The Effectiveness of Thermal Insulation in Lightweight Steel-Framed Walls with Respect to Its Position

Roque, Eduardo; Santos, Paulo

doi:10.3390/buildings7010013

Cited by 54 publications

(68 citation statements)

References 20 publications

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“…Their relevance to the overall U-value of LSF wall is also low, as previously verified in refs. [9] [27]. Moreover, given the very reduced thickness of the vapour barrier (about 0.2 mm) and its consequent negligible influence in wall U-value, it was adopted not to use it in the experimental lab tests, neither in the numerical simulations.…”

Section: Walls Description and Materials Characterizationmentioning

confidence: 99%

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Thermal transmittance of lightweight steel framed walls: Experimental versus numerical and analytical approaches

Santos

Gonçalves

Martins

et al. 2019

Journal of Building Engineering

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Given the great influence of the thermal transmittance of the building envelope on the overall thermal performance and energy efficiency of the building, it is essential to accurately determine the U-value of the main building envelope elements. Due to the great heterogeneity of the thermal conductivity of the elements presented in a lightweight steelframed (LSF) wall, and to the geometric complexity of some steel framed structures, a reliable estimation of the thermal transmittance of LSF elements is even more challenging. Indeed, thermal bridging originated by steel studs must be considered in the assessment of the thermal transmittance of LSF walls. In this work, the thermal transmittance (U-value) of three LSF walls with different configurations will be investigated based on four different approaches: experimental laboratorial measurements based on the Heat Flow Meter (HFM) method; 3D finite element method (FEM) simulations using ANSYS CFX ® software; 2D FEM-based simulations using THERM software; analytical estimations based on the ISO 6946 procedure for building components with inhomogeneous layers. Several verification procedures were performed to ensure the reliability of the results. It was found that a secondary wood stud can mitigate the thermal bridging effect of the steel frame and improve the LSF thermal performance, which is more noticeable when there is no thermal insulation. Furthermore, a good agreement was found between the results of the 2D FEM and the analytical ISO 6946 approaches for the LSF wall with only vertical steel studs.

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Section: Walls Description and Materials Characterizationmentioning

confidence: 99%

“…Thermal bridging originated by steel studs is seen as a hot topic of research in the LSF construction research field. Roque and Santos [9] studied the effectiveness of thermal insulation in LSF walls regarding its position in the assemblage. They concluded that external thermal insulation is more effective than batt insulation.…”

Section: Introductionmentioning

confidence: 99%

Thermal transmittance of lightweight steel framed walls: Experimental versus numerical and analytical approaches

Santos

Gonçalves

Martins

et al. 2019

Journal of Building Engineering

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“…Notice that the batt insulation, besides the thermal insulation function, can also perform an important acoustic insulation function [4]. Moreover, the effectiveness of thermal insulation depends on its position in the LSF element [5], as well as on the type of LSF construction [6].…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations could be performed with more simpler two-dimensional (2D) models [5,6] or more complex/detailed three-dimensional (3D) models [9,10]. They have the advantage of allowing a quick comparison between several building component solutions/configurations.…”

Section: Introductionmentioning

confidence: 99%

Analytical Methods to Estimate the Thermal Transmittance of LSF Walls: Calculation Procedures Review and Accuracy Comparison

2020

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An accurate evaluation of the thermal transmittance ( U -value) of building envelope elements is fundamental for a reliable assessment of their thermal behaviour and energy efficiency. Simplified analytical methods to estimate the U -value of building elements could be very useful to designers. However, the analytical methods applied to lightweight steel framed (LSF) elements have some specific features, being more challenging to use and to obtain a reliable accurate U -value with. In this work, the main analytical methods available in the literature were identified, the calculation procedures were reviewed and their accuracy was evaluated and compared. With this goal, six analytical methods were used to estimate the U -values of 80 different LSF wall models. The obtained analytical U -values were compared with those provided by numerical simulations, which were used as reference U -values. The numerical simulations were performed using a 2D steady-state finite element method (FEM)-based software, THERM. The reliability of these numerical models was ensured by comparison with benchmark values and by an experimental validation. All the evaluated analytical methods showed a quite good accuracy performance, the worst accuracy being found in cold frame walls. The best and worst precisions were found in the Modified Zone Method and in the Gorgolewski Method 2, respectively. Very surprisingly, the ISO 6946 Combined Method showed a better average precision than other two methods, which were specifically developed for LSF elements.

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“…The space between the studs can be filled with mineral wool which additionally improves thermal insulation of the interior and can serve as a soundproofing layer. It should be noted that linear thermal bridges can be formed near the locations of steel sections of the framing [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Framing for Securing Drywall Panels on Thermal and Humidity Parameters of the Outer Walls

Major

Kosiń

2017

Civil and Environmental Engineering

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The paper analyses the effect of steel framing used to secure drywall panels on thermal and humidity properties of outer walls. In the practice of building a light structure, the most popular components are steel and wood studs. They are used to obtain framing for building a wall (an outer wall in this study). Analysis presented in this study concerned the corner of the outer wall build using the technology of light steel framing. Computer simulation was used to perform thermal and humidity analysis for the joint of the outer wall.

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The Effectiveness of Thermal Insulation in Lightweight Steel-Framed Walls with Respect to Its Position

Cited by 54 publications

References 20 publications

Thermal transmittance of lightweight steel framed walls: Experimental versus numerical and analytical approaches

Thermal transmittance of lightweight steel framed walls: Experimental versus numerical and analytical approaches

Analytical Methods to Estimate the Thermal Transmittance of LSF Walls: Calculation Procedures Review and Accuracy Comparison

Effect of Steel Framing for Securing Drywall Panels on Thermal and Humidity Parameters of the Outer Walls

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