Calculate the thickness of the magnesia insulation necessary to restrict the heat loss to 5 BTU/hr-ft2 through the walls of a furnace having inside and ambient temperatures of 1500 oF and 150 oF, respectively. The furnace wall is ¼ in, steel plate and 3 in refractory lining. Thermal conductivity in BTU/hr –ft-oF are kref = 0.6, ksteel = 26, kmag=0.03

A spherical tank made up of stainless steel is to be used for storage of oil at 150°Cthat is needed for heating purposes in a plant. It is decided to insulate the tank in order todecrease the heat loss to the surroundings, which is at 20°C having heat transfer coefficient of 25W/m2.K. The heat loss is compensated by the heating resistance inside of the tank. There are twotypes of insulating material present at this plant each is enough for covering the tank with onlyone layer. These are;Type 1: k=0.1 W/m.K thickness=5cmType 2: k=0.25 W/m.K thickness=5cmAn engineer is thinking about the most efficient way of covering the tank in order to minimize theheat loss. Please help him for this purpose. Is it more efficient to cover type 2 over type 1 or type1 over type 2? Explain why?

In 1 paragraph, make a narrative of what you have learned in Heat Transfer