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List of Figures Figure 1.1: Diagram of a basic organic Rankine cycle............................................................................. 3 Figure 2.1: Solar thermal organic Rankine cycle modified from (Wang et al., 2010) ................ 9 Figure 2.2: Eneftech scroll expander geometry modified from (Eneftech Innovation SA, 2011) ...................................................................................................................................................................... 11 Figure 3.1: T-s diagram of R227ea .............................................................................................................. 16 Figure 3.2: System diagram for a cogeneration organic Rankine cycle ........................................ 17 Figure 3.3: T-s diagram of R227ea showing potential heat available for cogeneration applications .......................................................................................................................................................... 17 Figure 3.4: T-s diagram of a supercritical organic Rankine cycle using R227ea....................... 18 Figure 3.5: Practical and unpractical conditions for isentropic and dry working fluids........ 21 Figure 3.6: Screw expander modified from (ElectraTherm Inc, 2011) ........................................ 24 Figure 4.1: Diagram of system used in the analysis.............................................................................. 32 Figure 5.1: Illustrative example of the scroll geometry modified from (Tarique, 2011) ...... 35 Figure 5.2: Temperature-entropy diagram for R134a ........................................................................ 38 Figure 5.3: Temperature-entropy diagram for water.......................................................................... 39 Figure 5.4: Temperature-entropy diagram for R227ea ...................................................................... 40 Figure 5.5; Temperature-entropy diagram for R245fa ....................................................................... 41 Figure 5.6: Temperature-entropy diagram for toluene ...................................................................... 41 Figure 5.7: Temperature-entropy diagram for iso-butane ................................................................ 42 Figure 5.8: Temperature-entropy diagram for acetone...................................................................... 42 Figure 5.9: Temperature-entropy diagram for iso-pentane.............................................................. 43 Figure 5.10: Temperature-entropy diagram for n-pentane .............................................................. 43 Figure 5.11: Temperature-entropy diagram for dimethyl ether..................................................... 44 Figure 5.12: Scroll expander thermodynamic model diagram......................................................... 45 Figure 5.13: Possible leakages in a scroll expander modified from (Wang, et al., 2005) ...... 46 Figure 6.1: Isentropic efficiency vs. pressure ratio for R227ea ....................................................... 59 Figure 6.2: Electrical power output for R134a ....................................................................................... 61 Figure 6.3: System exergy efficiency for R134a ..................................................................................... 61 Figure 6.4: Expander isentropic efficiency for R134a ......................................................................... 62 Figure 6.5: Electrical power output for water ........................................................................................ 63 viPDF Image | Exergoeconomic Analysis and Optimization of ORC
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