Required information Sometimes equations can be developed and practical problems solved by knowing nothing more than the dimensions of the key parameters. For example, consider the heat loss through a window in a building. Window efficiency is rated in terms of R value, which has the unit of ft2.hr-°F/Btu. A certain manufacturer offers a double-pane window with R = 2.5 and also a triple-pane window with R-3.4. Both windows are 6 ft by 5.25 ft. On a given winter day, the temperature difference between the inside and outside is 45°F. Develop an equation for window heat loss Q in time period At as a function of window area A, R value, and temperature difference AT Multiple Choice Q = ΔΙΔΤΑΙΡ O Q=ATA/RAT O Ο = ΔΙΔ ΤΑΡΣ Q=ATA/ATR²
Required information Sometimes equations can be developed and practical problems solved by knowing nothing more than the dimensions of the key parameters. For example, consider the heat loss through a window in a building. Window efficiency is rated in terms of R value, which has the unit of ft2.hr-°F/Btu. A certain manufacturer offers a double-pane window with R = 2.5 and also a triple-pane window with R-3.4. Both windows are 6 ft by 5.25 ft. On a given winter day, the temperature difference between the inside and outside is 45°F. Develop an equation for window heat loss Q in time period At as a function of window area A, R value, and temperature difference AT Multiple Choice Q = ΔΙΔΤΑΙΡ O Q=ATA/RAT O Ο = ΔΙΔ ΤΑΡΣ Q=ATA/ATR²
Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment
Section: Chapter Questions
Problem 1CE
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
Transcribed Image Text:Required information
Sometimes equations can be developed and practical problems solved by knowing nothing more than the dimensions of
the key parameters. For example, consider the heat loss through a window in a building. Window efficiency is rated in
terms of R value, which has the unit of ft2.hr-°F/Btu. A certain manufacturer offers a double-pane window with R = 2.5 and
also a triple-pane window with R-3.4. Both windows are 6 ft by 5.25 ft. On a given winter day, the temperature difference
between the inside and outside is 45°F.
Develop an equation for window heat loss Q in time period At as a function of window area A, R value, and temperature difference AT
Multiple Choice
Q = ΔΙΔΤΑΙΡ
O
Q=ATA/RAT
O
Ο = ΔΙΔ ΤΑΡΣ
Q=ATA/ATR²
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