Problem:

Heat exchanger has a cold fluid contain a mixture of gases have mole fractions as follows 0.2 ethanol, 0.6 water, 0.15 ethylene and 0.05 ethane. the inlet temperature of this cold fluid equals to = - 97.97 C and the outlet temperature = 122.6 C. The Cp of the mixture is 3.41 kJ/kg.k. the flow rate of the cold fluid is 869.4 kmol/h.

The hot fluid used is water and it is entering at the atmospheric pressure and inlet temperature is equal to 200 C.

1) write your assumptions

2) Calculate the outlet temperature and the flow rate of the cold fluid with iteration solution and make sure of it by the LMTD and NTU methods.

3) calculate the qmax

4) find the efficiency of the heat exchanger

5) Calculate the heat transfer coefficient