scholarly journals Review of Multi-Physics Modeling on the Active Magnetic Regenerative Refrigeration

2021 ◽  
Vol 26 (2) ◽  
pp. 47
Author(s):  
Julien Eustache ◽  
Antony Plait ◽  
Frédéric Dubas ◽  
Raynal Glises
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
Room Temperature ◽  
State Of The Art ◽  
Vapor Compression ◽  
Crucial Step ◽  
Potential Alternative ◽  
Vapor Compression Refrigeration ◽  
Preliminary Study ◽  
Physics Modeling

Compared to conventional vapor-compression refrigeration systems, magnetic refrigeration is a promising and potential alternative technology. The magnetocaloric effect (MCE) is used to produce heat and cold sources through a magnetocaloric material (MCM). The material is submitted to a magnetic field with active magnetic regenerative refrigeration (AMRR) cycles. Initially, this effect was widely used for cryogenic applications to achieve very low temperatures. However, this technology must be improved to replace vapor-compression devices operating around room temperature. Therefore, over the last 30 years, a lot of studies have been done to obtain more efficient devices. Thus, the modeling is a crucial step to perform a preliminary study and optimization. In this paper, after a large introduction on MCE research, a state-of-the-art of multi-physics modeling on the AMRR cycle modeling is made. To end this paper, a suggestion of innovative and advanced modeling solutions to study magnetocaloric regenerator is described.

A State-of-the-Art Review of Compact Vapor Compression Refrigeration Systems and Their Applications

2012 ◽  
Vol 33 (4-5) ◽  
pp. 356-374 ◽  
Author(s):  
Jader R. Barbosa ◽  
Guilherme B. Ribeiro ◽  
Pablo A. de Oliveira
Keyword(s):  
State Of The Art ◽  
Vapor Compression ◽  
Vapor Compression Refrigeration

scholarly journals A Review on Magneto-Caloric Materials for Room Temperature Refrigeration

2020 ◽  
Vol 17 (1) ◽  
pp. 7805-7815
Author(s):  
S. M. Gombi ◽  
D. Sahu
Keyword(s):  
Room Temperature ◽  
Solid Material ◽  
Magnetic Refrigeration ◽  
Vapor Compression ◽  
Environment Friendly ◽  
Gas Compression ◽  
Caloric Effect ◽  
Vapor Compression Refrigeration ◽  
Room Temperature Magnetic Refrigeration ◽  
Selection Of

Magnetic Refrigeration is an environment-friendly technology when compared to the conventional gas compression system known as vapor compression refrigeration system. Room temperature magnetic refrigeration is a technology which relies on a solid material known as the Magneto-Caloric Material (MCM) which exhibits Magneto-Caloric Effect (MCE) near room temperature. The Magneto-Caloric Effect is the change in temperature of a magnetic material when that material is either magnetized/demagnetized adiabatically. This review is focused on the selection of a suitable MCM which exhibits near-room-temperature MCE. It also explains a methodology to estimate the amount of material required, based on the cooling load or refrigeration capacity (RC) calculation

Martensite-austenite and Ferromagnetic-paramagnetic Transformations in Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler Alloys

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Mihail-Liviu Craus ◽  
Viorel Dobrea ◽  
Mihai Lozovan
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Martensitic Transformation ◽  
Low Temperatures ◽  
Room Temperature ◽  
Heusler Alloys ◽  
Partial Substitution ◽  
Martensitic Transition ◽  
Cscl Type ◽  
Curie Temperatures

Ni2MnGa Heusler alloy is known as a potential smart material. At room temperature it has a L21 type structure, undergoing a martensitic transition (TM) at low temperatures. Some authors have classified Ni-Mn-Ga Heusler alloys on the values of martensitic transformation and Curie temperatures: first group formed by alloys with TM below room temperature and TC, second group with TM around room temperature and third group with TM]TC. The partial substitution of Ni with Mn leads to an increase of the transition temperature and a decrease of the Curie temperature. The Ni2-xMn1+xGa alloys have a complex tetragonal structure at room temperature. The substitution of Ga with Al can change the crystalline and magnetic structure of Heusler alloys: Ni2MnAl is antiferromagnetic for a B2 (CsCl type, with Mn and Al randomly distributed in the center of the cube) structure and ferromagnetic for a L21 (BiF3 type with Mn and Al ordered distributed in the cube center) structure. We intend to put in evidence a dependence between the applied magnetic field on a side, and the transition temperature, on other side, for the Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler alloys.

TEMPERATURE AND FIELD DEPENDENT MÖSSBAUER STUDY OF CeSn3andCeSn3.1 CRYSTALS

2009 ◽  
Vol 23 (02) ◽  
pp. 265-273
Author(s):  
R. K. SINGHAL ◽  
D. R. SÁNCHEZ ◽  
ELISA SAITOVITCH ◽  
S. K. GAUR ◽  
K. B. GARG
Keyword(s):  
Magnetic Field ◽  
Hyperfine Field ◽  
Low Temperatures ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Mössbauer Study ◽  
Cubic Crystal ◽  
Temperature Range ◽  
Negative Results ◽  
The Magnetic Field

Mössbauer spectroscopic measurements have been carried out for CeSn 3 and CeSn 3.1 single crystals in the temperature range 1.5 K to 300 K under applied magnetic field, with an aim to look into the local surroundings of the Sn site and the possibility of magnetization at low temperatures. The spectra indicate a paramagnetic ground state throughout the temperature range with two different doublets associated with two sites S1 and S2. This indicates two crystallographic sites of Sn with the presence of a distortion in the cubic crystal. However, the contribution of S2 site is very small (only 3% for the CeSn 3 but slightly higher, i.e., 4.3% for the CeSn 3.1) at room temperature. Upon cooling (below 4 K), the S2 contribution disappears for the stoichiometric sample ( CeSn 3) but continues to stay for the slightly nonstoichiometric compound ( CeSn 3.1). The isomer shift reveals a Sn 2+ valence state throughout. A weak hyperfine field has been observed only at low temperatures (4.2 and 1.5 K spectra) for both the compounds, but not for the 300 K spectra. This is indicative of some magnetization, i.e., an increase in magnetic moments of Ce atoms, that is felt by the neighbor Sn atoms through RKKY interactions. However, upon cooling the samples from 4.2 K to 1.5 K, no further enhancement in magnetization is observed. The magnetic field was also applied for the CeSn 3 sample at low temperatures to check if there is any enhancement in the magnetic properties that yielded negative results, i.e., the applied field is equal to the hyperfine field, indicating no enhancement of magnetic moment.

scholarly journals Diseño de una aplicación de realidad aumentada para uso docente

2020 ◽  
Author(s):  
Gabriel Peris ◽  
Ana Iris Escudero ◽  
Begoña Peña
Keyword(s):  
Augmented Reality ◽  
State Of The Art ◽  
Thermal Engineering ◽  
Refrigeration Cycle ◽  
Preliminary Design ◽  
Vapor Compression ◽  
Teachers And Students ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration ◽  
The Subject

Augmented reality technologies have great potential in many sectors and, in particular, in the field of education. In order to reinforce learning process in a more attractive fashion for students, increasing the engagement in the subject, this paper presents the procedure followed in the preliminary design of an application of augmented reality for learning purposes.Specifically, the augmented reality will be used to show the operation of a drinking fountain based on the vapor compression refrigeration cycle. The APP would be useful for subjects in the field of Thermal Engineering in Engineering studies.In this work, a review of the state of the art and associated emerging technologies has been presented, as well as the results of the surveys carried out on teachers and students. The procedure followed in the development of the APP is also explained and the preliminary design is shown.

Electrical Transport Properties of Rare Earth Doped Pentatellurides

2001 ◽  
Vol 691 ◽  
Author(s):  
Nathan D. Lowhorn ◽  
Terry M. Tritt ◽  
R. T. Littleton ◽  
Edward E. Abbott ◽  
J. W. Kolis
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Electrical Transport ◽  
Low Temperatures ◽  
Room Temperature ◽  
Peak Temperature ◽  
Electrical Transport Properties ◽  
Zero Crossing ◽  
Highly Sensitive ◽  
Rare Earth Doped

ABSTRACTThe transition metal pentatellurides HfTe5 and ZrTe5 exhibit a broad resistive anomaly as a function of temperature. This behavior is also reflected in the thermopower as it changes from a large positive value below room temperature to a large negative value at lower temperatures with the zero crossing corresponding well with the peak temperature of the resistive anomaly. The large values of the thermopower at low temperatures (T ≈ 150 K) have made these materials attractive for investigation for potential low temperature thermoelectric applications. The magnitude of the resistive peak and the peak temperature are highly sensitive to doping as well as external influences such as magnetic field and pressure. In this study we examine the effect of doping with various rare earth elements (RE = Ce, Sm and Dy) and the subsequent effects on the electrical resistivity and the thermopower. These results will be discussed in relation to the thermoelectric performance of these materials.

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