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From the aggregation of the boiler powers and fluegas condenser powers the DHS mass flow rate is found as m ̇ DHS = Q ̇ DHS (3.2) CPTe − CpTa 3.4 Modeling the Organic Rankine Cycle The thermodynamic state of the working fluid as it passes through the power cycle can be determ- ined using a table of fluid properties. The C++ library CoolProp with equations of state (EOS) and transport properties of 122 fluids is used (Coolprop, 2019). It is supported by Python and many other programming languages, however not by MATLAB directly. This can be solved by either running a Python program in MATLAB or by approximating the function by a polynomial and evaluating the polynomial in MATLAB. In this work the latter option is chosen. On the choice of preheating Commercial ORC systems, especially smaller systems below 10 MWel, rarely preheat the working fluid in a separate heat exchanger since it would require an additional heat exchanger, in excess of the evaporative heat exchanger. The increased thermal efficiency, and additional revenues therefrom, do not make up for the incurred costs. Therefore, a power cycle without preheating is modeled. On the choice of superheating Furthermore, the working fluids used in commercial fluids are often dry, allowing for a dry expansion phase with no, or very limited, liquid drop formation. The resulting benefit is that there is no need to superheat the fluid, which would require an additional, costly, heat exchanger. Also, for a constant temperature heat source the optimal cycle is shown to be saturated [4]; using superheating would not result in any benefits just additional costs. Evaporation temperature The evaporation temperature is limited by the temperature of the HTF (hot water) at the exit of the evaporative HX, T2, and by the TTD of the HTF and the organic working fluid. Furthermore, T2, depends on the HTF inlet temperature, T1 and mass flow rate, m ̇ 1. However, it is desirable that T2 is controlled such that it is fixed at the temperature of the mass flow returning to the FPC-HX, which is currently 145°C, year round. The boiler circuit of FPC is rated at a pressure of 10 bar, resulting in a maximum HTF saturation temperature of 179.9°C. Currently the boiler is operated such that the HTF temperature is in the range of 160-168°C. However, since the HTF will not start evaporating until it reaches the saturation temperature at the HWC pressure of 10 bar, the temperature of the HWC can be increased to a higher temperature.. Therefore, T1 is set to 42PDF Image | Analysis of Organic Rankine Cycles for a Boiler Station
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