Question

Design of a Solar Thermal Power Plant The scheme of the solar thermal power plant is depicted in Figure 1. It features a Rankine-cycle based solar thermal power plant using tower technology. Technical data and assumptions: • = net electrical power output (turbine - pump) = 12 MW • Working fluid: water. • Condenser: outlet temperature = 320 K, outlet steam quality = 0%; no pressure drop through condenser. • Pump: adiabatic, outlet pressure = 170 bar; outlet temperature = 325 K. Solar receiver: outlet temperature = 850 K; blackbody (a= e = 1), perfectly insulated (no convection/conduction losses), no pressure drop through solar receiver. • Turbine: adiabatic, outlet steam quality = 78.5 %. No pressure drop or heat loss through the connecting lines. • Heliostat field: surface area of a single heliostat = 100 m²; p = reflectivity = 0.9. • C = solar concentration ratio at the entrance of solar receiver = 700. • I=Solar beam radiation=1 kW/m

Answer 1

* Wnel= 12 MW' Temdm Ouliel > 320 K Oul pet precs = Xl 170bor To=325H Solor ouput Temp: 8504. 78.5% Sire: T 250K P170 bay T3- 325 K: Stale: 1-2: Using steam table', Ti-850K Pi-170 bar hi: 3500 KTIkg. S, = 64 KTk • Sinre: N= 1o0/. Since: at point 2:.8 stale 2-3 T3 : 320 k at X= 0% ie Satuyation cod? at pel12.519 6i4= 3450 + · P3: Pe= l12-89 bor' T2= 320k . 0.785 CSq- St) T= 320K Similialy! he= Chpt x hPq) * 163 2.5t C785x966.4 2391.124 KTI kg. Stale 2-3. B: 112.29 ber T= 320 K: cs Scanned with CamScanner

hg = 1132.5 KTIkg. Ctale: 3-4: PA= 17obor To > 325 K. Wpomp = -vdp - Vipeckc velune of X CPa-Pe) waler O. 001500 x C170- |12.89)×105 8.656 KJ/K9. Cuovk is dame by pep henre -ve) lupmps chyt ha) 8.656=h4-16325 - 1641:156 KTlkg ' (T) Etholp diff . Stale l-2: Chi-he)> (35c0- 2391:124) - 1|08-6 KTI Kg Stale 3-2: Ch-has) = (299124 - 1632. 5) - 758:(24 KTG Stale: 4-3: Ch,- h3) = C141.15(-1632.5)- 8. (56 KTIKS stde l-4 : Ch- ha )= C3500- 1al.156)= 1858.844 KJIKG jv Moss flcup Whet tabine = 1108:6 unet pirp = 8-648 . Wrotol > 1I17.246 KJ/Kg BJ und = 12× 10 KW 12x10> m Cil17.24) m 10. 74 K/sec cs Scanned with CamScanner