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2.1 Theoretical Comparison: CHAPTER 2 The operating conditions of an ORC can greatly affect how efficient the cycle is. The main factors affecting the efficient operation of an ORC are the maximum temperature, the maximum pressure, the amount of heat input, and work output from the system. In order to compare how efficient a cycle operates at these different conditions the thermal efficiency can be calculated for each condition and compared. Since many operating points for these cycles exist a theoretical ORC was designed and analyzed multiple times. The cycle was analyzed for three different fluids. For each fluid, the cycle was analyzed at multiple boiler pressures within the system. For each pressure of each fluid multiple iterations were performed to analyze the cycle under different operating conditions. Several different iterations were performed for each pressure of each fluid and only one aspect of the cycle was changed each time it was analyzed. The tables below show the number of iterations and the parameters altered for each fluid and each pressure. Table 2.1, 2.2, and 2.3 are for R-245fa, R-245ca, and R-123 respectively. Tmax and P max refer to the temperature and the pressure in the boiler of the ORC.W out refers to the work output of the turbine, and m dot is the mass flow rate of the refrigerant within the cycle. The control run, iteration number 1, has the work output set to 250 kW and a mass flow rate of 27.8 lbm/min. These are considered to be the default values and are held constant except when the temperature and pressure are varied. 22PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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