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Laboratory procedures for using infrared thermography to validate heat transfer models

T¨¹rler, D., Griffith, B.T., Arasteh, D.K.
1997
Insulation Materials: Testing and Applications: Third Volume, ASTM STP 1320, R. S. Graves and R. R. Zarr, Eds., American Society for Testing and Materials

T¨¹rler, D., Griffith, B.T., Arasteh, D.K., (1997), "Laboratory procedures for using infrared thermography to validate heat transfer models", Insulation Materials: Testing and Applications: Third Volume, ASTM STP 1320, R. S. Graves and R. R. Zarr, Eds., American Society for Testing and Materials.
Abstract:
Infrared (IR) imaging radiometers, which measure relative levels of thermal radiation energy, can be used for noninvasive surface temperature measurements of building thermal envelope components undergoing steady-state heat flow in laboratory thermal chambers. One advantage of IR measurement is that it provides large contiguous sets of surface temperature data which are useful for validating the accuracy of complex computer models that predict heat flow through thermally insulated systems. Because they give such detailed information about surface temperature, IR measurements complement hot-box measurements of heat flow. This paper recommends general procedures for reliable quantitative thermographic measurements in chambers operated for winter heating conditions. Actual surface temperature depends on heat flow, surface emittance, and environmental conditions such as air temperature, air flow field, and background thermal radiation. The infrared temperature measurements are affected by many of the same factors including surface emittance, air temperature, background thermal radiation, and air humidity. Equipment specifications for the absolute accuracy of infrared temperature measurements are typically ¡À1¡ã to ¡À2¡ãC. Measurements that use a temperature-controlled reference emitter to remove error appear to show accuracies of ¡À0.5¡ãC for flat specimens with low temperature gradients.

Keywords:

infrared temperature measurements, quantitative thermography, laboratory hot-box, thermography procedures, computer model validation, condensation resistance, surface temperature measurement

Download: http://windows.lbl.gov/irlab/papers/38925.pdf

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Author Information and Other Publications Notes
T¨¹rler, D.
  1. Gas-filled panels: an update on applications in the building thermal envelope
  2. Surface temperatures of insulated glazing units: infrared thermography laboratory measurements  
Griffith, B. T.
Building Technologies Program, Energy and Environment Division, Lawrence Berkeley National Laboratory, University of California Berkeley, CA 94720 USA
  1. Assessment of the technical potential for achieving net zero-energy buildings in the commercial sector
  2. Contrasting the capabilities of building energy performance simulation programs
  3. Framework for coupling room air models to heat balance model load and energy calculations (RP-1222)
  4. Gas-filled panels: an update on applications in the building thermal envelope
  5. Issues associated with the use of infrared thermography for experimental testing of insulated systems
  6. Surface temperatures of insulated glazing units: infrared thermography laboratory measurements
  7. Surface temperatures of window specimens: infrared thermography laboratory measurements  
Arasteh, D. K.
     


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