Glycerin (c 2400 j/kg-k) at 20°c and 0.5 kg/s is to be heated by ethylene glycol (c 2500 j/kg-k) at 60°c in a thin-walled double-pipe parallel-flow heat exchanger. the temperature difference between the two fluids is 15°c 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