3. A thin electrical heater is wrapped around the outer surface of a long cylindrical tube whose inner surface is maintained at a temperature of 6°C. The tube wall has inner and outer radii of 24 and 78 mm, respectively, and a thermal conductivity of 10 W/m K. The thermal contact resistance between the heater and the outer surface of the tube (per unit length of the tube) is R' t.c = 0.01 m· K/W. The outer surface of the heater is exposed to a fluid with To = -10°C and a convection coefficient of h = 100 W/m2. K. %3D Determine the heater power per unit length of tube required to maintain the heater at To = 25°C

Match the following v Identify correctly Spatial arrangement and connection of different components of your product a. Problem definition b. Parametric design v Preliminary selection of materials, sizing of parts c. Gather information v Tolerances d. Concept generation v House of quality e. Concept evaluation v Brain storming f. configuration design vEngineering drawings g. Product architecture h. Detail design

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