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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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4.6 STORC Conclusion Overall many issues were encountered during the analysis of a STORC. The first issue is the conflicting relationship between temperature and mass flow rate of the ORC’s. ORC’s can operate at very low temperatures because the working fluids within the cycles have very low boiling temperatures, but in order for an ORC to produce enough power to be economically feasible it has to have a large heat input or a high mass flow rate of the heating fluid. This means that using ETC’s in combination with an ORC is a poor choice because ETC’s require small mass flow rates of fluid in the collector and would require a large number of collectors to produce the required heat input for an ORC. This means that small-scale at home STORC’s are not economically feasible due to the large number of collectors required and the large amount of land required to mount all of the collectors. The same issue can be used to show that PTC’s are not an economical choice for an ORC as well. A PTC using Therminol VP-1 as the heat transfer fluid can obtain a high enough mass flow rate to use an ORC but the outlet temperature of the fluid is close to 700 0F. With this high of an outlet temperature a standard steam Rankine cycle would be more efficient and cost effective to produce power. Most working fluids used in ORC’s have a critical point lower than 700 0F which means they could not be used at this high of a temperature. Although organic fluids do exist that can operate at these temperatures they are more expensive and less used than water. Therefore it would be better to use a steam cycle. Possible applications that could support the use of a STORC that were not investigated are solar ponds and direct flash systems. Solar ponds are ponds that contain fresh water and salt 97

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