Estimate the heat loss per unit length of the pipe

Assignment Help Mechanical Engineering

Reference no: EM13710448

Saturated steam at 120oC is transported through a steel pipe of diameter 250 mm. The temperature of the outer surface of the pipe can also be assumed 120^oC. The pipe is centeredin concrete of square cross section (400x400 mm). The outer surfaces of the concrete are exposed to ambient air, for which T? = 20^oC and h = 25 W/(m2*K). Radiation heat exchange can be neglected.

a. Estimate the heat loss per unit length of the pipe.

b. Plot the quality of steam exiting a 100-m long pipe as a function of steam flow rate. The steam quality at the entrance is 100%. The quality of a wet steam is defined as the mass fraction of the mixture that is vapor.

c. If the quality of steam flowing through this 100-m long pipe is not to fall below 80%, estimate the minimum allowable flow rate of the steam.

Data: k concrete = 1.3 W/(m*K), heat of condensation = 2202.59kJ/kg.

Reference no: EM13710448

Questions Cloud

What is their equivalent capacitance : Three capacitors of 2.0, 9.0, and 17.0 µF are joined together in parallel. What is their equivalent capacitance

Find the allowed wave functions and corresponding energies : A particle is moving in a simple harmonic oscillator potential V(x) = (1/2)kx2, Calculate the allowed wave functions and corresponding energies

What is the rate of energy change of the cylinder : A 1m-long metal cylinder of 25cm radius is heated such that the axial temperature distribution at a certain instant of time is T(z)=a+bz+cz2 where a=900K, b=-500K/m and c=150K/m2 . What is the rate of energy change of the cylinder at this instant if ..

What is the acceleration of the frisbee : The horizontal coordinates of a Frisbee in a strong wind are given by x = -12 t +4t2 and y = 10 t -3t2 where x and y are in meters, and t is in seconds. What is the acceleration of the Frisbee

Estimate the heat loss per unit length of the pipe : Saturated steam at 120oC is transported through a steel pipe of diameter 250 mm. The temperature of the outer surface of the pipe can also be assumed 120oC. The pipe is centeredin concrete of square cross section (400x400 mm). The outer surfaces of t..

What horizontal pushing force is required to slide : A 53.0-kg crate rests on a level floor at a shipping dock. What horizontal pushing force is required to slide the crate across the dock at a constant speed

How long will it take for the current in the circuit : An unchanged 8.80- µF capacitor is in series, through a switch, with a 4.90-Mohm resistor and a 16.0- V battery (with negligible internal resistance.) How long will it take for the current in the circuit to drop to 0.37Ii

What is its acceleration : Suppose an object changes it velocity from v = (30i + 4j) m/s to v = (-4i + 30j) m/s in 5 seconds. What is its acceleration

What is the spring constant : A 75 kg rock sits quietly on a spring, having displaced the end of the spring by 0.15 m. What is the spring constant

User Account

All Pages