| The rapid consumption of fossil fuel in industrial manufacture has made the wasteheat energy ubiquitous and people pay close attention to the usage of the low gradewaste heat energy. So far the supercritical organic Rankine cycle (SORC) has beenrecognized as an effective way to recycle low temperature exhaust heat but littleliterature on the study of the regenerative supercritical organic Rankine cycle (RORC)have been reported.At first, the thermodynamic cycle model for SORC is established, and the pumpingwork on the performance of this cycle is discussed under different expander inlettemperature, expander inlet pressure, condensing temperature and different workingfluids. The results show that a part of expander work is consumed by pump instead oftranslating into the net work output. Thus, the injector is applied into the optimizing ofthe supercritical organic Rankine cycle in order to decrease pump work.Based on the fundamental knowledge of the injectors, both the structure featuresand the thermodynamic properties of the injector have been thoroughly considered byusing the EES software package to implement the essential numerical calculations.The effects of the extraction pressure, expander inlet temperature, expander inletpressure and the condensing temperature on the net power output and the thermalefficiency for the RORC are studied by using the work fluid R123. The differential ofthe total exergy loss between the RORC and the SORC has also been compared.Taking the working efficiency, safety and being environmental friendly as thecriterions,8work fluids are adopted to compare the net power output, pump work andthermal efficiency between these two systems as the expander inlet temperature rangedfrom340～550K. In addition, the comparison of the total exergy loss for the RORC andthe SORC under the same work conditions has been implemented as well.The results will provide the theoretical guidance for the experimental tests and theoperation of the SORC and RORC systems. |
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