Thermal evaluation of several configurations of insulation and structural materials for some metal stud walls

Kośny, Jan; Christian, J.E.

doi:10.1016/0378-7788(94)00913-5

Cited by 47 publications

(26 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(iv) whenever possible, try to use two layers of perpendicular steel studs, avoiding trespassing the entire wall cross-section with two parallel steel profiles. Kosny and Christian [164] also showed that the use of continuous external thermal insulation is an efficient way to improve the thermal performance of LSF walls. Moreover, they showed that increasing the space between the steel profiles allows increasing the thermal resistance of the walls.…”

Section: Lightweight Construction -Lsf Assembliesmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

View full text Add to dashboard Cite

The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behaviour of construction elements, considering laboratory conditions and in-situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GHP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy-and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of nonhomogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. hot box; calibrated hot box; infrared thermography. Highlights: -Review on the main methods to measure the U-value of non-homogeneous walls. -Methods: heat flow meter, guarded hot plate, guarded and calibrated hot box, infrared thermography. -Standards framework and discussion of the main advantages and drawbacks of each method. -Description of methodologies and working principles of laboratory and in-situ measurements. -Measurement of the thermal transmittance of different heavy-and light-weight walls.

show abstract

Section: Lightweight Construction -Lsf Assembliesmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

View full text Add to dashboard Cite

show abstract

“…The numerical solutions were developed using Heating 7.3 and by using very fine grids and time steps based on a grid dependency study to minimize numerical errors. Heating 7.3 is verified finite difference heat transfer software (Bryan et al 1986, Childs 2005) that has been used in previous independent studies (Kosny andChristian 1995, Petrie et al 1997). For robustness, the authors also tested the six analytical solutions in Heating 7.3 and obtained accurate results for all of them.…”

Section: Proposed Additional Test Casesmentioning

confidence: 99%

Diagnostic test cases for verifying surface heat transfer algorithms and boundary conditions in building energy simulation programs

Tabares-Velasco

Griffith

2012

Journal of Building Performance Simulation

View full text Add to dashboard Cite

Verification and validation are crucial in developing and implementing models. Although there are standards to test energy simulation software, this article describes an additional set of eight test cases that are a combination of analytical cases and numerical cases for solid conduction heat transfer. These tests focus on diagnosing and verifying conductive heat transfer algorithms and boundary conditions in building envelopes or fabrics. As an example, EnergyPlus versions 5, 6 and 7 are tested using these eight test cases. The test cases were useful for detecting several bugs in the code. The authors recommend these test cases as useful complements to existing verification test cases for building envelopes.

show abstract

“…Numerically, it was estimated that thermal bridges can increase till 20% thermal loads and energy needs of buildings, according to various international references as, for instance, the French CSTB (2000). Kosny and Christian (1995) demonstrated that the thermal resistance of a concrete wall reinforced with steel profiles may diminish also around the 48%, because of the iron thermal bridge effects. Furthermore, Kosny and Kossecka (2002) showed that the calculation of a thermal resistance of a wall, neglecting the thermal bridges and adopting the one-dimensional approach, can induce underestimation around the 44%.…”

Section: Introductionmentioning

confidence: 98%

Transient heat transfer through walls and thermal bridges. Numerical modelling: Methodology and validation

Ascione

de'Rossi

Bianco

et al. 2012

Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC)

View full text Add to dashboard Cite

The current advanced numerical codes for the energy audits carry out 0-dimensional simulation (i.e., one computational node representing the thermal zone), underestimating the effects of thermal bridges on the seasonal heating demand of buildings. The paper suggests a numerical resolution model, implemented in Matlab, aimed to be transferred in numerical engines for the hourly energy simulation. The proposed methodology solves common thermal bridges in buildings, evaluating their effects on the energy demand. Typical thermal bridges have been studied and implemented, analyzing the reliability of the methodology, in terms of accuracy, computational time, required sources, comparing the solutions with those derived by computational fluid dynamic codes. The method reveals very satisfactory results, both as regards the computational time and CPU sources required, as well as with reference to the reliability. Moreover, the solution stability is commonly very high, regardless the chosen computational time-step.

show abstract

Thermal evaluation of several configurations of insulation and structural materials for some metal stud walls

Cited by 47 publications

References 4 publications

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Diagnostic test cases for verifying surface heat transfer algorithms and boundary conditions in building energy simulation programs

Transient heat transfer through walls and thermal bridges. Numerical modelling: Methodology and validation

Contact Info

Product

Resources

About