Cristina Alonso‐Tristán

Universidad de Burgos

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Co-Authors

M. Díez-Mediavilla

Universidad de Burgos

Juan Antonio González

Universidad de Valladolid

Isaiás García de la Fuenté

Universidad de Valladolid

M.I. Dieste-Velasco

Universidad de Burgos

T. García-Calderón

Universidad de Burgos

M.C. Rodríguez-Amigo

Universidad de Burgos

David González-Peña

Universidad de Burgos

Miguel de Simón‐Martín

Universidad de León

Makram T. Suidan

American University of Beirut

Eduardo Montero

National Bureau of Economic Research

Cooperative Institutions

Universidad de Burgos

Universidad de Valladolid

University of Cincinnati

Environmental Protection Agency

University of Almería

Universidad Complutense de Madrid

Universidad Politécnica de Madrid

American Society of Civil Engineers

Centro Universitario de la Defensa

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

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Liquid–Liquid Equilibria for Systems Containing 4-Phenylbutan-2-one or Benzyl Ethanoate and Selected Alkanes

Journal of Chemical & Engineering Data (2017)

Cristina Alonso‐Tristán Juan Antonio González Fernando Hevia Isaiás García de la Fuenté José Carlos Cobos

Liquid-liquid equilibrium (LLE) phase diagrams have been determined, by means of the critical opalescence method with a laser scattering technique, for the mixtures 4-phenylbutan-2-one + CH$_3$(CH$_2$)$_n$CH$_3$ ($n = 10,12,14$) and for benzyl ethanoate + CH$_3$(CH$_2$)$_n$CH$_3$ ($n = 12,14$). The systems are characterized by having an upper critical solution temperature (UCST), which increases with n. The corresponding LLE curves show a rather horizontal top and become skewed toward higher mole fractions of the polar compound when n is increased. Calorimetric and LLE measurements show that, for mixtures with molecules with a given functional group, interactions between aromatic molecules are stronger than those between homomorphic linear molecules (aromaticity effect). This has been ascribed to proximity effects arising from the presence of the polar group and the aromatic ring within the same molecule. Proximity effects become weaker in the sequence 1-phenylpropan-2-one > 4-phenylbutan-2-one > 1-phenylethanone and are more important in benzyl ethanoate than in ethyl benzoate molecules. Values of the critical compositions and temperatures calculated with the DISQUAC group contribution model are in good agreement with the experimental results. Accordingly, the shape of the LLE curves is also correctly described by DISQUAC.

Liquid liquid

Alkane

10.1021/acs.jced.6b00803

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Citations (7)

Exploitation of indoor illumination for typical flat dwellings in the Mediterranean area

Energy Reports (2023)

Diego Granados-López Damien Gatt Charles Yousif M. Díez-Mediavilla Cristina Alonso‐Tristán

The 2018/844 Energy Performance of Buildings Directive (EU) has widened the scope of appropriate design of buildings from a pure energy performance and carbon emissions perspective to a wider scope that includes indoor comfort, and indoor air quality among others. To this effect, external parameters, especially solar energy, have a strong impact on the energy performance of buildings in Mediterranean regions, which requires careful consideration when it comes to benefiting from natural lighting while avoiding solar overheating. This paper addresses the considerations of natural lighting in the deep renovation of a housing block in the Mediterranean climate of the Republic of Malta, comparing some of the usual illuminance ranges to achieve optimal conditions based on international recommendations. DesignBuilder v7.0.0.102 has been the selected software to model the building that has been calibrated through experimental measurements. The model enabled the natural lighting conditions in the building evaluated and the effectiveness of suggested improvements to be determined. Results pointed out that the building under study satisfies the international standards about the prevention of visual discomfort only. Increasing the size of windows in identified zones, especially the first floor, was found to help improve other natural lighting characteristics. One of the proposed designs (Model 6) that replaces single-glazed with double-glazed windows that include an external spectrally-selective coating would significantly improve access to natural light bringing the building closer to the recommended levels of Annual Sunlight Exposure and reducing artificial lighting usage by up to five times. The relocation of room spaces could also reduce the use of artificial lighting.

Overheating (electricity)

Facade

Scope (computer science)

10.1016/j.egyr.2022.12.085

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Citations (4)

Mejora del aprendizaje en ingeniería mediante nuevas tecnologías: simulador para el estudio del gas ideal en ingeniería térmica

Fernando Aguilar Romero Cristina Alonso‐Tristán Eduardo Montero

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Performance of global luminous efficacy models and proposal of a new model for daylighting in Burgos, Spain

Renewable Energy (2018)

M.I. Dieste-Velasco M. Díez-Mediavilla Diego Granados-López David González-Peña Cristina Alonso‐Tristán

Daylighting

Overcast

Daylight

Luminous efficacy

10.1016/j.renene.2018.10.085

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Citations (13)

DESIGN AND DEVELOPMENT OF A MECHATRONICS LEARNING KIT

ICERI proceedings (2018)

Laura Maestro García Diego Granados-López David González-Peña M.I. Dieste-Velasco M. Díez-Mediavilla

L. Maestro GarcíaD. Granados-LópezD. González-PeñaM.I. Dieste-VelascoM. Díez-MediavillaC. Rodríguez-AmigoT. García-CalderónC. Alonso-Tristán

Garcia

10.21125/iceri.2018.1582

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Citations (0)

Diseño y puesta en marcha de una micro-red de estaciones radiométricas en Castilla y León

Miguel de Simón‐Martín David González Peña Cristina Alonso‐Tristán M. Díez-Mediavilla

En la presente comunicacion se expone el diseno, configuracion, calibracion, particularidades y puesta en marcha de una micro-red de estaciones radiometricas situada en el centro de Castilla y Leon con objeto de mejorar la informacion climatica disponible y la caracterizacion del recurso solar en la zona. En la actualidad, la micro-red esta compuesta por dos estaciones ubicadas, una de ellas (estacion SWIFT0001) en la Escuela Politecnica Superior de Burgos (42.351oN, -3.688oW, 857 m.s.n.m.), y la otra (estacion SWIFT0002) en las instalaciones de una planta de produccion fotovoltaica en Astudillo, provincia de Palencia (42.202oN, -4.269oW, 813 m.s.n.m.). Uno de los principales aspectos novedosos de la micro-red, y que la diferencia de otras existentes, es que, aparte de incorporar dispositivos de medicion de variables climaticas convencionales, tales como temperatura ambiente en bulbo seco, humedad relativa, direccion y velocidad de viento, cantidad de agua precipitada o radiacion ...

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Excess Enthalpies of Binary and Ternary Mixtures Containing Dibutyl Ether, Cyclohexane, and 1-Butanol at 298.15 K

Journal of Chemical & Engineering Data (2009)

Fernando Aguilar Fatima E.M. Alaoui Cristina Alonso‐Tristán José J. Segovia Miguel A. Villamañán

Experimental excess enthalpies of the ternary system dibutyl ether (DBE) + cyclohexane + 1-butanol and the corresponding binary systems at 298.15 K are reported. A quasi-isothermal flow calorimeter has been built and tested to make the measurements. All the binary and the ternary systems show endothermic character. The experimental data have been fitted using a polynomial equation for the binary and ternary systems. The values of the standard deviation indicate good agreement between the experimental results and those calculated from the equation.

10.1021/je800751m

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Citations (23)

The effect of liquid phase on VOC removal in trickle-bed biofilters

Water Science & Technology (1998)

Xueqing Zhu Cristina Alonso‐Tristán Makram T. Suidan Hongwen Cao Byung J. Kim

The objective of this work was to analyze the effect of water content on the removal of volatile organic compounds (VOCs) in gas phase trickle-bed biofilters. Previous studies revealed that excessive accumulation of biomass in the reactor had a negative effect on contaminant removal efficiency. To solve this problem, periodic backwash was used to remove excess biomass and maintain an effective operation. Results showed that the ether removal efficiency dropped immediately after backwashing and gradually improved to reach the optimal value within about 24 hours. The initial drop in performance can be attributed to biological effects, such as loss of active biomass and the necessity for an adaptation period for the microbial culture. However, mass transfer limitations due to the water retained in the reactor may also be important. To investigate the effect of water content on the biofilter performance, an experiment evaluated the effect of draining after backwashing was conducted. Biofilters were allowed to drain for different periods of time before restarting the reactors. A longer lapse time in draining before the restart resulted in better ether removal efficiency. The improvement of biofilter performance after backwashing was explained with a combination of biological and physical effects. A mathematical model was then used to simulate the performance of the biofilter under these conditions and to support the conclusions obtained. The mathematical model considered a three-phase system (biofilm, water, and gas phase), dunamic processes, non-uniform bacterial population, and one limiting substrate.

TRICKLE

Biofilter

Trickle-bed reactor

Liquid phase

10.1016/s0273-1223(98)00557-5

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Citations (38)

Thermodynamics of amide+ketone mixtures. 1. Volumetric, speed of sound and refractive index data for N,N-dimethylformamide+2-alkanone systems at several temperatures

The Journal of Chemical Thermodynamics (2016)

Ana Cobos Fernando Hevia Juan Antonio González Isaiás García de la Fuenté Cristina Alonso‐Tristán

Speed of Sound

Amide

10.1016/j.jct.2016.02.016

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Citations (11)

Performance Indicators for Sun-Tracking Systems: A Case Study in Spain

Energy and Power Engineering (2014)

Miguel de Simón‐Martín Cristina Alonso‐Tristán M. Díez-Mediavilla

Current PV cells technology takes advantage mainly from beam radiation. In this context the sun-trackers are such devices for efficiency improvement. On the other hand, projected shadows between devices make mandatory to increase the distances between mounting systems. Thus, the land's capacity for mounting PV panels can be dramatically decreased. This fact conducts us to wonder where the optimum efficient point is. First, in this paper different types of sun-tracking systems are classified according to the movement they perform (cinematic classification). Further, three real PV installations-fixed, horizontal-axis tracking and dual-axis mount tracking—located in the same geographical area in Spain (they are approximately under the same weather conditions) are analyzed. These installations have been studied in order to establish which one is the most efficient and affordable—Specific Energy Production (SEP) and Performance Ratio (PR) analysis. PVGIS solar radiation estimate tool has been used for comparing the theoretical radiation potential on each plant. The land requirements have been considered in the analysis of the Ground Cover Ratio (GCR) and the Surface Performance Ratio (SPR). Moreover, comparing three main financial indicators let us carry out a financial study: Payback Time (PBT), Net Present Value (NPV) and Internal Rate of Return (IRR). In the case study, final annual energetic results demonstrate that the dual-axis plant shows a relevant SEP advantage, but if we take into account the land occupied for this sort of devices we find much more profitable the horizontal-axis sun-tracking system, with a SPR value 4.24% higher than the fixed system we have studied. Its PBT is also a 22% lower than the dual-axis tracking installation.

BitTorrent tracker

Payback period

Tracking (education)

Solar tracker

10.4236/epe.2014.69025

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Citations (22)