On the Effects of Variation of Thermal Conductivity in Buildings in the Italian Construction Sector

Umberto Berardi, Lamberto Tronchin, Massimiliano Manfren, Benedetto Nastasi

Research output: Contribution to journalArticleScientificpeer-review

47 Citations (Scopus)
13 Downloads (Pure)

Abstract

Stationary and dynamic heat and mass transfer analyses of building components are an essential part of energy efficient design of new and retrofitted buildings. Generally, a single constant thermal conductivity value is assumed for each material layer in construction components. However, the variability of thermal conductivity may depend on many factors; temperature and moisture content are among the most relevant ones. A linear temperature dependence of thermal conductivity has been found experimentally for materials made of inorganic fibers such as rockwool or fiberglass, showing lower thermal conductivities at lower temperatures. On the contrary, a nonlinear temperature dependence has been found for foamed insulation materials like polyisocyanurate, with a significant deviation from linear behavior. For this reason, thermal conductivity assumptions used in thermal calculations of construction components and in whole-building performance simulations have to be critically questioned. This study aims to evaluate how temperature affects thermal conductivity of materials in building components such as exterior walls and flat roofs in different climate conditions. Therefore, experimental conductivities measured for four common insulation materials have been used as a basis to simulate the behavior of typical construction components in three different Italian climate conditions, corresponding to the cities of Turin, Rome, and Palermo.
Original languageEnglish
Article number872
Number of pages17
JournalEnergies
Volume11
Issue number4
DOIs
Publication statusPublished - 2018

Keywords

  • insulation materials
  • thermal conductivity
  • building energy consumption
  • temperature dependence
  • high-performance buildings

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