Question: 10 m3 at 25 C inside a mixed preheating tank containing a solution a coil heater is heated with Saturated steam at 130C in the

10 m3 at 25 C inside a mixed preheating tank containing a solution a coil heater is heated with Saturated steam at 130C in the heat exchanger (take as fluid temperature). Heat transfer coefficient of the heat exchanger h0A0=UA=150 kcal/min.0C. Molar heat of solution, Cv=1kcal/kg.C and density 800 kg/m3 can be taken as fixed. Heating interruption when solution temperature reaches 700C required. It will be assumed that there is no heat leakage from the mixing tank to the environment and Tlm = T will be taken. a) After how many minutes should the steam inlet be closed? b) What will be the temperature of the solution in the tank after 15 minutes?

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