Engineering, 31.08.2020 01:01 juan01sebastian00

In some localities it is necessary that the illumination of a building comply with an energy code. These codes usually evaluate the illumination on the basis of the average per square foot (meter) of illumination load

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Engineering, 04.07.2019 19:20, littlepotato10

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.

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In some localities it is necessary that the illumination of a building comply with an energy code. T...