Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and an outer diameter of D2 = 32 mm. The thermal conductivity of the pipe wall is 12 W/m·K. The inner surface of the pipe is coated with thin polyvinylidene chloride (PVDC) lining. Along a length of 1 m, the pipe outer surface is exposed to convection heat transfer with hot gas, at T∞ = 100°C and h = 5 W/m2·K, and thermal radiation with a surrounding at Tsurr = 100°C. The emissivity at the pipe outer surface is 0.3. The liquid flowing inside the pipe has a convection heat transfer coefficient of 50 W/m2·K. If the outer surface of the pipe is at 85°C, determine the temperature at the PVDC lining and the temperature of the liquid. The ASME Code for Process Piping (ASME B31.3-2014, A323) recommends a maximum temperature for PVDC lining to be 79°C. Does the PVDC lining comply with the recommendation of the code?
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Liquid flows in a metal pipe with an inner diameter of
D1 = 22 mm and...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and outer diameter of the pipe are 8 cm and 6 cm respectively with pipe length of 20-m. The thickness of gypsum plaster which wraps the pipe is 4 cm. The heat transfer coefficient of the inner pipe and outer insulation are 800 W/m2.°C and 200 W/m2.°C with inner pipe temperature of 200°C and outer insulator temperature of 10°C. The thermal conductivity of the pipe...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by s...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by saturated steam with pressure p 172 bar and convection coefficient h 6000 carries water with mean velocity u- (a) Determine the convective heat transfer coefficient inside the pipe for water at mean temperature Tm 37° C (b) At this same location, determine the total thermal resistance (per unit length) between the water and the steam. (c) Determine the heat transfer rate (per...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
Consider a pipe of length L with an inner radius r1 and outer radius r2. The...
Consider a pipe of length L with an inner radius r1 and outer radius r2. The outer surface is thermally insulated while the inner surface is at temperature T1. The thermal conductivity of the wall is k constant. Heat is generated in the wall of the pipe with a volumetric uniform heat generation g (W/m3 ). Assume steady and one dimensional heat transfer (b) Determine the temperature variation in the wall of the pipe and the heat flux on...
6. A pure copper pipe with inner diameter Di = 12 mm and outer diameter Do-15...
6. A pure copper pipe with inner diameter Di = 12 mm and outer diameter Do-15 mm is surrounded by saturated steam with pressure p 08 bar and convection coefficient h,-7000R. The pipe carries water with a convection coefficient h _ 5000 m2 R. Determine the steam condensation rate (per unit length) around the pipe at the location where the mean water temperature reaches 95°C.
A steam main of 150 mm outside diameter containing wet steam at 28 bar is insulated...
A steam main of 150 mm outside diameter containing wet steam at 28 bar is insulated with an inner layer of diatomaceous earth, 40 mm thick, and an outer layer of 85 % magnesia, 25 mm thick. The inside surface of the pipe is at the steam temperature, and the heat transfer coefficient for the outside surface of the lagging is 17 W/m2 K. The thermal conductivities of diatomaceous earth and 85 % magnesia are 0.09, and 0.06 40 ME...
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...
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...
(c) Steam flows a pipe of external diameter 30 mm, where the pipe outer surface temperature...
(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 long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and outer diameter of the pipe are 8 cm and 6 cm respectively with pipe length of 20-m. The thickness of gypsum plaster which wraps the pipe is 4 cm. The heat transfer coefficient of the inner pipe and outer insulation are 800 W/m2.°C and 200 W/m2.°C with inner pipe temperature of 200°C and outer insulator temperature of 10°C. The thermal conductivity of the pipe...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by saturated steam with pressure p 172 bar and convection coefficient h 6000 carries water with mean velocity u- (a) Determine the convective heat transfer coefficient inside the pipe for water at mean temperature Tm 37° C (b) At this same location, determine the total thermal resistance (per unit length) between the water and the steam. (c) Determine the heat transfer rate (per...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
6. A pure copper pipe with inner diameter Di = 12 mm and outer diameter Do-15 mm is surrounded by saturated steam with pressure p 08 bar and convection coefficient h,-7000R. The pipe carries water with a convection coefficient h _ 5000 m2 R. Determine the steam condensation rate (per unit length) around the pipe at the location where the mean water temperature reaches 95°C.
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...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
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