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Showing result 1 - 5 of 6 essays matching the above criteria.

  1. 1. A Numerical Study of Melt Pool Heat Transfer in the IVR of a PWR

    University essay from KTH/Fysik

    Author : Yuer Zhao; [2021]
    Keywords : In-vessel melt retention; corium pool; Zr oxidation ratio; melt pool convection; CFD; SST k-ω turbulence model; Smältretention i kärlet; koriumpöl; Zr-oxidationsförhållande; konvektion i en smältpöl; CFD; SST k-ω turbulensmodell;

    Abstract : This thesis aims to provide the thermal condition of melt pool convection by CFD simulation, which is important to the assessment of the invessel melt retention (IVR) strategy widely adopted in Generation III pressurized water reactors (PWRs). As a severe accident mitigation measure, the IVR strategy is realized through external cooling of the lower head of a reactor pressure vessel (RPV). READ MORE

  3. 2. Temperature analysis of fire exposed load-bearing structures of mono glazed balconies

    University essay from Luleå tekniska universitet/Byggkonstruktion och brand

    Author : Andreas Lilja; [2020]
    Keywords : CFD; FDS; FEM; TASEF; EKS; Eurocode; Simulation; Fire; Balcony; CFD; FDS; FEM; TASEF; EKS; Eurokoderna; Simulering; Brand; Balkong;

    Abstract : Previous to the now acting construction regulations EKS and Eurocode, the fire resistance of the load-bearing structures of mono glazed balconies were designed with a fire test called the SP fire 105. In 2011, when EKS replaced the previous construction regulations called Boverkets konstruktionsregler, BKR, the SP fire 105 was no longer the requirement for mono glazed balconies. READ MORE

  4. 3. The impact of fire development on design resistance of structures

    University essay from Luleå tekniska universitet/Byggkonstruktion och brand

    Author : Catrin Eberius; Kristin Fjällström; [2017]
    Keywords : Large compartments; temperature- time curves; travelling fires; simplified fire models; fire development;

    Abstract : The current design methods used to determine fire progression and temperature-time development in fire compartments today are being questioned to not give accurate results in large and complex enclosures (larger than 500 m2). The established design methods proposed by Eurocode and used by fire safety engineers today are primarily the standard temperature-time curve and the parametric temperature-time curves. READ MORE

  5. 4. The impact of horizontal projections on external fire spread - A numerical comparative study

    University essay from Lunds universitet/Avdelningen för Brandteknik

    Author : Markus Nilsson; [2016]
    Keywords : fönsterbröstning; bröstning; balkongplatta; balkong; horisontell projektion; SP Fire 105; numerical study; comparative analysis; validation study; adiabatic surface temperature; vertical fire spread; external fire spread; FDS 6.2.0; FDS; balcony; spandrel; horizontal projection; extern brandspridning; vertikal brandspridning; adiabatisk yttemperatur; valideringsstudie; jämförande analys; numerisk studie; Technology and Engineering;

    Abstract : The aim of the report was to investigate and compare the effect of horizontal projections along with different spandrel heights between the unprotected openings in the building facade. The effect was more specifically the effect on the risk level in regards to the external vertical fire spread. READ MORE

  6. 5. Wall Condensation Modelling in Convective Flow

    University essay from KTH/Kraft- och värmeteknologi

    Author : Marcus Lejon; [2013]
    Keywords : condensation; modelling; CFD; fluid mechanics; thermodynamics; reactions;

    Abstract : Modelling condensation of water vapour is important in a number of engineering applications, such as nuclear reactor containment, rocket engine nozzles and heat exchangers. The current study investigates the possibilities of modelling condensation induced by a cold surface in a flow at high velocity and temperature. READ MORE