The Experts below are selected from a list of 3348 Experts worldwide ranked by ideXlab platform
Marco Perino - One of the best experts on this subject based on the ideXlab platform.
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Thermal bridges in vacuum insulation panels at building scale
Proceedings of the Institution of Civil Engineers - Engineering Sustainability, 2017Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:In this paper a numerical analysis aimed at evaluating the thermal performance of vacuum insulation panels (VIPs) at the building scale is presented. This technology has seen considerable development over the past few years, gaining increasing penetration in the building insulation market. However, it is important to evaluate correctly the thermal Bridging Effect that occurs when the VIPs are coupled with joints at the building scale. To this purpose, the linear thermal transmittances of different VIP assemblies inserted in several wall configurations were assessed through a bidimensional numerical analysis. Moreover, to evaluate the influence of thermal bridges on the building energy need, quasi-steady-state simulations for a parametric building module were performed. A simple empirical model was finally built to estimate the linear thermal transmittance from basic input variables. The study demonstrates that thermal Bridging Effects that occur when VIPs are jointed are never negligible and they could ha...
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Vacuum Insulation Panels: Thermal Bridging Effects and Energy Performance in Real Building Applications☆
Energy Procedia, 2015Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract Due to their very low thermal conductivity, Vacuum Insulation Panels (VIPs) have recently seen a fast development and an increasing penetration in building thermal insulation market. However, there is still a lack of knowledge about their performance when actually applied in buildings. In fact, the thermal Bridging Effects that occur in VIP junctions are not easily evaluable while produce a reduction of the global thermal performance. In this paper, the linear thermal transmittances related to VIP junctions considering different joint materials between VIPs panels and different wall configurations were assessed through a 2D numerical analysis. Finally, through a quasi-steady state simulation, a parametric building case study was analysed, with the aim to evaluate the influence of the thermal Bridging Effects on the overall building energy need. The results shows that the thermal Bridging Effect due to VIPs assemblies have not a negligible influence on the overall building energy performance.
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The Effect of Different Materials Joint in Vacuum Insulation Panels
Energy Procedia, 2014Co-Authors: Alice Lorenzati, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract During recent years the use of Vacuum Insulation Panels in buildings applications has been improved, because of their both higher performances and lower thickness compared to traditional insulation materials. These performances are due to the interior vacuum degree, which represent also the main problem connected with the applications of this technological solution in buildings constructions: to maintain the vacuum condition the panels are enclosed in an envelope layer, characterized by an higher thermal conductivity. Moreover they have to be assembled to each other or to additional different joint materials in practical building application, generating a thermal Bridging Effect. The aim of present work is to analyse the critical aspects related to this insulation technology for building application. An experimental campaign through heat flow meter apparatus was carried out with the purpose of assessing the decrease of performance due to the thermal bridges Effects considering different joint materials in VIPs assemblies.
J C Van Dijk - One of the best experts on this subject based on the ideXlab platform.
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fouling control mechanisms of demineralized water backwash reduction of charge screening and calcium Bridging Effects
Water Research, 2011Co-Authors: S G J Heijma, J Q J C Verberk, Gary L Amy, Pierre Le Clech, A J Kemperma, J C Van DijkAbstract:This paper investigates the impact of the ionic environment on the charge of colloidal natural organic matter (NOM) and ultrafiltration (UF) membranes (charge screening Effect) and the calcium adsorption/Bridging on new and fouled membranes (calcium Bridging Effect) by measuring the zeta potentials of membranes and colloidal NOM. Fouling experiments were conducted with natural water to determine whether the reduction of the charge screening Effect and/or calcium Bridging Effect by backwashing with demineralized water can explain the observed reduction in fouling. Results show that the charge of both membranes and NOM, as measured by the zeta potential, became more negative at a lower pH and a lower concentration of electrolytes, in particular, divalent electrolytes. In addition, calcium also adsorbed onto the membranes, and consequently bridged colloidal NOM and membranes via binding with functional groups. The charge screening Effect could be eliminated by flushing NOM and membranes with demineralized water, since a cation-free environment was established. However, only a limited amount of the calcium Bridging connection was removed with demineralized water backwashes, so the calcium Bridging Effect mostly could not be eliminated. As demineralized water backwash was found to be Effective in fouling control, it can be concluded that the reduction of the charge screening is the dominant mechanism for this.
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a pilot scale study of backwashing ultrafiltration membrane with demineralized water
Journal of Water Supply Research and Technology-aqua, 2010Co-Authors: S G J Heijma, J C Van DijkAbstract:This study investigates the Effectiveness of different backwash waters on ultrafiltration (UF) fouling control on a pilot-scale setup. Surface water and ion exchange (IEX) pretreated surface water were used as feed water. Three backwash waters were tested: demineralized water, UF permeate and nanofiltration (NF) permeate. Results show that backwashing with demineralized water substantially improves fouling control efficiency. It is supposed that both the reduction of charge screening and Ca-Bridging Effect cause this improvement on fouling control. Furthermore, backwashing with NF permeate also negatively influences the fouling control efficiency, indicating the impact of monovalent ions in backwash water on the ultrafiltration fouling. Findings from such a pilot scale setup also show that it is possible to apply backwashing with demineralized water on the operation of UF plants.
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Influence of Ca and Na ions in backwash water on ultrafiltration fouling control
Desalination, 2010Co-Authors: S.g.j. Heijman, J Q J C Verberk, J C Van DijkAbstract:The Effect of calcium and sodium in backwash water on the fouling control of ultrafiltration is investigated on a bench scale. Besides permeate of ultrafiltration and demineralized water, solutions with different calcium or sodium concentrations were used for backwash. The results show that backwashing with demineralized water is better than with permeate of ultrafiltration. The backwash efficiency decreases when calcium and sodium are added in demineralized water for backwash. That is probably because the presence of calcium and sodium in backwash water increases the Ca-Bridging Effect between the negatively charged membrane and the negatively charged NOM, and compresses the double layer of the membrane and the NOM, leading to a strong adhesion force on the membrane.
Alfonso Capozzoli - One of the best experts on this subject based on the ideXlab platform.
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Thermal bridges in vacuum insulation panels at building scale
Proceedings of the Institution of Civil Engineers - Engineering Sustainability, 2017Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:In this paper a numerical analysis aimed at evaluating the thermal performance of vacuum insulation panels (VIPs) at the building scale is presented. This technology has seen considerable development over the past few years, gaining increasing penetration in the building insulation market. However, it is important to evaluate correctly the thermal Bridging Effect that occurs when the VIPs are coupled with joints at the building scale. To this purpose, the linear thermal transmittances of different VIP assemblies inserted in several wall configurations were assessed through a bidimensional numerical analysis. Moreover, to evaluate the influence of thermal bridges on the building energy need, quasi-steady-state simulations for a parametric building module were performed. A simple empirical model was finally built to estimate the linear thermal transmittance from basic input variables. The study demonstrates that thermal Bridging Effects that occur when VIPs are jointed are never negligible and they could ha...
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Vacuum Insulation Panels: Thermal Bridging Effects and Energy Performance in Real Building Applications☆
Energy Procedia, 2015Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract Due to their very low thermal conductivity, Vacuum Insulation Panels (VIPs) have recently seen a fast development and an increasing penetration in building thermal insulation market. However, there is still a lack of knowledge about their performance when actually applied in buildings. In fact, the thermal Bridging Effects that occur in VIP junctions are not easily evaluable while produce a reduction of the global thermal performance. In this paper, the linear thermal transmittances related to VIP junctions considering different joint materials between VIPs panels and different wall configurations were assessed through a 2D numerical analysis. Finally, through a quasi-steady state simulation, a parametric building case study was analysed, with the aim to evaluate the influence of the thermal Bridging Effects on the overall building energy need. The results shows that the thermal Bridging Effect due to VIPs assemblies have not a negligible influence on the overall building energy performance.
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The Effect of Different Materials Joint in Vacuum Insulation Panels
Energy Procedia, 2014Co-Authors: Alice Lorenzati, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract During recent years the use of Vacuum Insulation Panels in buildings applications has been improved, because of their both higher performances and lower thickness compared to traditional insulation materials. These performances are due to the interior vacuum degree, which represent also the main problem connected with the applications of this technological solution in buildings constructions: to maintain the vacuum condition the panels are enclosed in an envelope layer, characterized by an higher thermal conductivity. Moreover they have to be assembled to each other or to additional different joint materials in practical building application, generating a thermal Bridging Effect. The aim of present work is to analyse the critical aspects related to this insulation technology for building application. An experimental campaign through heat flow meter apparatus was carried out with the purpose of assessing the decrease of performance due to the thermal bridges Effects considering different joint materials in VIPs assemblies.
Stefano Fantucci - One of the best experts on this subject based on the ideXlab platform.
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Thermal bridges in vacuum insulation panels at building scale
Proceedings of the Institution of Civil Engineers - Engineering Sustainability, 2017Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:In this paper a numerical analysis aimed at evaluating the thermal performance of vacuum insulation panels (VIPs) at the building scale is presented. This technology has seen considerable development over the past few years, gaining increasing penetration in the building insulation market. However, it is important to evaluate correctly the thermal Bridging Effect that occurs when the VIPs are coupled with joints at the building scale. To this purpose, the linear thermal transmittances of different VIP assemblies inserted in several wall configurations were assessed through a bidimensional numerical analysis. Moreover, to evaluate the influence of thermal bridges on the building energy need, quasi-steady-state simulations for a parametric building module were performed. A simple empirical model was finally built to estimate the linear thermal transmittance from basic input variables. The study demonstrates that thermal Bridging Effects that occur when VIPs are jointed are never negligible and they could ha...
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Vacuum Insulation Panels: Thermal Bridging Effects and Energy Performance in Real Building Applications☆
Energy Procedia, 2015Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract Due to their very low thermal conductivity, Vacuum Insulation Panels (VIPs) have recently seen a fast development and an increasing penetration in building thermal insulation market. However, there is still a lack of knowledge about their performance when actually applied in buildings. In fact, the thermal Bridging Effects that occur in VIP junctions are not easily evaluable while produce a reduction of the global thermal performance. In this paper, the linear thermal transmittances related to VIP junctions considering different joint materials between VIPs panels and different wall configurations were assessed through a 2D numerical analysis. Finally, through a quasi-steady state simulation, a parametric building case study was analysed, with the aim to evaluate the influence of the thermal Bridging Effects on the overall building energy need. The results shows that the thermal Bridging Effect due to VIPs assemblies have not a negligible influence on the overall building energy performance.
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The Effect of Different Materials Joint in Vacuum Insulation Panels
Energy Procedia, 2014Co-Authors: Alice Lorenzati, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract During recent years the use of Vacuum Insulation Panels in buildings applications has been improved, because of their both higher performances and lower thickness compared to traditional insulation materials. These performances are due to the interior vacuum degree, which represent also the main problem connected with the applications of this technological solution in buildings constructions: to maintain the vacuum condition the panels are enclosed in an envelope layer, characterized by an higher thermal conductivity. Moreover they have to be assembled to each other or to additional different joint materials in practical building application, generating a thermal Bridging Effect. The aim of present work is to analyse the critical aspects related to this insulation technology for building application. An experimental campaign through heat flow meter apparatus was carried out with the purpose of assessing the decrease of performance due to the thermal bridges Effects considering different joint materials in VIPs assemblies.
Francesco Isaia - One of the best experts on this subject based on the ideXlab platform.
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Thermal bridges in vacuum insulation panels at building scale
Proceedings of the Institution of Civil Engineers - Engineering Sustainability, 2017Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:In this paper a numerical analysis aimed at evaluating the thermal performance of vacuum insulation panels (VIPs) at the building scale is presented. This technology has seen considerable development over the past few years, gaining increasing penetration in the building insulation market. However, it is important to evaluate correctly the thermal Bridging Effect that occurs when the VIPs are coupled with joints at the building scale. To this purpose, the linear thermal transmittances of different VIP assemblies inserted in several wall configurations were assessed through a bidimensional numerical analysis. Moreover, to evaluate the influence of thermal bridges on the building energy need, quasi-steady-state simulations for a parametric building module were performed. A simple empirical model was finally built to estimate the linear thermal transmittance from basic input variables. The study demonstrates that thermal Bridging Effects that occur when VIPs are jointed are never negligible and they could ha...
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Vacuum Insulation Panels: Thermal Bridging Effects and Energy Performance in Real Building Applications☆
Energy Procedia, 2015Co-Authors: Francesco Isaia, Stefano Fantucci, Alfonso Capozzoli, Marco PerinoAbstract:Abstract Due to their very low thermal conductivity, Vacuum Insulation Panels (VIPs) have recently seen a fast development and an increasing penetration in building thermal insulation market. However, there is still a lack of knowledge about their performance when actually applied in buildings. In fact, the thermal Bridging Effects that occur in VIP junctions are not easily evaluable while produce a reduction of the global thermal performance. In this paper, the linear thermal transmittances related to VIP junctions considering different joint materials between VIPs panels and different wall configurations were assessed through a 2D numerical analysis. Finally, through a quasi-steady state simulation, a parametric building case study was analysed, with the aim to evaluate the influence of the thermal Bridging Effects on the overall building energy need. The results shows that the thermal Bridging Effect due to VIPs assemblies have not a negligible influence on the overall building energy performance.