Q1 A wall composite comprises of a combination of different types of materials with sectional area and thickness as listed in Table Q1. The wall composite is arranged and exposed to inside and outside environment as illustrated in Figure Q1. Figure Q1 Composite wall arrangement with combination materials Assuming heat transfer through the composite wall is in steady-state, (a) Illustrate the thermal resistance network of this arrangement. (4 marks) (b) Calculate the overall heat-transfer coefficient. (14 marks) (c) If the overall temperature difference is 80C, calculate the heat transfer rate. (2 marks)