A shell-and-tube heat exchanger with 2 shell passes and 8 tube passes is used to heat ethyl alcohol (cp = 2670 J/kg·K) in the tubes from 25°C to 70°C at a rate of 2.1 kg/s. The heating is to be done by water (cp = 4190 J/kg·K) that enters the shell side at 95°C and leaves at 45°C. If the overall heat transfer coefficient is 950 W/m²·K, determine the heat transfer surface area of the heat exchanger.