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Problem 4 An MSF brine circulation plant has the following design data: Distillate flow rate: Seawater temperature: Seawater salinity: Top brine temperature: Temperature in the
Problem 4 An MSF brine circulation plant has the following design data: Distillate flow rate: Seawater temperature: Seawater salinity: Top brine temperature: Temperature in the last stage: Temperature of heating steam: Terminal temperature difference: Number of stages: 5000 m3/d 30 C 44000 ppm 112 C 40 C 116.7 C 3C 20 The overall heat transfer coefficient in the brine heater or the flashing stages is given by the relation U = 6.5 -0.03(115-T) With U in kW/m2 oC and T in C. Calculate the following Thermodynamic losses in the first stage - Plant performance ratio - Brine heater surface area - Flow rate of feed water. Also, calculate the following parameters for stage number 5 Boiling point elevation. - Gate height Liquid level Demister temperature loss - Stage height Stage length Preheater surface area
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