A shell-and-tube process heater is to be selected to heat water (c p = 4190 J/kg

Question:

A shell-and-tube process heater is to be selected to heat water (c_p = 4190 J/kg · K) from 20°C to 90°C by steam flowing on the shell side. The heat transfer load of the heater is 600 kW. If the inner diameter of the tubes is 1 cm and the velocity of water is not to exceed 3 m/s, determine how many tubes need to be used in the heat exchanger. Steam 90C 20C Water