18. An ideal Rankine cycle is presented in the figure below. This cycle is the basis behind steam power plants which manipulate the properties of a fluid (water, R134a, etc.) to

convert heat into electricity. The system is shown on the left. The representation of the cycle is on the right using a property diagram with temperature (T) and entropy (s) plotted. Each process is identified by the flow between each state (e.g. process 1-2, 2-3, 34, 41) Which process is isothermal? Why? W in Which processes are isentropic? Why? 2 pump boiler condenser Qour Qin 3 Turbine 4 W out T 3 A 1 4