TITLE.PM5

558 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-1.pm5 = area l-1-2-3-m = area ‘o-l- 1 -n’ + area ‘1-2-q-n’ – area ‘o-m-3-q’ = ...

VAPOUR POWER CYCLES 559 dharm \M-therm\Th15-2.pm5 2 3 2 ′ 1 T s (b) 3 v 2 p 1 p 2 p 3 1 2 (2 bar) Loss of work due to incomplete ...

560 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 (iv)Brake thermal efficiency : Brake thermal efficiency = W hhf brake 1 ...

VAPOUR POWER CYCLES 561 dharm \M-therm\Th15-2.pm5 2 3 p V 2 ′ Loss of work due to incomplete expansion 1 p (10 bar) 400 C 1 º p ...

562 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 (v)Modified Rankine cycle efficiency, ηmR : ηmR = ()( )hh p pv hhf 12 2 ...

VAPOUR POWER CYCLES 563 dharm \M-therm\Th15-2.pm5 L N M M M M L N M M M M Energy/Heat balance equation for H.P. heater : m 1 (h ...

564 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 Disadvantages : The plant becomes more complicated. Because of additio ...

VAPOUR POWER CYCLES 565 dharm \M-therm\Th15-2.pm5 Energy balance for the feed heater is written as : mh 2 + (1 – m) hf 5 = 1 × h ...

566 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 1 2 4 3 5 6 7 30 bar 1 kg 5 bar m kg 0.1 bar (1 – m) kg (1 – m)kg 1 kg ...

VAPOUR POWER CYCLES 567 dharm \M-therm\Th15-2.pm5 (i)Efficiency of cycle, ηηηηηcycle : ηcycle = W Q T 1 = 934 8 2590 8 . . = 0.3 ...

568 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 (^0) T u r b i n e 1 kg 30 bar, 400 Cº 3 bar m 1 m 1 1 kg 130 Cº Heater ...

VAPOUR POWER CYCLES 569 dharm \M-therm\Th15-2.pm5 = 1(3231 – 2700) + (1 – 0.1672) (2700 – 2085) = 1043.17 kJ/kg Heat supplied pe ...

570 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 At heater No. 1 : m 1 h 1 + hf 2 = m 1 hf 1 + hf 1 m 1 = hh hh f f f 12 ...

VAPOUR POWER CYCLES 571 dharm \M-therm\Th15-2.pm5 (iii)Thermal efficiency of the Rankine cycle (iv)Theoretical gain due to regen ...

572 ENGINEERING THERMODYNAMICS dharm \M-therm\Th15-2.pm5 At 0.3 bar : hf 3 = 289.3 kJ/kg At 0.05 bar : hf 4 = 137.8 kJ/kg. (i)Ma ...

VAPOUR POWER CYCLES 573 dharm \M-therm\Th12-3.pm5 (ii)Thermal efficiency of the cycle, ηηηηηThermal : ηThermal = Work done Heat ...

574 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 Solution. (i) The schematic arrangement including feed heating system, ...

VAPOUR POWER CYCLES 575 dharm \M-therm\Th12-3.pm5 h s (^12) 3 4 5 6 3 ¢ 5 ¢ 6 ¢ 100 bar 25 bar 22 bar 6 bar 0.05 ba r 95 bar s 1 ...

576 ENGINEERING THERMODYNAMICS dharm \M-therm\Th12-3.pm5 ∴ ηoverall = 1039.55 2775.6 526.1+ × 100 = 31.48%. (Ans.) (iv) Specific ...

VAPOUR POWER CYCLES 577 dharm \M-therm\Th12-3.pm5 Fig. 12.24 shows a schematic diagram of a theoretical single-stage reheat cycl ...