Question

Liquid water enters a feedwater heater at inlet 1 with inlet condition ls 15 mpa, 40celcius at 60kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 celcius. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kpa. Select two different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot the mass flow rate in kg/s at inlet 2 for these two cases as a function of the chosen quality values

Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa, 40°C at 60 kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 °C. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kPa. Select two (2) different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot the mass flow rate in kg/s at inlet 2 for these two cases as a function of the chosen quality values. (10 MARKS] ling

Answer 1

4 Given P = 15 MPa Par} ho = 180.8*5149. WH (ov). 3 Ti - 4oc mi= Gokyls. T2 = 175°C up hf = 741.15 kg 1 kg hat 2772.7.145 lky. 2 P3 - 275 kPa hoza hf @ P3 - 1210.7 Kg/kg. To find (m2 ) cased Let X2=o.ss. h, [h . ( hạ --+ Jer. -0 : 741:15 +0.57 ( 2772.1-741.15) ha=1858.5 kJ lkg By energy balance over FWH Eina éant (No heat loss assumed) 1 ../ minit mishaa na ha= (mit mal ha 80x180.8+ m2 x 1858.5 (60+ m2 1 X 1210.7 il margs. 4 kg is And')

Case 2 let x=0.75 put in egn o to find 'ha: .. has 2264.81 Kolkg it in put 2 ean (60+ m2) x 1210.) i 60x 180.8t max 2264.81 m2=58.62 kols (am:). Plot! me vs. X2: miza (kg/s) 95.4 58.62 0.75 0.55

Please Rate,

Thank you!!!