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The losses and productive output of the cycle can be represented graphically in an exergy diagram, in which the useful power output may be compared against the theoretical entitlement (shown in Figure 7 for an ORC heated by the exhaust stream from a GE PGT-25 gas turbine). A cycle that minimizes exergy destruction is sought. Figure 7. Exergy diagram for a PGT-25 gas turbine with ORC bottoming cycle. 1.4 Research Tasks The project consisted of four research tasks: (1) Detailed Design and Modeling of the ORC Direct Evaporator, (2) Design and Construction of Partial Prototype Direct Evaporator Test Facility, (3) Working Fluid Decomposition Chemical Analyses, and (4) Prototype Evaluation. Task 1: Detailed Design and Modeling of Direct Evaporator Task 1 involved the detailed design and modeling of the Direct Evaporator. GE performed the detailed hardware design and INL completed analyses and modeling. The GE GRC-Munich research team oversaw the detailed hardware design and were responsible for the overall design of the evaporator, architecture, sizing, materials, etc. Analyses and testing were performed to assess the flammability of the working fluid in the hot exhaust gas stream stemming from a potential leak in the evaporator. There were three milestone reports delivered as part of this task: r Direct Evaporator Leak and Flammability Concerns Milestone Report 3 – Direct Evaporator Failure Modes Effects Analysis (FMEA) and Hazards and Operability Analysis (HazOp) Study Task 2: Design and Construction of Partial Prototype Evaporator Test Facility To ensure evaporator performance, GE conducted full-temperature evaporation tests on a prototype section of the evaporator. This task consisted of conceptual design, design and build, and shakedown testing of the test facility. Task 3: Working Fluid Decomposition Chemical Analyses To ensure optimal performance and long-term reliability of the ORC, decomposition of the working fluid was quantified. This task, performed by INL, identified reaction pathways and decomposition products. A milestone report, Milestone Report 4, “Working Fluid Decomposition,” was delivered as part of this task. 7PDF Image | Final Report Modifications and Optimization of the Organic Rankine Cycle to Improve the Recovery of Waste Heat
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