Numerična analiza vpliva izolativnih slojev na delovanje aktivnega magnetnega regeneratorja

Lukanc, Primož (author), Kitanovski, Andrej (mentor), Poredoš, Alojz (co-mentor)

V nalogi smo s pomočjo dveh numeričnih modelov raziskovali vpliv vmesnih izolativnih slojev na delovanje 7-slojnega aktivnega magnetnega regeneratorja (AMR). Najprej smo naredili numerično analizo osnovnega AMR-ja. Nato smo z namenom določitve vpliva izolativnih slojev osnovni numerični model nadgradili tako, da smo med material na točkah, kjer pride do menjave materiala, uvedli pogoje adiabatnih sten. Na ta način smo v nadgrajenem modelu numerično preprečili toplotno prevodnost med sloji trdnin AMR-ja. Na podlagi rezultatov smo modela med seboj primerjali. V primeru časa toka tekočine 1 s, ko se v AMR-ju nahajajo idealne izolativne plasti, se pri enakem razmerju prečrpane tekočine največji doseženi temperaturni razpon AMR-ja poveča s 34,2 K na 38,8 K, kar je približno 13-odstotno povečanje temperaturnega razpona glede na osnovni AMR.

• Language: Slovenian
• Keywords: magnetno hlajenje, aktivni magnetni regenerator, toplotna izolacija, prenos toplote, energijska učinkovitost
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [P. Lukanc]
• Year: 2019
• Number of pages: XXIII, 70 str.
• PID: 20.500.12556/RUL-106531
• UDC: 519.62:621.1.016.4(043.2)
• COBISS.SI-ID: 16550171
• Publication date in RUL: 02.03.2019

Secondary language

• Language: English
• Title: Numerical analysis of the influence of insulation layers on graded AMR performance

Abstract

The master thesis deals with a numerical analysis of two models of graded active magnetic regenerators. Firstly, a general graded AMR model is taken into consideration. The number of MCM layers with equal length distribution was chosen to be 7. Then, in order to determine the effect of thermal insulation layer inserts, numerical adiabatic boundary conditions were inserted in the numerical model at the points where material changes. In this way, the upgraded model prevents solid thermal conductivity between layers. The results are compared and insulation layers’ efficiency is presented. In the case of fluid flow period of 1 s, the maximum temperature span of the general AMR reaches 34,2 K, whereas the temperature span of the model with insulation inserts reaches 38,8 K, which is about 13% increase of temperature span.

• Keywords: magnetocaloric refrigeration, active magnetic regenerator, thermal insulation, heat transfer energy efficiency