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research-article

Performance test of the air cooled finned-tube supercritical CO2 sink heat exchanger

[+] Author and Article Information
Ales Vojacek

Research Centre Rez, Research Centre Rez, Hlavní 130, Řež, 250 68 Husinec, Czech Republic
ales.vojacek@cvrez.cz

Vaclav Dostal

CTU in Prague, CTU in Prague, Zikova 1903/4, 166 36 Prague 6, Czech Republic
vaclav.dostal@fs.cvut.cz

Tomas Melichar

Research Centre Rez, Research Centre Rez, Hlavní 130, Řež, 250 68 Husinec, Czech Republic
tomas.melichar@cvrez.cz

Martin Rohde

TU Delft, TU Delft, Mekelweg 15, 2629 JB Delft, The Netherlands
m.rohde@tudelft.nl

Friedrich Gottelt

XRG Simulation GmbH, XRG Simulation GmbH, Harburger Schlossstraße 6-12, 21079 Hamburg, Germany
gottelt@xrg-simulation.de

1Corresponding author.

ASME doi:10.1115/1.4041686 History: Received April 04, 2018; Revised October 02, 2018

Abstract

This technical paper presents results of an air cooled supercritical CO2 (sCO2) finned-tube sink heat exchanger (HX) performance test comprising wide range of variable parameters (26-166 °C, 7-10 MPa, 0.1-0.32 kg/s). The measurement covered both supercritical and subcritical pressures including transition of pseudocritical region in the last stages of the sink HX. The test was performed in a newly built sCO2 experimental loop which was constructed within SUSEN (Sustainable Energy) project at Research Centre Rez (CVR). The experimental set-up along with the boundary conditions are described in detail, hence the gained data set can be used for benchmarking of system thermal hydraulic codes. Such benchmarking was performed on the open source Modelica-based code ClaRa. Both steady-state and transient thermal hydraulic analyses were performed using the simulation environment DYMOLA 2018 on a state of the art PC. The results of calculated averaged overall heat transfer coefficients (using Gnielinsky correlation for sCO2 and IPPE or VDI for the air) and experimentally determined values shows reasonably low error of + 25 % and - 10 %. Hence, using the correlations for the estimation of the heat transfer in the sink HX with a similar design and similar conditions gives a fair error and thus is recommended.

Copyright (c) 2018 by ASME
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