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3. A local health department is erecting electronic display boards to promote public health and social distancing. Each display board is 1-m by 2-m. The authorities are debating whether to use them in portrait orientation or in landscape orienta- tion. You want to contribute to this discussion by calculating the heat transfer rate from the display surface (no need to worry about the back surface, that is perfectly insulated). The heat transfer from the display surface contributes to the energy con- sumption of these displays. You know that the average wind speed in the locality in April is 0.7 miles-per-hour, and wind temperature is 2.2°C. But since the locations of displays are not finalized, you do not know the exact position of the displays with respect to the direction of the wind. So to cover all your bases, you assumed that the wind can flow either parallel or perpendicular to the board. Considering all these combinations, calculate which orientations (i.e., portrait, landscape) and positions (i.e., parallel, perpendicular, etc.) with respect to prevalent wind direc- tion will provide either maximum or minimum heat loss from the board. List the maximum and minimum heat transfer rates obtained. The surface of the board can be considered to be at uniform 20°C. мах Landscape flow! perpend. plate from the back 8 = 588 1 an all Mini Portrait parallel : 9"=27=2 / ²2 This is portrait orientation. The height is larger than the width This is landscape orientation. The height is smaller than the width

3. A local health department is erecting electronic display boards to promote public health and social distancing. Each display board is 1-m by 2-m. The authorities are debating whether to use them in portrait orientation or in landscape orienta- tion. You want to contribute to this discussion by calculating the heat transfer rate from the display surface (no need to worry about the back surface, that is perfectly insulated). The heat transfer from the display surface contributes to the energy con- sumption of these displays. You know that the average wind speed in the locality in April is 0.7 miles-per-hour, and wind temperature is 2.2°C. But since the locations of displays are not finalized, you do not know the exact position of the displays with respect to the direction of the wind. So to cover all your bases, you assumed that the wind can flow either parallel or perpendicular to the board. Considering all these combinations, calculate which orientations (i.e., portrait, landscape) and positions (i.e., parallel, perpendicular, etc.) with respect to prevalent wind direc- tion will provide either maximum or minimum heat loss from the board. List the maximum and minimum heat transfer rates obtained. The surface of the board can be considered to be at uniform 20°C. мах Landscape flow! perpend. plate from the back 8 = 588 1 an all Mini Portrait parallel : 9"=27=2 / ²2 This is portrait orientation. The height is larger than the width This is landscape orientation. The height is smaller than the width

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
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3. A local health department is erecting electronic display boards to promote public health and social distancing. Each display board is 1-m by 2-m. The authorities are debating whether to use them in portrait orientation or in landscape orienta- tion. You want to contribute to this discussion by calculating the heat transfer rate from the display surface (no need to worry about the back surface, that is perfectly insulated). The heat transfer from the display surface contributes to the energy con- sumption of these displays. You know that the average wind speed in the locality in April is 0.7 miles-per-hour, and wind temperature is 2.2°C. But since the locations of displays are not finalized, you do not know the exact position of the displays with respect to the direction of the wind. So to cover all your bases, you assumed that the wind can flow either parallel or perpendicular to the board. Considering all these combinations, calculate which orientations (i.e., portrait, landscape) and positions (i.e., parallel, perpendicular, etc.) with respect to prevalent wind direc- tion will provide either maximum or minimum heat loss from the board. List the maximum and minimum heat transfer rates obtained. The surface of the board can be considered to be at uniform 20°C. / 1 мах Landscape w/ flow! hitting perpend. plate from to the back 8=58'8 Min: Portrait parallel :9"-2724/12²2 This is portrait orientation. The height is larger than the width This is landscape orientation. The height is smaller than the width
Transcribed Image Text:3. A local health department is erecting electronic display boards to promote public health and social distancing. Each display board is 1-m by 2-m. The authorities are debating whether to use them in portrait orientation or in landscape orienta- tion. You want to contribute to this discussion by calculating the heat transfer rate from the display surface (no need to worry about the back surface, that is perfectly insulated). The heat transfer from the display surface contributes to the energy con- sumption of these displays. You know that the average wind speed in the locality in April is 0.7 miles-per-hour, and wind temperature is 2.2°C. But since the locations of displays are not finalized, you do not know the exact position of the displays with respect to the direction of the wind. So to cover all your bases, you assumed that the wind can flow either parallel or perpendicular to the board. Considering all these combinations, calculate which orientations (i.e., portrait, landscape) and positions (i.e., parallel, perpendicular, etc.) with respect to prevalent wind direc- tion will provide either maximum or minimum heat loss from the board. List the maximum and minimum heat transfer rates obtained. The surface of the board can be considered to be at uniform 20°C. / 1 мах Landscape w/ flow! hitting perpend. plate from to the back 8=58'8 Min: Portrait parallel :9"-2724/12²2 This is portrait orientation. The height is larger than the width This is landscape orientation. The height is smaller than the width
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