コーンカロリーメータ試験装置と着火性試験装置における材料表面の熱伝達 [in Japanese] SPECIMEN SURFACE HEAT TRANSFER IN CONE CALORIMETER AND IGNITABILITY TEST APPARATUS [in Japanese]
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To investigate the specimen's surface heat balance of the ISO 5660 cone calorimeter (CCM) and ISO 5657 ignitability test apparatus, galvanized thin steel plate (0.27mm) was heated. CCM tests were carried out in horizontal and vertical orientations. The steady state surface temperatures were measured for heating intensities up to 60kW/m<sup>2</sup>. The corresponding surface temperatures were up to 720℃. The specimen's surface heat balance was estimated by measured surface temperatures. In all the results, re-radiation by surface dominated the heat loss. Convection and conduction heat loss are relatively small. In comparison of horizontal and vertical CCM results, there was no obvious difference if the heating intensity is below 40kW/m<sup>2</sup>. Above 40kW/m<sup>2</sup>, when the surface temperature is higher than 600℃, the convection heat loss was larger in vertical orientation. In case of ignitability test apparatus, convection heat loss is smaller than horizontal CCM, but the conduction heat loss was about six times larger. The estimated convective heat transfer coefficient was around 0.013-0.015 kW/(m<sup>2</sup>・K) in CCM for the surface temperature range of 200 to 400℃. Above 600℃, the coefficient tends to increase in vertical CCM. On the other hand, the convective heat transfer coefficient in ignitability test apparatus is about 0.006 kW/(m<sup>2</sup>・K), which is about half to one third of the values in CCM.
- Journal of Environmental Engineering (Transactions of AIJ)
Journal of Environmental Engineering (Transactions of AIJ) 80(709), 193-201, 2015
Architectural Institute of Japan