A cooling tower is a device that cools a spray of water by passing it through a stream of air. If 15 m3/s of air at 30°C dry-bulb and 20°C wet-bulb temperature and an atmospheric pressure of 90 kPaa enters the tower and the air leaves saturated at 28°C. This air stream cool a spray of water entering at 35°C with a flow rate of 20 kg/s. What is the partial vapor pressure of entering air in kPaa?

A mass flowrate of 1 Ibm/s of water at 80 F and 70 pisa is mixed with 1 Ibm/s of saturated vapor water at 70 psia in a mixing chamber. During this process 100 Btu/s of heat is lost from the mixing chamber to the surrounding environment. The exiting stream leaves the mixing chamber at 70 psia. In the question that follows, select the answer that is closest to the true value. What is the quality of the exiting stream ?

Question 6 Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 10 MPa, 450°C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s. The mass flow rate of the steam is 12 kg/s. Determine (a) the change in kinetic energy (b) the power output, (c) the turbine inlet area. Answers: (a)-1.95 kJ/kg, (b) 10.2 MW, (c) 0.00447 m² P-10 MPa 7₁-450°C V₁ = 80 m/s STEAM m = 12 kg/s P₂ = 10 kPa 4,-0.92 V₂ = 50 m/s out