Question

A Rankine cycle with reheat and 2 non-ideal turbines has the following relevant states. - Water leaves the condenser as a saturated liquid with a pressure of 80.0 kPa As it passes through the ideal pump, it is raised to a pressure of 7 MPa The high pressure turbine has an isentropic efficiency of 91.0% The low pressure turbine has an isentropic efficiency of 91.0%. - The boiler raises adds heat isobarically until the substance has a temperature of 350 ° C. The reheating process raises the substance to the same temperature - The intermediate pressure between the turbines is 3.5 MPa High-P Low-P High-pressure Low-pressure Reheater Boiler Enthalpy values Not graded. Will give feedback if all are filled out. What are your values for specific enthalpy hn? Property State 4a 6a h kJ/kg Final values (graded) What is the net specific work generated by the cycle? kJ/kg What is the total specific heat input at the boiler? 激活Wi 转到"设置" kJ/kg What is the thermal efficiency of the cycle?

Answer 1

350 Given that he bins5.5 MPa 7MPa 2 e Sure turbin at pumpnlet w, h,-h, 0.001037000- h, - 7-1818 t 391.7 al high pessine bi t i at siak ) bnine at 7 Mpa, 350c fam sleam tables S3 - 6.235 k3lk mm scan tables at 35 Mpa, 250c -> S6173 k k to find out tonptrature at stak H, u inte polation we 6. 233 - 6.173T250 300- 2So T4 260.849

fon stean table at 35 pa. 250( -) h ; 28 2.05 kJ/Kg 260 . 849°c tofndurtenlhaks 35m pa ue uic inkipique at 260:849-250 300-250 hケー 282 f.05 ㄹ 2860.7 kJlk hish pul tur bine 0.1 3018.7 018.7-2 80.781 at nt low presure arbine at 3.5Mp, 3500 sean Glab les at 8o Kpa) 66631233 + x (6.201) 6 419.1 t 0.2755( 2256.7ノ isen tooi

0.91310 6.4s-he 310645-2315. os 9 lW wW wncl (3018.1-2 874, 99)-(3106.45. 211 5.045 38.88-311.7 ale-f heat input at the biler 2 5 Iin - 2851. 28 K3Ikj rv) LT 783.925. 28 51, 28