has an area of 5.5 ft² of 5 mm. If one side is at a temperature of 45° F and the other is at 23° F, how much thermal energy (BTU/year) flows through the window in one year? The thermal conductivity of glass is 1.89x10-4 kcal/m-s-K. 2. A glass window and a thickness

has an area of 5.5 ft² of 5 mm. If one side is at a temperature of 45° F and the other is at 23° F, how much thermal energy (BTU/year) flows through the window in one year? The thermal conductivity of glass is 1.89x10-4 kcal/m-s-K. 2. A glass window and a thickness

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

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Question 1: A glass window of width W = 1 m and height H = 2 m is 5 mm thick and has a thermal conductivity of kg =1.4 W/m.K. If the inner and outer surface temperatures of the glass are 15 oC and -20 oC, respectively, on a cold winter day, what is the rate of heat loss through the glass? To reduce heat loss through windows, it is customary to use a double pane construction in which adjoining panes are separated by an air space. If the spacing is 10 mm and the glass surfaces in contact with the air have temperatures of 24 oC and -15 oC, what is the rate of heat loss from a 1 m x 2 m window? The thermal conductivity of air is ka = 0.024 W/m.K.
The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -8 C and outer wall is at 27 C. Insulator is used to prevent the heat losses from the compartment. The shape is in square form with a side of 1.1 m and unit width into the page. Determine the conductivity of the insulator if the compartment heat load is 250 W? Take the thickness of the insulator as 1.5 cm* *inner wall outer wall insulating material 0.045 W/(mk) 0.035 W/(mK) 0.097 W/(mk) none 0.024 W/(mK)
If 3 kW is conducted through a section of insulating material 0.6 m2 in cross section and 2.5 cm thick and the thermal conductivity may be taken as 0.2 W/m · ◦C, compute the temperature difference across the materia
Variation of the surface temperature of a pin fin is shown in the Figure. According to the figure, the following statements are made. 1-Fin is insulated perfectly. 2-The fin is in an environment with a temperature of 80 °C. 3-The efficiency of the fin is 1. 4-The heat conduction at the base of the fin is not higher than that of the tip. 5-The heat conduction at the middle of the pin is zero. Choose the correct option. 80°C 80 80 80 80°C O a. 3, 4 and 5 are correct, the rest are wrong O b. 4 and 5 are wrong, the rest are true O c. All statements are correct O d. 1 and 2 are correct, the rest are wrong O e. 4 is wrong, the rest are correct
The figure shows the cross section of a wall made of three layers. The thicknesses of the layers are L1. L2 =0.500 L1. and L3 = 0.350 L1. The thermal conductivities are k1, k2 = 0.800 k1, and k3 = 0.680 k1. The temperatures at the left and right sides of the wall are TH = 20 °C and Tc = -10 °C, respectively. Thermal conduction is steady. (a) What is the temperature difference AT2 across layer 2 (between the left and right sides of the layer)? If k2 were, instead, equal to 1.100 k1, (b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously, and (c) what would be the value of AT2? k1 ko k3 TH Tc L1 L9 L3 (a) AT2 = i (b) (c) AT2= i
please answer within 40 minutes please show complete solutions and detailed drawings. show conversions, units, and box in the final answers
A glass with an area of 0.625 m² is fit in the wooden outside wall of a room. The dimension of wall is 25 x 3.05 m , The wood has a thermal conductivity of 0.151W/m.K and is 3.05 cm thick. The glass has a thermal conductivity of 0.692W/m.K and is 5.0 mm thick. The temperature of the inside room is 27°C and outside air temperature is 268K. calculate ,What is the heat loss through wooden wall and glass window? What are the total heat loss?
ödaly übäi The thermal resistance of the wall is : given by k/AL L/kA kL/A None نقطة واحدة When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by radiation convection conduction and convection conduction
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The cross-section of a wooden wall is shown in the figure. Compute for the temperature on the right side of the wall, T2, in degrees Celsius if the left side temperature, T1 = 88 C; the thermal conductivity of the wall, k = 0.08 W/m-C; and the thickness of the wall, L = 0.11 m. The wall is exposed to natural convection on the right side with h = 4 W/m2-C and the bulk fluid temperature, T, = 9 C.
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