ECE309 Midterm: ece309f_s04q
31 Jan 2019
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Read the questions very carefully: clearly state all assumptions, it is your responsibility to write clearly and legibly, when using correlations, it is your responsibility to verify that all limiting conditions are satis ed. An oil storage tank is designed to maintain the oil temperature at a uniform 400 k by using a submerged resistance heating element. The storage tank consists of a cylindrical section that has a length of 2 m and an outer diameter of 1 m with the end caps being formed from two hemispherical sections as shown in the gure below. The tank is constructed from 20 mm thick glass (pyrex, k = 1. 4 w/m k). The surrounding ambient air temperature is t = 300 k and the convective heat transfer coef cient over the full outer surface of the tank is 5 w/(m2. For the cylindrical section we know rcr,cylinder = k/h.
