Question

5. (25 points) Consider an ideal steam regenerative Rankine cycle in which steam enters the turbine at 3.0 MPa, 400°C, and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.8 MPa for an open feedwater heater. The feedwater leaves the heater as saturated liquid. The appropriate pumps are used for the water leaving the condenser and the feedwater heater. Calculate the thermal efficiency of the cycle and the net work per kilogram of steam. a. (5 points) Draw a diagram of this cycle including every process. Label your states (1, 2, etc.). b. (15 points) Calculate the net work per kg of steam c. (5 points) Calculate the efficiency of the cycle.

please use Rankine cycle. write the solution clearly

Answer 1

3mpa WPI 10kpa 1 Prekare kneet 3mp 400c Condensee lokea . Pump P = he hav, (P2 - P.) 1 = 0.00101(800-10) = 0.798 Kilis hazhe twpi = 191.81 +0.798 - 192.61 kJ/is futh (feed water heater) x = har h2 7211 - 192061 -0.1958 2891.6 - 192.61 c Pump P WB > hurha= V₂ (Pur Ps): 0,00/115 (3000-800) = 2.45 kilns hus hat WP = 721.14 2.45 = 723.55 kg/es cu boiler = hs-hu=3230.82-723.55 = 2507-369/19 Cu Presine and law 82 = 50 g = 69211 kilios ic P6, S6 ) he = 2891.6 kilies (Super heated vapan) 37=Sq 25 = 6.921 =) Yg = 6.9211-0.6497 0.83614 7.50 hor 191.814 g 23928222192.55 ks/les Pursue has full flow in tp section and fraction l-xmin ipsection Waling-his-ho +(-x) Chorha) Wy: 3230.82-2891,6 of (1-0. 1988 (2891.6-2192,55) - 899.345/19 What a WT-(1-x)WP - We = 899.3. C.-0.1988) 0.798 -2.45 = 896+2 KJ/kg Regele a Waat lay = 8962/2007 3 = 0.357.