A fin of diameter d W 0.3 cm, length L = 2 cm, and conductivity k = 138 is dissipating heat m. K from a surface at 100 °C. The ambient air is at T. 20 °C and the convection heat transfer coefficient is h = 10 2. Using the adiabatic fin method equations (fin with negligible heat loss at m2.K the tip) along with the corrected fin length, Lc, find the rate of heat dissipated by the fin (in Watts).

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w