Correlation of Heat Release Calorimetry Measurements

摘要

The Ohio State University (OSU) Rate of Heat Release Apparatus specified in FAR Part 25.853 (a-1) defines both apparatus test conditions and pass/fail criteria for large surface area aircraft interior materials, such as sidewall panels, bulkheads, and stowage bins. The cone calorimeter (ASTM E-1354 Standard Test Method for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen consumption Calorimeter) similarly measure heat release rates from materials subjected to a constant external heat flux. However, heat release from the cone calorimeter is calculated by measuring the decrease in oxygen concentration in a stream of air flowing over the test specimen, rather than the temperature (enthalpy) increase of the air stream leaving the device, as is done with the OSU Rate of Heat Release Apparatus. This report will examine the differences between measurement of convective, radiant, and total heat release rates, and discuss techniques to obtain substantial conformity between the two techniques. Results for both methods are compared for single-ply, bisphenol-A epoxy-impregnated glass cloth.