A pipe with 8 cm intemal diameter, 9 cm outer diameter, 2 meter long, thermal conductivity 30Wimk is insulated by glass wool material wilth which thermal conductivity 0,05Wimk, thickness 4 om. Intenal surface temperature of the pipe T is 80°C, surrounding temperature where ppe is located is 20°C, convection heat transfer constant on outer surface of insulation is 25wim?K. 30Wimk T.20°C h. 25Wimk a. Detemine the heat loss from the pipe to surrounding (W)? b. What is temperature of the surface between glass wooden and pipe (T2? e What is critical insulation radius for pipe? is insulation on the pipe succestul? Explain

A pipe with 8 cm intemal diameter, 9 cm outer diameter, 2 meter long, thermal conductivity 30Wimk is insulated by glass wool material wilth which thermal conductivity 0,05Wimk, thickness 4 om. Intenal surface temperature of the pipe T is 80°C, surrounding temperature where ppe is located is 20°C, convection heat transfer constant on outer surface of insulation is 25wim?K. 30Wimk T.20°C h. 25Wimk a. Detemine the heat loss from the pipe to surrounding (W)? b. What is temperature of the surface between glass wooden and pipe (T2? e What is critical insulation radius for pipe? is insulation on the pipe succestul? Explain

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...

See similar textbooks

Similar questions

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.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
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.
A square silicon chip 7mm7mm in size and 0.5-mm thick is mounted on a plastic substrate as shown in the sketch below. The top surface of the chip is cooled by a synthetic liquid flowing over it. Electronic circuits on the bottom of the chip generate heat at a rate of 5 W that must be transferred through the chip. Estimate the steady-state temperature difference between the front and back surfaces of the chip. The thermal conductivity of silicon is 150 W/m K. Problem 1.6
Choose the false statement? We can express lumped capacitance relation as the combination of Biot and Fourier numbers At very low values of Prandtl number, material has higher thermal conductivity compared to its momentum diffusivity We can calculate convective heat transfer coefficient from Nusselt number If Biot number is less than 0.1, we can neglect thermal resistance in some direction None of the given
A pipe with 8 cm internal diameter, 9 cm outer diameter, 2 meter long, thermal conductivity 30W/mK is insulated by glass wool material with which thermal conductivity 0,05W/mK, thickness 4 cm. Internal surface temperature of the pipe T1 is 80°C, surrounding temperature where pipe is located is 20°C, convection heat transfer constant on outer surface of insulation is 25W/m?K. K 30WimK T. 20°C h. = 25W/MK 4cm 0,05W/mK a. Detemine the heat loss from the pipe to surrounding (W)? b. What is temperature of the surface between glass wooden and pipe (T2)? c. What is critical insulation radius for pipe? Is insulation on the pipe succesful? Explain
H.W.5 A wall having a thickness of (4cm) has an internal heat generation of (280MW/m') and a thermal conductivity of (15 W/m.C). One side of the plate is insulated and the other side exposed to air at (30C) and heat transfer coefficient of (10W/m².C). Start from the principle to determine the maximum temperature in the plate and draw the temperature profile inside the wall.
one piece DU - Moodle English (en) - ESLIon -t yet swered The temperature distribution through a furnace wall consisting of firebrick and high-temperature block insulation and steel plate is measured as shown in the figure below. The thermal conductivity of fire brick is 1.13 W/(m. K). Find the heat loss per unit area of the furnace wall. rked out of 2 3 4 5 Flag question 760°C 758°C Block insulation 727°C | Outside air Hot gasef 68.42°C 26.5°C 68.5°C 6.35cm 12.7cm 0.635cm Select one: O a. 5.50 W/m2 O b. 550 W/m? O c. 55.0 W/m2 O d. 40 W/m2 Fire bri ck Steel casting
A pipe with 8 cm internal diameter, 9 cm outer diameter, 2 meter long, thermal conductivity 30Wimk is insulated by glass wool material with which themal conductivity 0,05W/mk, thickness 4 cm. Internal surface temperature of the pipe T, is 80 C, surrounding temperature where pipe is located is 20°C, convection heat transfer constant on outer surface of insulation is 25Wim2K. 30W/mk T.= 20"C h. - 25WimK 4cm 0,05Wimk a. Detemine the heat loss from the pipe to surrounding (Wy? b. What is temperature af the surface between glass wooden and pipe (T2)? e What is critical insulation radius for pipe? is insulation on the pipe succesful? Explain
Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 100 Wm? C. The convection coefficient on the outside is 10 W/n C. The pipe is covered with a layer of asbestos. 1-determine the thickness of the asbestos layer at the critical insulation radius of the pipe. 2-calculate the change percent of heat transfer with and without the insulation. 3-commet on your results,
h = 11 W/m R (Uutslut Consider steady-state heat conduction through a cylindrical wall T The fluid on the inside. at 590 K with a heat transfer coefficiect of 23 W/m“ K. The temperature on the outsida surface of the wall is known and maintained at 420 K. The heat flow rate through the cylind-ie. Wall is 200 W per 1 m length of the cylinder. If the wall has a thermal conductivity of 0.17 K. what are the inside and outside radii of the cylindrical wall? The ratio of the outside radiue inside radius is 2. Calculate the net heat flow by radiation to the fumace all at 530 K from the fumace (3) floor at 810 K. Both surfaces can be considered to be black radiators. ::!...: AT 1 1.... 3.7 の- Ta-
For the composite wall shown, calculate T,. Assume 1-D steady conduction and neglect thermal contact resistance. = 0.25 cm = 0.75 cm AISI 302 stainless steel рyrex glass fluid 1 fluid 2 = 100°C T2 = 10°C h, = 50 W/m²-K h, = 20 W/m2.K T T3