Discuss the below:
Q: Refrigerant -134 a is being transported at 0.1 kg/s through a Teflon tube of inside diameter D; = 25 mm and outside diameter Do = 28 mm, while atmospheric air at V = 25 m/s and 300 K is in cross flow over the tube. What is the heat transfer per unit length of tube to Refrigerant-134a at 240 K?