Moist air is at 30.0°cdb, 45.0 percent relative humidity, and 1.00 atm. determine the following: (a)partial pressure of air and water vapor (b)mole fraction of air and water (c)dewpoint temperature (d)humidity ratio (e)specific enthalpy

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 the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct.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.