The environmental impact of buildings involves their realization, the supply and the transportation of raw materials, their disposal and, finally, the management of air-conditioning plants in order to guarantee the achievement of thermal comfort condi-tions. A sustainability option for the building sector is represented by passive houses. With reference to traditional sizing procedure, in Mediterranean climatic conditions dif-ferent approaches in the design phase have to be adopted in order to avoid the risk linked to the overheating of indoor environments. In particular, solutions for the rational exploitation of energy gains appear more significant than the reduction of thermal loss-es. Therefore, aspects concerning the attenuation and the time lag of thermal waves de-livered through opaque walls, the control of the transmitted solar radiation through transparent surfaces, as well as free-cooling, have major significance compared to high thermal insulation thickness and large glazed surfaces towards South. In this paper, in-novative technical solutions for the realization of opaque walls in the building envelope, are proposed. In particular, the behaviour of dry assembled opaque walls equipped with ordinary and natural layers, have been studied. Especially, the role of loose sand located inside the walls to increase their thermal capacity, has been investigated. The proposed layering systems combine different aspects concerning technological innovation, energy saving and rational exploitation of materials. The dynamic behaviour of the proposed solutions for horizontal and vertical dry assembled walls, was evaluated. Different solu-tions to contrast the thermal bridge effects in the structural nodes have been proposed. Finally, for the building envelope made by the identified best solutions, evaluations car-ried out in a dynamic calculation environment have determined the optimal configura-tion of a reference building that allows for the achievement of thermal energy require-ments lower than 15 kWh/m², both in winter and in summer.
Study of innovative solutions of the building envelope for passive houses in Mediterranean areas
ARCURI, Natale;Bruno R;
2017-01-01
Abstract
The environmental impact of buildings involves their realization, the supply and the transportation of raw materials, their disposal and, finally, the management of air-conditioning plants in order to guarantee the achievement of thermal comfort condi-tions. A sustainability option for the building sector is represented by passive houses. With reference to traditional sizing procedure, in Mediterranean climatic conditions dif-ferent approaches in the design phase have to be adopted in order to avoid the risk linked to the overheating of indoor environments. In particular, solutions for the rational exploitation of energy gains appear more significant than the reduction of thermal loss-es. Therefore, aspects concerning the attenuation and the time lag of thermal waves de-livered through opaque walls, the control of the transmitted solar radiation through transparent surfaces, as well as free-cooling, have major significance compared to high thermal insulation thickness and large glazed surfaces towards South. In this paper, in-novative technical solutions for the realization of opaque walls in the building envelope, are proposed. In particular, the behaviour of dry assembled opaque walls equipped with ordinary and natural layers, have been studied. Especially, the role of loose sand located inside the walls to increase their thermal capacity, has been investigated. The proposed layering systems combine different aspects concerning technological innovation, energy saving and rational exploitation of materials. The dynamic behaviour of the proposed solutions for horizontal and vertical dry assembled walls, was evaluated. Different solu-tions to contrast the thermal bridge effects in the structural nodes have been proposed. Finally, for the building envelope made by the identified best solutions, evaluations car-ried out in a dynamic calculation environment have determined the optimal configura-tion of a reference building that allows for the achievement of thermal energy require-ments lower than 15 kWh/m², both in winter and in summer.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
