This homework is to be solved using concepts from sections 7.1 to 7.7 of your textbook and other prior sections in chapters 6 and 5. Solutions that include entropy balance concepts will not be accepted (sections 7.13 and 7.12) Note: for this homework, all thermodynamic properties must be retrieved using the tables in your textbook. Please include the table number you used. Problem 1 As you learned in chapter 6 while understanding the basics of the Second Law of Thermodynamics, a steam power plant can be represented as a heat engine by assembling the devices shown in the figure on the right, where qin is supplied from a source and qout is rejected to a sink. Wpump,in qin Boiler Pump Wturb,out Turbine Assume that all devices shown in the figure are adiabatic and reversible. Water enters the pump as saturated liquid and leaves the pump at 1 MPa and approximately at the same temperature it entered, leaves the boiler as saturated vapor, enters the turbine and leaves the turbine D-1 Condenser Yout as a saturated mixture with quality 85% and a pressure equal to 20 kPa. Also changes in kinetic and potential energy on any device may be assumed to be negligible compared to changes in other properties, and there are no fluid pressure losses as it passes through the boiler and the condenser, or as it travels from one device to the next. e. You as an engineer realized that you want to have a cycle with better thermal efficiency for the same boiler and condenser pressures. You realize by looking at your governing equations for each device and for the efficiency of the heat engine that decreasing the value for qout may bring benefit to your goal however you do not know by how much. Thus, you decided to investigate how cycle efficiency changes with qout for better of for worse. What parameter would you change at the exit of the turbine if you wish to increase or decrease qout? Support your answer with an equation and appropriate explanations. List your assumptions. Note that no computations are required beyond understanding the expressions that you wrote.