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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
www.orcnext.be
ORCNext – WP4Development of supercritical technologies
Tom CatternanHenk Huisseune
9
www.orcnext.be 10
WP4 and WP5
Model, build and test SC heat exchanger
www.orcnext.be 11
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