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On the effects of variation of thermal conductivity in buildings in the Italian construction sector

On the effects of variation of thermal conductivity in buildings in the Italian construction sector
On the effects of variation of thermal conductivity in buildings in the Italian construction sector

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.

Building energy consumption, High-performance buildings, Insulation materials, Temperature dependence, Thermal conductivity
1996-1073
1-17
Berardi, Umberto
0096207b-9a54-4b00-b550-3b26f4f3839d
Tronchin, Lamberto
550312d9-21be-41d8-8947-a0d6fb5c52a8
Manfren, Massimiliano
f2b8c02d-cb78-411d-aed1-c4d056365392
Nastasi, Benedetto
0d19eabe-134e-4cbe-9912-ff4c095410cd
Berardi, Umberto
0096207b-9a54-4b00-b550-3b26f4f3839d
Tronchin, Lamberto
550312d9-21be-41d8-8947-a0d6fb5c52a8
Manfren, Massimiliano
f2b8c02d-cb78-411d-aed1-c4d056365392
Nastasi, Benedetto
0d19eabe-134e-4cbe-9912-ff4c095410cd

Berardi, Umberto, Tronchin, Lamberto, Manfren, Massimiliano and Nastasi, Benedetto (2018) On the effects of variation of thermal conductivity in buildings in the Italian construction sector. Energies, 11 (4), 1-17. (doi:10.3390/en11040872).

Record type: Article

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.

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energies-11-00872 - Version of Record
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More information

Accepted/In Press date: 5 April 2018
e-pub ahead of print date: 9 April 2018
Published date: April 2018
Keywords: Building energy consumption, High-performance buildings, Insulation materials, Temperature dependence, Thermal conductivity

Identifiers

Local EPrints ID: 419972
URI: https://eprints.soton.ac.uk/id/eprint/419972
ISSN: 1996-1073
PURE UUID: 5f77342a-b651-485a-a1a6-e850823faaa3

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Date deposited: 25 Apr 2018 16:30
Last modified: 13 Mar 2019 18:34

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