Glycerin (cp 5 2400 J/kg?K) at 208C and 0.5 kg/s is to
be heated by ethylene glycol (cp 5 2500 J/kg?K) at 608C in a
thin-walled double-pipe parallel-flow heat exchanger. The temperature
difference between the two fluids is 158C at the outlet
of the heat exchanger. If the overall heat transfer coefficient
is 240 W/m2?K and the heat transfer surface area is 3.2 m2, determine
(a) the rate of heat transfer, (b) the outlet temperature of
the glycerin, and (c) the mass flow rate of the ethylene glycol.