Consider a small room (3 m x 3 m x 2.4 m) filled with air that is initially at an outdoor temperature and pressure of 20°C and 100 kPa respectively. The room contains a 140 W lightbulb, a 120 W TV set, a 90 W computer, a 250 W amplifier and a 1200 W heater. Assuming no heat transfer through the walls, floor or ceiling, determine the rate of increase of the energy content of the room in kW when all of these electrical devices are on and what is the temperature rise of the air in the room after 3 minutes?
Consider a small room (3 m x 3 m x 2.4 m) filled with air that is initially at an outdoor temperature and pressure of 20°C and 100 kPa respectively. The room contains a 140 W lightbulb, a 120 W TV set, a 90 W computer, a 250 W amplifier and a 1200 W heater. Assuming no heat transfer through the walls, floor or ceiling, determine the rate of increase of the energy content of the room in kW when all of these electrical devices are on and what is the temperature rise of the air in the room after 3 minutes?
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Transcribed Image Text:Consider a small room (3 m x 3 m x 2.4 m) filled with air that is initially at an outdoor
temperature and pressure of 20°C and 100 kPa respectively. The room contains a 140 W
lightbulb, a 120 W TV set, a 90 W computer, a 250 W amplifier and a 1200 W heater.
Assuming no heat transfer through the walls, floor or ceiling, determine the rate of
increase of the energy content of the room in kW when all of these electrical devices are
on and what is the temperature rise of the air in the room after 3 minutes?
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