Low-pressure steam at 160°C is used to heat very viscous oil from 30°C to 65°C in a heat exchanger located at the inlet to a pump. The amount of energy needed to heat the oil is 2.65 GJ/h. Over the temperature range of the oil, the physical and transport properties of the oil are all constant except for the viscosity, which decreases significantly as the oil is heated. Using this information, calculations show that the overall heat transfer coefficients at the oil inlet and outlet are 245 and 390 W/m³/K, respectively. For this exchanger, draw the T-Q diagram and calculate the heat transfer area required in the heat exchanger.