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{PROPOSAL 3, pressure of CFWH from high pressure, 3FWH}

p_b=150 [bar]

T_max= 500 [c]

p_reheat=30.5 [bar]

T_reheat= 500 [c]

p_c = 0.1 [bar]

p_OFWH=5.83[bar]

p_FIRSTCFWH=1.268[bar]

p_SECONDCFWH=100[bar]

eta_turbine=0.85

eta_pump=0.95

z=0.0139

y=0.165




{point 1} 

p[1]=p_c 

x[1]=0

h[1]=enthalpy(water,p=p[1],x=x[1])

s[1]=entropy(water,p=p[1],x=x[1])



{point 2} 

p[2]=p_OFWH

{isentropic}

s_s[2]=s[1]

h_s[2]=enthalpy(water,p=p[2],s=s_s[2])

{Actual} 

 h[2]=((h_s[2]-h[1])/eta_pump)+h[1]



{point 3}

{h[3]=T[16]*4.18}



{point 4}

p[4]=p_OFWH

x[4]=0

h[4]=enthalpy(water,p=p[4],x=x[4])

s[4]=entropy(water,p=p[4],x=x[4])


{point 5}

p[5]=p_b

s_s[5]=s[4]

h_s[5]=enthalpy(water,p=p[5],s=s_s[5])

{Actual} 

 h[5]=((h_s[5]-h[4])/eta_pump)+h[4]


{point 6} 

{h[6]=T[14]*4.18}


{point 7}

p[7] =p_b

T[7]=T_max 

h[7]=enthalpy(water,p=p[7],T=T[7])

s[7]=entropy(water,p=p[7],T=T[7])


{point 8}

p[8]=p_SECONDCFWH

s_s[8]=s[7]

h_s[8]=enthalpy(water,p=p[8],s=s_s[8])

{Actual} 

 h[8]=h[7]-(eta_turbine*(h[7]-h_s[8]))

s[8]=entropy(water,p=p[8],h=h[8])


{point 9} 

p[9] =p_reheat

s_s[9]=s[8]

h_s[9]=enthalpy(water,p=p[9],s=s_s[9])

{Actual} 

 h[9]=h[8]-(eta_turbine*(h[8]-h_s[9]))



{point 10} 

p[10] =p_reheat

T[10]=T_max 

h[10]=enthalpy(water,p=p[10],T=T[10])

s[10]=entropy(water,p=p[10],T=T[10])



{point 11} 

p[11] =p_OFWH

s_s[11]=s[10]

h_s[11]=enthalpy(water,p=p[11],s=s_s[11])

{Actual} 

 h[11]=h[10]-(eta_turbine*(h[10]-h_s[11]))

s[11]=entropy(water,p=p[11],h=h[11])



{point 12} 

p[12] =p_FIRSTCFWH

s_s[12]=s[11]

h_s[12]=enthalpy(water,p=p[12],s=s_s[12])

{Actual} 

 h[12]=h[11]-(eta_turbine*(h[11]-h_s[12]))

s[12]=entropy(water,p=p[12],h=h[12])


{point 13} 

p[13] =p_c

s_s[13]=s[12]

h_s[13]=enthalpy(water,p=p[13],s=s_s[13])

{Actual} 

 h[13]=h[12]-(eta_turbine*(h[12]-h_s[13]))

s[13]=entropy(water,p=p[13],h=h[13])


{point 14} 
p[14]=p_SECONDCFWH

x[14]=0

h[14]=enthalpy(water,p=p[14],x=x[14])

{T[14]=TEMPERATURE(Water,h=h[14],p=p[14])}

{point 15} 

h[15]=h[14]

{point 16} 

p[16]=p_FIRSTCFWH

x[16]=0

h[16]=enthalpy(water,p=p[16],x=x[16])
T[16]=TEMPERATURE(Water,h=h[16],p=p[16])


{point 17} 

h[17]=h[16]



{mass balance of SECONDCFWH}

(h[8])*(x)+(h[5])=(h[6])+(x)*(h[14])


{mass balance of OFWH}

(h[11])*(y) + (h[3])*(1-x-y) + (h[15])*(x) = h[4]


{mass balance of FIRSTCFWH}

(z)*(h[12])+(1-x-y)*(h[2]) = (h[16])*(z)+(h[3])*(1-x-y)



q_add=(h[7]-h[6])+((1-x)*(h[10]-h[9]))


q_rej = (1-x-y-z)*(h[13]-h[1]) + (h[17]- h[1])*(z)

w_net=q_add-q_rej

eta_th=w_net / q_add