Magnetno hlajenje s toplotnim stikalom

Sojer, Tom (author), Kitanovski, Andrej (mentor)

Magnetno hlajenje je alternativa parno kompresijskemu hlajenju. Izkorišča magnetokalorični učinek pri katerem se temperatura v magnetokaloričnemu materialu spreminja z zunanjim magnetnim poljem. Prenos toplote iz materiala se lahko izkorišča s toplotnimi stikali. S postavitvijo numeričnega modela in izvajanjem simulacij smo optimizirali magnetno hladilno napravo z nanofluidnima toplotnima stikaloma. Stikalu se toplotna prevodnost spreminja v odvisnosti od električnega polja. Naredili smo obsežen pregled literature in glede na našo aplikacijo izbrali najbolj ustrezen nanofluid. Reševanja numeričnega problema prenosa toplote sklopljenega z magnetokaloričnim učinkom smo se lotili z metodo končnih razlik, za izvajanje simulacij pa smo uporabili programsko opremo Wolfram Mathematica. Opazovali smo delovanje modela glede na podane parametre in iz rezultatov izbrali hladilno napravo, ki je dosegla največjo temperaturno razliko med izvorom in ponorom toplote. Predstavili smo dimenzije naprave in frekvenčno območje, v katerem deluje, ter našli razloge za optimalno delovanje.

• Language: Slovenian
• Keywords: magnetno hlajenje, magnetokalorični učinek, numerični model, parametrična analiza, toplotno stikalo, upravljanje s toploto
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Sojer]
• Year: 2021
• Number of pages: XII, 36 str.
• PID: 20.500.12556/RUL-128977
• UDC: 621.56:536.2(043.2)
• COBISS.SI-ID: 73681667
• Publication date in RUL: 20.08.2021

SOJER, Tom, 2021, Magnetno hlajenje s toplotnim stikalom [online]. Bachelor’s thesis. Ljubljana : T. Sojer. [Accessed 6 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=128977

Secondary language

• Language: English
• Title: Magnetic cooling using a thermal switch

Abstract

Magnetic cooling is an alternative to the vapor compression cooling. It uses the magnetocaloric effect by which the temperature of a magnetocaloric material changes with an external magnetic field. Heat transfer from the material can be utilized with heat switches. We optimized a magnetic cooling device with two nanofluidic thermal switches through developing a numerical model and executing simulations. Thermal conductivity of the nanofluidic thermal switch changes while switching the electric field. We made an extensive overview of existing literature and based on our application chose the most appropriate nanofluid. We tackled the numerical problem of heat transfer linked with the magnetocaloric effect with the finite difference method and used the software system Wolfram Mathematica to execute simulations. We observed the model response based on set parameters and from the results selected the cooling device which produced the biggest temperature difference between the heat source and heat sink. We presented the device dimensions, the operating frequency domain and found causes for the optimal device operation.

• Keywords: magnetic cooling, magnetocaloric effect, numerical model, parametric analysis, thermal switch, thermal management