glass each 4mm thick separated by a 23mm air gap. This window is a replacement for a single glazed unit. The double glazed unit is installed in the wall of a room in which the air temperature is maintained at 23 degreesC, the outer surface of the window is exposed to the atmospheric temperature which is 2 degreesC. The surface heat transfer coefficient of the room side glass is 5.7 W/m?K and 9.1 W/m?K on the outer surface of the window. The thermal conductivity of the glass is known to be 0.76 W/mK. i) On the assumption that the air gap between the layers may be regarded as a stationary layer of air of thermal conductivity 0.026 W/mK, calculate the heat transfer rate through the window and the temperature of the room side surface of the glass. ii) Calculate the heat transfer rate for the single glazed unit which has been replaced. The window was of the same dimensions consisting of a single pane of glass. It may be assumed that all of the remaining data are unchanged.

glass each 4mm thick separated by a 23mm air gap. This window is a replacement for a single glazed unit. The double glazed unit is installed in the wall of a room in which the air temperature is maintained at 23 degreesC, the outer surface of the window is exposed to the atmospheric temperature which is 2 degreesC. The surface heat transfer coefficient of the room side glass is 5.7 W/m?K and 9.1 W/m?K on the outer surface of the window. The thermal conductivity of the glass is known to be 0.76 W/mK. i) On the assumption that the air gap between the layers may be regarded as a stationary layer of air of thermal conductivity 0.026 W/mK, calculate the heat transfer rate through the window and the temperature of the room side surface of the glass. ii) Calculate the heat transfer rate for the single glazed unit which has been replaced. The window was of the same dimensions consisting of a single pane of glass. It may be assumed that all of the remaining data are unchanged.

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

PROBLEM 1Consider an adult human standing in the centre of a closed room. The air and room’swalls, ceiling and floor surrounding the being are at a temperature of 25oC. Assume forthe adult body a temperature of 37oC, a surface area of 1.7m2, an emissivity of 0.95 andthe heat transfer coefficient of 6 W/m2K for natural convection between the air and thebody. Question:(a) Describe the modes of heat transfer between the adult human and theirsurroundings. What are some assumptions that must be made before calculatingthe heat transfer rates?(b) Determine the total rate of heat transfer from the adult into their surroundings.
A 30-m-long hot rod (Diameter = 100-mm) is placed inside a room whose walls and air are at 25 C. The surface temperature of the rod is 150 C. h=10 W/m K. The surface emissivity is: your student number/10. What is the rate of heat loss from the rod? student number =201810372 %3D
A household oven door of 0.4 m height and 0.6 m width reaches an average surface temperature of 50°C during operation. Estimate the total heat loss to the room with ambient air at 22°C and convective heat transfer coefficient 5 W/m².K, if the door has an emissivity of 0.83 and the surroundings are also at 22°C.
Hot-surface temperature of a 12-mm thick fire brick wall is maintained at 913 K. If the average thermal conductivity of the wall material is 0.123 W/m.K. Determine the maximum heat loss through the wall to ensure its cold-surface temperature does not exceed 364 K. For an ambient air temperature of 292 K, what is the surface coefficient of the wall material?
1. (a) Consider a room with a 1.8-m-high and 2.0-m-wide double-pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m2 K and 25 W/m2 K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22 oC, the outside temperature is -4 oC and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network; (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window; (iv) the temperature of the inner surface of the window.…
How does a fin enhance heat transfer at a surface?
A dry-ice storage chest is a wooden box lined with glass fiber insulation 5 cm thick. The wooden box is 2 cm thick and is cubical, 60 cm on an edge. The inside surface temperature is -76 RC, and the outside surface temperature is 18 RC, Determine (a) the wood insulation interface temperature; (b) the heat gain per day.
A cylindrical resistor element on a circuit board dissipates 0.22 W of power in an environment at 28°C. The resistor is 1.2 cm long, and has a diameter of 3 mm. Assuming heat to be transferred uniformly from all surfaces. What is the surface temperature of the resistor for a combined convection and radiation heat transfer coefficient of 13 W/m . C?
Please check attach file
The rear window of an automobile is defogged by passing warm air over its inner surface. If the warm air is at T = 40°C and the 30 W/m2-K, what are corresponding convection coefficient is h; the inner and outer surface temperatures, in °C, of 4-mm-thick window glass, if the outside ambient air temperature is To || 0,0 -30°C and the associated convection coefficient is ho W/m2-K? Evaluate the properties of the glass at 300 K. = 65 Tsi i °C Ts.0 °C T5,0 i
Solve it correctly please. I will rate accordingly with 4votes but I need correct answer.
Can you help me answer my sample problem for my review?