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Title: Time constraints on measuring building R-values
Authors: Flanders, Stephen N.
Keywords: Cold regions engineering
Construction materials
Time dependence
Thermal resistance
Thermal properties
Building materials
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 80-15.
Description: CRREL Report
Abstract: This report discusses the time constraints on measuring the thermal resistance (R-value) of building components. Temperature changes on either side of a building component perturb measurement accuracy. Long measurement times and measurement times corresponding to a consistent diurnal cycle can be satisfactory; however, individual temperature changes cause significant error for shorter measurement periods. This report shows how to scale the thermal properties of individual constituent materials in a building element to determine its characteristic thermal time constant. The report then demonstrates the size of measurement error resulting from a variety of changes in temperature with representative walls of different time constants.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:CRREL Report

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