Some of the most common sources of heat in a chemical plant are hot water and steam. The following questions explore the value of each of these as potential heat sources:

a. Suppose that a hot water stream at 250°C is available as a heating source at a flow rate of 6.7 kg/s. How much heat can be extracted from this stream if it is cooled to 150°C? The heat capacity of water at these temperatures is approximately 4.5 kJ/kg K.
b. Suppose that saturated steam at 200°C is available as a heating source at a flow rate of 6.7 kg/s. How much heat can be extracted by condensing the steam to liquid water at the same temperature?
c. Based on your answers from (a) and (b), which of the above (hot water or steam) would you recommend as a source of heat? Why?