An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and an evaporative cooler. air enters the heating section at 15°c and 55 percent relative humidity at a rate of 30 m5/min, and it leaves the evaporative cooler at 25°c and 45 percent relatively humidity. using appropriate software, study the effect of total pressure in the range 94 to 100 kpa and plot the results as functions of total pressure.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2