Electric heating systems used in many homes consist of a simple duct with resistance heaters. As it flows over the resistance wires, the air is heated. Consider a 25 kW electric heating system. Air enters the heating section with an air flow rate of 120 m3 / min at 100 kPa and 12 ° C. If 150 W of heat is lost from the air in the duct to the environment, determine the exit temperature of the air

The observed element times and performance ratings collected in a direct time study areindicated in the table below. The snapback timing method was used. The PFD allowancein the plant is 14%.All elements are regular elements in the work cycle. Determine (a) thenormal time and (b) the standard time for the cycle.

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

Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa, 500°C, and 80 m/s, and the exit conditions are 30 kPa, 92 percent quality, and 50 m/s.