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The theoretical analysis was performed for a 250 kW system. This was chosen because manufacturer’s data was available for this unit and this unit was used in a recent IAC recommendation, therefore the cycles could be compared. This assumption means that the work output from the turbine would be 250 kW. Note that the efficiencies of the turbine and the generator were neglected since this is an ideal theoretical analysis. The heat transfer rate from the waste heat to the input of the boiler was assumed to be constant and a value of 9 MMBTU/hr. This value was chosen based on a manufacturer’s recommendations that stated that the power output would be equal to the heat transfer rate, in BTU/hr, divided by about 35000 BTU/hr*kW depending on the temperature of the heat source and the mass flow rate of the fluid. From equation 2.2 it can be seen that for a 250 kW output about 9 MMBTU/hr is required. (2.2) The mass flow rate of the working fluid was also assumed to be about 28 lbm/s. This was chosen based on a manufacturer’s recommendations. It was also assumed that the heat input would be at 200 degrees Fahrenheit, since that is the maximum temperature at which an ORC using R245fa can efficiently operate. In order to calculate the specified state points within the cycle the first law of thermodynamics was applied to the system. The first law of thermodynamics in equation form is shown below in equation 2.3. (2.3) 26PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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