Differential Energy Balance
In the batch preparation of an aqueous solution, the water is first heated to 80 °C in a jacketed, agitated vessel; 1000 Imp. gal. (4545 kg) is heated from 15 °C. If the jacket area is 300 ft2 (27.9 m2) and the overall heat transfer coefficient can be taken as 50 Btu ft-2 h-1 °F-1 (285 W m-2 K-1), estimate the heating time. Steam is supplied at 25 psig (2.7 bar).