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study of ORC with the expansion process twin screw machines

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study of ORC with the expansion process twin screw machines ( study-orc-with-expansion-process-twin-screw-machines )

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Chapter 2 Working fluid.............................................................................................................. 32 2.1 Introduction ...................................................................................................................... 32 2.2 Desired properties ............................................................................................................ 33 2.3 Screening method ............................................................................................................. 36 2.4 R245fa ............................................................................................................................... 39 Chapter 3 Modelling (Global model) .......................................................................................... 41 3.1 Introduction ...................................................................................................................... 41 3.2 Model background ............................................................................................................ 41 3.3 Irreversibilities .................................................................................................................. 44 3.4 Assumptions for the model............................................................................................... 46 3.5 Global model..................................................................................................................... 47 Chapter 4 ORC components & modelling sub-routines.............................................................. 51 4.1 Boilers ............................................................................................................................... 51 4.1.1 Assessments of possible plate heat exchanger technologies .................................... 52 4.1.2 Findings ...................................................................................................................... 54 4.1.3 Boiler description....................................................................................................... 55 4.1.4 Boiler module............................................................................................................. 56 4.1.5 Overall heat transfer coefficient................................................................................ 60 4.2 Expander ........................................................................................................................... 63 4.2.1 Lubrication ................................................................................................................. 63 4.2.2 Benefits of twin screw expander ............................................................................... 63 4.2.3 Expander module ....................................................................................................... 64 4.3 Condensers........................................................................................................................ 66 4.3.1 Condensers types....................................................................................................... 67 4.3.2 Condenser module..................................................................................................... 70 4.4 Feed pump ........................................................................................................................ 73 4.4.1 Pump selection & pressure ........................................................................................ 73 4.4.2 Cavitation ................................................................................................................... 73 4.4.3 Pump module............................................................................................................. 74 4.5 Thermoeconomic optimization......................................................................................... 75 4.5.1 Economic analysis ...................................................................................................... 76 4.5.2 Estimation of the Total Capital Investment (TCI)....................................................... 76 4.6 Criteria of performance for ORC ....................................................................................... 78 Chapter 5 Results & discussion ................................................................................................... 80 5.1 Understanding the behaviour of an operating ORC ......................................................... 84 ii

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