Control Stability of a Heat-Flow-Meter Apparatus
- 1 October 1994
- journal article
- research article
- Published by SAGE Publications in Journal of Thermal Insulation and Building Envelopes
- Vol. 18 (2) , 116-127
- https://doi.org/10.1177/109719639401800203
Abstract
Calibration measurements of a commercial heat-flow-meter appara tus are presented. The apparatus has been calibrated using the same specimen of high-density fibrous-glass board over a period of four years, from 1989 to 1993. Seventy-three tests have been conducted, generally at ambient conditions of 24°C with a moderate temperature difference of either 15, 22 or 27°C across the specimen. Variations within a set of data for each test have been examined to verify underlying assumptions of randomness, normal frequency distribution of errors, repeatability, and stability of the data. Variations between test data indicate a small drift, on the order of one percent over four years, in the calibration factor of the apparatus. A model has been developed to describe the small drift with time. The analysis of varia tions between test data has also identified intermittent shifts in the precision of the calibration factor of the apparatus.Keywords
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