Energy Balance in a Heat Exchanger

We need the mass flow rates for brine and seawater. The mass balance on the precooler is trivial because the brine and seawater flows are separated seawater enters via stream 

1 and leaves via stream 8, so Fj i = Fj g = 100 kg/min. Likewise, brine enters via stream 3 and leaves via stream 9, so Fj s = Ft,9 = 50 kg/min, from the previous analysis. Again we will assume that the heat capacity is independent of the salt contents here (3.5 wt% in streams 1 and 8, 7 wt% in streams 3 and 9) and is equal to the heat capacity of water. Equation (3.74) is transformed as follows  

The restrictions that physical laws place on creativity is a common frustration in design. Richard Feynman (1918-1988), the second-most famous physicist of the twentieth century, commented  

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