مشر on ۲/۱ Two rods (fins) having same dimensions, one made of brass(k=85 m K) and the other of copper (k = 375 W/m K), having one of their ends inserted into a furnace. At a section 10.5 cm a way from the furnace, the temperature brass rod 120°C. Find the distance at which the same temperature would be reached in the copper rod ? both ends are exposed to the same environment. 22.05 ofthe

مشر on ۲/۱ Two rods (fins) having same dimensions, one made of brass(k=85 m K) and the other of copper (k = 375 W/m K), having one of their ends inserted into a furnace. At a section 10.5 cm a way from the furnace, the temperature brass rod 120°C. Find the distance at which the same temperature would be reached in the copper rod ? both ends are exposed to the same environment. 22.05 ofthe

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.40P: As a designer working for a major electric appliance manufacturer, you are required to estimate the...

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The temperatures of each node are shown in the figure and all values are given. Find the heat loss from the top surface of the plate to the environment. h=12 W/(mC) T₁₂ = 18°C 60.00°C 21.15°C 23.39°C 38.52°C Axy-0.05 m 60.00°C 95.11 178.70°C 364.13 c -0.02 W/m˚C) 60.00°C 120.60 C 232.6°C 450.55" q=122 W/m² Lütfen birini seçin: O a. 21.55 W O b. 22.32 W O c. 30.33 W O d. 38.40 W c. 23.88 W
A wall of a house is made from two layers of bricks enclosing a layer of insulation. A radiator is positioned to cover the whole internal surface, and used intermittently when the internal temperature is low. The external surface is exposed to the outside air. Which of the following assumptions could be used to identify the relevant reduced form of the conduction equation to find the temperature in the wall. a. Conduction is mainly in two directions. b. Conduction is mainly in one direction. c. The wall properties are homogeneous. d. Steady conditions exist. e. Unsteady conditions exist. f. There is an internal volumetric heat generation in the wall.
Consider a plate whose thickness is 2L=20 cm and thermal conductivity is 44 W/mK. Heat generation inside the plate (5x105 W/m³) is uniform. The surface of the plate is maintained at Ts=10°C. Find the temperature at the center of plate. T Ts -L L X O a. 45 °C ОБ.75 °С О с. 67 оС O d. 90 °C O e. 85 °C
A metal rod 1 sq. in. in cross section and 6 in. long is heated at one end and cooled at the other. If the rate of heat input is 3 BTu/hr and the difference in temperature of the two ends is 2 deg. F, what is the coefficient of thermal conductivity in BTU/(hr)(ft²)(⁰F/ft)?
The first part of the question has been worked on, where the heat transfer was calculated to be 6.770 kilowatt, but the problem also asks to calculate the temperature of the outer most surface. What is the temperature of the outer most surface?
question A B and C
Exercise question 1
Please help me with these questions An element on a hot stove is maintained at a constant temperature of Thot = 105 °C and a pan is placed on the element. The base of the pan can be taken to be a uniform circular layer of diameter 15 cm and thickness 7.0 mm, and with a thermal conductivity of 15 W m-1 K-1. a. The air above the pan comes into thermal equilibrium with the element. Write down the temperatures on the top and bottom surfaces of the pan and the rate of heat flow through the pan. Use the zeroth law of thermodynamics to explain your answer. A fan is then switched on so that the air above the pan is maintained at Tcold = 20 °C, and the system reaches a steady state. b. Identify the heat transfer mechanism that is being used to maintain the air at Tcold. c. Calculate the rate of heat transfer through the pan. A 3.0 mm thick layer of soup is added to the pan and the system again reaches a steady state. The temperature at the boundary between the pan and the soup is 95 °C. d.…
Answer within 10 minutes : The temperature at the inside surface of an oven is 460 oF. The inside wall of the oven is made of brick and is 8 inch thick. The thermal conductivity of the brick is 2.2 Btu/hr.ft2.(oF/ft). The outside of the oven is covered with a 3-inch layer of asbestos as insulation, which has a thermal conductivity of 0.11 Btu/hr.ft2.(oF/ft). If the outer surface of the insulation has a temperature of 100 oF , calculate the amount of heat lost through 2 ft2 of wall area in 3 hours.
11. CD mmh A composite rod is made from stainless steel and iron and has a length of 0.50 m. The cross section of this composite rod is shown in the drawing and consists of a square within a circle. The square cross section of the steel is 1.0 cm on a side. The temperature at one end of the rod is 78 °C, while it is 18 °C at the other end. Assuming that no heat exits through the cylin- drical outer surface, find the total amount of heat Iron Stainless steel conducted through the rod in two minutes.
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