32. Calculate the heat loss per linear foot from a 10in. nominal pipe (outside diameter = 10.75in) covered witha composite pipe insulation consisting of 2.5in. of insulation I is placed next to the pipe and 3in. ofinsulation II placed upon insulation I. Assume that the inner and outer surface temperatures of thecomposite insulation are 800°F and 150°F respectively, and that the thermal conductivity of material I is0.05 BTU/hr-ft'F and for material Il is 0.039 BTU/hr-ft°F.

Given that, The inner diameter of the pipe = 10 in The outside diameter of the pipe D1 = 10.75 in…

Answered: Calculate the heat loss per linear foot…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A rubber insulated copper wire 2 mm diameter is carrying electric current and exposed to a uniform temperature of air at 40°C. What will be the maximum steady current in amperes that can be allowed if the rubber insulation is not to get heated above 45°C? Insulation thickness=1 mm Thermal conductivity of rubber= 0.15 W/m-K Air film coefficient= 10 W/m2-K Electrical resistivity of copper=10-7 ohm-m A 10.45 A В 2.1 A C) 14.5 A D 4.25 A E 9.65 A F None of these
Air at 25 ° C blows over the hot steel plate whose surface temperature is maintained at 250 ° C. The plates are 50 cm x 40 cm in dimensions and 3 cm thick. The convection heat transfer coefficient on the upper surface is 30 W / (m? ° C). The thermal conductivity of steel is 45 W / (m ° C). Calculate the hourly heat loss from the plate surface. a. heat loss per hour = kJ. b. If the reverse side surface temperature is maintained, determine the hourly heat loss incurred = kJ.
A house has a composite wall made of wood, fiberglass insulation, and gypsum boards. On a cold winter day, the external and internal heat transfer coefficients are 60 and 30 W/m²°C, respectively. The total surface area is 350 m². (a) Determine the total heat loss through the wall: (b) if the wind were blowing strongly, increasing the external coefficient to 300 W/m²°C, determine the percentage increase in heat loss; (c) what is the thermal resistance determining the total heat flow through the wall?
1. A 5.2 cm diameter spherical ball whose surface is maintained at a temperature of 71°C is suspended in the middle of a room at 23°C. If the convection heat transfer coefficient is 15 W/m2 -°C and the emissivity of the surface is 0.8, determine the total heat transfer from the ball.
Air at 25 ° C blows over the hot steel plate whose surface temperature is maintained at 200 ° C. The plates have dimensions of 50 cm x 50 cm and a thickness of 2.5 cm. The convection heat transfer coefficient on the upper surface is 25 W / (m² ° C). The thermal conductivity of steel is 45 W / (m ° C). Calculate the hourly heat loss from the plate surface. a. heat loss per hour = AnswerkJ. b. If the reverse side surface temperature is maintained, specify hourly heat loss = AnswerkJ.
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A plane wall has a thermal conductivity of 20 W/(m-K) and generates heat at 0.5 MW/m3. The wall is 0.2 meters thick and is perfectly insulated on one side. The other side is exposed to fluid at 100 °C. The convective heat transfer coefficient between the wall and the fluid is 400 W/(m2 K). Determine the maximum temperature in the wall.
The exhaust duct from a heater has an inside diameter of 114.3 mm with ceramic walls 6.4 mm thick. The average k=1.52 W/m· K. Outside this wall, an insulation or rock wool 102 mm thick is installed. The thermal conductivity of the rock wool is k= 0.046+ 1.56 x 104 T°C (W/m · K). The inside surface * = temperature of the ceramic is T1 = 588.7 K, and the outside surface temperature of the insulation is 311 K. Calculate the heat loss for 1.5 m of duct and the interface temperature T2 between the ceramic and the insulation. [Hint: The correct value of km for the insulation is that evaluated at the mean temperature of (T2 + T3)/2. Hence, for the first trial assume a mean temperature of, say, 448 K. Then calculate the heat loss and T2 Using this new T2, calculate a new mean temperature and proceed as before.]
A thick cylindrical pipe with length of 1 m and an inner diameter of 20 mm and an outer diameter of 120 mm is insulated with two layers of insulating materials. The thermal conductivity and thickness of each insulating material are as follows: Pipe k = 500 W/m-K, Insulator A = 0.10 W/m-K ; thickness = 30 mm Insulator B = 0.05 W/m-K; thickness = 30 mm Air at 200 C is flowing through the pipe. The temperature of the outer surface of the pipe is 43 C. Steady state heat transfer is occurring across radial direction. The heat transfer coefficient are as follows : h inside = 25 W/m²K and h outside = 45 W/m²K Calculate the total heat loss, the overall heat transfer coefficient, the temperature between the insulator A and B, and the temperature between the outer diameter and insulator A.
Steel pipe 5 cm thick, 1.0 m long and 8 cm deep, covered with 4 cm thick insulation. The wall temperature in the steel pipe is 100 ° C. The ambient temperature around the insulated pipe is 24 ° C. The convection heat transfer coefficient outside the insulation surface is 50 W / (m² K). The thermal conductivity of steel is 54 W / (m K), and the thermal conductivity of the insulation is 0.04 W / (m K). Count; a. Heat loss per meter of pipe = Answerwatt. b. Temperature between steel pipe and insulation. = Answer ° C.
Problem 3 A novel material is suddenly exposed on one side to a fluid material. The material has an overall thermal gradient of °C W -7,000 with a thermal conductivity of 23.8. The fluid m m.K • has a temperature of 30° C and a heat transfer coefficient of 325 W m². K. material. . Calculate the temperature at the surface of the
A: Consider a 0.8 m high and 1.5 m wide double-pane window consisting of two 4 mm-thick layers of glass (k = 0.78 W/m °C) separated by a 10 mm thick stagnant air space (k = 0.026 W/m °C). Determine the steady rate maintained of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is at 20°C while the temperature of the outdoors is 10°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m² °C and ho = 40 W/m².°C.

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