2. (30 points) Mr. and Mrs. Beaver are repairing their home oven, the internal material exposed...

Question:

2. (30 points) Mr. and Mrs. Beaver are repairing their home oven, the internal material exposed to hot temperatures and the insulation material exposed to outside air have come apart. Let us try to help them analyze their oven. A household oven can be modeled as shown in the diagram below. Neglecting the radiative heat transfer, do the following: a. Draw a thermal resistance diagram for the oven system indicating all the different types of heat transfers occurring. (5 points) b. What is the net heat transfer rate per unit area between the hot air inside the oven and the cold air outside in terms of Th, T, Li, ki, Lw, kw, hy and hc. (10 points) c. Determine the temperature T at the interface between the wall and insulation in terms of The Tc, Li, ki, Lw, ku, hn and hc. (10 points) d. Mr. and Mrs. Beaver are planning to use an adhesive to stick the insulation to the oven wall. Mr. Beaver wants to get adhesive “A” which can withstand temperatures up to 150 °C whereas Mrs. Beaver wants an adhesive “B” which can withstand a temperature of 180 °C. Who is correct and why? if Th= 200 °C. To = 25 °C, kw= 2ki, Lw = 0.5Lị and hh = 4hc (5 points) Let's buy "A" T Let's buy "B" TW hn he Li, ki Th,Hot Lwo kwat Tc, Cold

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