QUESTION 6 A long 6-cm-diameter steam pipe whose external surface temperature is 90°C passes through some...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
(c) Steam flows a pipe of external diameter 30 mm, where the pipe outer surface temperature is 130oC. Circular annular fins (k = 180 W·m-1·K-1) of outer diameter 60 mm and thickness 1 mm are fitted tightly to the pipe. Heat is transferred by convection (h=10 W·m-2·K-1) to the surrounding air at 20oC. (i) Determine the efficiency of a single fin. (ii) Determine the heat transfer rate for a single fin. (8 marks) (6 marks) (iii) Determine the effectiveness of...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature of the wire is T.-11.0°C during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 40 km/h, which is the heat loses in one kilometer of transmission line. Air properties: p= 1.246 kg/m”, k = 0.02439 W/m. C, u=1.426x10* mºis, Pr = 0.7336 Wind, 40 km/h 100/14 Transmission lines
A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 125-mm diameter has an emissivity of 0.85 and an outer surface temperature of 373 K. Calculate the rate of heat loss per unit length from the pipe. The answer should be close to 45.2 W/m Please show all work clearly
3. CIN: A 50 m long section of a steam pipe at 15°C. The average temperature of the outer surface of combined heat transfer coefficient or the rate of heat loss from the steam plp generated in an natural gas furnance $0.52/therm (1 therm = 105, 0.035 W/mK) needed in order to say remain constant at 150°C. (10 marks) For a steam pipe whose outer diameter is 10 cm passes through an open space mperature of the outer surface of...
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is exposed to the cross flow of air at 5°C with the velocity of 25 km/h. The surface of the pipe is maintained at 75°C and its emissivity is estimated to be 0.8. The surrounding temperature is at 0°C. Determined the total heat loss from the pipe.
HELP MEEE An uninsulated steam pipe passes through a room where the temperatures of the air and its walls are 38 degrees. The outer diameter of the pipe is 90 mm, the temperature and spreading rate of its surface are 200 degrees and 0.8, respectively. Calculate the radiating power of the surface and the radiation to the surface. Since the heat transfer coefficient with natural convection from the surface to the air is 25 w/m^2.K, what is the heat loss...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperature is 20 C. Convective heat transfer of stem to the pipe is very high. Emissivity of the pipe is estimated at 0.8.Calculate the rate of heat transfer from the pipe. State any assumptions. Problem 2 (10/30) - Steam at 180 C...
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of 16 W m-1 K -1 whose inner and outer diameters are 5 and 6 cm respectively. The pipe is covered with 3 cm think insulation having a thermal conductivity of 0.035 W m-1 K -1 . The combined convection and radiation heat transfer coefficient at the outside surface of the insulation is 20 W m-2 K -1 and the surroundings are at 10 °C....