Abstract
This paper aims to find out the distinction of bed mattress fire behavior (mainly, surface flame spread of mattress) in compartment compared to non-compartment condition and to investigate the effect of the frame height of bed mattress upon the smoke layer in compartment. Toward this purpose, a series of full-scale bed mattress tests with different frame heights were conducted according to ISO 12949. The results in compartment were measured in terms of factors such as heat release rate, total heat release, surface flame spread of bed mattress by thermocouple, and temperature of smoke layer, where some results were compared with non-compartment condition. Compared to non-compartment, compartment result clearly shows the difference of skyrocketing tendency in HRR and THR depending on different frame height. Flame spread in the bottom surface of mattress reached to the opposite edge faster than the top surface’s flame in compartment. This phenomenon is a unique distinction in bed mattress only in compartment since it did not occur in non-compartment. In addition, this phenomenon increasingly appeared in higher frame of bed mattress in compartment. Moreover, commonly through all of five frame heights (0, 115, 215, 315, and 515 mm), most of temperatures in thermocouples near the ceiling part of compartment showed higher temperature value than thermocouples near floor of compartment, and higher frame condition increased higher temperature of smoke layer in compartment. Therefore, it could be inferred that even if the bed mattress consists of same materials, higher frame of bed mattress is able to cause the fire behavior in compartment to be more severe as compared to non-compartment. In addition, higher frame height under bed mattress may indicate the volume of thermal convection in airflow. Even, considering the estimation results on radiative heat flux, frame height would affect on the radiation emitted from smoke layer in compartment.
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