11rankine_regen - ⋅ ⋅ comparison of rankine with single regeneration kPa:= 10 3 ⋅ Pa MPa:= 10 6 Pa basic reference problem 3 kJ:= 10 3 ⋅ J

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ⋅ ⋅ comparison of rankine with single regeneration kPa := 10 3 ⋅ Pa MPa := 10 6 Pa basic reference problem ... 3 kJ := 10 3 ⋅ J bar := 0.1MPa Rankine_class_example.mcd kN := 10 ⋅ N state 1: condenser outlet same as reference 3 Table 1 or Table A.1.1 T 1 := 40 p 1 := 7.384kPa v f_1 := 0.0010078 m v 1 := v f_1 kg kJ kJ kJ kJ s f_1 := 0.5725 kg K s 1 := s f_1 s fg_1 := 7.6845 kg K h f_1 := 167.57 kg h fg_1 := 2406.7 kg h 1 := h f_1 state 2: pump outlet assume v f = v 1 constant, isentropic, ds = 0 =>T*ds= 0 => h2 = h1+v1*dp from relationships Tds = dh + v*dp integrated with constant v and Tds = 0 p 2 := 30bar s 2 := s 1 := + ⋅ − = 170.586 kJ h 2 h 1 v 1 ( p 2 p 1 ) h 2 kg kJ kJ w p := h 1 − h 2 using C Cp := 4.184 actual units kg kg K p ⋅ w p = − 3.016 kJ and ... eqn 5.18 h 2 − h 1 = Cp ⋅ ( T 2 − T 1 ) T 2 := T 1 + h 2 − h 1 T 2 = 40.721 kg Cp state 3: boiler outlet p 3 := p 2 T 3 := 460 p 3 = 3 MPa interpolation kJ kJ from interpolation Table A.1.3 P=3MPa page 622 h 3 = 3366.5 s 3 = 7.113 kg kg K ⋅ state 4: turbine outlet isentropic expansion to 40 deg C s 4 := s 3 determine h 4 from x s 4 − s f_1 s 4 = s f_1 + x s ⋅ fg_1 => x := x = 0.851 s fg_1 kJ kJ h 4 := h f_1 + h fg_1 ⋅ x h 4 = 2216 w t := h 3 − h 4 w t = 1150 kg kg thermal efficiency work_net Q H + Q L w t + w p ( h 3 − h 4 ) + ( h 1 − h 2 ) = = = = η th Q H Q H Q H h 3 − h 2 − − − + w ( h 3 h 4 ) ( h 2 h 1 ) w t p η th := h 3 − h 2 η th = 0.359 th η := h 3 − h 2 η th = 0.359 Q H := h 3 − h 2 Q L := h 1 − h 4 Q H + Q L η th_1 := Q H η th_1 = 0.359 10/17/2005 1 same cycle with regeneration...
View Full Document

This note was uploaded on 02/24/2012 for the course MECHANICAL 2.611 taught by Professor Davidburke during the Fall '06 term at MIT.

Page1 / 6

11rankine_regen - ⋅ ⋅ comparison of rankine with single regeneration kPa:= 10 3 ⋅ Pa MPa:= 10 6 Pa basic reference problem 3 kJ:= 10 3 ⋅ J

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online