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TUPB05 Investigation of Thermal Instabilities in the ALBA Cooling System, Based on Numerical Simulations and Experimental Measurements simulation, experiment, operation, synchrotron 153
  • F. Hernández
    ESEIAAT, Terrassa, Spain
  • E. Ayas, J.J. Casas, C. Colldelram, Ll. Fuentes, J. Iglesias, M. Quispe
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  This paper presents an investigation into the thermal instability problems that currently affect the ALBA Cooling System. During these periods of instabilities, which occur for a few hours every week of operation, there are deviations up to +1.5 °C, concerning the nominal temperature of 23 ± 0.2 °C in the four rings of ALBA: Service Area, Booster, Storage and Experimental Hall. This problem has a direct impact on the quality of the beam of the Accelerator. Previous studies have preliminarily concluded that the causes of this problem are due to (1) thermohydraulic anomalies in the operation of the external cogeneration plant, which supplies cold water to ALBA, and (2) cavitation problems in the pumping system (the water mass flow has been reduced to 67% of its nominal value to temporarily mitigate the cavitation). In order to confirm these hypotheses and propose solutions to the problem, an investigation has been developed making use of one-dimensional thermohydraulic simulations, performing Computational Fluid Dynamic (CFD) studies, statistical evaluations of data taken from our control system, and systematic flow measurements in critical areas, with ultrasonic flowmeters. As a result of this research, a set of solutions and recommendations are finally proposed to solve this problem.  
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poster icon Poster TUPB05 [2.401 MB]  
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About • paper received ※ 22 July 2021       paper accepted ※ 05 November 2021       issue date ※ 09 November 2021  
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