The Envelope Thermal Test Unit (ETTU): Full Measurement of WallPerform ance

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There are many ways of calculating the dynamic thermal performance of walls and many ways of measuring the performance of walls in the laboratory, relatively few field measurements have been made of the dynamic performance of wall in situ. Measuring the thermal performance of walls in situ poses two separate problems: measuring the heat fluxes and surface temperatures of the wall, and reducing this data set into usable parameters. We have solved the first problem by developing the Envelope Thermal Test Unit (ETTU). ETTU consists of two specially constructed polystyrene blankets, 1.2m square, placed on either side of the test ... continued below

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Sonderegger, R.C.; Sherman, M.H. & Adams, J.W. October 1, 1981.

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There are many ways of calculating the dynamic thermal performance of walls and many ways of measuring the performance of walls in the laboratory, relatively few field measurements have been made of the dynamic performance of wall in situ. Measuring the thermal performance of walls in situ poses two separate problems: measuring the heat fluxes and surface temperatures of the wall, and reducing this data set into usable parameters. We have solved the first problem by developing the Envelope Thermal Test Unit (ETTU). ETTU consists of two specially constructed polystyrene blankets, 1.2m square, placed on either side of the test wall that both control and measure the surface fluxes and surface temperatures of the wall. To solve the second problem we have developed a simplified dynamic model that describes the thermal performance of a wall in terms of its steady-state conductance, a time constant, and some storage terms. We have used ETTU in the field to measure the thermal performance of walls, and have applied our simplified analysis to calculate simplified thermal parameters from this data set. In this report, we present the in-situ measurements made to date using ETTU, and the resulting model predictions. The agreement between measured and predicted surface fluxes demonstrates the ability of our test unit and analytic model to describe the dynamic performance of walls in situ.

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  • Third International Symposium on EnergyConservation in the Built Environment, Dublin, Ireland, March 30-April 1,1982

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  • Report No.: LBL--13436
  • Report No.: DE-82003649/HDM
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 928859
  • Archival Resource Key: ark:/67531/metadc893926

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  • October 1, 1981

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 29, 2016, 8:24 p.m.

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Sonderegger, R.C.; Sherman, M.H. & Adams, J.W. The Envelope Thermal Test Unit (ETTU): Full Measurement of WallPerform ance, article, October 1, 1981; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893926/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.