J. Serrano-Arellano

• Centro Nacional de Investigación y Desarrollo Tecnológico

Amaranth has many interesting features, both nutritional and otherwise, that make it attractive as a food crop. Plants grown in greenhouses have higher yields but lower nutritional value compared to those grown in open fields. This prompted an interest in studying viable elicitors for the production of amaranth. Small hydrogen peroxide (H2O2) conce...

Among the alternatives for improving the thermal comfort conditions inside buildings are the thermally activated building systems (TABS). They are embedded in different building components to improve the indoor air temperature. In this work, a review and analysis of the state of the art of TABS was carried out to identify their potential to improve...

When conceiving the project of a building, we understand that it will be interacting with the ground through a "soil-structure" system, and that it will be the appropriate interaction between the ground and the foundation that will guarantee functionality and stability from the geotechnical perspective as structural of the project. Today we identif...

This work describes a methodology to evaluate the lighting conditions present in a building (that is, from a theoretical and experimental perspective), as well as proposals for materials used in construction from a sustainable vision with the incorporation of screw caps and Styrofoam. On the other hand, a prototype proposal for a sewage sanitation...

Based on the impact of climate changes, our concern arises in this scenario and the entire building is exposed to different climatic agents such as the rain itself, which can negatively impact the overall performance of the construction. Waterproofing is an essential requirement for buildings for residential, commercial and industrial use. Aspects...

In this work, the evaluation of a solid block wall is presented to obtain an empirical model that relates the global heat transfer coefficient (U-value) with temperature and vapor pressure, the latter variable associated with relative humidity. To evaluate the hygrothermal behavior of the sample, a hot box was designed, built, and instrumented. The...

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 refrigera...

This work presents the design, construction, instrumentation and thermal evaluation of a single-channel solar chimney under a warm-humid climate. A solar chimney (0.8 m width and 2 m length) with a capacity for varying the air gap (0–0.28 m), the inclination angle (0 − 90°), and the amount of energy absorbed by the absorber plate. A parametric stud...

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 ana...

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...

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 approximate...

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 s...

Este trabajo presenta el dimensionamiento y análisis del acoplamiento, de un sistema de refrigeración de pequeña capacidad volumétrica (basado en la tecnología difusión-absorción) y un panel fotovoltaico, desde el punto de vista conceptual. El dimensionamiento se basó en condiciones de radiación solar del estado de Guanajuato con el fin de suminist...

Flow maldistribution represents a problem of particular interest in the engineering field for several thermal systems. In flat plate solar collectors, the thermal efficiency strongly depends on the flow distribution through the riser tubes, where a uniform distribution causes a uniform temperature distribution and therefore a higher efficiency. In...

The Amaranth is a plant considered as a third millennium crop due to its nutritional properties and its agronomic versatility. Amaranth (Amaranthus hypochondriacus L.) can be cultivated in greenhouses or the open field. Greenhouse cultivation provides better yields but may affect chemical composition. In this study we compared antioxidant capacity,...

This paper compares the heat transfer performance of two gas cooler configurations using CO2 as refrigerant. Straight gas cooler vs U-bend gas cooler was analyzed using 3D numerical simulation employing ANSYS FLUENT commercial program. The importance of the structure of the mesh was discussed and the unstructured sweep method was selected. Numerica...

In this study was analized the incorporation of some of the passive bioclimatic elements to the rural building for dampening the indoor temperature in the hot or cold seasons for the regions of the state of Hidalgo-Mexico that suffer from adverse weather conditions due to its geographical location. The homes in these areas are not usually planned o...

Amaranth can be cultivated in greenhouses or open fields. The aim of this study was to compare the basic chemical composition and growth parameters of Amaranthus hypochondriacus grown in a greenhouse in comparison to the open field. Each cropping system was assigned an experimental area of 100 m2. Cultivation was performed directly in irrigated fur...

This paper presents a numerical study of conjugate heat transfer between two air flows circulating in parallel pipelines. We analysed the buoyancy effect generated by the temperature gradient, by coupling the movement produced by the air flow forced through the entrances of the input ducts. The buoyancy effect favours a rapid transition to turbulen...

Transient behavior of internal heat exchanger (IHX) during start-up of transcritical refrigeration system is investigated in this paper. The work is focused on the local transient analysis of CO2 thermophysical properties, in order to see how these transient changes affect the heat transfer rate and the effectiveness of internal heat exchanger, as...

Numerical simulations are fundamental in the development of scientific knowledge due to their capability to quantitatively predict the behavior of key variables. However, the main obstacle is computational power, bounding the total computational times, which vary from a few minutes to impractical times of several years, implying the necessity to de...

A numerical analysis of the effect of heat conduction of different building materials on conjugate heat and mass transfer in a square cavity is presented. The air fluid inside the cavity is contaminated with Carbon Dioxide (CO2). The governing equations of mass, momentum, energy and concentration with a turbulent k-ε model were solved by the finite...

Numerical simulations are fundamental in the development of scientific knowledge due to their capability to quantitatively predict the behavior of key variables. However, the main obstacle is computational power, bounding the total computational times, which vary from a few minutes to impractical times of several years, implying the necessity to de...

In the next chapter, we will attempt to analyze the situation of the Mexican population based on the consequences brought on by the visible and current deterioration of the environment, from pre-Hispanic times to the present day. As we know, the environment, and more specifically, the degree of pollution, changes the mindset of every individual. Be...

A transient numerical study of heat and mass transfer by turbulent natural convection of an Air–Carbon Dioxide mixture (CO2) inside a ventilated cavity is presented. The working fluid is initially considered to be at rest at an initial temperature and concentration. The inlet air velocity is a function of the Reynolds number (5 × 102 ⩽ Re ⩽ 2 × 104...

A theoretical study to determine an optimal configuration for removal a CO2 contaminant from inside a room is presented. The geometry considered was a 2D ventilated cavity in turbulent flow regime and solving the governing equations of mass, momentum and chemical species by the finite volume method. The interval of Reynolds number under study was 0...

A theoretical study to determine an optimal configuration for removal a CO2 contaminant from inside a room is presented. The geometry considered was a 2D ventilated cavity in turbulent flow regime and solving the governing equations of mass, momentum and chemical species by the finite volume method. The interval of Reynolds number under study was 0...

Heat and mass transfer by natural convection in a square cavity with turbulent flow has been analyzed, covering a wide range of Rayleigh number of 104 6 Ra 6 1010 with a constant value of CH = 3000 ppm. A contaminant point source (CO2) is considered in five different positions inside the cavity. Governing equations of mass, energy and concentration...

A numerical study of conjugated heat (natural convection–thermal radiation) and mass transfer in a square cavity filled with a mixture of Air–CO2 is presented. The study was performed through laminar and turbulent regimes (104 ⩽ Ra ⩽ 1010). The cavity is differentially heated with two isothermal walls and two adiabatic. The hot wall is kept at a co...

A theoretical study of a room on top of a building with three different glazed configurations in Mexico City is presented. The research aims to show the advantages of using coupling models (CFD-BES) instead stand-alone solutions. The CFD model was simulated as a 2D cavity considering conjugate heat transfer and solving the governing equations by th...

Heat and mass transfer by natural convection in a square cavity filled with a mixture of air and carbon dioxide (CO2), as well as temperature and concentration gradients are numerically investigated. The study was conducted through laminar and turbulent regimes in order to analyze the influence of the buoyancy ratio changes (0 ⩽ N ⩽ 2.0) on heat tr...

Numerical results obtained from the analysis of the conjugated heat and mass transfer of an Air-Carbon Dioxide mixture (CO2) inside a ventilated cavity in turbulent flow regime are presented. Different configurations of the cavity were analyzed regarding the location of the mixture outlet gap in order to study the thermal behavior and the air quali...