MEDSI2020 - List of Authors (Hernández, F.)

Paper	Title	Page
TUPB05	Investigation of Thermal Instabilities in the ALBA Cooling System, Based on Numerical Simulations and Experimental Measurements	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.
	Slides TUPB05 [2.933 MB]
	Poster TUPB05 [2.401 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPB05
About •	paper received ※ 22 July 2021 paper accepted ※ 05 November 2021 issue date ※ 09 November 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Investigation of Thermal Instabilities in the ALBA Cooling System, Based on Numerical Simulations and Experimental Measurements

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.

Slides TUPB05 [2.933 MB]

Poster TUPB05 [2.401 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPB05

About •

paper received ※ 22 July 2021 paper accepted ※ 05 November 2021 issue date ※ 09 November 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)