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Elements Of Electromagnetics
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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A 1.25-m high by 2.5-m wide window is inset from the face of the wall 0.15 m. Calculate the shading provided by the inset at 2 P.M. sun time if the window is facing south at 32° north latitude, August 21 Determine the total thermal resistance of a unit area of the wall section shown in Fig. HOutside air film Face brick, 90 mm Air space Sheathing, 13-mm fiberboard Insulation, 75-mm mineral fiber Air space Gypsum board, 13 mm Inside air film Determine the peak heat gain through a west-facing brick veneer wall (similar in cross section- to that shown in above), July 21 at 40° north latitude. The inside temperature is 25°C, and the average daily temperature is 30°C. An office in Houston, Texas, is maintained at 25°C and 55 percent relative humidity. The average occupancy is five people, and there will be some smoking. Calculate the cooling load imposed by ventilation requirements at summer design conditions with supply air conditions set at 15°C and 95 percent relative humidity if (a) the recommended rate of outside ventilation air is used and (b) if a filtration device of E = 70 percent is used. Compute the heat gain for a window facing southeast at 32° north latitude at 10 A.M. central daylight time on August 21. The window is regular double glass with a 13-mm air space. The glass and inside draperies have a combined shading coefficient of 0.45. The indoor design temperature is 25° C, and the outdoor tempera ture is 37°C. Window dimensions are 2 m wide and 1.5m high. The window in previous Prob. has an 0.5-m overhang at the top of the window. How far will the shadow extend downward?
Transcribed Image Text:A 1.25-m high by 2.5-m wide window is inset from the face of the wall 0.15 m. Calculate the shading provided by the inset at 2 P.M. sun time if the window is facing south at 32° north latitude, August 21 Determine the total thermal resistance of a unit area of the wall section shown in Fig. HOutside air film Face brick, 90 mm Air space Sheathing, 13-mm fiberboard Insulation, 75-mm mineral fiber Air space Gypsum board, 13 mm Inside air film Determine the peak heat gain through a west-facing brick veneer wall (similar in cross section- to that shown in above), July 21 at 40° north latitude. The inside temperature is 25°C, and the average daily temperature is 30°C. An office in Houston, Texas, is maintained at 25°C and 55 percent relative humidity. The average occupancy is five people, and there will be some smoking. Calculate the cooling load imposed by ventilation requirements at summer design conditions with supply air conditions set at 15°C and 95 percent relative humidity if (a) the recommended rate of outside ventilation air is used and (b) if a filtration device of E = 70 percent is used. Compute the heat gain for a window facing southeast at 32° north latitude at 10 A.M. central daylight time on August 21. The window is regular double glass with a 13-mm air space. The glass and inside draperies have a combined shading coefficient of 0.45. The indoor design temperature is 25° C, and the outdoor tempera ture is 37°C. Window dimensions are 2 m wide and 1.5m high. The window in previous Prob. has an 0.5-m overhang at the top of the window. How far will the shadow extend downward?
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