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Dr. Iván Hernández-Pérez
Universidad Juárez Autónoma de Tabasco

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0 Building Simulation
0 Energy and Buildings
0 Building energy efficiency
0 Cool roofs
0 numerical heat transfer

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Journal article
Published: 06 April 2021 in Applied Sciences
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Building roofs are sources of unwanted heat for buildings situated in zones with a warm climate. Thus, reflective coatings have emerged as an alternative to reject a fraction of the solar energy received by roofs. In this research, the thermal behavior of concrete slab roofs with traditional and solar reflective coatings was simulated using a computational tool. The studied slab configurations belong to two groups, non-insulated and insulated roofs. In the second group, the thermal insulation thickness complies with the value recommended by a national building energy standard. Weather data from four cities in Mexico with a warm climate were used as boundary conditions for the exterior surface of the roofs. The computational tool consisted of a numerical model based on the finite volume method, which was validated with experimental data. A series of comparative simulations was developed, taking a gray roof as the control case. The results demonstrated that white roofs without insulation had an exterior surface temperature between 11 and 16 °C lower than the gray roof without insulation. Thus, the daily heat gain of these white roofs was reduced by a factor ranging between 41 and 54%. On the other hand, white roofs with insulation reduced the exterior surface temperature between 17 and 21 °C compared to the gray roof with insulation. This temperature reduction caused insulated white roofs to have a daily heat gain between 37 and 56% smaller than the control case. Another contribution of this research is the assessment of two retrofitting techniques when they are applied at once. In other words, a comparison between a non-insulated gray roof and an insulated white roof revealed that the latter roof had a daily heat gain up to 6.4-times smaller than the first.

ACS Style

Iván Hernández-Pérez. Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico. Applied Sciences 2021, 11, 3263 .

AMA Style

Iván Hernández-Pérez. Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico. Applied Sciences. 2021; 11 (7):3263.

Chicago/Turabian Style

Iván Hernández-Pérez. 2021. "Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico." Applied Sciences 11, no. 7: 3263.

Preprint
Published: 02 March 2021
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Building roofs are sources of unwanted heat for buildings situated in zones with a warm climate. Thus, reflective coatings have emerged as an alternative to reject a significant fraction of solar energy received by roofs. In this research, the thermal behavior of concrete slab-type roofs with traditional and solar reflective coatings was simulated using a computational tool. Weather data from four cities in Mexico with a warm climate were used as boundary conditions. This tool is an in-house code based on the Finite Volume Method developed by the author to perform building components simulations. The code was validated with experimental data from previous work. A series of comparative simulations were developed, taking a gray roof as a control case. The results showed that for the roof without thermal insulation (single roof), the solar reflective coatings reduced the exterior surface between 11 and 16∘C. Consequently, the single roofs’ daily heat gain was reduced by a factor ranging between 41 and 54%. On the other hand, for the insulated roof, the reflective coatings reduced the exterior surface temperature between 17 and 21∘C. At the same time, the daily heat gain of composite roofs was reduced between 37 and 56%.

ACS Style

Iván Hernández-Pérez. Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico. 2021, 1 .

AMA Style

Iván Hernández-Pérez. Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico. . 2021; ():1.

Chicago/Turabian Style

Iván Hernández-Pérez. 2021. "Influence of Traditional and Solar Reflective Coatings on the Heat Transfer of Building Roofs in Mexico." , no. : 1.

Journal article
Published: 13 August 2020 in Journal of Building Engineering
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In this paper, the heat transfer in a concrete roof with an intermediate layer of PCM was studied numerically. Three positions and three thicknesses of the PCM layer and two values of solar absorptance (gray and white) of the roof were evaluated. The period studied was a typical summer week of a city in Mexico with warm humid weather. The interior boundary was in contact with the indoor air at a constant temperature. The unsteady two-dimensional model was solved by the Finite Volume Method using an implicit scheme. For the gray roof, the greatest reduction in the temperature of the interior surface (6.4⋄C) and in the heat gains (22.2%) was obtained when a PCM layer with a thickness of 2 cm is close to the interior surface. For the white roof, the results of the maximum temperatures of the interior surface and the heat gains between the different thicknesses and positions of the PCM layer showed negligible differences. However, the melting cycles of the PCM layer were affected as it was closer to the interior surface of the roof, and its thickness increased. The incorporation of a white reflective coating reduced the maximum interior surface temperature and the cooling load by 14.7–15.4⋄C, and 58.1–62.7%, respectively.

ACS Style

J. Triano-Juárez; E.V. Macias-Melo; I. Hernández-Pérez; K.M. Aguilar-Castro; J. Xamán. Thermal behavior of a phase change material in a building roof with and without reflective coating in a warm humid zone. Journal of Building Engineering 2020, 32, 101648 .

AMA Style

J. Triano-Juárez, E.V. Macias-Melo, I. Hernández-Pérez, K.M. Aguilar-Castro, J. Xamán. Thermal behavior of a phase change material in a building roof with and without reflective coating in a warm humid zone. Journal of Building Engineering. 2020; 32 ():101648.

Chicago/Turabian Style

J. Triano-Juárez; E.V. Macias-Melo; I. Hernández-Pérez; K.M. Aguilar-Castro; J. Xamán. 2020. "Thermal behavior of a phase change material in a building roof with and without reflective coating in a warm humid zone." Journal of Building Engineering 32, no. : 101648.

Journal article
Published: 01 August 2020 in Journal of Energy Engineering
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ACS Style

Sergio Ledesma; I. Hernández-Pérez; J. M. Belman-Flores; J. A. Alfaro-Ayala; J. Xamán; Pascal Fallavollita. Using Artificial Intelligence to Analyze the Thermal Behavior of Building Roofs. Journal of Energy Engineering 2020, 146, 04020022 .

AMA Style

Sergio Ledesma, I. Hernández-Pérez, J. M. Belman-Flores, J. A. Alfaro-Ayala, J. Xamán, Pascal Fallavollita. Using Artificial Intelligence to Analyze the Thermal Behavior of Building Roofs. Journal of Energy Engineering. 2020; 146 (4):04020022.

Chicago/Turabian Style

Sergio Ledesma; I. Hernández-Pérez; J. M. Belman-Flores; J. A. Alfaro-Ayala; J. Xamán; Pascal Fallavollita. 2020. "Using Artificial Intelligence to Analyze the Thermal Behavior of Building Roofs." Journal of Energy Engineering 146, no. 4: 04020022.

Journal article
Published: 10 April 2020 in Mechanics & Industry
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In this paper, the thermal and ventilation potential of a geothermal Earth-to-Air Heat exchanger (EAHE) is studied for six weather in Mexico. The cities for the study and their climate were Villahermosa (hot-humid), Merida (hot-sub humid), Monterrey (dry), Juarez City (very dry), Zacualtipan-Hidalgo (warm-humid) and Mexico City (warm-sub-humid). The thermal behavior of the EAHE was modeled numerically for the corresponding warmest and coldest days of the year for each city and three values of Reynolds number. The 24 hrs simulations were carried out with an in-house code using data every 10 minutes. To get the results, 5,184 computational runs were necessary. The results showed that the EAHE has poor ventilation potential for climates with high levels of humidity such as Villahermosa, while for cities with low levels of humidity such as Chihuahua, the ventilation potential increases significantly, the rest of the cities fall in between. As for its application in Mexico, the results show that the EAHE is highly recommended for dry climates such as at the north of the country and not recommended for humid climates such as at the south and south-east of the country.

ACS Style

M. Rodríguez-Vázquez; J. Xamán; Y. Chávez; I. Hernández-Pérez; E. Simá. Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México. Mechanics & Industry 2020, 21, 308 .

AMA Style

M. Rodríguez-Vázquez, J. Xamán, Y. Chávez, I. Hernández-Pérez, E. Simá. Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México. Mechanics & Industry. 2020; 21 (3):308.

Chicago/Turabian Style

M. Rodríguez-Vázquez; J. Xamán; Y. Chávez; I. Hernández-Pérez; E. Simá. 2020. "Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México." Mechanics & Industry 21, no. 3: 308.

Journal article
Published: 01 March 2020 in Geothermics
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This work presents an experimental study of an Earth-Air Heat Exchanger (EAHE) under a warm humid weather conditions of Mexico. The EAHE has a horizontal configuration with three sections of 101.6 mm diameter PVC pipe, a horizontal pipe of 6 m long and two vertical sections of 3 m long for the inlet and outlet sections. It was buried at 2.5 m and to improve the performance of the EAHE, the outlet section was thermally insulated. We monitored for 6 months the soil temperature from 0 to 2.5 m in intervals of 0.25 m, and the air temperature at the inlet and the outlet. Specific heat was determined for five samples of soil analyzed using thermogravimetry. The average temperature of the soil at 2.5 m depth remained between 27–28C, and the obtained specific heat of the soil ranged between 0.726 and 0.910 JgK showing a homogeneous behavior. The EAHE behaved as a cooler during the day and as a heater at night, except in the winter season that worked most of the time as a heater. The EAHE had a temperature difference as a cooler of 5.5 C. The maximum energy removed as a cooler was of 4.438 kWh for August. The results show that with the EAHE it is possible to cool an airflow under humid-warm weather conditions.

ACS Style

Heidi Paola Díaz Hernández; Edgar Macías Melo; Karla Aguilar Castro; Ivan Hernández Pérez; Jesús Xamán; J. Serrano Arellano; Luis Manuel Lopez Manrique. Experimental study of an earth to air heat exchanger (EAHE) for warm humid climatic conditions. Geothermics 2020, 84, 1 .

AMA Style

Heidi Paola Díaz Hernández, Edgar Macías Melo, Karla Aguilar Castro, Ivan Hernández Pérez, Jesús Xamán, J. Serrano Arellano, Luis Manuel Lopez Manrique. Experimental study of an earth to air heat exchanger (EAHE) for warm humid climatic conditions. Geothermics. 2020; 84 ():1.

Chicago/Turabian Style

Heidi Paola Díaz Hernández; Edgar Macías Melo; Karla Aguilar Castro; Ivan Hernández Pérez; Jesús Xamán; J. Serrano Arellano; Luis Manuel Lopez Manrique. 2020. "Experimental study of an earth to air heat exchanger (EAHE) for warm humid climatic conditions." Geothermics 84, no. : 1.

Research article
Published: 02 February 2020 in Journal of Building Physics
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Building energy simulations coupled with computational fluid dynamics tools have emerged, recently, as an accurate and effective tool to improve the estimation of energy requirements and thermal comfort in buildings. Building modelers and researchers usually implement this coupling in the boundary conditions of both tools (e.g. surface temperature, ambient temperature, and conductive and convective fluxes). This work reviews how the building energy simulation–computational fluid dynamics coupling has evolved since its first implementation to the present day. Moreover, this article also summarizes and discusses the research studies in which the building energy simulation–computational fluid dynamics coupling has been used to analyze building systems, building components, and building urban configurations. Implementing a building energy simulation–computational fluid dynamics coupling brings a series of benefits when compared with the conventional building energy simulation methodology, a building energy simulation–computational fluid dynamics coupling provides an improvement that ranges between 10% and 50% for estimating the building energy requirements. Moreover, the computation time to implement computational fluid dynamics with information obtained from the building energy simulation could be reduced by as well.

ACS Style

Martin Rodríguez-Vázquez; Iván Hernández-Pérez; Jesus Xamán; Yvonne Chávez; Miguel Gijón-Rivera; Juan M Belman-Flores. Coupling building energy simulation and computational fluid dynamics: An overview. Journal of Building Physics 2020, 44, 137 -180.

AMA Style

Martin Rodríguez-Vázquez, Iván Hernández-Pérez, Jesus Xamán, Yvonne Chávez, Miguel Gijón-Rivera, Juan M Belman-Flores. Coupling building energy simulation and computational fluid dynamics: An overview. Journal of Building Physics. 2020; 44 (2):137-180.

Chicago/Turabian Style

Martin Rodríguez-Vázquez; Iván Hernández-Pérez; Jesus Xamán; Yvonne Chávez; Miguel Gijón-Rivera; Juan M Belman-Flores. 2020. "Coupling building energy simulation and computational fluid dynamics: An overview." Journal of Building Physics 44, no. 2: 137-180.

Journal article
Published: 01 February 2020 in Energy and Buildings
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ACS Style

A. Ávila-Hernández; E. Simá; J. Xamán; Iván Hernández-Pérez; E. Téllez-Velázquez; M.A. Chagolla-Aranda. Test box experiment and simulations of a green-roof: Thermal and energy performance of a residential building standard for Mexico. Energy and Buildings 2020, 209, 1 .

AMA Style

A. Ávila-Hernández, E. Simá, J. Xamán, Iván Hernández-Pérez, E. Téllez-Velázquez, M.A. Chagolla-Aranda. Test box experiment and simulations of a green-roof: Thermal and energy performance of a residential building standard for Mexico. Energy and Buildings. 2020; 209 ():1.

Chicago/Turabian Style

A. Ávila-Hernández; E. Simá; J. Xamán; Iván Hernández-Pérez; E. Téllez-Velázquez; M.A. Chagolla-Aranda. 2020. "Test box experiment and simulations of a green-roof: Thermal and energy performance of a residential building standard for Mexico." Energy and Buildings 209, no. : 1.

Journal article
Published: 22 January 2020 in Engineering Computations
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Purpose The purpose of this study is to propose a novel relaxation modified factor to accelerate the numerical solution of the radiative transfer equation (RTE) with several high-resolution total variation diminishing schemes. The methodology proposed is denoted as the X-factor method. Design/methodology/approach The X-factor method was compared with the technique deferred-correction (DC) for the calculations of a two-dimensional cavity with absorting-emiting-scatteting gray media using the discrete ordinates method. Four parameters were considered to evaluate: the absorption coefficient, the emissivity of boundary surface, the scattering albedo and under-relaxation factor. Findings The results showed the central processing unit (CPU) time of X-factor method was lower than DC. The reductions of CPU time with the X-factor method were observed from 0.6 to 75.4%. Originality/value The superiority of the X-factor method over DC was showed with the reduction of CPU time of the numerical solution of RTE for evaluated cases.

ACS Style

Carlos Enrique Torres-Aguilar; Jesús Xamán; Pedro Moreno-Bernal; Iván Hernández-Pérez; Ivett Zavala-Guillén; Irving Hernández-López. Acceleration of the numerical solution for the radiative transfer equation using a modified relaxation factor. Engineering Computations 2020, 37, 1823 -1847.

AMA Style

Carlos Enrique Torres-Aguilar, Jesús Xamán, Pedro Moreno-Bernal, Iván Hernández-Pérez, Ivett Zavala-Guillén, Irving Hernández-López. Acceleration of the numerical solution for the radiative transfer equation using a modified relaxation factor. Engineering Computations. 2020; 37 (5):1823-1847.

Chicago/Turabian Style

Carlos Enrique Torres-Aguilar; Jesús Xamán; Pedro Moreno-Bernal; Iván Hernández-Pérez; Ivett Zavala-Guillén; Irving Hernández-López. 2020. "Acceleration of the numerical solution for the radiative transfer equation using a modified relaxation factor." Engineering Computations 37, no. 5: 1823-1847.

Journal article
Published: 24 December 2019 in Renewable Energy
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The thermal performance of a concrete roof with a phase change material (PCM) layer on its interior surface under a Mexican warm weather (Merida) is presented. We analyzed a roof with three types of PCM: Paraffin wax - MG29 (R-PCM1), N-Eicosane (R-PCM2), and Salt Hydrates (R-PCM3). We also considered different thickness of the PCM layer. A conventional concrete roof (R–C) was considered as a reference to compare the results. The numerical simulations were conducted during the warmest and the coldest days of the year. A numerical in-house code was developed, and it was verified by solving reference solutions, obtaining good agreement. The results indicate that the case R-PCM1 with 2 cm of PCM layer had the lowest values of thermal load during the coldest (204.5 W h m−2) and the warmest day (610.7 W h m−2); such values are up to 57% lower than the thermal load corresponding to the R–C. The use of R-PCM1 with 2 cm of PCM-layer in Merida city will have a payback period of 12.18 years, Taking into account that buildings in Mexico have a 30-year ordinary service life, the use of these materials is cost-effective. Therefore, it is recommended the R-PCM1 to improve the thermal behavior of buildings located in Merida.

ACS Style

J. Xamán; A. Rodriguez-Ake; I. Zavala-Guillén; I. Hernández-Pérez; J. Arce; D. Sauceda. Thermal performance analysis of a roof with a PCM-layer under Mexican weather conditions. Renewable Energy 2019, 149, 773 -785.

AMA Style

J. Xamán, A. Rodriguez-Ake, I. Zavala-Guillén, I. Hernández-Pérez, J. Arce, D. Sauceda. Thermal performance analysis of a roof with a PCM-layer under Mexican weather conditions. Renewable Energy. 2019; 149 ():773-785.

Chicago/Turabian Style

J. Xamán; A. Rodriguez-Ake; I. Zavala-Guillén; I. Hernández-Pérez; J. Arce; D. Sauceda. 2019. "Thermal performance analysis of a roof with a PCM-layer under Mexican weather conditions." Renewable Energy 149, no. : 773-785.

Review
Published: 11 December 2019 in Energy & Environment
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In this study, we present a review of articles that address the state of the art in wind energy from different perspectives, specifically focusing on the criteria used for wind energy assessment and wind turbine standards, along with an overview of the technologies necessary to make reliable Wind Power-Grid penetration more efficient. Wind power dynamics are also considered from the perspective of their intermittency and the nature of wind speed variability in order to establish appropriate sampling times for measurements and monitoring. The literature discussed is representative of the technological and methodological advances dedicated to the development, adaptation and application of statistical, computational, numerical and artificial intelligence tools for an assessment of wind energy and wind power forecasting. These applications and methodologies commonly use data registers measured in very short, short, medium and long-term measurement campaigns. Finally, literature on wind power social, environmental and economic policies and trends in costs-capacity-addition and their impact are reviewed from a global perspective. In light of today’s concerns with global warming, it is essential that wind energy interact steadily on the grid with experienced operators and high automatic-control technology worldwide.

ACS Style

Lm López-Manrique; Ev Macias-Melo; Km Aguilar-Castro; Iván Hernández-Pérez; Hp Díaz-Hernández. Review on methodological and normative advances in assessment and estimation of wind energy. Energy & Environment 2019, 32, 25 -61.

AMA Style

Lm López-Manrique, Ev Macias-Melo, Km Aguilar-Castro, Iván Hernández-Pérez, Hp Díaz-Hernández. Review on methodological and normative advances in assessment and estimation of wind energy. Energy & Environment. 2019; 32 (1):25-61.

Chicago/Turabian Style

Lm López-Manrique; Ev Macias-Melo; Km Aguilar-Castro; Iván Hernández-Pérez; Hp Díaz-Hernández. 2019. "Review on methodological and normative advances in assessment and estimation of wind energy." Energy & Environment 32, no. 1: 25-61.

Journal article
Published: 01 November 2019 in Energy
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ACS Style

I. Hernández-Pérez; I. Zavala-Guillén; J. Xamán; J.M. Belman-Flores; E.V. Macias-Melo; K.M. Aguilar-Castro. Test box experiment to assess the impact of waterproofing materials on the energy gain of building roofs in Mexico. Energy 2019, 186, 115847 .

AMA Style

I. Hernández-Pérez, I. Zavala-Guillén, J. Xamán, J.M. Belman-Flores, E.V. Macias-Melo, K.M. Aguilar-Castro. Test box experiment to assess the impact of waterproofing materials on the energy gain of building roofs in Mexico. Energy. 2019; 186 ():115847.

Chicago/Turabian Style

I. Hernández-Pérez; I. Zavala-Guillén; J. Xamán; J.M. Belman-Flores; E.V. Macias-Melo; K.M. Aguilar-Castro. 2019. "Test box experiment to assess the impact of waterproofing materials on the energy gain of building roofs in Mexico." Energy 186, no. : 115847.

Journal article
Published: 12 June 2019 in Renewable Energy
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An assessment of the thermal behavior of a room with a Solar Façade (SF) for ventilation under the tropical wet climate of the Mexican southeast zone is presented. Both a summer day and a winter day of Mérida Yucatán were considered. The effects of the size of the vents, thickness of the wall, channel width, location of the inlet air and the material of the wall were analyzed to obtain the optimal configuration of the SF. The optimal configuration was considered to simulate the thermal behavior of the SF considering two-dimensional flow. Results indicate that SF removed enough energy from the room to reduce the average temperature of the indoor air up to 9.1 °C compared to the ambient temperature. For the winter day, from 8 to 14 h, the SF increased the temperature of the indoor air on average 1 °C. According to the standard ASHRAE 62.2, the SF complies the ventilation requirements during 8 h. In addition, the natural ventilation supplied by the SF allows to reduce an electricity consumption equivalent to a fan shaft power up to 0.693 kWh per day. Based on the results, SF is highly recommended to be used in the Mexican southeast zone.

ACS Style

I. Hernández-López; J. Xamán; I. Zavala-Guillén; I. Hernández-Pérez; P. Moreno-Bernal; Y. Chávez. Thermal performance of a solar façade system for building ventilation in the southeast of Mexico. Renewable Energy 2019, 145, 294 -307.

AMA Style

I. Hernández-López, J. Xamán, I. Zavala-Guillén, I. Hernández-Pérez, P. Moreno-Bernal, Y. Chávez. Thermal performance of a solar façade system for building ventilation in the southeast of Mexico. Renewable Energy. 2019; 145 ():294-307.

Chicago/Turabian Style

I. Hernández-López; J. Xamán; I. Zavala-Guillén; I. Hernández-Pérez; P. Moreno-Bernal; Y. Chávez. 2019. "Thermal performance of a solar façade system for building ventilation in the southeast of Mexico." Renewable Energy 145, no. : 294-307.

Journal article
Published: 15 February 2019 in Measurement
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In this work, a multi-gene genetic programming (MGGP) approach was implemented to predict the heat gain per square meter for flat naturally ventilated roof using experimental data set. Experiments were conducted using a test cell with an adjustable ventilated roof, designed and instrumented to measure the incoming heat flux under outdoor environmental conditions. An MGGP predictive model was trained and tested considering as input data: ambient air temperature, solar irradiation, wind speed, relative humidity, and different ventilated flat roof channel widths. The developed model was statistically compared with others multivariate analysis methods, achieving good statistical performance, high correlation fitness, and the best generalized performance capacity (RMSE = 3.74, R2 = 94.52% for training data and RMSE = 3.72, R2 = 94.30% for testing data). In addition, a sensitivity analysis was conducted to identify the relative importance of the input parameters in the predictive model. According to the results, the proposed methodology based on evolutionary programming is useful to model the complex nonlinear relationship between the ventilated roof heat gains and outdoor environment. Finally, the methodology based on MGGP can be applied to identify the adequate ventilated channel widths that ensure thermal comfort and energy saving.

ACS Style

Oscar May Tzuc; Iván Hernández-Pérez; E.V. Macias-Melo; A. Bassam; J. Xamán; B. Cruz. Multi-gene genetic programming for predicting the heat gain of flat naturally ventilated roof using data from outdoor environmental monitoring. Measurement 2019, 138, 106 -117.

AMA Style

Oscar May Tzuc, Iván Hernández-Pérez, E.V. Macias-Melo, A. Bassam, J. Xamán, B. Cruz. Multi-gene genetic programming for predicting the heat gain of flat naturally ventilated roof using data from outdoor environmental monitoring. Measurement. 2019; 138 ():106-117.

Chicago/Turabian Style

Oscar May Tzuc; Iván Hernández-Pérez; E.V. Macias-Melo; A. Bassam; J. Xamán; B. Cruz. 2019. "Multi-gene genetic programming for predicting the heat gain of flat naturally ventilated roof using data from outdoor environmental monitoring." Measurement 138, no. : 106-117.

Research article
Published: 03 February 2019 in Journal of Building Physics
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This work presents the design, construction, and instrumentation of a calorimeter with solar tracking to determine the thermal and optical properties of monolithic glass samples of 15 cm × 15 cm with a maximum thickness of 6 mm. The calorimeter was designed considering an abstract methodology, where the materials, for each of its components, were selected from an evaluation considering its properties and its criteria of functionality. The prototype was constructed and instrumented to quantify the heat losses through each of its walls. The prototype was calibrated to obtain the uncertainty of the heat flows, considering the heat gains and heat losses of the system. The results of the calibration allowed to obtain the uncertainty in the measurement of the heat flow that was estimated as ±0.446 W. On the other hand, to verify the operation of the solar calorimeter, we determined the U-value and solar heat gain coefficient for a 3-mm clear glass sample. The average values obtained for U and solar heat gain coefficient were 6.95 ± 0.9 W m−2 K−1 and 0.803 ± 0.03, respectively. These values were compared with values reported in the literature, and they have a maximum difference of 7.7%. The uncertainty obtained in the calibration and the values of the characteristic parameters indicate that the solar calorimeter is adequate to obtain the characteristic parameters of monolithic glass samples with optical characteristics similar to the samples of this study.

ACS Style

Enrique Hernández-Garfias; Edgar Vicente Macias-Melo; Karla María Aguilar-Castro; Iván Hernández-Pérez; Juan Serrano-Arellano; Laura Lorena Diaz-Flores. Development of a solar calorimeter for the thermal evaluation of glazing samples. Journal of Building Physics 2019, 42, 750 -770.

AMA Style

Enrique Hernández-Garfias, Edgar Vicente Macias-Melo, Karla María Aguilar-Castro, Iván Hernández-Pérez, Juan Serrano-Arellano, Laura Lorena Diaz-Flores. Development of a solar calorimeter for the thermal evaluation of glazing samples. Journal of Building Physics. 2019; 42 (6):750-770.

Chicago/Turabian Style

Enrique Hernández-Garfias; Edgar Vicente Macias-Melo; Karla María Aguilar-Castro; Iván Hernández-Pérez; Juan Serrano-Arellano; Laura Lorena Diaz-Flores. 2019. "Development of a solar calorimeter for the thermal evaluation of glazing samples." Journal of Building Physics 42, no. 6: 750-770.

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.

Review article
Published: 22 January 2019 in Energy and Buildings
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The solar chimney is one concept explored by building engineers and designers for reducing heat gain and inducing natural cooling in both commercial and residential buildings. In this sense, scientists around the world have developed significant research on solar chimneys since the 1990s. This review presents the studies related to the numerical thermal modeling of both, conventional solar chimneys and solar chimneys with phase change materials (PCM). The article focuses on two research areas: Computational Fluid Dynamics (CFD) and Global Energy Balance (GEB). Based on the literature, the CFD approach has become a powerful tool to investigate several aspects concerning the heat transfer mechanisms in a solar chimney. Additionally, the analysis of the literature showed that few calculation tools based on CFD transient state models of solar chimneys are available because the computational time required to solve these models could be excessive and impractical. Therefore, the use of high-performance computing (HPC) will be necessary to continue using CFD. On the contrary, the GEB models predict the transient behavior of these systems in short times, and one can integrate them in Building Energy Simulation programs. However, the literature about the solar chimney modeling using GEB shows that the transient mathematical model with PCM (six research papers) has been less used than the steady-state model. In general, results of a solar chimney using a PCM show that the temperature variation of PCM and air in the chimney were available for the natural ventilation in evening and night periods. Finally, this review paper is a reference for future research into the field of solar chimneys with a PCM and its applications.

ACS Style

C. Jiménez-Xamán; J. Xamán; Nelson O. Moraga; I. Hernández-Pérez; I. Zavala-Guillén; J. Arce; M.J. Jiménez. Solar chimneys with a phase change material for buildings: An overview using CFD and global energy balance. Energy and Buildings 2019, 186, 384 -404.

AMA Style

C. Jiménez-Xamán, J. Xamán, Nelson O. Moraga, I. Hernández-Pérez, I. Zavala-Guillén, J. Arce, M.J. Jiménez. Solar chimneys with a phase change material for buildings: An overview using CFD and global energy balance. Energy and Buildings. 2019; 186 ():384-404.

Chicago/Turabian Style

C. Jiménez-Xamán; J. Xamán; Nelson O. Moraga; I. Hernández-Pérez; I. Zavala-Guillén; J. Arce; M.J. Jiménez. 2019. "Solar chimneys with a phase change material for buildings: An overview using CFD and global energy balance." Energy and Buildings 186, no. : 384-404.

Review
Published: 26 December 2018 in Energy
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The solar chimney is one concept currently explored by scientists and designers for reducing heat gain and inducing natural cooling in both commercial and residential buildings. Solar chimneys can be installed on the building walls and roofs. In this sense, a significant amount of research work has been done on solar chimney since the 1990s. This paper presents an overview of transient mathematical models for solar chimneys with/without a phase change material. The review focuses on the Global Energy Balance (GEB) models and a short description of the main works is reported. The analysis of the literature on the solar chimney modeling using GEBhighlights that the transient mathematical model are scarce, from the authors' knowledge, there are only 24 published works and only six studies incorporated a phase change material (PCM) in a solar chimney. Five steady mathematical models available in the literature were analyzed, as well as the advantages and disadvantages of each model. Based on the analysis, it is concluded that the model - III and model - V are more appropriate to model the transient state with respect to the remaining models, and therefore the unsteady mathematical model –III and model - V were developed and shown. These models are highly recommended to be implemented as a solar chimney model in a Building Energy Simulation (BES) program. Finally, we propose a new transient mathematical model for a double-channel solar chimney, which incorporated a phase change material (PCM). This new mathematical model allows building designers and engineers to predict the potential benefit that a solar chimney with PCMmay have for ventilation. Therefore, this paper would provide a valuable reference for further research into the field of solar chimneys with a PCMand its applications.

ACS Style

R. Vargas-López; J. Xamán; I. Hernández-Pérez; J. Arce; I. Zavala-Guillén; M.J. Jiménez; M.R. Heras. Mathematical models of solar chimneys with a phase change material for ventilation of buildings: A review using global energy balance. Energy 2018, 170, 683 -708.

AMA Style

R. Vargas-López, J. Xamán, I. Hernández-Pérez, J. Arce, I. Zavala-Guillén, M.J. Jiménez, M.R. Heras. Mathematical models of solar chimneys with a phase change material for ventilation of buildings: A review using global energy balance. Energy. 2018; 170 ():683-708.

Chicago/Turabian Style

R. Vargas-López; J. Xamán; I. Hernández-Pérez; J. Arce; I. Zavala-Guillén; M.J. Jiménez; M.R. Heras. 2018. "Mathematical models of solar chimneys with a phase change material for ventilation of buildings: A review using global energy balance." Energy 170, no. : 683-708.

Journal article
Published: 15 December 2018 in Applied Thermal Engineering
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This research presents a thermal evaluation of an absorber-partitioned air channel solar chimney (SC-AP) to determine its feasibility as a building ventilation system in a warm-humid weather. Hourly climatic data from the coldest and the warmest days of each month of 2014 were used to assess the behavior of the SC-AP in Mérida, México. A numerical code based on the Finite Volume Method was developed to evaluate the ventilation potential of the SC-AP. The results indicate that the average mass flow rate of the coldest day is greater than the one corresponding to the warmest day in most of the months; therefore, even under the worst conditions of the year, the SC-AP extracted an average mass flow rate of 0.0832 kg/s. In addition, when the SC-AP is attached to a building, it is able to generate between 7.9 and 11.4 ACH for a residential bedroom of 27 m3 and more than 3.5 ACH for a classroom of 54 m3 during the hours with solar irradiance along the year, those values comply with the requirements recommended by ASHRAE.

ACS Style

I. Zavala-Guillén; J. Xamán; I. Hernández-Pérez; I. Hernández-Lopéz; C. Jiménez-Xamán; P. Moreno-Bernal; D. Sauceda. Ventilation potential of an absorber-partitioned air channel solar chimney for diurnal use under Mexican climate conditions. Applied Thermal Engineering 2018, 149, 807 -821.

AMA Style

I. Zavala-Guillén, J. Xamán, I. Hernández-Pérez, I. Hernández-Lopéz, C. Jiménez-Xamán, P. Moreno-Bernal, D. Sauceda. Ventilation potential of an absorber-partitioned air channel solar chimney for diurnal use under Mexican climate conditions. Applied Thermal Engineering. 2018; 149 ():807-821.

Chicago/Turabian Style

I. Zavala-Guillén; J. Xamán; I. Hernández-Pérez; I. Hernández-Lopéz; C. Jiménez-Xamán; P. Moreno-Bernal; D. Sauceda. 2018. "Ventilation potential of an absorber-partitioned air channel solar chimney for diurnal use under Mexican climate conditions." Applied Thermal Engineering 149, no. : 807-821.

Journal article
Published: 18 November 2018 in Energies
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This work studies the characteristics of the wind resource for a location in the north zone of Tehuantepec isthmus. The study was conducted using climatic data from Cuauhtemotzin, Mexico, measured at different altitudes above the ground level. The measured data allowed establishing the profile of wind speeds as well as the analysis of its availability. Analysis results conclude that the behavior of the wind speed presents a bimodal distribution with dominant northeast wind direction (wind flow of sea–land). In addition, the area was identified as feasible for the use of low speed power wind turbines. On the other hand, the application of a new approach for very short-term wind speed forecast (10 min) applying multi-gene genetic programming and global sensitivity analysis is also presented. Using a computational methodology, an exogenous time series with fast computation time and good accuracy was developed for the forecast of the wind speed. The results presented in this work complement the panorama for the evaluation of the resource in an area recognized worldwide for its vast potential for wind power.

ACS Style

Luis M. López-Manrique; E. V. Macias-Melo; O. May Tzuc; A. Bassam; K. M. Aguilar-Castro; I. Hernández-Pérez. Assessment of Resource and Forecast Modeling of Wind Speed through An Evolutionary Programming Approach for the North of Tehuantepec Isthmus (Cuauhtemotzin, Mexico). Energies 2018, 11, 3197 .

AMA Style

Luis M. López-Manrique, E. V. Macias-Melo, O. May Tzuc, A. Bassam, K. M. Aguilar-Castro, I. Hernández-Pérez. Assessment of Resource and Forecast Modeling of Wind Speed through An Evolutionary Programming Approach for the North of Tehuantepec Isthmus (Cuauhtemotzin, Mexico). Energies. 2018; 11 (11):3197.

Chicago/Turabian Style

Luis M. López-Manrique; E. V. Macias-Melo; O. May Tzuc; A. Bassam; K. M. Aguilar-Castro; I. Hernández-Pérez. 2018. "Assessment of Resource and Forecast Modeling of Wind Speed through An Evolutionary Programming Approach for the North of Tehuantepec Isthmus (Cuauhtemotzin, Mexico)." Energies 11, no. 11: 3197.