Time Constraints on Measuring Building R-Values,

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. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1980
Accession Number
ADA089712

Entities

People

  • Stephen N. Flanders

Organizations

  • Cold Regions Research and Engineering Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Civil Engineering
  • Climate Change
  • Cold Regions
  • Composite Materials
  • Construction
  • Construction Materials
  • Differential Equations
  • Engineering
  • Engineers
  • Equations
  • Heat Flux
  • Heat Transfer
  • Heat Transmission
  • Laboratory Tests
  • Materials
  • Thermal Conductivity
  • Thermal Resistance

Readers

  • Theoretical Analysis.
  • Thermal Physics or Thermal Science.