Analysis of the temperature evolution of the canned motor with spiral tube heat exchanger in secondary water supply blackout fault

Analysis of the temperature evolution of the canned motor with spiral tube heat exchanger in secondary water supply blackout fault | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Analysis of the temperature evolution of the canned motor with spiral tube heat exchanger in secondary water supply blackout fault Li-Kun Ai, Yi-Ping Lu This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5768009/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract In a canned motor with a spiral tube heat exchanger for a nuclear main pump, if the secondary cooling water suddenly fails, the temperature of the lubricating water and motor winding insulation must not exceed the alarm or permitted value (95°C or 200°C) within the 5-minute response time for safe operation. Therefore, it is crucial to predict the transient characteristics of the temperature distribution of the cooling water and the main components. In this paper, a finite-volume conjugate 3D thermal model is proposed to predict the steady-state/unsteady temperature fields of the small-capacity canned motor for a nuclear main pump. The temperature development characteristics of the main components and the primary / secondary water are analyzed under rated conditions with cold ambient parameters (CAP) in the event of a secondary water supply blackout (SWSB) failure. The predicted temperatures agree well with the measured experimental data a maximum error of + 5.97%, and the maximum measured temperature rise of the stator winding insulation is 1.24 ° C in 310 s. Results show that the temperature difference between the stator/rotor cores and the shielding sleeves becomes smaller than in the steady state and its value at 310 s is not greater than 3°C. The temperature of the coolant in the nuclear main pump under the motor bottom has an increasing influence on the motor bottom lubricating water temperature over time during transient SWSB failure conditions. It provides a reference for the thermal design of canned motors for nuclear main pumps. canned motor conjugate heat transfer secondary water supply blackout transient simulation lubrication water temperature fault conditions Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5768009","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":398958715,"identity":"39eac1c7-4f06-4b5a-b92b-c5a579afa29a","order_by":0,"name":"Li-Kun Ai","email":"","orcid":"","institution":"Qiqihar University","correspondingAuthor":false,"prefix":"","firstName":"Li-Kun","middleName":"","lastName":"Ai","suffix":""},{"id":398958716,"identity":"162a833f-a94f-4993-87fa-2926ca619560","order_by":1,"name":"Yi-Ping Lu","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA5UlEQVRIie3PsQqCQBjA8S8Cbbi69SToGT4RastXKQQnh3sEJ1tyd+khIojG4oaWHkCoQQic3JqEGzrF1ssx6P7goXI/7jsAk+kHm6jnDAhAGVjdv5WeWB/iZO079iNtmPcmLHIF54/l4Z6WTyIlUDtCqE9agiLDMjg+rgtvnCA42woH6e0LISiCeR5a03GMasIIh4OkB/EyRYhE8PuSJbKGWOoU9o2Qkqu7iBXLQ9vdJR5ht5JfUg2hdnB4cSl8qgYrKjmb0U2wL2oNARjhUK3ruPskzXLWAQC7aIiv32QymUx/3Rv0REpvA57tkQAAAABJRU5ErkJggg==","orcid":"","institution":"","correspondingAuthor":true,"prefix":"","firstName":"Yi-Ping","middleName":"","lastName":"Lu","suffix":""}],"badges":[],"createdAt":"2025-01-05 13:38:04","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-5768009/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-5768009/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":76619518,"identity":"10ff8110-442b-402d-966e-aeccdfb4d8e7","added_by":"auto","created_at":"2025-02-19 04:16:38","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":622099,"visible":true,"origin":"","legend":"","description":"","filename":"manuscripter.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5768009/v1_covered_7d1c7410-4097-49e0-892a-c6d05ee32c2d.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Analysis of the temperature evolution of the canned motor with spiral tube heat exchanger in secondary water supply blackout fault","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"canned motor, conjugate heat transfer, secondary water supply blackout, transient simulation, lubrication water temperature, fault conditions","lastPublishedDoi":"10.21203/rs.3.rs-5768009/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5768009/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eIn a canned motor with a spiral tube heat exchanger for a nuclear main pump, if the secondary cooling water suddenly fails, the temperature of the lubricating water and motor winding insulation must not exceed the alarm or permitted value (95\u0026deg;C or 200\u0026deg;C) within the 5-minute response time for safe operation. Therefore, it is crucial to predict the transient characteristics of the temperature distribution of the cooling water and the main components. In this paper, a finite-volume conjugate 3D thermal model is proposed to predict the steady-state/unsteady temperature fields of the small-capacity canned motor for a nuclear main pump. The temperature development characteristics of the main components and the primary / secondary water are analyzed under rated conditions with cold ambient parameters (CAP) in the event of a secondary water supply blackout (SWSB) failure. The predicted temperatures agree well with the measured experimental data a maximum error of +\u0026thinsp;5.97%, and the maximum measured temperature rise of the stator winding insulation is 1.24 \u0026deg; C in 310 s. Results show that the temperature difference between the stator/rotor cores and the shielding sleeves becomes smaller than in the steady state and its value at 310 s is not greater than 3\u0026deg;C. The temperature of the coolant in the nuclear main pump under the motor bottom has an increasing influence on the motor bottom lubricating water temperature over time during transient SWSB failure conditions. It provides a reference for the thermal design of canned motors for nuclear main pumps.\u003c/p\u003e","manuscriptTitle":"Analysis of the temperature evolution of the canned motor with spiral tube heat exchanger in secondary water supply blackout fault","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-01-09 16:07:10","doi":"10.21203/rs.3.rs-5768009/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"0653f8da-5843-4f9e-97b5-66ddee5a9ac4","owner":[],"postedDate":"January 9th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-02-27T11:38:42+00:00","versionOfRecord":[],"versionCreatedAt":"2025-01-09 16:07:10","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-5768009","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-5768009","identity":"rs-5768009","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}