ORCNext – WP4 Development of supercritical technologies Tom Catternan Henk Huisseune 1

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

Heat transfer and pressure drop correlations refrigerantT crit (°C)P crit (bar) R12566,036,2 R134a101,140,6 3 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

Experimental work plan WP4 Test setup for supercritical heat transfer in horizontal tube - 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 4 Task 4.2 Task 4.3 Implementation of PoC SC HX in ORC validation of simulations

Requirements Easy implementation of SC heat exchanger in HoWest setup Refrigerant R125 or R134a High pressure (resp. 40 bar and 45 bar) Good insulation 5

Measurements Heat supply (hot oil) Refrigerant flow rate Pressure in/out Temperature in/out Temperature measurements in flow direction (?) 6 Steady-state, if time also transient (cfr. validation task 4.4)

Original time planning 7

Expected time planning 8

ORCNext – WP4 Development of supercritical technologies Tom Catternan Henk Huisseune 9

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

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 Task 4.4: EES simulation of SC ORC + transient behaviour 11

Tasks WP5 12

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

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