Consider a 0.6-m-high and 1.2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k=0.78 W/m-K) separated by a 8-mm-wide stagnant air space (k = 0.025 W/m K). Determine the steady rate ofheat transfer (in W) through this double-pane window for a day during which the room is maintained at 20°Cwhile the temperature of the outdoors is - 5°C. Take the convection heat transfer coefficients on the inner andouter surfaces of the window to be h1 = 15 W/m2 K and h2 = 45 W/m2the effects of radiation.K, which includes

Given data Thickness of glass = 3mm Conductivity of glass = 0.78(W/m-k) Thickness of air gap = 8mm…

Consider a 0.6-m-high and 1.2-m-wide double-pane 0.78 W/m-K) separated by a 8-mm-wide stagnant a heat transfer (in W) through this double-pane windo while the temperature of the outdoors is 5°C. Take outer surfaces of the window to be h1 = 15 W/m2.K -

Consider a 0.6-m-high and 1.2-m-wide double-pane 0.78 W/m-K) separated by a 8-mm-wide stagnant a heat transfer (in W) through this double-pane windo while the temperature of the outdoors is 5°C. Take outer surfaces of the window to be h1 = 15 W/m2.K -

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

Consider a furnace (as a plane wall) which has a thickness of 15 cm and a surface area of 1 m?. The inside surface of the furnace wall (the hot left side of the wall) is at temperature T1. The furnace wall is made of brick with thermal conductivity of 1.198 W/m.K. The outside surface of the furnace wall (the right side of the wall) has a surface emissivity of 0.8 and is maintained at T2=101 °C and subject to air at 25 °C with convection heat transfer coefficient of 20 W/m?.K. The surroundings temperature at the outside of the furnace wall is at 25 °C. Required: Draw a clear and consistent schematic of the problem and label the operating conditions on the schematic. Perform systematic analysis, state your assumptions and justify the equation used and determine the following (circle your final answers): (i) The rate of heat transfer by convection (in W); (ii) The rate of heat radiation (in W); (iii) The surface temperature of the furnace wall T1 (in °C); (iv) The rate of conduction heat…
700 W/m3 electrical heat is generated in a large plane wall whose one side is insulated while the other side is subjected to convection. The thermal conductivity of the wall is (k W/m.K) and the convection heat transfer coefficient is (h = 17 W/m?K). Determine the location and the value for the maximum temperature and the minimum temperature in the plate for steady one-dimensional heat transfer. Assume T. = 25°C. A=1 m?; L= 25 cm). = 20
H.W1 Consider a person standing in a room. Determine the total rate of heat transfer from this person if the exposed surface area and temperature are 1.6m² and 29°C, respectively. Assume that the convection heat transfer coefficient is 6W/m².K and the emissivity of a person is 0.95. The air temperature in the room is maintained at 22°C at all times of the year. In summer, the wall and ceiling temperatures are observed to be 25°C, while in winter, they are 10°C. Ans: Qrotal =104.4 W In Summer Qrotal =231.3 W In Winter
The wall of a furnace consists of a 0.85 cm-thick layer of steel (ks = 15.1 W/m/K) and an outer layer of brick (kb = .72 W/m/K). The outer surface temperature of the brick, To = 50oC, and is exposed to convection with air at 20oC providing a heat transfer coefficient of 150 W/m^2/K. Determine the steady temperature at the steel brick interface, Tmid, and on the exposed steel surface, Ti, if the brick layer has thickness Lb = 5 cm.
Q) An apple has been put into a freezer at (-18°C) to be cooled. Initially, the apple is at a uniform temperature of 17°C. The convection heat transfer coefficient on its surface is 6 W/m2°C. Assuming the apple as a sphere having a diameter of 10-cm and taking its properties as p = 750 kg/m³, p = 2850 J/kg°c, and k = 0.450 W/m°C, determine; (a) the center temperature of the apple in 45 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.
Question 2:A circuit board houses on its surface120 closely spaced logic chips, each dissipating 0.12 W. If theheat transfer from the back surface of the board is negligible, calculate (a) the amount of heat this circuit board (15 cm x20 cm) dissipatesduring a 10-hour period, in kWh, and (b) the heat flux on thesurface of the circuit board, in W/m2
6-21 A metal plate is being cooled by air (kuid = 0.259 W/m-K) at the upper surface while the lower surface is subjected to a uniform heat flux of 1000 W/m2. Determine the temperature gradient in the air at the upper surface of the metal plate. FIGURE P6-21 Air,h, Tog T Metal plate 1000 W/m2
The outside temperature on a particular winter's day is 0°C. Consider two identical houses, each of external surface area 200 m² and internal temperature 20°C. The walls of the first are constructed of a single layer of brick, of thermal conductivity 1 W m-1 °C-1 and thickness 20 cm. What is the heat flux Q out of this house? What is its rate of heat loss in Watts? The walls of the second house are constructed of two layers of brick, each 10 cm thick, and a layer of insulation, also 10 cm thick. The insulation is made mostly out of air, thermal conductivity 0.01 W m of heat loss from this house? How different would your answer be if you neglected the layers of brick in this calculation? -1 °C-1. what are the heat flux and the rate
A pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kg/s. The pipe is 10 m long, has an inner diameter of 5 cm and pipe wall thickness of 6 mm. The pipe has a thermal conductivity of 17 W/m.K, and the inner pipe surface is at a uniform temperature of 120 °C. The temperature drop between the inlet and the exit of the pipe is 7 °C, and the constant pressure specific heat of vapor is 2190 J/kg.°C. If the air temperature in the manufacturing plant is 25°C, determine the heat transfer coefficient as a result if convection between the outer pipe surface and the surrounding air. T(r) = 120°C Superheated Air, 25°C r2 vapor r1 0.3 kg/s L = 10 m Tin-Tout = 7°C
The heat flux from a wall to air in motion having a heat transfer coefficient of 15 W/m². K and exposed to a temperature difference of 20 °C is www.bilibilitetit O 225 W O 300 W O 250 W O 375 W wwwwww