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

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.

Indexing

Themes: Other air-conditioning equipment
Keywords: Unsteady state; Climatic chamber; Measurement; Heat transfer; Wall; Air conditioning; Test room