b'Delta MW and EPS-FR Panel Awning and Patio Roof System Appendix A Assessment of Heat Conduction Through a Steel Member A.1Introduction A one-dimensional finite difference heat transfer calculation is undertaken to determine the temperature distribution through a steel purlin (approximated as a solid steel rod) when exposed on one face to a V2.3.1.3 fire source feature on the site boundary. The simplified model is shown in Figure 5-1.The aim of the assessment is to establish whether conduction through a steel member along the Type I panel (metal facings, metal support structure or metal plumbing fixtures) of the Delta MW and EPS-FR roof system may result in ignition of the EPS-FR core within the adjacent Type II panel of the roof system.Non-combustible portion within 900Rate of conduction is proportional to mm of site boundarycross-sectional area i.e. a higher rate of (i.e. Panel Type I)conduction is expected through a thick gauge steel member than through thin steel sheeting. As such, conduction is assessed through a steel purlin which is approximated as a steel rod. Solid cross-sectional area Face exposed to heat0.008 m 2AXONOMETRIC VIEW FROM ABOVE 900mm One-dimensional heat path through steel rod showing nodes used for heat transfer analysis Non-combustible( x = 0.1 m)portion within 900 mm of site boundary AXONOMETRIC VIEW FROM BELOWFigure 5-1. Finite Difference Heat Transfer Analysis Paths to assess heat transfer through a steel member via conduction.A.2Methodology The finite difference heat transfer equation used for calculating the temperature distribution through the steel rod is given below: ( ) ( ) = [ 1+ +1 (20)( 4293 4 )]+ ,1+1,Revision 1-437'