The reduction of energy consumption and the thermal updating of existing buildings are strategies for decreasing atmospheric emissions and achieving the objectives set by the European Community to be met by 2020. The application of the European and national energy standards to the renovation of existing buildings, has produced improvements and added value to existing buildings by reducing their energy use. In this study the focus is on the thermal insulation applied to the inside or outside of the existing walls. In this context, a relatively unusual solution is analyzed: insulation with straw bales. In addition to the state of the art analysis of the characteristics of straw when used in construction, 16 cases of existing buildings insulated with straw bales are analyzed (14 outer insulation and 2 inner insulation). To understand the limits of this solutions and the elements used during the installation of the insulation it was used a technological analysis. The research presented in this study shows that the choice of this type of insulation is based upon the values of the inhabitants and their willingness to take part during the construction phases. This insulation is limited to buildings located in rural or semi-urban areas because the large thickness of the insulating layer (minimum 35 cm) limits the entry of the light into the rooms. From these considerations of the thickness of insulation applied to an existing wall, the hygrometric behavior of the insulation has been studied (calculation of the amount of water present in the insulating layer and in the total insulated wall and the calculation of Moisture Buffer Value), compared with hemp lime, on two types of enclosures (solid wall and cavity wall) through simulations with WUFI software. At the end of the simulation it was found that, although in some instances the total thickness of the insulated wall exceeded 90 cm, interstitial condensation didn’t occur because the insulating materials used were breathable. To understand the influence of straw as a thermal insulation, it was built as an outside insulation on a vertical wall of a private home. In this experiment thermographic measurement and monitoring were undertaken to analyze the transmittance (U-value), the variations of temperature and the heat flows through the walls of two adjacent rooms of the same size. Analysis of the results showed that the straw insulation increased the surface temperature of the insulated wall by approximately 1.60 C compared with the non-insulated wall and the heat fluxes were reduced by 50% in the insulated wall.

stra(w)isolami. Analisi tecnologica di edifici esistenti isolati con balle di paglia / Bertorello, ANNA RITA. - (2014). [10.6092/polito/porto/2538731]

stra(w)isolami. Analisi tecnologica di edifici esistenti isolati con balle di paglia

BERTORELLO, ANNA RITA
2014

Abstract

The reduction of energy consumption and the thermal updating of existing buildings are strategies for decreasing atmospheric emissions and achieving the objectives set by the European Community to be met by 2020. The application of the European and national energy standards to the renovation of existing buildings, has produced improvements and added value to existing buildings by reducing their energy use. In this study the focus is on the thermal insulation applied to the inside or outside of the existing walls. In this context, a relatively unusual solution is analyzed: insulation with straw bales. In addition to the state of the art analysis of the characteristics of straw when used in construction, 16 cases of existing buildings insulated with straw bales are analyzed (14 outer insulation and 2 inner insulation). To understand the limits of this solutions and the elements used during the installation of the insulation it was used a technological analysis. The research presented in this study shows that the choice of this type of insulation is based upon the values of the inhabitants and their willingness to take part during the construction phases. This insulation is limited to buildings located in rural or semi-urban areas because the large thickness of the insulating layer (minimum 35 cm) limits the entry of the light into the rooms. From these considerations of the thickness of insulation applied to an existing wall, the hygrometric behavior of the insulation has been studied (calculation of the amount of water present in the insulating layer and in the total insulated wall and the calculation of Moisture Buffer Value), compared with hemp lime, on two types of enclosures (solid wall and cavity wall) through simulations with WUFI software. At the end of the simulation it was found that, although in some instances the total thickness of the insulated wall exceeded 90 cm, interstitial condensation didn’t occur because the insulating materials used were breathable. To understand the influence of straw as a thermal insulation, it was built as an outside insulation on a vertical wall of a private home. In this experiment thermographic measurement and monitoring were undertaken to analyze the transmittance (U-value), the variations of temperature and the heat flows through the walls of two adjacent rooms of the same size. Analysis of the results showed that the straw insulation increased the surface temperature of the insulated wall by approximately 1.60 C compared with the non-insulated wall and the heat fluxes were reduced by 50% in the insulated wall.
2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2538731
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