Question 5 (Economic Estimation) (15 points) Figure D Figure A shows a heat exchanger network (HEN) consisting of heat cxchangers HX1,HX2,HX3. In the HEN network, initially stream P1 is heated from 25C to 150C using High-pressure steam (HPS) in HX1. The outlet stream from the reactor. P3 is cooled in HX2 from 250C to 150 C. using another process stream P2 that is heated trom 130C to 230C. Finally stream P3 at 150 C is cooled to 130C in HX3 using cooling water (CW) that is heated from 20C to 40C. Assume the tollowing information in addition to the values given in the Figure A. Additional information 1. For all heat exchangers, the heat transfer coefficient U=20kW/(m2C). 2. The heat exchanger cost can he approximated by the equation CHX=KA, where K=2000 and n=0.6 3. HPS cost: S190(kW-year); CW cost: $80(kW-year) 4. Capital charge factor (i)=0.23 5. Formula for Total Cost: Totalcost=(i{m=1n1(cnx)m})+{m=1n2(FCf)m} Where: Chw: total purchase cost of a heat exchanger (from Equation 2) i : capital charge factor, F: flow rate of mth utility C. cost of mth utility per unit flowrate (F) Answer the followitig questions 1-a) Calculate the surface area of HX1,HX2,HX3 1-b) Identify (T)min for HX1,HX2,HX3 1-c) Detcrmine the total annualized cost for HEN network in Figure D 1-d) Draw a Temperature-Enthalpy (T-H) diagram for HX2 Question 5 (Economic Estimation) (15 points) Figure D Figure A shows a heat exchanger network (HEN) consisting of heat cxchangers HX1,HX2,HX3. In the HEN network, initially stream P1 is heated from 25C to 150C using High-pressure steam (HPS) in HX1. The outlet stream from the reactor. P3 is cooled in HX2 from 250C to 150 C. using another process stream P2 that is heated trom 130C to 230C. Finally stream P3 at 150 C is cooled to 130C in HX3 using cooling water (CW) that is heated from 20C to 40C. Assume the tollowing information in addition to the values given in the Figure A. Additional information 1. For all heat exchangers, the heat transfer coefficient U=20kW/(m2C). 2. The heat exchanger cost can he approximated by the equation CHX=KA, where K=2000 and n=0.6 3. HPS cost: S190(kW-year); CW cost: $80(kW-year) 4. Capital charge factor (i)=0.23 5. Formula for Total Cost: Totalcost=(i{m=1n1(cnx)m})+{m=1n2(FCf)m} Where: Chw: total purchase cost of a heat exchanger (from Equation 2) i : capital charge factor, F: flow rate of mth utility C. cost of mth utility per unit flowrate (F) Answer the followitig questions 1-a) Calculate the surface area of HX1,HX2,HX3 1-b) Identify (T)min for HX1,HX2,HX3 1-c) Detcrmine the total annualized cost for HEN network in Figure D 1-d) Draw a Temperature-Enthalpy (T-H) diagram for HX2
