Using an appropriate table and simple calculation, identify the shape factors, heat circuit and heat exchange by radiation for all surface of the furnace shows in Figure 1. 2m 1.5m (A4) im (A2) (43) TAL Dimension T A1 AZ A3 FLOOR END WALL SIDE WALL 2mx15m Im 1.5 m 1m 2m 1000K T2 T3 well insulated reradiating AH ROOT 2 m 1.5 m GOOK Figure 1 Dimension and characteristic of thin wall fumace with a size of 1 m * 2 mx 1.5 m (18 marks)