A vertical cylinder 1.5m height and 18 cm in diameter is maintained at 100° C in an atmosphere environment of 20˚C. Calculate the heat loss by free convection from the surface of the cylinder. Use the following data: p=1.06 kg/m³ v= 18.97x10 m²/s, k-0.1042 W/mK and Pr=0.6975 Nu -0.1 (Ra)¹/3
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- An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a resistance of 310-4 ohm per meter of length. If the air around this line is at v, determine the surface temperature on a windy day, assuming a wind blows across the line at 33 km/h.300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe has internal diameter (ID) of 40 cm, and outer diameter (OD) of 42 cm. The pipe is placed in another ss. pipe with ID and OD 44 cm and 44.2 cm, respectively. The gap between the pipes is filled with steel air (use air properties at 160°C from appendix). The convection heat transfer coefficient at the inner and the outer surfaces of the pipe is hi = 40 W/m². K and h2= 15 W/m². K. Determine the rate of heat loss if the length of the pipe %3D is 10 m. Also determine the temperature at inside, intermediate and outer surfaces.300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe has internal diameter (ID) of 40 cm, and outer diameter (OD) of 42 cm. The pipe is placed in another ss. pipe with ID and OD 44 cm and 44.2 cm, respectively. The gap between the pipes is filled with steel air (use air properties at 160°C from appendix). The convection heat transfer coefficient at the inner and the outer surfaces of the pipe is hi = 40 W/m?. K and h2= 15 W/m2. K. Determine the rate of heat loss if the length of the pipe %3D is 10 m. Also determine the temperature at inside, intermediate and outer surfaces.
- Natural Convection: Calculate the heat transfer rate (W) of a 4 m high and 10 m wide large vertical plate which is maintained at 65°C and exposed to atmospheric air at 21°C, with the given properties below: k = 0.0275 W/m-K (thermal conductivity) Pr= 0.7 (Prandtl Number) Vair = 17.2x10-6 m²/s (kinematic viscosity) Vertical plate It L Round off your answer to three (3) decimal places.A food product with 80% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 1000 kg / m³, the thermal conductivity is 1.0 W / (m K), and the initial freezing temperature is -2.25 ° C. After 15 hours in the freezing medium -35 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = Answer W / (m² K).A food product with 73% moisture content in a 5 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -2 ° C. After 12 hours in the freezing medium -30 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = AnswerW / (m² K).
- Two vertical plates, each 200 mm high and at 90°C are placed in a tank of water at 30 °C. Calculate the minimum spacing which will prevent interference of the free convection thermal boundary layers. (k-0.674 W/mK, kinematic viscosity 0.556x 10 m/s, Pr-3.54). If the plates orientation is changed to horizontal what will be the minimum spacing which will prevent interference of the free convection thermal boundary layersYou have to do thermal analysis of a building near an arctic observatory, which has a footprint of 8-mx12-m and height of 4-m and oriented as shown. Because the wind direction and velocities are different on each side wall, the convection coefficient for each wall and roof are different. They are as follows h North 5 W/m².K, h South 24 W/m².K, 15 W/m².K, hEast hwest 12 W/m².K, and hRoof = 30 W/m².K, where the subscript indicate the corresponding wall/roof (for example, North is the convection coefficient for the North-facing wall). The ambient air temperature is -15°C. The sky temperature is -20°C. The solar irradiation is 350 W/m², which can be considered to be falling only on the roof and not on the walls. The surface temperature of the building is 10°C. Neglect heat transfer through the ground. What is the total heat transfer to/from the building? Is the building losing or gaining heat? What is the dominant mode of heat transfer? What is the ratio between the heat transfer rates…A food product with 80% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 1000 kg / m³, the thermal conductivity is 1.0 W / (m K), and the initial freezing temperature is -2 ° C. After 14 hours in the freezing medium -30 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder.
- Q2: A 2.5-cm-diameter steel pipe is maintained at 100'C by condensing steam on the inside. The pipe is to be used for dissipating heat to a surrounding room at 20-C by placing circular steel fins around the outside surface of the pipe. The convection loss from the pipe and fins occurs by free convection, with h = 8.0 W/m C. Examine several cases of fin thickness, fin spacing, and fin outside diameters to determine the overall heat loss per meter of pipe length. Take k 43 W/m C for the steel fins and assume h is uniform over all surfaces. FinsA vertical cylinder 1.5m high and 180 mm in diameter is maintained at 100C in an atmosphere environment of 20C.calculate heat loss by free convection from the surface of the cylinder for air take p=1.06 kg/ m2.v=18.97*10 -6 m2/s.Cp=1.004kJ/kg2C and k=0.1042kJ/ mh2CA 30-m-long hot rod (Diameter = 100-mm) is placed inside a room whose walls and air are at 25 C. The surface temperature of the rod is 150 C. h=10 W/m K. The surface emissivity is: your student number/10. What is the rate of heat loss from the rod? student number =201810372 %3D