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Juan Manuel Belman
Department of Mechanical Engineering, DICIS, University of Guanajuato, Salamanca-Valle de Santiago km 3.5+1.8, CP. 36885, Salamanca, Gto., Mexico

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Research papers
Published: 30 July 2021 in Journal of Thermal Science and Engineering Applications
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This paper investigates the effect of trapezoidal baffles inside a planar-type solid oxide fuel cell. To achieve the objective, four cases are proposed: (1) simple planar geometry as a base case, (2) trapezoidal baffles inside the fuel channel, (3) trapezoidal baffles inside the air channel, and (4) trapezoidal baffles in both fuel and air channels. The height of the trapezoidal baffles inside the channels of the solid oxide fuel cell increases along the direction of the fluid flow. The numerical investigation is based on a three-dimensional computational fluid dynamics (CFD) model that takes into account the phenomenon of mass transfer, heat transfer, species transport, and electrochemical reactions. A detailed comparison of the performance between the four cases of the fuel cell is provided in terms of power density, fluid flow, species concentration, temperature distributions, and electric fields at a variable current density and a fixed power density of 3000 W/m2. The results show that the power density, the velocity, the availability of the hydrogen and oxygen species on the electrodes-electrolyte interfaces increases for case 2, case 3, and case 4, respectively, in comparison to case 1. Finally, the average temperature of the electrode–electrolyte interface is reduced with the baffles, and it is concluded that the configuration with baffles inside the air channel (case 3) shows better results in terms of the increment of the power density and the decrement of the average temperature.

ACS Style

José De Jesús Ramírez-Minguela; J. Arturo Alfaro-Ayala; Victor-Hugo Rangel-Hernandez; Juan Manuel Belman-Flores; J. L. Rodríguez-Muñoz; T. Pérez-Segura; C. E. Alvarado-Rodríguez. Numerical Analysis of the Effect of Trapezoidal Baffles Inside Fuel and Air Channels on the Performance of a Planar-Type Solid Oxide Fuel Cell. Journal of Thermal Science and Engineering Applications 2021, 14, 1 -30.

AMA Style

José De Jesús Ramírez-Minguela, J. Arturo Alfaro-Ayala, Victor-Hugo Rangel-Hernandez, Juan Manuel Belman-Flores, J. L. Rodríguez-Muñoz, T. Pérez-Segura, C. E. Alvarado-Rodríguez. Numerical Analysis of the Effect of Trapezoidal Baffles Inside Fuel and Air Channels on the Performance of a Planar-Type Solid Oxide Fuel Cell. Journal of Thermal Science and Engineering Applications. 2021; 14 (4):1-30.

Chicago/Turabian Style

José De Jesús Ramírez-Minguela; J. Arturo Alfaro-Ayala; Victor-Hugo Rangel-Hernandez; Juan Manuel Belman-Flores; J. L. Rodríguez-Muñoz; T. Pérez-Segura; C. E. Alvarado-Rodríguez. 2021. "Numerical Analysis of the Effect of Trapezoidal Baffles Inside Fuel and Air Channels on the Performance of a Planar-Type Solid Oxide Fuel Cell." Journal of Thermal Science and Engineering Applications 14, no. 4: 1-30.

Review
Published: 23 May 2021 in Sustainability
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ORC technology is one of the most promising technologies for the use of residual energy in the generation of electrical energy, offering simple and environmentally friendly alternatives. In this field, the selection of working fluids plays an important role in the operation of the cycle, whether in terms of the energy efficiency or the minimization of environmental impacts. Therefore, in this paper, a comprehensive review is presented on the use of R1234yf refrigerant and its mixtures as working fluids in ORC systems. These fluids are used in low- and medium-temperature applications for the use of residual energy generated from solar energy, geothermal energy, and internal combustion engines. It was concluded that R1234yf and its mixtures are competitive as compared with conventional refrigerants used in ORC.

ACS Style

Juan García-Pabón; Dario Méndez-Méndez; Juan Belman-Flores; Juan Barroso-Maldonado; Ali Khosravi. A Review of Recent Research on the Use of R1234yf as an Environmentally Friendly Fluid in the Organic Rankine Cycle. Sustainability 2021, 13, 5864 .

AMA Style

Juan García-Pabón, Dario Méndez-Méndez, Juan Belman-Flores, Juan Barroso-Maldonado, Ali Khosravi. A Review of Recent Research on the Use of R1234yf as an Environmentally Friendly Fluid in the Organic Rankine Cycle. Sustainability. 2021; 13 (11):5864.

Chicago/Turabian Style

Juan García-Pabón; Dario Méndez-Méndez; Juan Belman-Flores; Juan Barroso-Maldonado; Ali Khosravi. 2021. "A Review of Recent Research on the Use of R1234yf as an Environmentally Friendly Fluid in the Organic Rankine Cycle." Sustainability 13, no. 11: 5864.

Short communication
Published: 09 March 2021 in Case Studies in Thermal Engineering
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This study presents the development of a new approximate model for a multilayer wire-on-tube condenser used in the domestic refrigeration industry. This model is based on physical foundations and empirical correlations, as well as on the ε-NTU thermal analysis methodology. It has been designed for three zones according to the state of the refrigerant. The input parameters to the model correspond to typical geometric characteristics of this type of condenser and operating conditions. As output parameters, the emphasis was placed on the thermal capacity of the condenser, and the refrigerant side and air-side outlet temperatures. For its validation, tests were carried out with real refrigerators, one of them operating with R134a and the other with R600a. The model prediction showed maximum relative errors of ±5% for thermal capacity and ±0.5K for temperatures. Finally, a parametric study was carried out analyzing the effect of varying the main geometric parameters such as tube and wire diameters, and wire and tube pitches.

ACS Style

J.M. Belman-Flores; Y. Heredia-Aricapa; Juan J. García-Pabón; A. Gallegos-Muñoz; J. Serrano-Arellano; C. Gutiérrez Pérez-Reguera. An approximate model of a multilayer wire-on-tube condenser operating with R134a and R600a: Experimental validation and parametric analysis. Case Studies in Thermal Engineering 2021, 25, 100927 .

AMA Style

J.M. Belman-Flores, Y. Heredia-Aricapa, Juan J. García-Pabón, A. Gallegos-Muñoz, J. Serrano-Arellano, C. Gutiérrez Pérez-Reguera. An approximate model of a multilayer wire-on-tube condenser operating with R134a and R600a: Experimental validation and parametric analysis. Case Studies in Thermal Engineering. 2021; 25 ():100927.

Chicago/Turabian Style

J.M. Belman-Flores; Y. Heredia-Aricapa; Juan J. García-Pabón; A. Gallegos-Muñoz; J. Serrano-Arellano; C. Gutiérrez Pérez-Reguera. 2021. "An approximate model of a multilayer wire-on-tube condenser operating with R134a and R600a: Experimental validation and parametric analysis." Case Studies in Thermal Engineering 25, no. : 100927.

Journal article
Published: 06 December 2020 in Energies
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CO2-based transcritical refrigeration cycles are currently gaining significant research attention, as they offer a viable solution to the use of natural refrigerants (e.g., CO2). However, there are almost no papers that offer an exergoeconomic comparison between the different configurations of these types of systems. Accordingly, the present work deals with a comparative exergoeconomic analysis of four different CO2-based transcritical refrigeration cycles. In addition, the work is complemented by an analysis of the CO2 abatement costs. The influences of the variation of the evaporating temperature, the gas cooler outlet temperature, and the pressure ratio on the exergy efficiency, product cost rate, exergy destruction cost rate, exergoeconomic factor, and CO2 penalty cost rate are compared in detail. The results show that the transcritical cycle with the ejector has the lowest exergetic product cost and a low environmental impact.

ACS Style

J. M. Belman-Flores; V. H. Rangel-Hernández; V. Pérez-García; A. Zaleta-Aguilar; Qingping Fang; D. Méndez-Méndez. An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles. Energies 2020, 13, 6454 .

AMA Style

J. M. Belman-Flores, V. H. Rangel-Hernández, V. Pérez-García, A. Zaleta-Aguilar, Qingping Fang, D. Méndez-Méndez. An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles. Energies. 2020; 13 (23):6454.

Chicago/Turabian Style

J. M. Belman-Flores; V. H. Rangel-Hernández; V. Pérez-García; A. Zaleta-Aguilar; Qingping Fang; D. Méndez-Méndez. 2020. "An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles." Energies 13, no. 23: 6454.

Journal article
Published: 15 June 2020 in Energies
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A study was conducted on the double diffusion by natural convection because of the effects of heat and pollutant sources placed at one third of the closed cavity’s height. The heat and pollution sources were analyzed separately and simultaneously. The study was considered for the Rayleigh number interval 104 ≤ Ra ≤ 1010. Three case studies were analyzed: (1) differentially heated closed cavity with only heat sources; (2) differentially heated closed cavity with only pollutant sources; and (3) differentially heated closed cavity with heat and pollutant sources. The governing equations of the system were solved through the finite volume technique. The turbulence solution was done with the k-ε model. The dominant influence of the buoyancy forces was found due to the pollutant diffusion on the flow pattern, and an internal temperature increase was observed with the simple diffusion. The most critical case was obtained through the double diffusive convection with an average temperature value of 32.57 °C. Finally, the Nusselt number increased as the Rayleigh number increased; however, the Sherwood number either increased or decreased when the Rayleigh number increased. The highest mean concentration recorded was 2808 ppm; this was found with the value Ra = 106.

ACS Style

Juan Serrano-Arellano; Juan M. Belman-Flores; Jesús Xamán; Karla M. Aguilar-Castro; Edgar V. Macías-Melo. Numerical Study of the Double Diffusion Natural Convection inside a Closed Cavity with Heat and Pollutant Sources Placed near the Bottom Wall. Energies 2020, 13, 3085 .

AMA Style

Juan Serrano-Arellano, Juan M. Belman-Flores, Jesús Xamán, Karla M. Aguilar-Castro, Edgar V. Macías-Melo. Numerical Study of the Double Diffusion Natural Convection inside a Closed Cavity with Heat and Pollutant Sources Placed near the Bottom Wall. Energies. 2020; 13 (12):3085.

Chicago/Turabian Style

Juan Serrano-Arellano; Juan M. Belman-Flores; Jesús Xamán; Karla M. Aguilar-Castro; Edgar V. Macías-Melo. 2020. "Numerical Study of the Double Diffusion Natural Convection inside a Closed Cavity with Heat and Pollutant Sources Placed near the Bottom Wall." Energies 13, no. 12: 3085.

Journal article
Published: 14 February 2020 in Journal of Thermal Science and Engineering Applications
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A transient study of the cooling process inside a cabinet is presented in this work. Computational fluid dynamics (CFD) is used to obtain the transient temperature of the air inside a small cabinet. Three cooling levels, named Case 1, Case 2, and Case 3, were studied under different lapses of time and operational conditions. The temperature of the evaporator plate and the temperature of the room change with time through the implementation of user-defined functions (UDFs). The buoyancy effects that occur inside the cabinet (natural convection) were modeled using the approximation of all the properties fitted to temperature polynomials (PFTP). The transient temperature of the air inside the cabinet was obtained, until the second ON/OFF stage is reached, for the three cases studied. The prediction of the transient temperature of the air inside the small cabinet was validated with experimental data. The average relative errors of the transient temperatures of the air inside the cabinet were 0.49%, 0.19%, and 0.13% for Case 1, Case 2, and Case 3, respectively. The behavior of the temperature and velocity distributions of the air inside the cabinet for the ON and OFF stages is obtained. Finally, a better range of the temperature for the preservation of food, medicines, and biological matter is obtained with an increase in the thickness of the insulation material. An increment of 14.9% of the removed energy was obtained inside the cabinet with 12 cm of the insulation material, and this increment is related to the case with no insulation material. The results of this work could help in improving the design and performance of the cabinets in further works.

ACS Style

J. Arturo Alfaro-Ayala; José De Jesús Ramírez-Minguela; Armando Gallegos-Muñoz; D. Hernández-Fusilier; Juan Manuel Belman Flores. Transient Study of the Cooling Process of a Small Cabinet. Journal of Thermal Science and Engineering Applications 2020, 12, 1 -29.

AMA Style

J. Arturo Alfaro-Ayala, José De Jesús Ramírez-Minguela, Armando Gallegos-Muñoz, D. Hernández-Fusilier, Juan Manuel Belman Flores. Transient Study of the Cooling Process of a Small Cabinet. Journal of Thermal Science and Engineering Applications. 2020; 12 (4):1-29.

Chicago/Turabian Style

J. Arturo Alfaro-Ayala; José De Jesús Ramírez-Minguela; Armando Gallegos-Muñoz; D. Hernández-Fusilier; Juan Manuel Belman Flores. 2020. "Transient Study of the Cooling Process of a Small Cabinet." Journal of Thermal Science and Engineering Applications 12, no. 4: 1-29.

Journal article
Published: 01 January 2020 in Computer Modeling in Engineering & Sciences
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In the present study, an analysis of the heat and mass transfer in a ventilated cavity in a warm climate zone was carried out to analyze, among others, the temperatures and percentage of relative humidity (RH). The governing equations of the mathematical model were solved through the finite volume method. We used the k-ε turbulence mode to find the results of the variables of interest in seven climate records on a given day. The velocity of the inlet flow of the air-H2O mixture was varied through the Reynolds number (Re) from 500 to 10000. The outdoor weather conditions considered were solar radiation, ambient temperature, and RH. It was found that at low velocities, flow recirculation was formed inside the cavity which increased the temperature and concentration of RH. For Re=5000 the flow is predominantly forced, which tends to set the values of temperature and RH as 20°C and 20% respectively. The values of the RH increase in the afternoon hours when the solar radiation decreases to the value of zero. However, the mass transfer through the values of Sh is maintained with similar values in the seven weather records. It was concluded that when air conditioning supplies air at speeds higher than 0.26 m/s at low temperatures it produces cooling with low RH, this causes discomfort, illness and/or discomfort to the users.

ACS Style

J. Serrano-Arellano; J. M. Belman-Flores; I.Hern醤dez-P閞ez; K. M. Aguilar-Castro; E.V.Mac韆s-Melo; F. Elizalde-Blancas; J.M.Riesco-羦ila; F.J.Garc韆-Rodr韌uez. Numerical Study of the Distribution of Temperatures and Relative Humidity in a Ventilated Room Located in Warm Weather. Computer Modeling in Engineering & Sciences 2020, 123, 571 -602.

AMA Style

J. Serrano-Arellano, J. M. Belman-Flores, I.Hern醤dez-P閞ez, K. M. Aguilar-Castro, E.V.Mac韆s-Melo, F. Elizalde-Blancas, J.M.Riesco-羦ila, F.J.Garc韆-Rodr韌uez. Numerical Study of the Distribution of Temperatures and Relative Humidity in a Ventilated Room Located in Warm Weather. Computer Modeling in Engineering & Sciences. 2020; 123 (2):571-602.

Chicago/Turabian Style

J. Serrano-Arellano; J. M. Belman-Flores; I.Hern醤dez-P閞ez; K. M. Aguilar-Castro; E.V.Mac韆s-Melo; F. Elizalde-Blancas; J.M.Riesco-羦ila; F.J.Garc韆-Rodr韌uez. 2020. "Numerical Study of the Distribution of Temperatures and Relative Humidity in a Ventilated Room Located in Warm Weather." Computer Modeling in Engineering & Sciences 123, no. 2: 571-602.

Review article
Published: 15 November 2019 in International Journal of Refrigeration
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The current European F-gas regulation establishes restrictions in the use of fluoride refrigerants with a high global warming potential (GWP) in applications of refrigeration and air conditioning (RAC) systems. Moreover, a gradual limitation on the GWP weight of the fluoride refrigerants placed on the market is ongoing and will end with approximately one-fifth of today's offer. In this context, many of the RAC systems operate with refrigerants R134a, R404A, and R410A that have GWP values of 1300, 3943 and 2088, respectively, are being forced to be replaced by environmentally friendly alternatives, like hydrofluoroolefin (HFO) refrigerants and their mixtures with hydrofluorocarbons (HFC), which can be designed to present intermediate characteristics and become the ideal candidate many RAC applications. This work presents the most recent HFC/HFO/HC/R744 refrigerant mixture options for an alternative to the refrigerants mentiond above and compares their energetic and performance with the early developed mixture prototypes.

ACS Style

Y. Heredia-Aricapa; J.M. Belman-Flores; A. Mota-Babiloni; J. Serrano-Arellano; Juan J. García-Pabón. Overview of low GWP mixtures for the replacement of HFC refrigerants: R134a, R404A and R410A. International Journal of Refrigeration 2019, 111, 113 -123.

AMA Style

Y. Heredia-Aricapa, J.M. Belman-Flores, A. Mota-Babiloni, J. Serrano-Arellano, Juan J. García-Pabón. Overview of low GWP mixtures for the replacement of HFC refrigerants: R134a, R404A and R410A. International Journal of Refrigeration. 2019; 111 ():113-123.

Chicago/Turabian Style

Y. Heredia-Aricapa; J.M. Belman-Flores; A. Mota-Babiloni; J. Serrano-Arellano; Juan J. García-Pabón. 2019. "Overview of low GWP mixtures for the replacement of HFC refrigerants: R134a, R404A and R410A." International Journal of Refrigeration 111, no. : 113-123.

Journal article
Published: 01 June 2019 in Revista Mexicana de Ingeniería Química
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ACS Style

Jean Fulbert Ituna Yudonago; Universidad Nacional Autónoma De México; J.M. Belman-Flores; F. Elizalde-Blancas; V. Pérez-García; O. García-Valladares; I. Carvajal-Mariscal. NUMERICAL ANALYSIS OF CO2 TRANSIENT BEHAVIOR IN THE GAS COOLER DURING VARIABLE START-UP CONDITIONS OF A TRANSCRITICAL REFRIGERATION SYSTEM. Revista Mexicana de Ingeniería Química 2019, 18, 1101 -1118.

AMA Style

Jean Fulbert Ituna Yudonago, Universidad Nacional Autónoma De México, J.M. Belman-Flores, F. Elizalde-Blancas, V. Pérez-García, O. García-Valladares, I. Carvajal-Mariscal. NUMERICAL ANALYSIS OF CO2 TRANSIENT BEHAVIOR IN THE GAS COOLER DURING VARIABLE START-UP CONDITIONS OF A TRANSCRITICAL REFRIGERATION SYSTEM. Revista Mexicana de Ingeniería Química. 2019; 18 (3):1101-1118.

Chicago/Turabian Style

Jean Fulbert Ituna Yudonago; Universidad Nacional Autónoma De México; J.M. Belman-Flores; F. Elizalde-Blancas; V. Pérez-García; O. García-Valladares; I. Carvajal-Mariscal. 2019. "NUMERICAL ANALYSIS OF CO2 TRANSIENT BEHAVIOR IN THE GAS COOLER DURING VARIABLE START-UP CONDITIONS OF A TRANSCRITICAL REFRIGERATION SYSTEM." Revista Mexicana de Ingeniería Química 18, no. 3: 1101-1118.

Journal article
Published: 17 May 2019 in International Journal of Refrigeration
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In this paper, an alternative global model of a small commercial diffusion-absorption refrigerator to predict the outlet temperatures of each component, the liquid and vapor mass flow for the bubble pump and COP of the system is presented and compared with the experimental results. The model requires as input parameters: the thermal conditions (based on thermostat positions), the geometrical parameters and the ambient temperature. The results are displayed for seven different thermostat positions, where the temperature predictions indicate that the main components of the system have a deviation lesser than ±4K. In the case of COP, the maximum relative error is 8% compared with experimental results.

ACS Style

V. Pérez-García; J.L. Rodríguez-Muñoz; J.M. Belman-Flores; C. Rubio-Maya; J.J. Ramírez-Minguela. Theoretical modeling and experimental validation of a small capacity diffusion-absorption refrigerator. International Journal of Refrigeration 2019, 104, 302 -310.

AMA Style

V. Pérez-García, J.L. Rodríguez-Muñoz, J.M. Belman-Flores, C. Rubio-Maya, J.J. Ramírez-Minguela. Theoretical modeling and experimental validation of a small capacity diffusion-absorption refrigerator. International Journal of Refrigeration. 2019; 104 ():302-310.

Chicago/Turabian Style

V. Pérez-García; J.L. Rodríguez-Muñoz; J.M. Belman-Flores; C. Rubio-Maya; J.J. Ramírez-Minguela. 2019. "Theoretical modeling and experimental validation of a small capacity diffusion-absorption refrigerator." International Journal of Refrigeration 104, no. : 302-310.

Journal article
Published: 07 May 2019 in International Journal of Refrigeration
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This paper proposes a novel fuzzy logic control system for a domestic refrigerator taking into consideration the status of the door. The goal of this system is to keep the temperature of the fresh food compartment as close as possible to the set point while saving energy. The fuzzy logic system was set up to control the speed of the compressor. The set of inference rules in this study incorporated the frequency and duration of the door opening. These rules try reducing the compressor speed at a minimum value, and therefore, reducing the number of times the compressor is turned off when the door is open. To compare and evaluate the control systems, several tests with different configuration and rules were performed. Each test ran for seventeen hours, during this time the test included three periods when the door was opened and closed several times. It was concluded that the electric current when the compressor starts was reduced and produced an overall energy saving of 3%. Thus, it is evident that the more information is incorporated into a fuzzy logic system, the more energy savings can be obtained.

ACS Style

Juan Belman; Sergio Ledesma; David Alejandro Rodriguez Valderrama; D. Hernández-Fusilier. Energy optimization of a domestic refrigerator controlled by a fuzzy logic system using the status of the door. International Journal of Refrigeration 2019, 104, 1 -8.

AMA Style

Juan Belman, Sergio Ledesma, David Alejandro Rodriguez Valderrama, D. Hernández-Fusilier. Energy optimization of a domestic refrigerator controlled by a fuzzy logic system using the status of the door. International Journal of Refrigeration. 2019; 104 ():1-8.

Chicago/Turabian Style

Juan Belman; Sergio Ledesma; David Alejandro Rodriguez Valderrama; D. Hernández-Fusilier. 2019. "Energy optimization of a domestic refrigerator controlled by a fuzzy logic system using the status of the door." International Journal of Refrigeration 104, no. : 1-8.

Journal article
Published: 05 March 2019 in Energies
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This work presents the main behaviors shown in the habits of consumers of domestic refrigerators, which influences the energy consumption of this appliance. This study is based on a series of surveys answered by 200 consumers from four cities in the State of Guanajuato, Mexico. The questions were arranged with the aim of evaluating the general characteristics and usage habits such as refrigerator age, door opening frequency, damper position, load of food supplies, external and internal cleaning habits, and nearby heat sources, among other things. The randomly interviewed consumers were individuals between 20 and 60 years of age, who were interviewed using handmade surveys by experts in the field of refrigeration. In some cases, photographic evidence was gathered from the consumers’ refrigerators to represent the typical usage habits. In general, the results show that better usage habits are necessary from an energy point of view. Most consumers agree with adopting best practices for using their refrigerator.

ACS Style

Juan M. Belman-Flores; Diana Pardo-Cely; Francisco Elizalde-Blancas; Armando Gallegos-Muñoz; Vicente Pérez-García; Miguel A. Gómez-Martínez. Perspectives on Consumer Habits with Domestic Refrigerators and Its Consequences for Energy Consumption: Case of Study in Guanajuato, Mexico. Energies 2019, 12, 860 .

AMA Style

Juan M. Belman-Flores, Diana Pardo-Cely, Francisco Elizalde-Blancas, Armando Gallegos-Muñoz, Vicente Pérez-García, Miguel A. Gómez-Martínez. Perspectives on Consumer Habits with Domestic Refrigerators and Its Consequences for Energy Consumption: Case of Study in Guanajuato, Mexico. Energies. 2019; 12 (5):860.

Chicago/Turabian Style

Juan M. Belman-Flores; Diana Pardo-Cely; Francisco Elizalde-Blancas; Armando Gallegos-Muñoz; Vicente Pérez-García; Miguel A. Gómez-Martínez. 2019. "Perspectives on Consumer Habits with Domestic Refrigerators and Its Consequences for Energy Consumption: Case of Study in Guanajuato, Mexico." Energies 12, no. 5: 860.

Journal article
Published: 27 January 2019 in Energies
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This study seeks to understand the thermal and energetic behavior of a domestic refrigerator more widely by experimentally evaluating the main effects of the thermal load (food) and the variation of the ambient temperature. To carry out the experiments, the thermal load was classified based on the results of a survey conducted on different consumers in the state of Guanajuato, Mexico. The thermal behavior of both compartments of the refrigerator, the total energy consumption, the power of the compressor in its first on-state, and the coefficient of performance, according to the classification of the thermal loads and the room temperature, were evaluated. Finally, it is verified that the thermal load and the room temperature have a significant influence on the energy performance of the refrigerator.

ACS Style

Juan M. Belman-Flores; Diana Pardo-Cely; Miguel A. Gómez-Martínez; Iván Hernández-Pérez; David A. Rodríguez-Valderrama; Yonathan Heredia-Aricapa. Thermal and Energy Evaluation of a Domestic Refrigerator under the Influence of the Thermal Load. Energies 2019, 12, 400 .

AMA Style

Juan M. Belman-Flores, Diana Pardo-Cely, Miguel A. Gómez-Martínez, Iván Hernández-Pérez, David A. Rodríguez-Valderrama, Yonathan Heredia-Aricapa. Thermal and Energy Evaluation of a Domestic Refrigerator under the Influence of the Thermal Load. Energies. 2019; 12 (3):400.

Chicago/Turabian Style

Juan M. Belman-Flores; Diana Pardo-Cely; Miguel A. Gómez-Martínez; Iván Hernández-Pérez; David A. Rodríguez-Valderrama; Yonathan Heredia-Aricapa. 2019. "Thermal and Energy Evaluation of a Domestic Refrigerator under the Influence of the Thermal Load." Energies 12, no. 3: 400.

Journal article
Published: 14 January 2019 in International Journal of Refrigeration
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The replacement of refrigerants in domestic refrigerators is nowadays one of the approaches used to enhance the performance and environmental impact of these systems. Theoretical and experimental research, mainly focused on energy or exergy analysis, is currently found in the literature, but only a few studies are focused on exergoeconomic approaches. Therefore, in order to include the overall costs of a domestic refrigerator, an exergoeconomic cost analysis is applied to an experimental installation. Exergoeconomic parameters such as the unit exergy cost (cp) and the exergoeconomic factor (f) are used as a comparative indicator of performance. Based on the unit exergy cost, the results show that R134a performs better than R1234yf at different operating conditions. The exergoeconomic factor presents higher values for R134a than for R1234yf, which implies less exergy destruction in the system. The optimization allows reducing the cost of the produced cold by 9.8% when using R134a and by 6.5% when using R1234yf.

ACS Style

V.H. Rangel-Hernández; J.M. Belman-Flores; David Alejandro Rodriguez Valderrama; D. Pardo-Cely; Andrea Del Pilar Rodriguez Muñoz; J.J. Ramírez-Minguela. Exergoeconomic performance comparison of R1234yf as a drop-in replacement for R134a in a domestic refrigerator. International Journal of Refrigeration 2019, 100, 113 -123.

AMA Style

V.H. Rangel-Hernández, J.M. Belman-Flores, David Alejandro Rodriguez Valderrama, D. Pardo-Cely, Andrea Del Pilar Rodriguez Muñoz, J.J. Ramírez-Minguela. Exergoeconomic performance comparison of R1234yf as a drop-in replacement for R134a in a domestic refrigerator. International Journal of Refrigeration. 2019; 100 ():113-123.

Chicago/Turabian Style

V.H. Rangel-Hernández; J.M. Belman-Flores; David Alejandro Rodriguez Valderrama; D. Pardo-Cely; Andrea Del Pilar Rodriguez Muñoz; J.J. Ramírez-Minguela. 2019. "Exergoeconomic performance comparison of R1234yf as a drop-in replacement for R134a in a domestic refrigerator." International Journal of Refrigeration 100, no. : 113-123.

Journal article
Published: 01 January 2019 in International Journal of Hydrogen Energy
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In this work a detailed analysis of the overpotentials inherent during the operation of a solid oxide fuel cell (SOFC) is presented. The study is performed in order to evaluate the effect of the design of the current collectors on SOFCs performance. The analysis is carried out by means of numerical simulations in different current collector configurations consisting of straight channels in which their width is varied. Special attention is paid in the ohmic and concentration losses which are directly related with the design of the current collectors. Polarization and power density curves are obtained for different current collector designs operating at the same conditions. The ohmic losses were directly affected by the ratio between the gas channels-electrode interface area and the active area. Increasing or decreasing the area ratio around a certain value causes the ohmic losses to increase exponentially. Moreover, the concentration losses showed an opposite behavior when compared with the ohmic losses. The best performance was obtained when the ratio between the gas channels-electrode interface area and the active area is about 0.36.

ACS Style

Julio Moreno-Blanco; Francisco Elizalde-Blancas; Jose M. Riesco-Avila; Juan M. Belman-Flores; Armando Gallegos-Muñoz. On the effect of gas channels-electrode interface area on SOFCs performance. International Journal of Hydrogen Energy 2019, 44, 446 -456.

AMA Style

Julio Moreno-Blanco, Francisco Elizalde-Blancas, Jose M. Riesco-Avila, Juan M. Belman-Flores, Armando Gallegos-Muñoz. On the effect of gas channels-electrode interface area on SOFCs performance. International Journal of Hydrogen Energy. 2019; 44 (1):446-456.

Chicago/Turabian Style

Julio Moreno-Blanco; Francisco Elizalde-Blancas; Jose M. Riesco-Avila; Juan M. Belman-Flores; Armando Gallegos-Muñoz. 2019. "On the effect of gas channels-electrode interface area on SOFCs performance." International Journal of Hydrogen Energy 44, no. 1: 446-456.

Journal article
Published: 14 December 2018 in Applied Thermal Engineering
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A crucial aspect of Joule-Thomson cryocooler analysis and optimization is the accurate estimation of frictional pressure drop. This paper presents a pressure drop model for boiling of non-azeotropic mixtures of nitrogen with hydrocarbons (e.g., methane, ethane, and propane) in microchannels. These refrigerant mixtures are important for their applicability in natural gas liquefaction plants. The pressure drop model is based on computational intelligence techniques, and its performance is evaluated with the mean relative error (mre), and compared with three correlations previously selected as most accurate: Awad and Muzychka; Sun and Mishima; and Cicchitti et al. Comparison between the proposed artificial neural network (ANN) model and the three correlations shows the advantages of the ANN to predict pressure drop for non-azeotropic mixtures. Existing correlations predict experimental data within mre=23.9-25.3%, while the ANN has mre = 8.3%. Additional features of the ANN model include: (1) applicability to laminar, transitional and turbulent flow, and (2) demonstrated applicability to experiments not used in the training process. Therefore, the ANN model is recommended for predicting pressure drop due to accuracy and ease of applicability.

ACS Style

Juan Manuel Barroso-Maldonado; Jhon Montanez Barrera; Juan Belman; S.M. Aceves. ANN-based correlation for frictional pressure drop of non-azeotropic mixtures during cryogenic forced boiling. Applied Thermal Engineering 2018, 149, 492 -501.

AMA Style

Juan Manuel Barroso-Maldonado, Jhon Montanez Barrera, Juan Belman, S.M. Aceves. ANN-based correlation for frictional pressure drop of non-azeotropic mixtures during cryogenic forced boiling. Applied Thermal Engineering. 2018; 149 ():492-501.

Chicago/Turabian Style

Juan Manuel Barroso-Maldonado; Jhon Montanez Barrera; Juan Belman; S.M. Aceves. 2018. "ANN-based correlation for frictional pressure drop of non-azeotropic mixtures during cryogenic forced boiling." Applied Thermal Engineering 149, no. : 492-501.

Journal article
Published: 12 November 2018 in IEEE Access
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In this paper, a domestic refrigerator was tested to determine the power consumption for different positions of the shelves. The main contribution of this paper is the application of several strategies to analyze and model the power consumption of a domestic refrigerator when the fresh food shelves are changed of position. First, computer simulations were performed to analyze the power consumption using the moving average, the numerical derivative, and the Fourier transform. These simulations were used to study changes, periodic behaviors, minimum, maximum, and average values for the power consumption. Second, prediction methods were used to model the power consumption, these methods include cubic splines, the bilinear method, and artificial neural networks. With these methods, 2-D color graphs were built to predict the power consumption for any shelves positions. The validation results revealed that the cubic spline method provides the best results. Finally, it can be concluded that the models proposed in this paper provides new insights that can be used to design the internal compartments of the fresh food in order to try reducing the energy consumption.

ACS Style

Sergio Ledesma; Juan Manuel Belman-Flores; Eduardo Cabal-Yepez; Arturo Morales-Fuentes; Jorge Arturo Alfaro-Ayala; Mario-Alberto Ibarra-Manzano. Mathematical Models to Predict and Analyze the Energy Consumption of a Domestic Refrigerator for Different Position of the Shelves. IEEE Access 2018, 6, 68882 -68891.

AMA Style

Sergio Ledesma, Juan Manuel Belman-Flores, Eduardo Cabal-Yepez, Arturo Morales-Fuentes, Jorge Arturo Alfaro-Ayala, Mario-Alberto Ibarra-Manzano. Mathematical Models to Predict and Analyze the Energy Consumption of a Domestic Refrigerator for Different Position of the Shelves. IEEE Access. 2018; 6 ():68882-68891.

Chicago/Turabian Style

Sergio Ledesma; Juan Manuel Belman-Flores; Eduardo Cabal-Yepez; Arturo Morales-Fuentes; Jorge Arturo Alfaro-Ayala; Mario-Alberto Ibarra-Manzano. 2018. "Mathematical Models to Predict and Analyze the Energy Consumption of a Domestic Refrigerator for Different Position of the Shelves." IEEE Access 6, no. : 68882-68891.

Journal article
Published: 01 October 2018 in Journal of Solar Energy Engineering
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A solar radiation model is applied to a low temperature water-in-glass evacuated tubes solar collector to predict its performance via computational fluid dynamics (CFD) numerical simulations. This approach allows obtaining the transmitted, reflected, and absorbed solar radiation flux and the solar heat flux on the surface of the evacuated tubes according to the geographical location, the date, and the hour of a day. Different environmental and operational conditions were used to obtain the outlet temperature of the solar collector; these results were validated against four experimental tests based on an Official Mexican Standard resulting in relative errors between 0.8% and 2.6%. Once the model is validated, two cases for the solar collector were studied: (i) different mass flow rates under a constant solar radiation and (ii) different solar radiation (due to the hour of the day) under a constant mass flow rate to predict its performance and efficiency. For the first case, it was found that the outlet temperature decreases as the mass flow rate increases reaching a steady value for a mass flow rate of 0.1 kg/s (6 l/min), while for the second case, the results showed a corresponding outlet temperature behavior to the solar radiation intensity reaching to a maximum temperature of 36.5 °C at 14:00 h. The CFD numerical study using a solar radiation model is more realistic than the previous reported works leading to overcome a gap in the knowledge of the low temperature evacuated tube solar collectors.

ACS Style

Oscar A. Lopez-Nunez; J. Arturo Alfaro-Ayala; J. J. Ramírez-Minguela; J. Nicolás Flores-Balderas; J. M. Belman-Flores. Solar Radiation Model Applied to a Low Temperature Evacuated Tubes Solar Collector. Journal of Solar Energy Engineering 2018, 141, 1 .

AMA Style

Oscar A. Lopez-Nunez, J. Arturo Alfaro-Ayala, J. J. Ramírez-Minguela, J. Nicolás Flores-Balderas, J. M. Belman-Flores. Solar Radiation Model Applied to a Low Temperature Evacuated Tubes Solar Collector. Journal of Solar Energy Engineering. 2018; 141 (3):1.

Chicago/Turabian Style

Oscar A. Lopez-Nunez; J. Arturo Alfaro-Ayala; J. J. Ramírez-Minguela; J. Nicolás Flores-Balderas; J. M. Belman-Flores. 2018. "Solar Radiation Model Applied to a Low Temperature Evacuated Tubes Solar Collector." Journal of Solar Energy Engineering 141, no. 3: 1.

Journal article
Published: 06 August 2018 in Energy
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The replacement of HFCs using lower GWP refrigerants in the coming years is a priority to reduce the predicted climate change. The exergy analysis of vapor compression systems can help to identify the feasibility of alternative fluids in existing installations and the potential to improve them. In this sense, this paper presents an exergy analysis of an experimental setup which operates with R134a and the alternative HFO/HFC mixture R513A. The evaporating temperature is ranges between −15 °C and 5 °C, while the condensing temperature is set at 30 °C and 35 °C. In this analysis, the highest amount of exergy destruction rate is obtained at the compressor, followed by the evaporator. The maximum exergy efficiencies are observed at the condenser and the thermostatic expansion device. Finally, the average global exergy efficiency of R513A when replaced R134a in this refrigeration experimental setup is 0.4% higher (absolute difference), and with respect to the components, there is only slight reduction in efficiency in the condenser using R513A. Therefore, the R513A replacement is acceptable according to the second law of thermodynamics.

ACS Style

Adrián Mota-Babiloni; J.M. Belman-Flores; Pavel Makhnatch; Joaquín Navarro-Esbrí; J.M. Barroso-Maldonado. Experimental exergy analysis of R513A to replace R134a in a small capacity refrigeration system. Energy 2018, 162, 99 -110.

AMA Style

Adrián Mota-Babiloni, J.M. Belman-Flores, Pavel Makhnatch, Joaquín Navarro-Esbrí, J.M. Barroso-Maldonado. Experimental exergy analysis of R513A to replace R134a in a small capacity refrigeration system. Energy. 2018; 162 ():99-110.

Chicago/Turabian Style

Adrián Mota-Babiloni; J.M. Belman-Flores; Pavel Makhnatch; Joaquín Navarro-Esbrí; J.M. Barroso-Maldonado. 2018. "Experimental exergy analysis of R513A to replace R134a in a small capacity refrigeration system." Energy 162, no. : 99-110.

Journal article
Published: 03 July 2018 in International Journal of Refrigeration
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This paper presents the theoretical analysis of the influence of an internal heat exchanger (IHX) position, on an ejection-compression refrigeration system. The energy and the exergy performance are discussed by placing an IHX in two different positions: 1) Promoting the superheating in the compressor suction EC+IHX-1 and 2) promoting superheating in the suction nozzle EC+IHX-2, which is a novel configuration proposal. Both configurations are compared under air climatization conditions using the refrigerants R134a, R1234ze(E) and R290. The results show that the exergy efficiency is higher when EC+IHX-2 is used for an IHX effectiveness below 60%, and lower irreversibilities occur in the ejector with this configuration for an effectiveness value of IHX below 40%. In both cases, IHX presence promotes a decrease in the coefficient of performance.

ACS Style

J.L. Rodríguez-Muñoz; V. Pérez-García; Juan Belman; Jean Fulbert Ituna Yudonago; A. Gallegos-Muñoz. Energy and exergy performance of the IHX position in ejector expansion refrigeration systems. International Journal of Refrigeration 2018, 93, 122 -131.

AMA Style

J.L. Rodríguez-Muñoz, V. Pérez-García, Juan Belman, Jean Fulbert Ituna Yudonago, A. Gallegos-Muñoz. Energy and exergy performance of the IHX position in ejector expansion refrigeration systems. International Journal of Refrigeration. 2018; 93 ():122-131.

Chicago/Turabian Style

J.L. Rodríguez-Muñoz; V. Pérez-García; Juan Belman; Jean Fulbert Ituna Yudonago; A. Gallegos-Muñoz. 2018. "Energy and exergy performance of the IHX position in ejector expansion refrigeration systems." International Journal of Refrigeration 93, no. : 122-131.