In a large chemical plant, steam is used as a heat source in several different processes. The steam condenses in heat exchangers, and the liquid water is recycled to a boiler, which converts it back into steam. Because the liquid water streams are coming from different processes, they are at different conditions, but there is one uniform exit stream which is at P = 8 bar

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The boiler operates at steady state and has the following streams entering: 100 kg/min of saturated liquid at T = 150°C. 200 kg/min of saturated liquid at T = 180°C. 75 kg/min of saturated liquid at P = 6 bar. A. What rate of heat must be added to the boiler if the exiting steam is to be at T = 300°C? B. If the rate at which heat is added is 800,000 kJ/min, what is the temperature of the exiting steam?