Question

An ideal reheat Rankine cycle with water as the working fluid operates the inlet of the high-pressure turbine at 8000 kPa and 450°C, the inlet of the low-pressure turbine at 300kPa and 500°C, and the condenser at 10 kPa. Determine the mass flow rate through the boiler needed for this system to produce a net 5000 kW of power and the thermal efficiency of the cycle.

Answer 1

Pg Noool 4 온 Ty=500°c T = 450°C 8 MPa 300 kPa 3 Lokpa 6 as is shown for the ideal Reheat diagram The Tas Ranking de using stoan tables and Mollion clant, we determine enthalpy values at different stake points.

fg No.03 At NY to upa, 2.15 kg/ng.k But sa 8.33 kJ/g. a. Hence the steam is entering Condenses at super treated state. from Mollies chart, we get as= 2600 kJ /ng: Point (6) fa lokpad from stoom table, he= he@ 10 kPa = 191.812 weg/ig. kolaget hp = 191.812 kJ /ung. So = Sf - S @ loupa=0.649 Point cui at W = we have Pump work a(4,-46) = 2 (P.-P). lokpa, 0.001 milioni h - 191.812 = 18000- olx 0:001. 199.8 kiling تنها - Thus we got all the enthalpy values The not work done can be given by Whet in (h2-43) + (hy-hs) - (4, -ha)). m (3272-22- m (3272-82-2551:29)+ ( 3486:09-2600) -( 199.8 - 191.812) in (1662.632) kw. required wordone, oret - 5000 kw m(1602 632) - 5000 2 Whet But