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Development and Testing of Supercritical Heat Exchangers for ORC Applications

This project focuses on the design, modeling, and testing of supercritical heat exchangers within the ORCNext initiative. Led by Tom Catternan and Henk Huisuene, the work involves selecting suitable refrigerants (R125 or R134a), conducting experimental studies to determine heat transfer and pressure drop correlations, and implementing these findings into practical heat exchanger designs. The tests will be held at UGent-ATHT and HoWest, utilizing a dedicated experimental setup to validate simulations and ensure effective integration of supercritical technologies.

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Development and Testing of Supercritical Heat Exchangers for ORC Applications

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  1. ORCNext – WP4Development of supercriticaltechnologies Tom Catternan HenkHuisseune

  2. WP4 and WP5 Model, build and test SC heat exchanger

  3. Heat transfer and pressure drop correlations • Selection of refrigerant: • HX type: horizontal shell & tube or (spiral) tube-in-tube • Design method: e.g. (subcritical) method of Taborek • No appropriate heat transfer and pressure drop correlationsavailable! • Correlationswillbedeterminedthroughexperiments Easieron single tube thanon full HX

  4. Experimentalwork plan WP4 • Test setupforsupercritical heat transfer in horizontal tube (@UGent - ATHT) • Determination of heat transfer and pressure drop correlations • Design of a PoC SC heat exchangerbasedoncorrelations • Test of PoC SC heat exchanger (@HoWest) Task 4.2 Task 4.3 Implementation of PoC SC HX in ORC validation of simulations

  5. Requirements • Easy implementation of SC heat exchanger in HoWestsetup • Refrigerant R125 or R134a • High pressure (resp. 40 bar and 45 bar) • Goodinsulation

  6. Measurements • Heat supply (hot oil) • Refrigerantflowrate • Pressure in/out • Temperature in/out • Temperaturemeasurements in flowdirection (?) • Steady-state, if time alsotransient (cfr. validationtask 4.4)

  7. Original time planning

  8. Expected time planning

  9. ORCNext – WP4Development of supercriticaltechnologies Tom Catternan HenkHuisseune

  10. WP4 and WP5 Model, build and test SC heat exchanger

  11. Tasks WP4 • Task 4.1: literaturestudy, selectionrefrigerants, studythermalproperty databases • Task 4.2: study of heat transfer (correlations) • Task 4.3: build SC shell&tube HX, test, determinecorrelation (@HoWest) • Task 4.4: EES simulation of SC ORC + transientbehaviour

  12. Tasks WP5

  13. Test facility Experimental setup • Feeding pump • Pre-heater • Test-section • Cooler • Pressure gauges • Flow meter • Temperature sensors

  14. Test facility Test section • Working fluid: R125 or R134a • Uniform cross section: circular tube • Electrical uniform heat flux (DC or AC power supply) • Thermocouples

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