wall constructions, featuring straw bales, bio-based materials, and rammed earth, has demonstrated their ability to provide effective thermal insulation and enhance hygrothermal comfort [14]; [4]; [27].Furthermore, studies have delved into optimizing insulation thickness through real-time measurements and examined the influence of factors, such as surface reflectivity, on insulation strategies for buildings in diverse climates [12]; [28].In summary, the field of external wall insulation methods encompasses a diverse range of studies that examine both traditional and contemporary construction techniques, assess the thermal performance of various materials, and aim to improve energy efficiency in buildings. The results of these investigations clearly demonstrate that progress in insulation technology presents encouraging prospects for enhancing the sustainability and energy efficiency of buildings.…”

“…This comparative analysis provides valuable insights into the benefits of new construction methods for external wall insulation in Jiangning, Nanjing, China. [10][11][12] .Furthermore, the combination of insulation thickness and surface solar reflectivity has been examined to develop effective insulation strategies for specific regions [13]. The influence of different insulation solutions on building performance has been a subject of interest, with studies focusing on factors such as thermal resistance, acoustic insulation, and overall energy efficiency.…”

Full-Fledged Use of Semi-Basement Space by Building Seismic-Resistance, Energy-Efficiency, Microclimate and Preventing Influences of Thermal Bridges and Mold Growth

“…The article [34] examines the heat losses of basement rooms depending on the soil properties and the features of the thermal insulation of enclosures. In work [35], the thickness of the thermal insulation of the external walls was calculated taking into account the duration of the heating period.…”