The series of heat exchangers shown in Figure P5.33 is designed to raise a liquid's temperature...

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The series of heat exchangers shown in Figure P5.33 is designed to raise a liquid's temperature so a desired chemical reaction can take place in the reactor. The spe- cific heat of the liquid can be assumed constant at an average value of 3.2 kJ/kg-K. The liquid flow rate is 1.4 kg/s. The temperature of the liquid entering HX 1 is 300 K and the temperature leaving the reactor is 390 K. The UA value of HX 1 is 2.88 kW/K. Saturated vapor steam is supplied to HX 2 at 375 K and saturated liq- uid condensate leaves at 375 K. The UA values of HX 2 and HX 3 are 4.7 kW/K and 9.6 kW/K, respectively. Determine the values of the unknown temperatures (K) in the system and the heat transfer rates in each of the three heat exchangers. T₁-300 K 1 HX I wwwwww UA, -2.88 kW/K Saturated vapor steam T=375 K 2 HX 2 UA, 4.7 kW/K wwwwww T-375 K Saturated liquid steam 6 FIGURE P5.33 Heat exchangers used to control a chemical reaction. HX 3 5 - UA, 9.6 kW/K T, 390 K Reactor The series of heat exchangers shown in Figure P5.33 is designed to raise a liquid's temperature so a desired chemical reaction can take place in the reactor. The spe- cific heat of the liquid can be assumed constant at an average value of 3.2 kJ/kg-K. The liquid flow rate is 1.4 kg/s. The temperature of the liquid entering HX 1 is 300 K and the temperature leaving the reactor is 390 K. The UA value of HX 1 is 2.88 kW/K. Saturated vapor steam is supplied to HX 2 at 375 K and saturated liq- uid condensate leaves at 375 K. The UA values of HX 2 and HX 3 are 4.7 kW/K and 9.6 kW/K, respectively. Determine the values of the unknown temperatures (K) in the system and the heat transfer rates in each of the three heat exchangers. T₁-300 K 1 HX I wwwwww UA, -2.88 kW/K Saturated vapor steam T=375 K 2 HX 2 UA, 4.7 kW/K wwwwww T-375 K Saturated liquid steam 6 FIGURE P5.33 Heat exchangers used to control a chemical reaction. HX 3 5 - UA, 9.6 kW/K T, 390 K Reactor

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