Question

A pipe is transporting saturated steam at 1 bar (100°C) . The pipe has an inside...

A pipe is transporting saturated steam at 1 bar (100°C) . The pipe has an inside diameter of 100 mm with a 9 mm thick wall. The pipe is mild steel with a thermal conductivity of 80 W m-1 K-1. Covering the pipe is a 20 mm thick layer of polythene insulation with a thermal conductivity of 0.04 W m-1 K-1. The convective heat transfer coefficient of the steam is 513.4 W m-2 K-1. The convective heat transfer coefficient of the air around the insulated pipe is 22.9 W m-2 K-1 which is at 22°C. Calculate the heat lose per unit area (1 m) of the insulated pipe in watts (W) (1 DP). Neglect radiation heat transfer.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Summary: Heat loss per unit area = 142.93 W

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and...
Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and outer radii of the pipe are r1 = 4 cm and r2 = 4.5 cm, respectively, and the outer surface of the pipe is insulated with a layer of 50 mm thick-calcium silicate of thermal conductivity of k = 0.5 W/m.K, and is maintained at 350 °C. If the convection heat transfer coefficient on the inner surface of the pipe is h = 65...
A 2.5 cm inside diameter pipe is being used to convey a liquid food at 80ºC....
A 2.5 cm inside diameter pipe is being used to convey a liquid food at 80ºC. The inside convective heat transfer coefficient is 10W/(m2ºC). The pipe (0.5 cm thick) is made of steel (thermal conductivity = 43W/mºC). The outside ambient temperature is 20ºC. The outside convective heat-transfer coefficient is 100 /(m2ºC). Calculate the overall heat transfer coefficient and the heat loss from 1 m length of the pipe.
Steam at 350°F flows through a 3-in (ID) copper pipe having a thickness of 0.22 in....
Steam at 350°F flows through a 3-in (ID) copper pipe having a thickness of 0.22 in. The outside surface of the pipe is insulated with 1-in-thick layer of fiberglass and 0.008-in-thick layer of aluminum. The outside surface of the insulation is exposed to air at 130°F. The convection coefficients for steam and air are 25 and 12 Btu/h-ft2 -°F, respectively. The thermal conductivity of fiberglass is 0.022 Btu/h-ft-°F. a. Calculate the rate of heat transfer for 30-ft length of the...
Liquid, pumped through the inside of the pipe, is at a temperature Ti = 400K and...
Liquid, pumped through the inside of the pipe, is at a temperature Ti = 400K and provides a convection coefficient hi = 450 W/m2-K at the inner surface of the pipe. The inside and outside radii of the pipe are r1 = 0.25 m, r2 = 0.31 m. The thermal conductivity of the pipe is 240 W/m-K. The outside radius of the insulation, r3 = 0.35 m. The thermal conductivity of the insulation is 20 W/m-K. The outside surface is...
Uniform area, heat transfer problem A stove's walls are made up of a flat inner insulating...
Uniform area, heat transfer problem A stove's walls are made up of a flat inner insulating board 0.01m thick (thermal conductivity: 0.2 W m-1K-1) and a flat outer steel sheet 0.01m thick (thermal conductivity: 26 W m-1K-1). A mineral-wool (thermal conductivity: 0.065 W m-1K-1) is placed between these sheets. The inside temperature of the wall is 773K, how thick does the insulation have to be to maintain the outside wall temperature at 323K ? Assume that the ambient air temperature...
Insulation of steam pipes is an important aspect in industries to resist the heat loss from...
Insulation of steam pipes is an important aspect in industries to resist the heat loss from the steam pipe to the surrounding. In a typical steam pipe in an industry is made of steel( k=58w/mk) has inner diameter of 160mm and outside diameter of 170 mm. The saturated steam from a boiler flowing through the steam pipe is at 300C while the ambient air is at 50 C. The steel pipe has two layers of insulation the inner layer(k=0.17w/mc) is...
hot fluid at 230°C flows through a 1-meter pipe of 0.02m outside radius and 0.015m inside...
hot fluid at 230°C flows through a 1-meter pipe of 0.02m outside radius and 0.015m inside radius. The thermal conductivity of the pipe is 0.5 W/m.k, and the heat transfer coefficient (hi) inside is 300 W/m2 K. The pipe is located in a room at 30°C, and the heat transfer coefficient (ho) at the outer surface is 10 W/m2 k. Calculate the temperature drop (∆T) across the pipe wall.
A thin metallic wall may be constructed using copper (properties are given in the table). The...
A thin metallic wall may be constructed using copper (properties are given in the table). The piping is required to have a radius r = 0.008 m and carries steam at 385 K. The wall is inside a room surrounded by air at a temperature of 298 K. The wall is insulated with a material (properties are given in the table). Properties Copper Insulation material Thermal Conductivity (W/m per ˚C) 385 0.071 Density (kg/m3) 8940 453 i. If the external...
Saturated steam at 1 atm condenses on the outer surface of a vertical, 100-mm-diameter pipe 1...
Saturated steam at 1 atm condenses on the outer surface of a vertical, 100-mm-diameter pipe 1 m long, having a uniform surface temperature of 94 o C. Estimate the heat transfer rate to the pipe and the total condensation rate.
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1 , 20 mm thick), fibreglass insulation (k = 0.045 W m-1 K -1 , 70 mm thick) and plasterboard (interior) (k = 0.25 W m-1 K -1 , 10 mm thick). Determine the total heat loss through the wall when the inside temperature is 20 °C, the outside temperature is -10 °C, the inside heat transfer coefficient is 15 W m-2 K -1 ,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT