01 07 16 sol

Page 1

Portata gas in HRSG 50 kg/s Dati cp gas 1.10 kJ/kgK Assunzioni Tgas 450.0 °C Tabelle vapore/Mollier peva 40.00 bar pvap sh 36.00 bar * calcoli necessari anche per la Tvap sh 420.00 °C risoluzione dei soli quesiti e-f-g h vap sh 3267.7 kJ/kg DTpinch point 10.00 °C DTsubcooling 10.00 °C cp liq sat 4.81 kJ/kgK Dp eco 10.00 bar Qloss HRSG 0.50 % eff. Idr. Pompa 0.75 eff. Mecc-el pompa 0.92 Tacqua cog in 90.00 °C Tacqua cog out 120.00 °C COP frigo ass. 0.70 U HRSG 400 W/m2K U cond 4000 W/m2K b) h liq sat @ 40 bar 1087.4 kJ/kg * h out eco 1039.3 kJ/kg * Dh acqua eva + sh 2228.3 kJ/kg * Teva 250.4 °C * Tgas pinch point 260.4 °C * Qgas eva+sh 10378.2 kW * m vap 4.66 kg/s * Tcond 130 °C * pcond 2.7 bar s vap sh 6.895 kJ/kgK his out turb 2667.3 kJ/kg Dhis turbina 600.4 kJ/kg eta is turbina vapore 0.85 Dh turbina 510.3 kJ/kg h out turbina 2757.3 kJ/kg h liq sat @ Tcond 546.3 kJ/kg * Dh cond 2211.0 kJ/kg * Qcond,cog 10297.5 kW * eta mecc-el turbina 0.96 P turbina 2281.6 kW Dp pompa 47.3 bar densità acqua 798.4 kg/m3 Dhis pompa 5.924 kJ/kg Dh pompa 7.90 kJ/kg Pel pompa 39.99 kW c) Qfrigo 7208.2 kW d) h in eco 554.2 kJ/kg hvap sat @ peva 2800.9 kJ/kg Qsh 2173.9 kW * Qeva 8204.3 kW * Qeco 2259.2 kW Tgas camino 219.1 °C = 492.22 K T0 15 °C = 288.15 K Tml camino-ambiente 381.1 K Eta Lorenz 0.244 Qcamino 11224.1 kW L rev gas camino 2738.1 kW e) Tgas uscita sh 410.28 °C DT1 sh 30.00 K DT2 sh 159.92 K LMTD sh 77.63 K A sh 70.0 m2 DT1 eva 159.92 K DT2 eva 10.00 K LMTD eva 54.08 K A eva 379.3 m2 f) DT1 40.00 K DT2 10.00 K LMTD cond 21.64 K A cond 119.0 m2 g) UA = cost => LMTD' = 0.5*LMTD_design = 10.82 K LMTD'=(DT1'-DT2')/ln(DT1'/DT2') DT1'-DT2' = DTacqua cog = 30.00 K ln(DT1'/DT2') = 2.773 DT1'/DT2' = 16.00 Tcond' = 122.0 °C