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Showing result 1 - 5 of 58 essays matching the above criteria.

  1. 1. Numerical Modelling of a Packed Bed Thermal Energy Storage for Applications in a Carnot Battery : KTH Thesis Report

    University essay from KTH/Skolan för industriell teknik och management (ITM)

    Author : Gabriel Juul; [2023]
    Keywords : Thermal energy storage; Carnot battery; sand; packed bed; granular medium; porous medium; effective medium technique; effective thermal conductivity; paramedic study; 3D model; COMSOL; numerical modelling; Lagring av värmeenergi; Carnot-batteri; sand; packad bädd; granulärt medium; poröst medium; effektiv mediumteknik; effektiv värmeledningsförmåga; parametrisk studie; 3D-modell; COMSOL; numerisk modellering;

    Abstract : This thesis explores the heat transfer characteristics of a packed bed thermal energy storage device through the development of a 3D model in COMSOL Multiphysics. The model is based on a laboratory-scale device consisting of an aluminum box filled with sand, which acts as the thermal storage medium. READ MORE

  3. 2. Short-horizon Prediction of Indoor Temperature using Low-Order Thermal Networks : A case study of thermal models for heat-system control applications

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Jonas Cederberg; [2023]
    Keywords : Lumped Parameter Thermal Network; Resistance-Capacitance model; Parameter estimation; Modelling of Dynamical Systems; Thermal modelling; Temperature Prediction; Termiskt nätverk med klumpade parametrar; Mostånds-kapacitans modell; Parameterestimering; Modellering av dynamiska system; Termisk modellering; Temperaturprediktion.;

    Abstract : Optimizing and controlling the heating systems in buildings is one way to decrease their load on the power grid, as well as introduce load flexibility to be used in Demand Response (DR) applications. A requirement in occupied buildings is that the thermal comfort of the residents is guaranteed, making the optimization of heating systems a constrained problem with respect to indoor temperature. READ MORE

  4. 3. Optimization of comfort-related energy and thermal comfort for commuter trains : A case study of Stockholm commuter trains

    University essay from KTH/Skolan för industriell teknik och management (ITM)

    Author : Jimmy Lidén; [2023]
    Keywords : Energy efficiency; thermal comfort; commuter train; ventilation; cooling; heating; energy utilization; case study; temperature; transient; Energieffektivitet; termisk komfort; pendeltåg; ventilation; kyla; värme; energianvändning; fallstudie; temperatur; transient;

    Abstract : Today, energy efficiency is an increasingly important question in which progress is accelerating. One of the high electricity demand energy users is public transport. In addition, passenger satisfaction with thermal comfort is an important parameter. READ MORE

  5. 4. Improving the Robustness, Thermal and Noise Performance of a Radio Transmitter Fan Tray

    University essay from KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Author : Mattias Olausson; Selma Rahman; [2022]
    Keywords : Fan tray; Heat dissipation; Robustness; Radio transmitter; Noise performance; Fläktlåda; Värmeavledningsförmåga; Robusthet; Radio sändare; Ljudprestanda;

    Abstract : With the growing demand of compact radio transmitters, so do the need for silent and efficient thermal management systems. Given the restricted form-factor, ensuring robustness of a unit with a detachable fan tray imposes a challenge. READ MORE

  6. 5. Thermal-hydraulic safety analysis of the HTTU and GEMINI+ cores in TRACE

    University essay from KTH/Fysik

    Author : Eva Joosten; [2022]
    Keywords : HTGR; TRACE; Thermal-Hydraulics; Safety; Heat Transfer; HTGR; TRACE; Termisk-Hydraulik; Säkerhet; Värmeöverföring;

    Abstract : With the coming of Generation IV systems, there is a need for thermal-hydraulic codes to model such advanced reactors. Codes for High Temperature Gas-cooled Reactors (HTGRs) already exist, but often suffer from insufficient validation and little user experience. READ MORE