Magnetno hlajenje s toplotnim stikalom

zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program

Tom Sojer (Author), Andrej Kitanovski (Mentor)

Abstract

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.

Keywords

diplomske naloge;magnetno hlajenje;magnetokalorični učinek;numerični model;parametrična analiza;toplotno stikalo;upravljanje s toploto;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[T. Sojer]
UDC:	621.56:536.2(043.2)
COBISS:	73681667
Views:	686
Downloads:	77
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Magnetic cooling using a thermal switch
Secondary 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.
Secondary keywords:	thesis;magnetic cooling;magnetocaloric effect;numerical model;parametric analysis;thermal switch;thermal management;
Type (COBISS):	Final paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XII, 36 f.
ID:	13261349