IN-SITU MEASUREMENT OF WALL THERMAL PERFORMANCE: DATAINTERPRETATION AND APPARATUS DESIGN RECOMMENDATIONS

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Description

Although the U-values of many building materials have been determined by laboratory testing, the in-situ thermal performance of walls, under either static or dynamic conditions, is not so well documented. This report examines the use of field measurements of heat flow and surface temperatures to determine the dynamic as well as static thermal performance of walls. The measurement strategies examined include both active devices, which generate their own heat fluxes on the wall surfaces, and passive devices, which rely on the weather to induce the required fluxes and temperature differences. Data obtained with both devices are analyzed with the Simplified ... continued below

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29 p.

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Modera, M.P.; Sherman, M.H. & de Vinuesa, S.G. September 1, 1984.

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Description

Although the U-values of many building materials have been determined by laboratory testing, the in-situ thermal performance of walls, under either static or dynamic conditions, is not so well documented. This report examines the use of field measurements of heat flow and surface temperatures to determine the dynamic as well as static thermal performance of walls. The measurement strategies examined include both active devices, which generate their own heat fluxes on the wall surfaces, and passive devices, which rely on the weather to induce the required fluxes and temperature differences. Data obtained with both devices are analyzed with the Simplified Thermal Parameter (STP) model, which was designed to characterize a wall from flux and temperature measurements rather than from assumed material characteristics. The active measurement data are also analyzed with a modified version of the STP model that takes into account lateral heat losses. Some possible sources of error for both active and passive measurement strategies are also examined, and recommendations for both measurement strategies are given.

Physical Description

29 p.

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  • Report No.: LBL--17773
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/928698 | External Link
  • Office of Scientific & Technical Information Report Number: 928698
  • Archival Resource Key: ark:/67531/metadc894631

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • September 1, 1984

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 3, 2016, 7:57 p.m.

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Modera, M.P.; Sherman, M.H. & de Vinuesa, S.G. IN-SITU MEASUREMENT OF WALL THERMAL PERFORMANCE: DATAINTERPRETATION AND APPARATUS DESIGN RECOMMENDATIONS, report, September 1, 1984; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc894631/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.