The heat loss from a fin is 6W. The effectiveness and efficiency of the fin are 3 and 0.75 respectiveley. The heat loss from the fin, keeping the entire fin surface at base temperature.
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- Determine the rate of heat transfer per meter length from a 5-cm-OD pipe at 150C placed eccentrically within a larger cylinder of 85 magnesia wool as shown in the sketch. The outside diameter of the larger cylinder is 15 cm and the surface temperature is 50C.3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is , estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.A transformer that is L=20cm long, 6.2 cm wide, and 5 cm high is to becooled by attaching a 10 cm × 6.2 cm wide polished aluminum heatsink (emissivity =0.03) to its top surface. The heat sink has seven fins,which are 5 mm high, 2 mm thick, and 10 cm long. A fan blows air at25°C parallel to the passages between the fins. The heat sink is todissipate 20 W of heat and the base temperature of the heat sink is notto exceed 60°C. Assuming the fins and the base plate to be nearlyisothermal and the radiation heat transfer to be negligible, determinethe minimum free-stream velocity the fan needs to supply to avoidoverheating. (k=0.02681W/m˚C, Pr=0.7248, V= 1.726×10-5 m2/s, )
- Compare the value between the the actual heat transfer rate Qactual for the surface with fins and the surface without fin ?A total of 10 rectangular aluminum fins (k =203 W/m·K) are placed on the outside flat surface of anelectronic device. Each fin is 100 mm wide, 20 mm highand 4 mm thick. The fins are located parallel to each otherat a center-to-center distance of 8 mm. The temperature atthe outside surface of the electronic device is 60°C. The airis at 20°C, and the heat transfer coefficient is 100 W/m2·K. Determine (a) the rate of heat loss from the electronic device to the surrounding air and (b) the fin effectiveness.Except for using table for getting thermal efficiency of fins, How can I derive a formula?
- The hot water pipe of a heating system, 20 m long and 8 cm in diameter, was buried 80 cm below the soil surface. The outer surface temperature of the pipe is 60 °C. Find the heat loss rate in the pipe by taking the surface temperature of the soil as 5°C and the thermal conductivity of the soil at that location as 0.9 W/m°C.Two pin fins are identical, except that the diameter of one of them is twice the diameter of the other. For which fin is the (a) fin effectiveness and (b) fin efficiency higher? Explain./ Hot square plate (1 m ×1 m) is to be cooled by attaching aluminum circular pin fins (D=0.25 cm, L= 3 cm) distributed with distance 0.6 cm as illustrated in Figs.(1-a) & (1-b). If the fin base temperature is 100°C, cooling air temperature is 30°C and h= 35 W/m. °C. Determine the total rate of heat transfer from the finned plate and the effectiveness of the fins? Assume k= 237 W/m.°C and nr=tanh mL/ mL.
- The volume of material available for a pin of square section is 4cm^3. The conductivity of the material is 140w/mk and the convection coefficient is 50 w/m^2k. Determine the size of fin for maximum heat flowA plane wall (0.8 m x 0.6 m) at 10 oC is to be heated by attaching 7-cm-long, 3-mm-diameter pin fins (k=200 W/mK, ρ=5000 kg/m3) to it. nfin=200 fins are to be used in total. Temperature of the surrounding fluid is 100 oC, and the heat transfer coefficient on the surfaces is 35 W/m2K. Total (material + manufacturing) cost of the fins is 850 TL/kg. Fill the table below by neglecting heat transfer from the fin tips. nfin=? a) Fin efficiency b) Fin effectiveness c) Overall fin effectiveness d) Total cost of finsCalculate the heat transfer rate from a single-pane glass window with aninside surface temperature of approximately 20° C and an outside surfacetemperature of 5° C . The glass is 1 m tall, 1.8 m wide, and 8 mm thick, asshown . The thermal conductivity of the glass is approximatelyk = 1.4 W⁄m ·K .