An electrical power plant has stack gases exhausting at 150 An electrical power

Question

An electrical power plant has stack gases exhausting at 150

An electrical power plant has stack gases exhausting at 150 degree C. Design a basic Rankine cycle that uses water, refrigerant-134a or ammonia as the working fluid and that produces the maximum amount of work from this energy source, while rejecting heat to the ambient air at 40 degree C. Use a turbine whose efficiency is 92% and whose exit quality is limited to 85%. I understand how a Rankine Cycle works, but I am not sure where to place the given temperatures (40 and 150). Is the exhaust temperature the temperature of the working fluid? If not, what would be a reasonable assumption to make for the temperature of the working fluid leaving the boiler?

Explanation / Answer

The data is not sufficient to design a basic rankine cycle. The data which is provided above just gives the heat input into the system i.e in boiler.

A boiler is a type of heat exchanger where heat is exchanged from one quantity to other. The temperatures 150 C and 40 C are respective inlet and outlet temperatures of the boiler. These stack gases are used to heat the working fluid which may be water or refrigerant-134A or ammonia. And inorder to caluclate the heat input, the specific heat of stack gases and mass flow rate of the gas is to be given. And inital condition of the working fluid should also be given inorder to determine the work produced from turbine.

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