pizza oven has an interior temperature of 250◦C and the outside ambient kitchen temperature is 25◦C. The oven is made of brick 20 cm thick of thermal conductivity kb = 1 W/m/K. It is covered with an insulating material 1 cm thick of conductivity ki = 0.05 W/m/K. The heat transfer coefficient at the insulation surface is h = 15 W/m2/K, while the heat transfer coefficient at the inner surface of the oven has a very large value. Assume a planar (slab) geometry. Determine (a The heat flux from the oven (b If the heat flux is to be reduced to 400 W/m2, what additional thickness of insulation will be required?

Consider a wall with multiple layers. First layer is 20cm thick brick with 0.66 heat conductivity coefficient, second layer is 3cm thick grout with 0.6 heat conductivity coefficient, third layer is 8cm thick lime with 0.58 heat conductivity coefficient and the outer layer 1.2 cm thick grout with 0.6 heat conductivity coefficient. Walls inner and outer heat conductivity coefficient with order is 5.6 w/m2K and 11w/m2K. The room temperature is 22C and outside temperature is -5C. With these information please calculate the questions below. a) Total heat transfer coefficientb) Total heat resistancec) Total heat transfer d) surface temperature difference between grout and lime

The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of the wall material is 0.1 W/m K and the insulation material is 0.01 W/m K. The furnace operates at 650 0C and the ambient temperature is 30 0 Allowable temperature on the outer side of the insulation is 1000C. Determine the overall heat transfer by conduction per unit area occurring across a furnace wall made from clay. If the air side heat transfer coefficient is 0.4 W/m2 K, calculate the minimum insulation thickness requirement.

The efficiency of a single cylindrical cross-section fin is 85%. The diameter of the fin is 13 mm and it extends 32 mm from the base. The base is 65 K hotter than the surrounding fluid, and the heat transfer coefficient is 32 W/m2K. How many fins would be required to increase heat transfer from the base by 50 W? Give your answer as an integer.