Guilherme Fidelis Peixer
@polo.ufsc.br
Department of Mechanical Engineering
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Energy, Nuclear Energy and Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Pedro M. Silva, G. F. Peixer, A. Lorenzoni, Yan C. Azeredo, R. C. Flesch, J. Lozano and Jader R. Barbosa
G. F. Peixer, A. Lorenzoni, Yan C. Azeredo, Pedro M. Silva, Maria Claudia Régio e Silva, Gislaine Hoffmann, Diego dos Santos, Sergio L. Dutra, Gabriel M. do Rosário, Hígor F. Teza,et al.
Allan M. Döring, Diego D.A.C. Reif, Marcelo A. Rosa, G. F. Peixer, F. Maccari, Konstantin P. Skokov, O. Gutfleisch, P. Wendhausen, J. Lozano, Jader R. Barbosa,et al.
Gislaine Hoffmann, A. Nakashima, G. F. Peixer, J. Lozano, J. Barbosa and R. Flesch
Luis F. Cattelan, Guilherme F. Peixer, Maurício V. F. da Luz, Jader R. Barbosa, and Jaime A. Lozano
IEEE
Magnetocaloric systems are one of the most promising solutions for decarbonizing cooling systems. However, several challenges must be overcome to enable the technology to reach large-scale market adoption, among which the high cost and volume of the systems can be highlighted, mainly caused by the magnetic circuits (MC). Addressing these challenges requires emphasizing the trade-off between augmenting magnetic flux density and reducing the mass and complexity of the MC. This study introduces a topology optimization method focused on crafting an MC that minimizes volume while maximizing magnetic flux density while employing rectangular prismatic permanent magnet segments. The optimized design, exhibits similar volume and magnetic flux density compared to configurations with non-prismatic segments, substantially lowering manufacturing costs and underscoring the potential of topology optimization methods in overcoming key barriers to the large-scale adoption of magnetocaloric systems.
Guilherme F. Peixer, Alan T. D. Nakashima, Natália M. De Sá, Yan Azeredo, Anderson Lorenzoni, Glenda M. Da Luz, Rogério S. Sucaria, Allan M. Döring, Paulo V. De Faria, Bernardo P. Vieira,et al.
IEEE
Over the last few years, the attention to the carbon footprint of cooling systems has increased substantially, and along with them the demands for the development of more efficient and greener systems. For that, magnetocaloric refrigeration represents a promising solution despite its low technological maturity. This work presents the main finding on the design, commissioning, and performance evaluation of two magnetocaloric prototypes: a wine cooler and an air conditioner. The results demonstrate that the technology still requires improvements regarding the efficiency, cost, and mass of the systems, and the reliability of materials and components. However, investments in technology are expected to soar over the next years due to pressure from society and regulatory agencies.
L. F. Cattelan, G. F. Peixer, M. D. Da Luz, Jader R. Barbosa and J. Lozano
Mayara Silvestre de Oliveira, Guilherme Fidelis Peixer, F. Forcellini, Jader Riso Barbosa and Jaime Andrés Lozano Cadena
The literature acknowledges the advantages of Set-Based Concurrent Engineering (SBCE), but there is a lack of models for its adoption and documented cases of its implementation, mostly on products with consolidated technology, which raises the possibility of expanding SBCE for highly innovative products. These projects often have extensive resource limitations, leading to computational tools and mathematical modelling as fundamental sources of information. This paper proposes a method for model-based Trade-off Curves (ToC) generation to support SBCE. We adopted it to develop a magnetic air conditioner. The use of model-based ToC enabled the narrowing of the design space and monitoring of the design parameters and performance metrics and enabled SBCE adoption in the design process. The main contributions of this research are presenting the state-of-the-art in ToC generation and application, proposing the model, and demonstrating SBCE in highly innovative projects, while its importance lies in the opportunity to further disseminate SBCE to different development environments.
G. F. Peixer, Maria Claudia Régio e Silva, A. Lorenzoni, Gislaine Hoffmann, Diego dos Santos, Gabriel M. do Rosário, Elias Pagnan, Hígor F. Teza, Pedro M. Silva, Sergio L. Dutra,et al.
G. F. Peixer, A. Nakashima, J. Lozano and J. Barbosa
A. Nakashima, G. F. Peixer, J. Lozano and J. Barbosa
Elsevier BV
Mayara Silvestre de Oliveira, Guilherme Fidelis Peixer, Fernando Antônio Forcellini, Jader Riso Barbosa Junior, and Jaime Andrés Lozano Cadena
Set-Based Design (SBD) is superior in risk reduction, knowledge creation, and innovation. However, its implementation demands more resources than traditional strategies. Thus, it is crucial to balance design space size and available resources to disseminate SBD. This paper proposes a method to define the level of innovation of subsystems enabling a hybrid development strategy, integrating the SBD and the Point-Based Design (PBD). We undertook a research action in a technological innovation design subject to significant knowledge and human/financial resource restrictions. The team allocated most resources in the SBD and focused efforts on critical subsystems. The exploratory and scientific nature of SBD enabled learning about the product without prior knowledge for supporting decision-making. By presenting the state-of-the-art regarding innovation level in SBD and proposing a method to define the level of innovation and a hybrid development strategy, this research paves the way for SBD in projects with significant resource restrictions.
GUILHERME F. PEIXER, SERGIO L. DUTRA, RICARDO S. CALOMENO, NATÁLIA M. DE SÁ, GUSTTAV B. LANG, JAIME A. LOZANO, and JADER R. BARBOSA JR
FapUNIFESP (SciELO)
Conventional and not-in-kind refrigerators require heat exchangers for their operation. Yet, most magnetic cooling studies do not take full account of those components despite their importance in defining the cooling capacity and temperature span. To investigate the influence of heat exchanger design parameters on the performance of magnetic refrigerators, a model was developed to integrate the heat exchangers, regenerators and thermal reservoirs. The results were compared with data generated in an apparatus that emulates the conditions of the thermal fluid supplied by the regenerators to a cold heat exchanger positioned inside the cabinet of a retrofitted 130-liter wine cooler. Six tube-fin heat exchangers were evaluated to identify the most suitable geometry (number of tube rows and fin density) for the compact magnetic refrigerator. Numerical simulations described the influence of the heat exchanger on the regenerator performance in terms of the liquid stream effectiveness. For a temperature span of 20°C between the external environment and the refrigerated compartment, the best heat exchanger/fan assembly resulted in a cooling capacity reduction of 37\\% and a temperature span increase of 32\\%, in comparison with an idealized system. The expected system coefficient of performance (COP) and second-law efficiency were 1.8\\% and 13\\%, respectively.
RICARDO S. CALOMENO, SERGIO L. DUTRA, NATÁLIA M. DE SÁ, GUILHERME F. PEIXER, JAIME A. LOZANO, and JADER R. BARBOSA JR.
FapUNIFESP (SciELO)
The present study analyzes the time-dependent thermal behavior of a retrofitted wine refrigerator cabinet operated by a caloric system emulator. The presence of a full load of wine bottles enabled the assessment of the thermal stratification inside the cabinet. Further experimental tests have been performed to quantify the overall thermal conductance of the cabinet walls and the thermal conductance of the glass door. A detailed mathematical model was developed to predict the temperature pull down in the refrigerated compartment, considering the interaction between the cabinet air and the wine bottles. In addition to the air and bottle temperatures, a good agreement (lower than 15% relative error) was observed for the cooling capacity. The numerical simulations revealed that the cabinet door was responsible for approximately 60% of the thermal load (even though it corresponded to approximately 20% of the cabinet external area).
Alan T.D. Nakashima, Fábio P. Fortkamp, Natália M. de Sá, Victor M.A. dos Santos, Gislaine Hoffmann, Guilherme F. Peixer, Sergio L. Dutra, Marcelo C. Ribeiro, Jaime A. Lozano, and Jader R. Barbosa
Elsevier BV
P.V. Trevizoli, G.F. Peixer, A.T. Nakashima, M.S. Capovilla, J.A. Lozano, and J.R. Barbosa
G. F. Peixer, R. S. Calomeno and G. B. Lang
Refrigeration systems, including the magnetic ones, require heat exchangers for their operation. Curiously, most of research studies in magnetic cooling do not consider these components in their analyses. This work presents an evaluation of the influence of the heat exchangers on the thermodynamic performance of an active magnetic regenerator. A model based on the e-NTU method is proposed to integrate the heat exchangers and the regenerator. Commercially available fan assisted tube-fin heat exchangers were selected for the evaluation of the most suitable options for application in a compact magnetic refrigerator. Numerical simulation showed that the influence of the heat exchanger on the regenerator performance can be represented by the product of the heat exchanger effectiveness and the ratio of the thermal capacity rates of the streams. For a system temperature span of 20 K, the best heat exchanger/fan assembly resulted in a reduction of 36.1% in the cooling capacity and an increase of 48.3% in the active magnetic regenerator temperature span.
Paulo V. Trevizoli, Alan T. Nakashima, Guilherme F. Peixer, and Jader R. Barbosa
Elsevier BV
Paulo V. Trevizoli, Alan T. Nakashima, Guilherme F. Peixer, and Jader R. Barbosa
Elsevier BV
Paulo V. Trevizoli, Guilherme F. Peixer, and Jader R. Barbosa
Elsevier BV
Paulo V. Trevizoli, Jaime A. Lozano, Guilherme F. Peixer, and Jader R. Barbosa Jr.
Elsevier BV