Razvoj poenostavljenega modela sezonskega hranilnika toplote

Tomše, Matija (author), Klinar, Katja (mentor), Kitanovski, Andrej (comentor)

Sezonski hranilniki toplote predstavljajo učinkovit in dolgoročen način shranjevanja toplotne energije v medij, ki je v večini primerov voda. Namen naloge je bil razvoj poenostavljenega termo-hidravličnega modela sezonskega hranilnika toplote v programskem okolju Python. Numerični model hranilnika toplote smo zasnovali na osnovi že obstoječih modelov toplotnih hranilnikov in ga z določenimi predpostavkami poenostavili v obliko, ki zmanjša matematično kompleksnost in računski čas. Razvit model omogoča analizo hranilnikov v obliki valja in dopušča uporabo do treh odvodov oz. dovodov, ki se nahajajo na vrhu, dnu in v volumetrični sredini hranilnika. Validacijo modela smo izvedli za osnovne načine delovanja hranilnika toplote, ki so polnjenje, praznjenje in stanje pripravljenosti. S podatki meritev sezonskega hranilnika toplote, ki je del sončne toplarne v Dronninglundu na Danskem, smo validirali tudi dinamični način delovanja hranilnika. Z modelom smo nato izvedli parametrično analizo delovanja hranilnika toplote v manjšem sistemu daljinskega ogrevanja, v katerem se je hranilnik polnil preko sončnih kolektorjev in zagotavljal potrebe po toploti stanovanjskega bloka.

• Language: Slovenian
• Keywords: hranilnik toplote, numerični model, prenos toplote, toplota, izgube, toplotne potrebe, validacija
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Tomše]
• Year: 2024
• Number of pages: XX, 63 str.
• PID: 20.500.12556/RUL-158745
• UDC: 536:519.61:621.22(043.2)
• COBISS.SI-ID: 202793731
• Publication date in RUL: 20.06.2024

TOMŠE, Matija, 2024, Razvoj poenostavljenega modela sezonskega hranilnika toplote [online]. Master’s thesis. Ljubljana : M. Tomše. [Accessed 5 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=158745

Secondary language

• Language: English
• Title: Development of a simplified model of a seasonal thermal storage

Abstract

Seasonal thermal storage systems represent an efficient and long-term method for storing thermal energy in a medium, which is usually water. The aim of this thesis was to develop a simplified thermo-hydraulic model of a seasonal thermal storage system in the Python programming environment. We designed the numerical model of the thermal storage system based on existing models and simplified it with certain assumptions to reduce mathematical complexity and computational time. The developed model allows for the analysis of cylindrical storage tanks and permits the use of up to three inlets or outlets, located at the top, bottom, and volumetric center of the storage tank. We validated the model for the basic operational modes of the thermal storage system: charging, discharging, and standby. With the help of measurement data from a seasonal thermal storage system that is part of the solar thermal plant in Dronninglund, Denmark, we also validated the dynamic operation mode of the storage tank. Subsequently, we performed a parametric analysis of the thermal storage tank's operation in a smaller district heating system, where the storage tank was charged via solar collectors and supplied the heat demand of a residential building.

• Keywords: thermal storage, numerical model, heat transfer, heat, losses, heat demand, validation