HEAT TRANSFER A thick-walled tube of stainless steel of 19 W/m°C with 2 cm inner diameter (ID) and 4cm outer diameter (OD) is covered with a 3 cm layer of asbestos insulation (k=0.2 W/m°C) if the inside wall temperature of the pipe is maintained at 600°C, calculate the heat loss per meter of length, and the tube-insulation interface temperature. Stainless steel T1= 600 °C / Asbestos T2= 100 °C. SHOW COMPLETE SOLUTION IN A PAPER

HEAT TRANSFER A thick-walled tube of stainless steel of 19 W/m°C with 2 cm inner diameter (ID) and 4cm outer diameter (OD) is covered with a 3 cm layer of asbestos insulation (k=0.2 W/m°C) if the inside wall temperature of the pipe is maintained at 600°C, calculate the heat loss per meter of length, and the tube-insulation interface temperature. Stainless steel T1= 600 °C / Asbestos T2= 100 °C. SHOW COMPLETE SOLUTION IN A PAPER

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.10P: 3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the...

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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.
Estimate the rate of heat loss per unit length from a 5-cm ID, 6-cm OD steel pipe covered with high-temperature insulation having a thermal conductivity of 0.11 W/(m K) and a thickness of 1.2 cm. Steam flows in the pipe. It has a quality of 99% and is at 150C. The unit thermal resistance at the inner wall is 0.0026(m2K)/W the heat transfer coefficient at the outer surface is 17W/(m2K) and the ambient temperature is 16C.
An electronic device that internally generates 600 mW of heat has a maximum permissible operating temperature of 70C. It is to be cooled in 25C air by attaching aluminum fins with a total surface area of 12cm2. The convection heat transfer coefficient between the fins and the air is 20W/m2K. Estimate the operating temperature when the fins are attached in such a way that (a) there is a contact resistance of approximately 50 K/W between the surface of the device and the fin array and (b) there is no contact resistance (in this case, the construction of the device is more expensive). Comment on the design options.
(1) Steel tube with a thermal conductivity 50 WI(m-K), the outer diameter of 108 mm and the wall thickness of 5 mm, is covered with the three layer of insulation with a thickness of: 25 mm/ A, = 0,038 WI(m-K) 35 mm/ = 0,052 WI(m-K) 4 mm /Ag = 0,12 WI(m-K) The inner temperature of tube wall is twi=218°C and the outside surface of the second insulating layer tws = 76°C. Calculate the all unknown temperature on the contact layers and on the outside surface of the insulation.
i. A very long rod 5 mm in diameter has one end maintained at 100 oC. The surface of the rod is exposed to ambient air at 25 oC with convection heat transfer coefficient of 100 W/m2-K and thermal conductivity is 180 W/m-K. Determine the temperature distribution along the rod and What is the heat loss. ii. Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 500 W/m2◦C. The convection coefficient on the outside is 12 W/m2 ◦C. Calculate the overall heat-transfer coefficient.
1. Saturated steam at 500 K flows in a 0.20 m inside diameter, 0.21 m outside diameter pipe. The pipe is covered with 0.075 m of insulation with a thermal conductivity of 0.10 W/m-K. The pipe's conductivity is 52 W/m-K. The ambient temperature is 300 K. The unit convective coefficients are hi = 18,000 W/m²-K and ho 12 W/m²-K. Determine the heat loss (kJ/min) from 5 m of pipe.
3. Hot water flows inside a 2.5 cm inner diameter tube, the tube has a wall thickness of 0.8 mm (tube length=1m) with a conduction resistance of 0.000183 °C /W, the inner and outer convection resistance are (0.00662, 1.196 °C /W) respectively. The overall heat transfer coefficients depending on the outer diameter of the pipe is equal to: A. 9.94 W/m2 °C B. 200 W/m² °C C. 0.5 W/m² °C D. None of them
One vessel having a carbon-steel wall of thickness 5 mm carrying saturated steam and water at 423K. The vessel is insulated with magnesia of thickness 50 mm. If the ambient air temperature is 321 K, determine the heat loss from the vessel. Given: i. thermal conductivity of carbon steel is 52 W/m.K ii. thermal conductivity of magnesia is 0.5 W/m.K iii. surface coefficient of insulation surface is 3 W/m2.K
Consider two aluminum (k=180 W/mK) pin-fin heat sinks with 1 mm and 2 mm square pins both 25 mm long. Assume that the gap between the pins = side of the pin, ie the one mm pin-fin heat sink has 1 mm gap between its pins. Assuming the module base is 50 mm x 50 mm and the heat sink cannot overhang due to lack of space, and h = 40 W/m?K with jet impingement, calculate: (a) Cooling surface area ratio (1 mm heat sink/ 2 mm heat sink) (b) Heat transfer ratio (1 mm heat sink/2 mm heat sink) Try to fit the maximum number of pins on the 50 mm x 50 mm base.
A steel pipe (k = 16W/m.K) of D; =2-mm inner diameter and t =4-mm in thickness is covered with t2 =6-mm thick of fiber glass insulation ( k = 0.05 W/m.K). If the inside and outside convective heat transfer coefficients areh; =8 W/m2 Kand h, =4 W/m²K, find the eguivalent resistance for the unit lenght of the pipe.
HEAT TRANSFER: A thick-walled nuclear coolant pipe (k = 12.5 Btu/hr-ft-°F) with 10 in. inside diameter and 12 in. outside diameter is covered with a 3 in. layer of asbestos insulation (k 0.14 = Btu/hr-ft-°F). If the inside wall temperature of the pipe is maintained at 550°F, (a) calculate the heat loss per foot of length. The outside temperature is 100°F. (b) Find the interface temperature between the pipe and the insulation.
You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?