Considering Air-Conditioning Applications Figure P12.100 shows a device for condi...

Considering Air-Conditioning Applications

Figure P12.100 shows a device for conditioning moist air entering at 5°C, 1 atm, 90% relative humidity, and a volumetric flow rate of 60 m³/min. The incoming air is first heated at essentially constant pressure to 24°C. Superheated steam at 1 atm is then injected, bringing the moist air stream to 25°C, 1 atm, and 45% relative humidity. Determine for steady-state operation

(a) the rate of heat transfer to the air passing through the heating section, in kJ/min.

(b) the mass flow rate of the injected steam, in kg/min.

(c) If the injected steam expands through a valve from a saturated vapor condition at the valve inlet, determine the inlet pressure, in bar.

Neglect kinetic and potential energy effects.