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ORCNext – WP4Development of supercritical technologies

Tom CatternanHenk Huisseune

1

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WP4 and WP5

Model, build and test SC heat exchanger

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Heat transfer and pressure drop correlations

refrigerant Tcrit (°C) Pcrit (bar)

R125 66,0 36,2

R134a 101,1 40,6

• No appropriate heat transfer and pressure drop correlations available!

• Correlations will be determined through experiments

Easier on single tube than on full HX

• Selection of refrigerant:

• HX type: horizontal shell & tube or (spiral) tube-in-tube

• Design method: e.g. (subcritical) method of Taborek

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Experimental work plan WP4

• Test setup for supercritical heat transfer in horizontal tube (@UGent - ATHT)

• Determination of heat transfer and pressure drop correlations

• Design of a PoC SC heat exchanger based on correlations

• Test of PoC SC heat exchanger (@HoWest)

Task 4.2

Task 4.3

Implementation of PoC SC HX in ORC validation of simulations

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Requirements

• Easy implementation of SC heat exchanger in HoWest setup

• Refrigerant R125 or R134a

• High pressure (resp. 40 bar and 45 bar)

• Good insulation

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Measurements

• Heat supply (hot oil)

• Refrigerant flow rate

• Pressure in/out

• Temperature in/out

• Temperature measurements in flow direction (?)

• Steady-state, if time also transient (cfr. validation task 4.4)

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Original time planning

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Expected time planning

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ORCNext – WP4Development of supercritical technologies

Tom CatternanHenk Huisseune

9

www.orcnext.be 10

WP4 and WP5

Model, build and test SC heat exchanger

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Tasks WP4

• Task 4.1: literature study, selection refrigerants, study thermal property databases

• Task 4.2: study of heat transfer (correlations)• Task 4.3: build SC shell&tube HX, test, determine correlation

(@HoWest)• Task 4.4: EES simulation of SC ORC + transient behaviour

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Tasks WP5

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Test facility

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

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Test facility

Test section• Working fluid: R125 or R134a• Uniform cross section: circular

tube• Electrical uniform heat flux (DC

or AC power supply)• Thermocouples