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Adaptive Cooling Water Control for Sterilizers
Halmstad University, School of Information Technology. Halmstad University.
Halmstad University, School of Information Technology. Halmstad University.
2023 (English)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This thesis was conducted with the objective of reducing water consumption byoptimizing the cooling systems of steam sterilizers. As water is a precious resourcewith great environmental effects, it is important not to waste it. Consequently, thereis a need for a more resource-efficient cooling water system. The project focuses onthe development of a system that more efficiently regulates the cooling water utilization by optimizing temperatures. The goal of the project is to achieve a 20% reduction in water consumption of the GSS-91413 model steam sterilizer manufacturedby Getinge. In order to achieve the goal, changes were made to the cooling systemand control logic of the cooling system. By integrating a proportional valve at theoutlet of the cooling system, the system was pressurized with the coolant resultingin greater energy transfer between the condensate and the coolant. The developedcontrol logic incorporates process data combined with an equation-based approachthat utilizes temperature data to adjust the proportional valve leading to increasedcontrol of the flow of the coolant. As a result, the overall water consumption of thesystem was reduced by more than 50% while the maximal temperature of the systemdid not rise more than 1.5%.

Abstract [sv]

Detta examensarbete genomfördes med målet att minska vattenförbrukningen genom att optimera kylsystemen i autoklaver. Eftersom vatten är en värdefull resursmed stora miljöeffekter är det viktigt att den inte slösas. Följaktligen finns ett behovav ett mer resurseffektivt kylvattensystem. Projektet fokuserar på utveckling av ettsystem som mer effektivt reglerar kylvattenutnyttjandet genom att optimera temperaturer. Målet med projektet är att uppnå en 20-procentig minskning av vattenförbrukningen för autoklavmodellen GSS-91413 tillverkad av Getinge. För att nå måletgjordes ändringar i kylsystemet och i kylsystemets styrlogik. Genom att integrera enproportionell ventil vid utloppet av kylsystemet trycksattes systemet med kylvätskanvilket resulterade i större energiöverföring mellan kondensatet och kylvätskan. Denutvecklade styrlogiken inkorporerar processdata kombinerat med ett ekvationsbaserat tillvägagångssätt som använder temperaturdata för att justera proportionalventilen vilket leder till ökad kontroll av kylvätskans flöde. Som ett resultat minskade dentotala vattenförbrukningen i systemet med mer än 50% medan systemets maximalatemperatur inte steg mer än 1.5%.

Place, publisher, year, edition, pages
2023. , p. 37
Keywords [en]
Autoclave, Sterilizer, Control, Control System, GSS-91413, Getinge Sterilization AB, Cooling System, Adaptive Control
Keywords [sv]
Autoklav, Kylsystem, Adaptiv Kontroll, Reglerteknik
National Category
Control Engineering Other Engineering and Technologies Software Engineering Computer Engineering Algebra and Logic Mathematical Analysis Applied Mechanics
Identifiers
URN: urn:nbn:se:hh:diva-50886OAI: oai:DiVA.org:hh-50886DiVA, id: diva2:1771868
External cooperation
Getinge Sterilization AB
Educational program
Mechatronic Engineer, 180 credits
Supervisors
Examiners
Available from: 2023-06-04 Created: 2023-06-21 Last updated: 2025-10-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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