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{PROPOSAL 1,all pressure from low turbine, 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=1.268[bar]

eta_turbine=0.85

eta_pump=0.95

z=0.0139

y=0.165

{a is the mass balance of second CFWH}



{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}

p[3]=p_OFWH

{h[3]=enthalpy(water,p=p[3],T=T[3])}

{s[3]=entropy(water,p=p[3],T=T[3])}

h[3]=h[14]

h[14]=h[15]


{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} 

p[6] =p_b

h[6]=enthalpy(water,p=p[6],T=T[6])

s[6]=entropy(water,p=p[6],T=T[6])



h[6]=h[16]

h[16]=h[17]

{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_reheat

s_s[8]=s[7]

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

{Actual} 

 h[8]=((h_s[8]-h[7])/eta_pump)+h[7]



{point 9} 

p[9] =p_reheat

T[9]=T_max 

h[9]=enthalpy(water,p=p[9],T=T[9])

s[9]=entropy(water,p=p[9],T=T[9])


{point 10} 

p[10] =p_SECONDCFWH

s_s[10]=s[9]

h_s[10]=enthalpy(water,p=p[10],s=s_s[10])

{Actual} 

 h[10]=((h_s[10]-h[9])/eta_pump)+h[9]

s[10]=entropy(water,p=p[10],h=h[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_s[11]-h[10])/eta_pump)+h[10]

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_s[12]-h[11])/eta_pump)+h[11]

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_s[13]-h[12])/eta_pump)+h[12]

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



{mass balance of FIRSTCFWH}

(1-a-y)*(h[2])+(z)*(h[12])=(h[3])*(1-a-y)+(h[14])*(z)


{mass balance of OFWH}

(h[11])*(y)+(h[3])*(1-a-y)+(h[17])*(a)=h[4]


{mass balance of SECONDCFWH}

(h[5])+(a)*(h[10])=(h[6])+(a)*(h[16])


q_add=(h[7]-h[6])+(h[9]-h[8])


q_rej=(z)*(h[15])+(h[13])*(1-a-y-z)-(h[1])*(1-a-y)

w_net= ( (h[7]-h[6]) + (h[9]-h[8]) ) - ( (z)*(h[15]) + (h[13])*(1-a-y-z) - (h[1])*(1-a-y) )

eta_th=w_net / q_add