NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.

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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications. ( nester-ryan-timothy-organic-rankine-cycles-comparative-study )

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4.5 PTC STORC Analysis The next type of STORC investigated was a large-scale system that uses parabolic trough collectors to heat an organic fluid, Therminol VP-1. The system then uses this hot fluid as the heat input to an ORC. The system was first analyzed without a thermal storage medium in order to investigate the increase in capacity factor with the addition of thermal storage. Although this was never completed because the project was determined to be economically unfeasible before the thermal storage was analyzed. The project was deemed unfeasible because the outlet temperature of the collectors was calculated to be about 700 0F. Common working fluids in ORC’s are not applicable choices for this cycle because 700 0F is greater than the critical temperature for most of these fluids. Due to the very high outlet temperature a standard steam Rankine cycle would be more feasible to use. This makes sense since most of the SEGS (Solar Electric Generated Steam) plants that are already operational use a standard steam Rankine cycle. The analysis below describes how this outlet temperature was calculated. The method to analyze concentrating collectors was the same method that is outlined in chapter 3 of [Kalogirou, 2009]. Two types of analysis were performed on the PTC system. The first was an optical analysis that determines the physical characteristics of the PTC. This determines the length and size of the parabolic troughs as well as the optical efficiency. The second analysis performed is a thermal analysis that determines the temperatures of the fluid in the collector, the amount of solar radiation that is absorbed, and the collector efficiency. The optical analysis begins by defining physical parameters that are essential to the operating 92

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