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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Table of Contents 1 Introduction.............................................................................................................................................8 2 Low Temperature Heat Recovery.............................................................................................................9 2.1 The Rankine cycle....................................................................................................................10 2.1.1 Improvements to the cycle : ...............................................................................................11 2.1.2 Real cycle : ........................................................................................................................11 2.2 The low temperature Rankine cycle : ........................................................................................11 2.2.1 Improvements of the cycle :...............................................................................................12 2.3 Low temperature Rankine cycle applications :..........................................................................13 2.4 Working fluids for the low temperature Rankine Cycle.............................................................14 2.5 Other solutions for heat recovery :.............................................................................................18 3 Description of the Rankine Cycle Test Bench........................................................................................19 3.1 Configuration of the cycle :.......................................................................................................20 3.2 Scroll expander.........................................................................................................................22 3.2.1 Leakages............................................................................................................................22 3.2.2 Conversion of the scroll compressor into an expander.......................................................23 3.2.3 Justification of the choice of the scroll expander...............................................................25 3.2.4 Pump......................................................................................................................................27 3.3 Condenser.................................................................................................................................29 3.4 Evaporator.................................................................................................................................31 3.5 Drain cock.................................................................................................................................31 3.6 Asynchronous machine..............................................................................................................31 3.7 Measurement devices................................................................................................................32 3.7.1 Thermocouples..................................................................................................................32 3.7.2 Pressure measurement........................................................................................................33 3.7.3 Torque meter......................................................................................................................33 3.7.4 Water flow meter...............................................................................................................34 3.7.5 Watt meter..........................................................................................................................34 3.7.6 Electricity counter..............................................................................................................35 3.7.7 Acquisition cards...............................................................................................................35 3.8 Coriolis flow meter...................................................................................................................36 3.8.1 General principle of the curved tube flow meter................................................................3..7 3.8.2 Working principle of the measurement device...................................................................37 3.8.3 Device characteristics........................................................................................................39 4 Description of the experiments..............................................................................................................41 4.1 First set of tests : .......................................................................................................................42 4.1.1 Configuration of the test bench : .......................................................................................42 4.1.2 Description of the tests :....................................................................................................42

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