Answer Happy

You are designing a Rankine cycle with water as the working fluid. You have the option to adopt a reheat cycle (1-2-3-4-5-6, schematic on the left) or to just have a simpler cycle (A-B-C-D, schematic on the right). Property data at most state points are provided in the table below for both cycles. The pump for each cycle has an isentropic efficiency of 0.9, but the turbines are assumed to operate isentropically. Other common assumptions include: turbines and pump are adiabatic; flows in steam generator and condenser having negligible pressure drop; negligible KE and PE effects in the system. a) Fill in the missing data in the tables below, show your work when needed; (For the data already provided, you don't need to re-evaluate. Ignore the cells with "/" in them.) (Hint: the h value for state 6 is the same as for state D, so you only need to find it once.) b) Find ratio of the thermal efficiencies for the two cycles, reheat/nno reheat Reheat section S Low-pressure turbine Steam generator Turbine High- pressure turbine Steam generator Condenser Pump D Pump B Condemer
State 1 2 3 4 5 6 0.8 P. (bar) 80 7 7 -08 7 T (C) 600 1 h (kJ/kg) 3642 3550 2430 174 State ABCD p (bar) 80 0.840 0.8430 T(C) 600 T 1 h (kJ/kg) 3642 2227 174