'((((((   ! G?  G9  G:$' GC0$'        ! "!#" $ %&%'$ q' @@ Heat Recovery Steam  Cumulative Heat Tran Temperature,FwatergasCurrentqqq @@' Heat Recovery Steam Generator Design* Cumulative Heat Transferred, Btu/lb st. Temperature,Fwatergas'Example 9-1.='Combined cycle - Refer to fig. 9-5 and 9-6 for notation' case 1' case 2' case 3 'T7,F'HRSG exit temp., F 'T4,F@@ @@ @@ 'gas turbine exit temp.,F 'T11,F'feedwater in temp.,F 'T12,FX 'boiling temp.,F 'T12=T13,F X    'boiling temp.,F 'T8,F x x @  'throttle temp.,F 'p8=p12  (\B@ أp= 7@ 'throttle pressure, psia 'h11,Btu/lb    'feedwater in enthalpy 'h12,Btu/lb Y@ ̌@ 03333@ 'sat liq enthalpy'h13,Btu/lbhffffv @b hffffF @'sat vapor enthalpy'h8,Btu/lbhffff @hffffv @ 'throttle enthalpy 'h12-h1103333@  ̌@  03333@  'Q in economizer 'h13-h12@ y@ 83333@ 'Q in boiler 'h8-h13@@3333@̐@'Q in superheater 'h8-h11hffff& @ hffff @  @ 'Q in HRSG 'T4-T7,F@@@'HRSG temp. drop, F 'Rmass@5@hgy˰@'mgCpg/mw, Btu/lb-R 'T6,F+HH{a@ + N?@ +@ 'gas temp at pinch,F'del Tpp,F#!@YhvA@`]I@'pinchpoint temp. diff.,F'Q,Btu/lbg!0*@x $(~?!0*@x $(~?!0*@x $(~? 'HRSG heat transfer,Btu/lbg'S8,Btu/lb-Rx&1?%H +? 'throttle entropy, Btu/lb-R'h9s,Btu/lbj'isentropic exit enthalpy'Wts,Btu/lb@Y@@'isentropic turbine work'eff. turb   'steam turbine efficiency'Wst,Btu/lbsS㥙@rh@@ ףp=@ 'st. turb. work,Btu/lbsteam'eff. RankW"?3o??'Rankine cycle efficiency'Qc,Btu/lbgp= c@p= c@p= c@'combustor heat transfer 'Wgt,Btu/lbg ףp= @ ףp= @ ףp= @ 'gas turbine work!'eff. G.T.! &XM? ! &XM? ! &XM? !'gas turb. efficiency"'Wtot,Btu/lbg/"#@ x $(~?/"@ x $(~?/"37b@ x $(~?"'Wtot = Wgt+ Wst(ms/mg) #'eff,cc#8`?"# ?"#Pj~?"#'Combined cycle eff. $'T7,F$@$@$@ %'T6,F%HH{a@% N?@%@ &'T5,F#&xEG5}@#&`-"@#&DTB%@ ''T4,F'@@'@@'@@