A shell-and-tube heat exchanger with 2-shell passes and 8-tube passes is used to heat ethyl alcohol (c=2670 J/kg K) in the tubes from 25C to 70C at a rate of 2.1 kg/s. The heating is to be done by water (c, 4190 J/kg K) that enters the shell side at 95C and leaves at 45C. If the overall heat transfer coefficient is 950 W/m K, determine the heat transfer surface area of the heat exchanger. Water 95C 70C Ethyl alcohol 25C 2.1 kg/s (8-tube passes) 45C