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A PROCEDURE FOR MEASURING THE DYNAMIC THERMAL PERFORMANCE OF WALL SPECIMENS USING A CALIBRATED HOT BOX.

Author(s) : BURCH D. M.

Summary

A COMPOSITE WALL SPECIMEN IS INSTALLED BETWEEN THE METERING AND CLIMATIC CHAMBERS OF A CALIBRATED HOT BOX, AND A TIME-DEPENDENT OUTDOOR CLIMATIC CONDITION, SUCH AS A SOL-AIR DIURNAL TEMPERATURE CYCLE, IS GENERATED IN THE CLIMATIC CHAMBER. THE METERING CHAMBER IS MAINTAINED AT A TYPICAL INDOOR CONDITION AND IS USED AS A CALORIMETER. THE TRANSIENT HEAT-TRANSFER RATE THROUGH THE WALL SPECIMEN AT HOURLY TIME STEPS IS DETERMINED FROM AN ENERGY BALANCE OF THE METERING CHAMBER. IN THE ENERGY BALANCE, THE TIME-DEPENDENT HEAT-TRANSFER RATE THROUGH THE SPECIMEN SUPPORT FRAME IS PREDICTED USING A FINITE-DIFFERENCE MODEL, AND THE ENERGY-STORAGE RATE WITHIN THE METERING CHAMBER IS PREDICTED USING A SEMI-EMPIRICAL MODEL. A DYNAMIC CALIBRATION TEST WAS CONDUCTED TO INVESTIGATE THE ACCURACY OF THS PROCEDURE. THE TRANSIENT HEAT-TRANSFER RATES ASSOCIATED WITH THE SPECIMEN SUPPORT FRAME AND ENERGY STORAGE WITHIN THE METERING CHAMBER WERE SHOWN TO BE IMPORTANT ELEMENTS.

Details

  • Original title: A PROCEDURE FOR MEASURING THE DYNAMIC THERMAL PERFORMANCE OF WALL SPECIMENS USING A CALIBRATED HOT BOX.
  • Record ID : 1988-2430
  • Languages: English
  • Publication date: 1987
  • Source: Source: ASHRAE Trans.
    vol. 93; n. 2; 105-119; 7 fig.; 1 tabl.; 7 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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