19.27 Water, at 60F, enters a 1-in.-ID tube that is used to cool a nuclear reactor. The water flow rate is 30 gal/min. Determine the total heat transfer and the exiting water temperature for a 15-ft-long tube if the tube surface temperature is a constant value of 300F. Compare the answer obtained using the Reynolds and Colburn analogies. 19.28 Work Problem 19.27 for the case in which the flowing fluid is air at 15 fps.