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Subcooled critical heat flux: an assessment of the risk to front-end and beamline components of synchrotron light sources

  • B. Brajuskovic (a1), D. Capatina (a1), J. Collins (a1), P. Den Hartog (a1) and J. Reneker (a2)...

Abstract

X-ray absorbers in the front ends and beamlines of synchrotron light sources are exposed to very high thermal loads. Many facilities, such as the Advanced Photon Source, are investigating upgrades that will further increase the thermal load. The likelihood of exceeding the limit of subcooled critical heat flux (CHF) in these components was examined. The assessment was performed for both currently possible off-normal operational conditions, such as might occur in the event of a failure of multiple safety interlocks, and the anticipated operating conditions that may result from future upgrades. The subcooled CHF values were calculated using empirical equations frequently cited in the literature and then compared with the computed values of the heat flux at the walls of the component cooling channels in cases where the cooling wall temperature exceeded the water saturation temperature at local hydraulic conditions. Having in mind that the great majority of the available empirical correlations were developed for the conditions characteristic for the operation of heat exchangers in the nuclear power industry, the limitations of this approach are discussed and an experimental study of the subcooled CHF values in the conditions similar to those expected in the front-end and beamline components is proposed.

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Corresponding author

Email address for correspondence:bran@aps.anl.gov

References

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Brajuskovic, B. Assesment of likelihood of critical heat flux occurrence in front end and beamline components at APS. APS Light Notes, to be published.
Groeneveld, D. C., Shan, J. Q., Vasic, A. Z., Leung, L. K. H., Durmayaz, A., Yang, J., Cheng, S. C., & Tanase, A., 2007 The 2006 CHF look-up table. Nucl. Engng Des., 237, 19091922.
Hall, D. D. & Mudawar, I. 2000a Critical heat flux (CHF) for water flow in tubes – I. Compilation and assessment of world CHF data. Intl J. Heat Mass Transf. 43, 25732604.
Hall, D. D. & Mudawar, I. 2000b Critical heat flux (CHF) for water flow in tubes – II. Subcooled CHF correlations. Intl J. Heat Mass Transf., 43, 26052640.

Subcooled critical heat flux: an assessment of the risk to front-end and beamline components of synchrotron light sources

  • B. Brajuskovic (a1), D. Capatina (a1), J. Collins (a1), P. Den Hartog (a1) and J. Reneker (a2)...

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