A laboratory has a volume of 700 m³ and must have one complete air change per minute when being used. Outside atmospheric air at 100 kPa, 30°C dry bulb, and 60 percent relative humidity is ducted into the laboratory air-conditioning equipment and conditioned to 20°C dry bulb and 12°C wet bulb, the required state for air supplied to the laboratory.

(a) Sketch the system hardware and the psychrometric diagram for the process.

(b) What outside atmospheric air mass flow rate is required for the air change, in kg/h?

(c) Determine the mass flow rate of water condensed from the atmospheric air, in kg/min.

(d) The cooling fluid in the air-conditioning system is chilled water, which has a 15°C temperature rise during the heat exchange process. Determine the chilled water mass flow rate, in kg/min.