Two large plates are maintained at a temperature of 910 K and 500 K respectively. Each plate has area of 100cm^2. Compare the net heat exchange between the plates for the following cases. a. Both plates are black b. Plates have an emissivity of 0.5

Two large plates are maintained at a temperature of 910 K and 500 K respectively. Each plate has area of 100cm^2. Compare the net heat exchange between the plates for the following cases. a. Both plates are black b. Plates have an emissivity of 0.5

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

An exactly same problem is already solved on bartl*by.Take reference from there.
Two parallel Aluminum sheet plates 0.75 by 1.0 m are spaced 0.4 m apart. One plate is maintained at 1200-C and the other at 300-C. What is the net radiant heat exchange between the two plates?
heat transfer
An astronaut performing an extra-vehicular activity(space walk) shaded from the Sun is wearing a spacesuitthat can be approximated as perfectly white (e = 0) exceptfor a 5 cm × 8 cm patch in the form of the astronaut’snational flag. The patch has emissivity 0.300. The spacesuitunder the patch is 0.500 cm thick, with a thermalconductivity k = 0.0600 W/m °C , and its inner surface isat a temperature of 20.0 °C . What is the temperature of thepatch, and what is the rate of heat loss through it? Assumethe patch is so thin that its outer surface is at the sametemperature as the outer surface of the spacesuit under it.Also assume the temperature of outer space is 0 K. You willget an equation that is very hard to solve in closed form,so you can solve it numerically with a graphing calculator,with software, or even by trial and error with a calculator.
2. Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 295 K and T2 = 155 K that are L = 2 cm apart. Assuming the surfaces to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air,(k = 0.01979 W/m- o C) (b) evacuated,(c) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m · °C.
Explain why convection happens more often in gases and liquids than solids.
10-cm-diameter hemisphere in Figure Example 8-8 is maintained at a constant temperature soo°C and insulated on its back side. The surface emissivity is 0.4. The opening exchanges adiant energy with a large enclosure at 30°C. Calculate the net radiant exchange
Two surfaces make up an enclosure where surface 1 is flat and has area A1,temperature T1 and emissivity 1. Surface 2 is black and has temperature T2. Showthat the net power transfer rate (net heat flux) in W/m2 at surface 1 is given by
A particular furnace is shaped like a section of a cone. The top surface of the furnace is uniformly heated by a resistance heater. During operation, the top surface is measured to be 800 K and the power supplied to the resistance heater is 1750 W/m². The sidewall of the furnace is perfectly insulated with & = 0.2. If the emissivity of the top and bottom surfaces are ε = 0.5 and ε = 0.7, respectively, determine the temperatures of the sidewall and the bottom surface of the furnace. A₁ A2 A3 →→D₂ = 20 mm D₁ = 40 mm L = 50 mm
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T. exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m²-K, and the absorptivity of the temperature is T, = 30°C. Assume the exposed wall surface is gray, and the surroundings are large. gbonv i W/m? Tad i W/m2
Determine the heat flow between the roof and floor of 4 x 3 m size of a furnace of 4 m x 4 m x 3 m size when the roof is at 1200 K and the floor is maintained at 600 K, with the other surfaces non absorbing and reradiating. The surface emissivity of the hotter surface is 0.8 and that of the cooler surface 0.6.