Thermal performance of steel-framed walls. Final report

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In wall construction, highly conductive members spaced along the wall, which allow higher heat transfer than that through less conductive areas, are referred to as thermal bridges. Thermal bridges in walls tend to increase heat loss and, under certain adverse conditions, can cause dust streaking (``ghosting``) on interior walls over studs due to temperature differentials, as well as condensation in and on walls. Although such adverse conditions can be easily avoided by proper thermal design of wall systems, these effects have not been well understood and thermal data has been lacking. Therefore, the present study was initiated to provide (1) ... continued below

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66 p.

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Barbour, E.; Goodrow, J.; Kosny, J. & Christian, J.E. November 21, 1994.

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Description

In wall construction, highly conductive members spaced along the wall, which allow higher heat transfer than that through less conductive areas, are referred to as thermal bridges. Thermal bridges in walls tend to increase heat loss and, under certain adverse conditions, can cause dust streaking (``ghosting``) on interior walls over studs due to temperature differentials, as well as condensation in and on walls. Although such adverse conditions can be easily avoided by proper thermal design of wall systems, these effects have not been well understood and thermal data has been lacking. Therefore, the present study was initiated to provide (1) a better understanding of the thermal behavior of steel-framed walls, (2) a set of R-values for typical wall constructions, and (3) information that could be used to develop improved methods of predicting R-values. An improved method for estimating R-value would allow an equitable comparison of thermal performance with other construction types and materials. This would increase the number of alternative materials for walls available to designers, thus allowing them to choose the optimum choice for construction. Twenty-three wall samples were tested in a calibrated hot box (ASTM C9761) to measure the thermal performance of steel-framed wall systems. The tests included an array of stud frame configurations, exterior sheathing and fiberglass batt insulations. Other studies have not included the use of insulating sheathing, which reduces the extent of the thermal bridges and improves total thermal performance. The purpose of the project was to provide measured R-values for commonly used steel-framed wall configurations and to improve R-value estimating methods. Test results were compared to R-value estimates using the parallel path method, the isothermal planes method and the ASHRAE Zone method. The comparison showed that the known procedures do not fully account for the three-dimensional effects created by steel framing in a wall.

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66 p.

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OSTI as DE96000665

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  • Other Information: PBD: 21 Nov 1994

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  • Other: DE96000665
  • Report No.: DOE/OR/21400--T484
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/111848 | External Link
  • Office of Scientific & Technical Information Report Number: 111848
  • Archival Resource Key: ark:/67531/metadc624875

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  • November 21, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Aug. 3, 2016, 1:59 p.m.

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Barbour, E.; Goodrow, J.; Kosny, J. & Christian, J.E. Thermal performance of steel-framed walls. Final report, report, November 21, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc624875/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.