The combined effect of heat and moisture transfer dependent thermal conductivity of polystyrene insulation material: Impact on building energy performance

Khoukhi, Maatouk

doi:10.1016/j.enbuild.2018.03.055

Cited by 114 publications

(46 citation statements)

References 17 publications

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“…Also for that type of application, various physical processes are taken into consideration [11]. One of such important problems is the impact of the moisture content of polystyrene used in thermal insulation systems on thermal conductivity [12,13]. Another important issue related to the thermal insulation of buildings is the distribution of temperature on the outer wall surface [14][15][16], which often depends upon various perturbations [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Krause¹,

Nowoświat²

2019

Energies

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This article presents the research studies aimed at identifying the behavior of expanded polystyrene with the addition of graphite in the conditions of exposure to solar radiation. For this purpose, a series of in situ tests and laboratory studies were carried out. Three types of material were tested, i.e. expanded polystyrene (EPS) (white polystyrene), polystyrene with the addition of graphite (gray polystyrene) and two-layer polystyrene (gray bottom layer and white top layer). Temperature distributions on the surfaces of the panels in field and laboratory conditions were determined. The distributions of temperature were recorded at varied wind impact (field conditions and laboratory conditions) and at varied impact of solar radiation (laboratory conditions). Based on the conducted experiments, differences in temperature distribution on the surfaces of the tested panels were determined. In addition, geometric changes and deformation levels of the tested white and gray expanded polystyrene panels exposed to artificial sun radiation were determined in laboratory conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Krause¹,

Nowoświat²

2019

Energies

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“…In engineering, the relationship between the mass moisture content and thermal conductivity of porous building materials is usually expressed as a linear function, as follows [42][43][44]:…”

Section: Relationship Between the Ermal Conductivity And Massmentioning

confidence: 99%

Thermal Conductivity Characteristics of Thermal Insulation Materials Immersed in Water for Cold‐Region Tunnels

Sun

Zhuang

et al. 2020

Advances in Materials Science and Engineering

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This study investigates the distribution of pore water on the basis of the measured mass moisture content after soaking the tunnel insulation material. This study also analyzes the influence of the distribution of pore water on the thermal conductivity of the material on the basis of this mass moisture content. Scanning images of phenolic and polyurethane insulation boards are obtained by computer tomography (CT). The gray volume moisture content (Gv) is deduced based on the CT scanning images, to determine the distribution of pore water (Gv is the ratio of the volume of the water sample (represented by the gray value) to the volume of the saturated water sample (represented by the gray value) which is the gray volume moisture content of the sample). The correlation between gray volume moisture content and mass moisture content is determined by comparing different algorithms of gray volume moisture content and volume moisture content. The relationship between mass moisture content and thermal conductivity can be determined using a self-made quasi-steady-state tester, whereas the relationship between gray volume moisture content and thermal conductivity can be derived indirectly. Related experimental research can predict the thermal conductivity of thermal insulation materials by using a new perspective and shows the influence of pore water distribution on the thermal conductivity of materials.

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“…In harsh climatic with less industrial activ ities, the AC system represent the main source of energy consumption and may reach 70% o f the total energy consumption [2]. Regulations have been then set in many countries worldwide to assess the energy consumed in buildings.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the authors of pertinent studies have found that the k-value of most insulating materials rises as the influencing temperature increases [2,5]. Aldrich and Bond investigated the effects of temperature on the thermal performance o f rig id cellu lar foam [6].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Variable Thermal Conductivity of Insulation Materials on the Building Energy Performance in Hot Climate

2019

Self Cite

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This paper illustrates the impact of embedding an insulation layer of variable thermal conductivity in a typical building wall on the cooling effect and energy performance. The evaluation was performed by applying a conjugate heat transfer model, which was tested in extremely hot conditions of Al Ain (UAE). The thermal performance of a building incorporating insulation layers of variable thermal conductivity (k-value) was compared to a non-variable thermal conductivity system by quantifying the additional heat transferred due to the k-relationship with time. The results show that, when the k-value is a function of operating temperature, its effects on the temperature profile through the wall assembly during daytime is significant compared with that obtained when a constant k-value for the polystyrene (EPS) insulation is adopted. A similar trend in the evolution of temperatures during the day and across the wall section was observed when EPS material with different moisture content was evaluated. For the polyurethane insulation, the inner surface temperature reached 44 °C when constant k-value was adopted, increasing to 48.5 °C when the k-value was allowed to vary under the same ambient conditions.

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The combined effect of heat and moisture transfer dependent thermal conductivity of polystyrene insulation material: Impact on building energy performance

Cited by 114 publications

References 17 publications

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Thermal Conductivity Characteristics of Thermal Insulation Materials Immersed in Water for Cold‐Region Tunnels

The Impact of Variable Thermal Conductivity of Insulation Materials on the Building Energy Performance in Hot Climate

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