You have recently been hired at a factory in Santi- aug. The plant has an industrial furnace, which consists of a frame

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You Have Recently Been Hired At A Factory In Santi Aug The Plant Has An Industrial Furnace Which Consists Of A Frame 1 (90.23 KiB) Viewed 36 times

You have recently been hired at a factory in Santi- aug. The plant has an industrial furnace, which consists of a frame of steel lined inside with refractory bricks (e = 0.3 m; k brick = 1.0 W- m-1.K-1), and on the outside with a layer of insulating wool (e = 0.2 ma; k wool = 0.7 W-m-1 K- 1), as shown in Fig. 1. The oven is kept at I; = 1000°C, and you measured a temperature of T. = 30°C around the oven. It was estimated that the total heat transfer coefficient (convective + radiative) inside the furnace is h; = 50 W.m-2.K-1 and outside is from he = 20 W-m-2.K-1 a) Calculate the global heat transfer coefficient for the walls of the oven. Do all the calculations for one meter of wall width (dimension perpendicular to the figure). b) Calculate the heat losses by conduction through the walls if the oven is 2 m high, 3 m wide and 6 m long. c) Another engineer (graduated from another university) raised the option of installing an extra cover of expanded polystyrene insulation (Aislapol) in the outer face of the oven. You, who are aware of the effect of heat on the materials, especially plastics, searched the internet and discovered that it is It is advisable to keep the expanded polystyrene at lower temperatures at 100°C. Comment if it is advisable to install this type of insulation. d) Comment on whether the assumption of one-dimensional conduction by the oven walls. Hint: Assume one-dimensional, steady-state conduction, con- Considering that all surfaces normal to the direction a are isothermal. You must find the properties of structural steel 1000 200 Lana 300 Ladrillo Acero 200 1051 1 de 1 15