Example: Multilayer cylindrical thermal resistance network Steam at T= 320 °C flows in a cast iron pipe [k = 80 W/ m.°C] whose inner and outer diameter are D, = 5 cm and D, = 5.5 cm, respectively. The pipe is covered with a 3 cm thick glass wool insulation [k = 0.05 W/ m.°C]. Heat is lost to the surroundings at T, radiation, with a combined heat transfer coefficient of h, = 18 W/m2. °C. Taking the heat transfer coefficient inside the pipe to be h, = 60 W/m2 K, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drop across the pipe shell and the insulation. Assumptions: Steady state and one dimensional heat transfer. Solution: Taking L = 1 m, the areas of the surfaces exposed to convection are: %3D = 5°C by natural convection and %3D %3D %3D

Example: Multilayer cylindrical thermal resistance network Steam at T= 320 °C flows in a cast iron pipe [k = 80 W/ m.°C] whose inner and outer diameter are D, = 5 cm and D, = 5.5 cm, respectively. The pipe is covered with a 3 cm thick glass wool insulation [k = 0.05 W/ m.°C]. Heat is lost to the surroundings at T, radiation, with a combined heat transfer coefficient of h, = 18 W/m2. °C. Taking the heat transfer coefficient inside the pipe to be h, = 60 W/m2 K, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drop across the pipe shell and the insulation. Assumptions: Steady state and one dimensional heat transfer. Solution: Taking L = 1 m, the areas of the surfaces exposed to convection are: %3D = 5°C by natural convection and %3D %3D %3D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A// For laminar flow over a flat plate, the local heat transfer coefficient h, is known to -1/5 vary as x where x is the distance from the leading edge (x =0) of the plate. What is 3 the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? for velocity equation u 2-0.43x+x² Plot the local heat transfer coefficient over a 0.8 cm length(take T-35c)
Problems: Q1/ The inner and outer surfaces of a 5-m 6-m brick wall of thickness 30 cm and thermal conductivity 0.69 W/m °C are maintained at temperatures of 20°C and 5°C, respectively. Determine the rate of heat transfer through the wall, in W. Answer: 1035 W Brick wall 20°C 5°C 30 cm
-The wall composed of a three oven has materials, two of which withthermal conductivity, kA = 20 W / (m · K) and kC = 50 W / (m · K), and thickness LA = 0.30 m and LC = 0.15 m tagged. The third material, B, which is found among the materials A and C, has a known thickness LB = 0.15 m, but its thermal conductivity kB is unknown. Under steady-state operating conditions, measurements reveala temperature at the outer surface of the oven of Ts, e = 20 °C, a temperature at inner surface of Ts, i = 600 °C and an air temperature inside the oven of T∞ = 800 ° C. The internal convective coefficient h is known, being equal to 25 W/(m²K). What is the value of kB?
An aluminum pipe has a length of 64 m at a temperature of 15°C. An adjacent steel pipe at the same temperature is 2 mm longer. At what temperature will the aluminum pipe be 6 mm longer than the steel pipe? Assume that the coefficient of thermal expansion for the aluminum is 22.5x10-6/°C and that the coefficient of thermal expansion for the steel is 12.5x10-6/°C. Answer: T₁= i °℃
Note: Don't copy from other experts solution. Carefull with given values and thermal coefficient values in Celsius.
2) Three materials are connected as the following figure. The heat conductivity coefficient of material A is greater than B and the coefficient of material B is greater than C. Initially the system is at high temperature and then cooled down by convection from the right side. Approximately sketch the steady-state temperature profile in the system. Pay attention that the left wall is insulated. B C
An aluminum pipe has a length of 52 m at a temperature of 6°C. An adjacent steel pipe at the same temperature is 8 mm longer. At what temperature will the aluminum pipe be 24 mm longer than the steel pipe? Assume that the coefficient of thermal expansion for the aluminum is 22.5x10-6/°C and that the coefficient of thermal expansion for the steel is 12.5×106/°C. Answer: °℃ Tf= i
In horizontal pipe, which of the following is constant? Pressure headElevation headVelovity head 12
No. 1. (10 Pts) An aluminum pipe with a length of 60 m at a temperature of 10°C rests freely on the ground. An adjacent steel pipe at the same temperature is 5 mm longer than the aluminum pipe. (a) At what temperature (degrees Celsius) will the aluminum pipe be 15 mm longer than the steel pipe? (Assume that the coefficients of thermal expansion of aluminum and steel are aa=23x10-6/"C and as=12x10-6/ c, respectively.) (b) What is the axial stress developed in the aluminum pipe when the temperature was increased? 5 mm Aluminun Steel Figure No. 1
A steel crane rail tracks laid with their adjacent ends 5mm apart. In the spring when the temperature is 20 Degrees Celcius, the length of each rail is 20. The coefficient of thermal expansion is 1.20E-5/Degress Celcius and the Young's Modulus is 201590MPa. a) Determine the temperature in celcius at which the rails will touch end to endb)Determine the gap between the adjacent ends during winter when the temperture is at 5 Celciusc) Determine the compressive stress in the rails when the temperature is at 40 Celcius
A parallel-plate air-filled capactor has a capacitance of 50 pF and each of its plates has an area of 0.35 m2. If the region between the plates is filled with material having K = 5.6, what is the capacitance? 195 pF 280 pF 260 pF
7. A cylindrical tank holds a liquid with a mass density of 1200 kg/m³. In the region above the fluid, the tank also contains an inert gas that is pressurized to 0.08 MPa. What is the required wall thickness of the tank if the strength of the tank wall material is 200 MPa in tension? Use a safety factor of 2.5. Assume the restraining effect of the tank base can be neglected. gas liquid 2.6m 4m