A double tube counterflow heat exchanger is used to cool a hot liquid stream of biodiesel from 60C to 35C. Biodiesel flows on the annular section side with a volumetric flow rate of 3 m3/h, water is used on the tube side. The inlet and outlet temperatures for the cooling water flow are 10C and 30C. respectively. The inner tube is 1.5-inch schedule 80 copper material. In independent experiments, it will be found that the heat transfer coefficient for biodiesel on the annular section side was 340 W/m2.K Calculator: a) How is the heat transfer guaranteed in the given problem? b) What is the heat load on the heat exchanger? c) What is the mass velocity of cooling water required? d) What is the required surface area of the heat exchanger?

Nu=1+12.72f[3Npr21]2f(Nre1000)Nprf=0.25(1.82logi0Nre1.64)2 Nu=khDNre=mDvrNpr=kCpm