Question: A pre-fabricated building has an interior wall with a thin decorative layer made of acrylic plastic. The thin acrylic sheet has a thickness of 0.3

A pre-fabricated building has an interior wall with a thin decorative layer made of acrylic plastic. The thin acrylic sheet has a thickness of 0.3 mm and is backed by an insulation board. Assume the sheet losses heat with a total (convective and radiative) heat transfer coefficient of 30 W/m 2 K to the ambient surroundings at 25 C. Use values for PMMA in Quintiere Table 7.6 with an ignition temperature of 380 C. a. What is the critical or minimum heat flux required for ignition? b. Calculate the time to ignition of the acrylic sheet when a portion of the sheets surface is exposed to an incident radiation heat flux of 40 kW/m2

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