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A flexible and time-efficient schedule-based communication tool for integrated lighting and thermal simulations of spaces with controlled artificial lighting and complex fenestration systems
(2016) Vera Araya, Sergio Eduardo; Bustamante Gómez, Waldo; Molina, G.; Uribe, D.; CEDEUS (Chile)
A long panel survey to elicit variation in preferences and attitudes in the choice of electric vehicles
(2014) Jensen, A.; Cherchi, E.; Ortúzar Salas, Juan de Dios; CEDEUS (Chile)
A novel stomatal resistance equation for modeling heat and mass transfer of extensive vegetative roofs
(Elsevier GMBH, 2024) Rojas Mondaca, Aldo Nicolás; Steinfort Needham, Úrsula Carla; Vera Araya, Sergio Eduardo; CEDEUS (Chile)
The cooling potential of vegetated roofs depends on the stomatal resistance (rs), leaf area index, and other factors. Sailor (2008) and Tabares-Velasco and Srebric (2012) are among the most cited heat and mass transfer vegetative roof models. They include different equations to estimate rs, which show large differences, and significantly overestimate rs under certain conditions. Therefore, their models offer particular opportunities for improvement to reflect the actual vegetation cooling potential. This is necessary to predict the impact of vegetative roofs more accurately on the building energy performance and the urban heat island effect. The rs of both vegetative roof heat and mass transfer models have been developed based on studies with species that are not commonly planted on vegetative roofs. It was found that both models overestimate the rs under certain conditions that could turn into the underestimation of the transpiration rates and the cooling potential. Consequently, this paper aims to develop a novel equation for rs based on field measurements in a semiarid climate. The species tested were Glandularia berterii (C3), Selliera radicans (C3), Phyla reptans (C3), Aptenia cor-difolia (CAM), Sedum palmeri (CAM), and Sedum spurium (CAM). A New Linear Model (NLM) was formulated to estimate rs. The regressors of NLM are minimum stomatal resistance (rs,min), incident solar radiation (Rsh), leaf area index (LAI), substrate volumetric water content (VWC), and vapor pressure difference (VPD). The results show that rs,min and Rsh reflect 64 % of rs; the species with higher cooling potential were Selliera radicans, Sedum palmeri, and Sedum spurium due to higher LAI and lower/moderate rs,min; and, the NLM showed a better agree-ment with the measured rs, correcting points where Sailor (2008) and Tabares-Velasco and Srebric (2012) equations significantly overestimated rs. Finally, it was demonstrated that the developed NLM better represents the stomatal behavior and distinguishes the responses between C3 and CAM species.
An integrated thermal and lighting simulation tool to support the design process of complex fenestration systems for office buildings
(2017) Bustamante Gómez, Waldo; Uribe, Daniel; Vera Araya, Sergio Eduardo; Molina, Germán; CEDEUS (Chile)
Analysis of Net Zero Energy Buildings public policies at the residential building sector: A comparison between Chile and selected countries
(2022) Tori, F.; Bustamante Gomez, Waldo Enrique; Vera, S.; CEDEUS (Chile)
Assessment of the Effect of Phase Change Material (PCM) Glazing on the Energy Consumption and Indoor Comfort of an Office in a Semiarid Climate
(2021) Uribe, Daniel ; Vera, Sergio ; CEDEUS (Chile)
Office buildings are usually characterized by low thermal inertia, which could cause underperformance in terms of energy consumption. Moreover, the use of large, glazed facades in office buildings can cause thermal and visual discomfort due to high solar heat gains and excessive daylight transmitted into the office space. Phase Change Materials (PCMs) integrated into glazing have arisen as an innovative strategy to increase thermal inertia and improve office buildings' energy performance and indoor comfort at a low cost. This paper aims to analyze the impact of PCM glazing on buildings' energy performance and occupants' thermal and visual comfort. The analysis is performed through a one-year real-scale experiment in two offices in Santiago, Chile, with an east-oriented facade and a window-to-wall ratio (WWR) of 56%. The results are analyzed on two timescales: seasonally and daily. Representative days in each season were selected to carry out the analysis. Regarding the energy consumption of the HVAC system, PCM glazing reduces energy consumption during summer and mid-seasons and significantly reduces the peak loads in summer. A meaningful improvement in thermal comfort is achieved due to the control of the mean radiant temperature for the whole year. Considering visual comfort, there is an improvement in the luminance distribution in winter and mid-season cold conditions.
Calificación energética obligatoria para viviendas: aportes para la discusión
(Centro de Desarrollo Urbano Sustentable, 2020) Encinas Pino, Felipe Alfonso; Bustamante Gómez, Waldo Enrique; Ladron De Guevara González, Felipe Andres; CEDEUS (Chile)
El proyecto de Ley sobre Eficiencia Energética establece la obligatoriedad de la Calificación Energética de Viviendas, que hasta la fecha, había sido de aplicación voluntaria. Si bien esto puede representar un avance en la reducción de las asimetrías de información que aqueja a los consumidores, requiere de un esfuerzo significativo de comunicación e implementación y la complementariedad con otros instrumentos para que sea efectiva.
Comportamiento térmico de un material de cambio de fase en techo horizontal
(Centro de Desarrollo Urbano Sustentable, 2024) Simon, Francois Pierre; Ruiz-Valero, Letzai; CEDEUS (Chile)
El documento aborda un desafío significativo en el sector de la construcción en Chile: el consumo energético, que representó el 23% del consumo energético total del país en 2022. De esta cifra, el 53% se destinó a la calefacción y refrigeración. Esta alta demanda energética resalta la importancia de mejorar la eficiencia térmica de los edificios para reducir el consumo de energía y mitigar su impacto ambiental.
Consideraciones para programar la regeneración de condominios sociales en altura. Estudio comparado de tres casos en Chile
(Universidad de Chile, Instituto de la Vivienda, 2020) Chateau Gannon, Francisco; Schmitt Rivera, Cristián; Rasse, Alejandra; Martínez Torres, María Paula; CEDEUS (Chile)
El Programa de Regeneración de Conjuntos Habitacionales (PRCH) del MINVU ha venido a hacerse cargo de la necesidad urgente de reducir el déficit cualitativo de la vivienda social y mejorar los edificios de condominios en altura. A partir del aprendizaje de las primeras experiencias se elaboró un modelo de gestión donde se pueden constatar una serie de problemáticas derivadas de los largos plazos de ejecución de estos proyectos. El presente estudio identifica las dimensiones de la gestión, diseño e implementación de procesos que permitirían reducir sus plazos de aplicación, por medio de un análisis comparativo de tres casos de estudio en desarrollo. En la etapa de diagnóstico, se recomienda la reorganización de los estudios requeridos; y en la etapa de construcción, reconsiderar la tecnología aplicada a los sistemas constructivos, que posee un impacto relevante en los plazos de ejecución.
Decálogo para la sustentabilidad urbana: propuestas de política pública desde la investigación 2013-2023
(Centro de Desarrollo Urbano Sustentable, 2024) Bustamante Gómez, Waldo; Fuentes Arce, Luis; Gironás León, Jorge Alfredo; Pastén González, Pablo Arturo; Rojas Quezada, Carolina Alejandra; Alvarez Vandeputte, Martín; Bonilla Meléndez, Carlos Alberto; Coo, Sofía; Cortés, Sandra; Encinas Pino, Felipe; Hernández González, Manuel; CEDEUS (Chile)
Aunque los patrones de desarrollo de las ciudades son uno de los principales responsables de las emisiones de gases de efecto invernadero, el consumo de recursos y la generación de desechos, las ciudades son la mayor clave para enfrentar los desafíos de la sostenibilidad. Solo las ciudades tienen la capacidad de modificar en forma masiva las actuales tendencias, pues los cambios no dependen de la voluntad o conciencia individual, sino del impacto colectivo de la implementación de políticas públicas sostenibles en transporte, vivienda, edificaciones energética – mente eficientes, energía renovable, gestión de residuos, infraestructuras verdes y regeneración urbana.
Development and validation of a numerical heat transfer model for PCM glazing: Integration to EnergyPlus for office building energy performance applications
(Elsevier Ltd, 2024) Uribe, Daniel; Vera, Sergio; Perino, Marco; CEDEUS (Chile)
© 2024 Elsevier LtdGlazing filled with Phase Change Materials (PCMs) or PCM glazing arises as a strategy to improve the office buildings' energy performance by providing thermal inertia to glazed façades. PCM glazing can reduce office buildings' cooling energy consumption in warm climates. Literature shows a good understanding of PCM glazing thermophysical properties. However, nowadays, it is unfeasible to estimate the energy consumption of offices with PCM glazing based on annual energy simulations. Therefore, this paper aims to integrate a novel, developed, and validated PCM glazing heat transfer model for building energy performance applications into EnergyPlus. In order to do this, a numerical heat transfer model of a double-clear glazed filled with PCM based on literature is developed. This model is validated experimentally and integrated into EnergyPlus, a state-of-the-art building energy simulation tool. Annual simulations are carried out for an office room with different WWR, façade orientations, and PCMs in four climate conditions to show the model's capability to estimate the energy consumption and cooling peak load reductions. The results show that double-clear glazing filled with PCM can reduce the energy consumption of an office building up to 9.1 % and reduce the cooling peak loads up to 10.5 % compared to the same office building with a triple-clear glazing filled with argon. The best results were observed in warm climates with significant diurnal temperature variations.
Energy and copper recovery from acid mine drainage by microbial fuel cells. Effect of the hydrochar doping on carbon felt anodes
(2025) Delgado, Yelitza; Tapia, Natalia; Lopez, Ester; Llanos, Javier; Vargas, Ignacio; Fernandez-Morales, Francisco Jesus; CEDEUS (Chile)
This work investigates the performance of a Microbial Fuel Cell (MFC) for Acid Mine Drainage (AMD) treatment using bare and hydrochar-doped carbon felt (CF) anodes. Hydrochar was synthesized through hydrothermal carbonization of Spergularia rubra, followed by activation at 500 degrees C, resulting in improved O/C and H/C ratios of 0.26 and 0.78, respectively. The study reveals that doping CF anodes with non-activated and activated hydrochar significantly enhances copper recovery and electricity generation. The highest copper recovery rate of 16.0 mg/L h- 1 was achieved with activated hydrochar-doped CF (CFaH) anodes, followed by 10.6 mg/L h- 1 with nonactivated hydrochar-doped CF (CFnaH) anodes, and 7.1 mg/L h- 1 with bare CF anodes. Hydrochar doping also improved the maximum current density to 0.21 mA cm- 2 compared to 0.16 mA cm- 2 with bare CF anodes. These results demonstrate the potential of hydrochar-doped CF anodes for efficient metal and energy recovery from AMD, offering a sustainable and energy-efficient alternative to conventional methods.
Energy intensity of treating drinking water : understanding the influence of factors
(2017) Molinos Senante, María; Sala Garrido, R.; CEDEUS (Chile)
Evaluation of radiance's genBSDF capability to assess solar bidirectional properties of complex fenestration systems
(2015) Molina, G.; Bustamante Gómez, Waldo; Rao, J.; Fazio, P.; Vera Araya, Sergio Eduardo; CEDEUS (Chile)
Evaluation of view clarity through solar shading fabrics
(2022) Flamant, G.; Bustamante Gomez, Waldo Enrique; Tzempelikos, A.; Vera, S.; CEDEUS (Chile)
Experimental and Numerical Analysis of a PCM-Integrated Roof for Higher Thermal Performance of Buildings
(2024) Pierre Simon, François; Ruíz Valero, Letzai; Girard, Aymeric; Galleguillos, Héctor; CEDEUS (Chile)
Phase change materials (PCMs) designate materials able to store latent heat. PCMs change state from solid to liquid over a defined temperature range. This process is reversible and can be used for thermo-technical purposes. The present paper aims to study the thermal performance of an inorganic eutectic PCM integrated into the rooftop slab of a test room and analyze its potential for building thermal management. The experiment is conducted in two test rooms in Antofagasta (Chile) during summer, fall, and winter. The PCM is integrated into the rooftop of the first test room, while the roof panel of the second room is a sealed air cavity. The work introduces a numerical model, which is built using the finite difference method and used to simulate the rooms’ thermal behavior. Several thermal simulations of the PCM room are performed for other Chilean locations to evaluate and compare the capability of the PCM panel to store latent heat thermal energy in different climates. Results show that the indoor temperature of the PCM room in Antofagasta varies only 21.1°C±10.6°C, while the one of the air-panel room varies 28.3°C±18.5°C. Under the experiment’s conditions, the PCM room’s indoor temperature observes smoother diurnal fluctuations, with lower maximum and higher minimum indoor temperatures than that of the air-panel room. Thermal simulations in other cities show that the PCM panel has a better thermal performance during winter, as it helps to maintain or increase the room temperature by some degrees to reach comfort temperatures. This demonstrates that the implementation of such PCM in the building envelope can effectively reduce space heating and cooling needs, and improve indoor thermal comfort in different climates of Chile.
Extension of Duplexed Single-Ended Distributed Temperature Sensing Calibration Algorithms and Their Application in Geothermal Systems
(MDPI, 2022) Lillo Briceño, Matías; Suárez Poch, Francisco Ignacio; Hausner, Mark B.; Yáñez Carrizo, Gonzalo Alejandro; Veloso Espinosa, Eugenio Andrés; CEDEUS (Chile)
Fiber-optic distributed temperature sensing (DTS) has been widely used since the end of the 20th century, with various industrial, Earth sciences, and research applications. To obtain precise thermal measurements, it is important to extend the currently available DTS calibration methods, considering that environmental and deployment factors can strongly impact these measurements. In this work, a laboratory experiment was performed to assess a currently available duplexed single-ended DTS calibration algorithm and to extend it in case no temperature information is available at the end of the cables, which is extremely important in geothermal applications. The extended calibration algorithms were tested in different boreholes located in the Atacama Desert and in the Central Andes Mountains to estimate the geothermal gradient in these regions. The best algorithm found achieved a root mean square error of 0.31 +/- 0.07 degrees C at the far end of a similar to 1.1-km cable, which is much smaller than that obtained using the manufacturer algorithm (2.17 +/- 0.35 degrees C). Moreover, temperature differences between single- and double-ended measurements were less than 0.3 degrees C at the far end of the cable, which results in differences of similar to 0.5 degrees C km(-1) when determining the geothermal gradient. This improvement in the geothermal gradient is relevant, as it can reduce the drilling depth by at least 700 m in the study area. Future work should investigate new extensions of the algorithms for other DTS configurations and determining the flow rate of the Central Andes Mountains artesian well using the geothermal profile provided by the DTS measurements and the available data of the borehole
Identificación de potenciales redes de calefacción distrital en Temuco y Valdivia utilizando mapeo de energía
(Centro de Desarrollo Urbano Sustentable, 2024) Simon, François; De la Fuente Contreras, Helen; Bustamante Gómez, Waldo; CEDEUS (Chile)
Se destaca el potencial de los sistemas de calefacción distrital (CD) para reducir las emisiones de gases de efecto invernadero (GEI) del uso de energía en los hogares. Se presenta un método bottom-up para mapear el consumo residencial de energía en ciudades. Se identifican áreas con alta densidad de energía (calefacción + agua caliente sanitaria) en Temuco y Valdivia que podrían beneficiarse de sistemas de CD para reducir las emisiones de GEI de los hogares.
Impact of different control strategies of perforated curved louvers on the visual comfort and energy consumption of office buildings in different climates
(2019) Uribe, Daniel; Vera Araya, Sergio Eduardo; Bustamante Gómez, Waldo; McNeil, A.; Flamant, G.; CEDEUS (Chile)
Integration of energy and seismic-structural design variables through the optimization of a multi-story residential light-frame timber building with different seismic lateral connectors and building stories
(2022) Wenzel, A.; Vera, S.; Guindos Bretones, Pablo; CEDEUS (Chile)

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