To refresh air in a room, a counter flow heat exchanger (see Fig. P11.122) is mounted in the wall, drawing in outside air at 0.5◦C, 80% relative humidity and pushing out room air at 40◦C, 50% relative humidity. Assume an exchange of 3 kg/min dry air in a steady-flow device, and also assume that the room air exits the heat exchanger at 23◦C to the outside. Find the net amount of water removed from the room, any liquid flow in the heat exchanger, and T, φ for the fresh air entering the room.

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Wall 2) Outside air Room 3 air 4 FIGURE P11.122