A standard calandria type of evaporator with $100$ tubes, each $1$m long, is used to evaporate fruit juice at $18$oC with approximately the same thermal properties as water. The pressure in the evaporator is $80$kPa absolute$,$ and in the steam jacket l$00$kPa absolute$.$ Take the tube diameter as $5$ cm and the overall heat transfer coefficient at $440$ Jm$-2$ s$-1$ oC$-1.$ Estimate the rate of evaporation in the evaporator