1. The problem statement, all variables and given/known data A wall is required to be insulated by embedding wood within concrete. the total thickness of the concrete and wood are 10cm and 1 cm respectively and are fixed due to structural constraints. determine the minimum heat leak into the room if the location of the wood can be changed within the concrete. Take K for wood as 0.1w/mk and for concrete 1.0w/mk Please help. 2. Relevant equations thermal resistance 3. The attempt at a solution I tried solving using thermal resistance concept by equating derivative of the total thermal resistance to 0, but not able to get the answer.