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Research Papers

Performance Test of the Air-Cooled Finned-Tube Supercritical CO2 Sink Heat Exchanger

[+] Author and Article Information
Ales Vojacek

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

Vaclav Dostal

CTU in Prague,
Zikova 1903/4,
166 36 Prague 6,
Prague, Czech Republic
e-mail: Vaclav.Dostal@fs.cvut.cz

Friedrich Goettelt

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

Martin Rohde

TU Delft,
Mekelweg 15,
JB Delft 2629, The Netherlands
e-mail: M.Rohde@tudelft.nl

Tomas Melichar

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 4, 2018; final manuscript received October 2, 2018; published online February 11, 2019. Assoc. Editor: Cheng-Xian Lin.

J. Thermal Sci. Eng. Appl 11(3), 031014 (Feb 11, 2019) (11 pages) Paper No: TSEA-18-1171; doi: 10.1115/1.4041686 History: Received April 04, 2018; Revised October 02, 2018

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 Sustainable Energy (SUSEN) project at Research Centre Rez (CVR). The experimental setup 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 Gnielinski 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.

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References

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Figures

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Fig. 1

SCO2-HeRo system for a PWR

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Fig. 3

Illustrative picture of the internals of sink HX including tubes with rectangular fins [15] (Reprinted with permission of Güntner GmbH & Co. KG © 2018)

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Fig. 4

Piping and instrument diagram of the sCO2 loop with sink HX

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Fig. 5

Three-dimensional CAD model of the sCO2 loop with sink HX modification

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Fig. 6

The sink HX with measurements

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Fig. 7

Experimental results of of Q_airand QsCO2 of the sink HX

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Fig. 8

Calculated the results of overall heat transfer coefficients k_calc_avg_IPPE (using IPPE correlation) and experimentally determined k_exp_avg of the sink HX

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Fig. 9

A comparison of calculated results of overall heat transfer coefficients k_calc_avg according to IPPE and VDI

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Fig. 10

Heat transfer coefficients versus sCO2 temperature distribution along the gas coolers for different mass fluxes (psCO2=7.8 MPa, Tpc = 33.4 °C)

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Fig. 11

Heat transfer coefficients versus sCO2 temperature distribution along the gas coolers for different inlet pressures (Tpc(7.8 MPa) = 33.4 °C, Tpc(8.5 MPa) = 37.3 °C, Tpc(9.4 MPa) = 41.8 °C) at 0.2 kg/s

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Fig. 12

Numerical model of the sink HX in Modelica with resulted nominal parameters

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Fig. 13

Temperatures of the sink HX for nominal parameters

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Fig. 14

Comparison of main resulted parameters from measurement and from simulation

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