Question 1 Seawater at 293 K is fed at the rate of 6.3 kg/s to a forward-feed triple-effect evaporator and is concentrat

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Question 1 Seawater At 293 K Is Fed At The Rate Of 6 3 Kg S To A Forward Feed Triple Effect Evaporator And Is Concentrat 1 (113.2 KiB) Viewed 12 times

Question 1 Seawater at 293 K is fed at the rate of 6.3 kg/s to a forward-feed triple-effect evaporator and is concentrated from 2% to 10%. Saturated steam at 170 kN/m² is introduced into the the first effect and a pressure of 34 kN/m² is maintained in the last effect. If the heat transfer coefficients in the three effects are 1.7, 1.4 and 1.1 kW/m² K, respectively and the specific heat capacity of the liquid is approximately 4 kJ/kg K, what area is required if each effect is identical? Condensate may be assumed to leave at the vapor temperature at each stage, and the effects of boiling point rise may be neglected. The latent heat of vaporization may be taken as constant throughout (a = 2270 kJ/kg). (kN/m² : kPa) Water vapor saturation temperature is given by tsat = 42.6776 - 3892.7/(In (p/1000) – 9.48654) - 273.15 The correlation for latent heat of water evaporation is given by à = 2501.897149 -2.407064037 t + 1.192217x10-3 t2 - 1.5863x10-5 t3 Where t is the saturation temperature in °C, p is the pressure in kPa. and 2 is the latent heat in kJ/kg. = = -