TITLE.PM5

578 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 Note. Superheating of steam. The primary object of superheating steam a ...

VAPOUR POWER CYCLES 579 dharm \M-therm\Th12-3.pm5 Advantages of ‘Reheating’ : There is an increased output of the turbine. Eros ...

580 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 Amount of heat supplied during process of reheat, hreheat = (h 3 – h 2 ...

VAPOUR POWER CYCLES 581 dharm \M-therm\Th12-3.pm5 (i)Quality of steam at turbine exhaust, x 4 : x 4 = 0.88 (From Mollier diagram ...

582 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 Heat supplied = h 1 – hf 2 = 3250 – 173.9 [hf 2 = 173.9 kJ/kg at 0.08 b ...

VAPOUR POWER CYCLES 583 dharm \M-therm\Th12-3.pm5 h s 4 2 1 3 Reheating Sat. curve T = const. Condenser pressure (c) In a 15 MW ...

584 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 T ss 5 5 ¢ 0.1 bar 40 bar 0.1 bar 150 bar 150 bar 1 331 (^22) 4 4 h 600 ...

VAPOUR POWER CYCLES 585 dharm \M-therm\Th12-3.pm5 If we use steam as the working medium the temperature rise is accompanied by r ...

586 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 Some undesirable properties of mercury are listed below : Since the la ...

VAPOUR POWER CYCLES 587 dharm \M-therm\Th12-3.pm5 Total work done in the binary cycle is given by Wt = m Whg + Ws ...(12.17) ∴ O ...

588 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 From the eqns. (12.18), (12.20), (12.21), (12.22) and (12.23), we get η ...

VAPOUR POWER CYCLES 589 dharm \M-therm\Th12-3.pm5 Mercury cycle : hl = 355.98 kJ/kg sl = 0.5397 = sm = sf + xm sfg or 0.5397 = 0 ...

590 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 = 0.31 + 0.318 – 0.31 × 0.318 = 0.5294 or 52.94% Hence overall efficien ...

VAPOUR POWER CYCLES 591 dharm \M-therm\Th12-4.pm5 = 838.46 kJ/kg (WT)total = 11.06 × 84.92 + 838.46 = 1777.67 kJ/kg Neglecting p ...

592 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-4.pm5 60 bar, 450°C 1kg^1 2 ¢ Boiler Turbine 3barmkg 5 5 Feed heater Pump Pum ...

VAPOUR POWER CYCLES 593 dharm \M-therm\Th12-4.pm5 (ii) Steam generated per hour : Work developed per kg of steam in the turbine ...

594 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-4.pm5 1 2 Boiler H.P. 0.4 bar 4 Condenser 3 Superheater 1kg 80 bar 80 bar Reh ...

VAPOUR POWER CYCLES 595 dharm \M-therm\Th12-4.pm5 (ii) The boiler generating capacity : If ms is the mass of steam supplied to t ...

596 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-4.pm5 s h h 4 h 2 h 3 h 1 1 80 bar 7 bar 0.035 bar 4 2 3 ( )bh-sdiagram 470°C ...

VAPOUR POWER CYCLES 597 dharm \M-therm\Th12-4.pm5 (iv) Cycle efficiency, ηcycle : Amount of work done by per kg of steam generat ...