I am an ME with my years of heat transfer approx. 20 years back. I have a 3' x 7' insulated sub floor that utilizes an electric heat mat (2' x 5'). The heat mat is on top of the sub floor. Oh and a reflective layer between the heat mat and the sub floor. Finally I have a .100" diamond plate on top. My heat mat puts out 150 watts, 1.3 amps, 96 ohms. Being the mat is 10 ft^2, that is 15 watts ft^2 which transfers to 400.92 btu/hr. (I think). This whole unit will store a motorcycle in a garage with a cover. So assume natural convection. I am stumbling and/or confused on the method to find the heat transfer I can expect through the .100" alum. plate to know if my mat is capable. I know for the most part this is basic but do I need lumped capacitance etc? Any help is more than appreciated. Thank you so much!