Design and Performance of Test Cells as an Energy Evaluation Model of Facades in a Mediterranean Building Area

León-Rodríguez, Ángel Luis; Suárez, Rafael; Bustamante, Pedro; Campano, Miguel Ángel; Moreno-Rangel, David

doi:10.3390/en10111816

Cited by 33 publications

(23 citation statements)

References 17 publications

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“…The room selected for this validation process is one of the test cells of TEP-130 research group [53], located in Seville (Spain) and facing south, in order to optimize rehabilitation solutions on façades and windows in the Mediterranean area.…”

Section: Characteristics Of the Test Cell For Validation Processmentioning

confidence: 99%

Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management

et al. 2018

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Daylight performance metrics provide a promising approach for the design and optimization of lighting strategies in buildings and their management. Smart controls for electric lighting can reduce power consumption and promote visual comfort using different control strategies, based on affordable technologies and low building impact. The aim of this research is to assess the energy efficiency of these smart controls by means of dynamic daylight performance metrics, to determine suitable solutions based on the geometry of the architecture and the weather conditions. The analysis considers different room dimensions, with variable window size and two mean surface reflectance values. DaySim 3.1 lighting software provides the simulations for the study, determining the necessary quantification of dynamic metrics to evaluate the usefulness of the proposed smart controls and their impact on energy efficiency. The validation of dynamic metrics is carried out by monitoring a mesh of illuminance-meters in test cells throughout one year. The results showed that, for most rooms more than 3.00 m deep, smart controls achieve worthwhile energy savings and a low payback period, regardless of weather conditions and for worst-case situations. It is also concluded that dimming systems provide a higher net present value and allow the use of smaller window size than other control solutions.Smart control strategies require the assessment of different variables: the window size is essential to determine electricity consumption [9], as are the reflectance of the room surfaces and the location of the building [10]. The illuminance controls also have a significant impact on the thermal comfort of occupants, mainly due to solar heat gain, so that algorithms should take all possible variables into account [11]. One of the most common smart controls is that of dimming systems [12,13], which adjust the electricity power of the luminaires. The dimmer can be controlled by illuminance-meters which significantly reduce the power consumption in electric lighting [14,15].According to the latest studies [16][17][18], the strategies for lighting control can reduce power consumption by up to 50% when using dimming systems and close to 30% using occupant detectors. However, these technologies are not widespread, given the difficulties in installation, the limitations of the prediction algorithms, and the individual management preferences of occupants [19][20][21]. It is therefore important to emphasize the benefits from all these strategies, quantifying their energy efficiency and economic profitability, and avoiding an overestimation of the savings or overly optimistic analysis. Hence, the use of dynamic daylight metrics will provide a better whole-year fit. Unlike daylight static concepts, dynamic metrics allow the accurate quantification of energy savings in electric lighting, including variables not considered by static metrics, such as weather conditions, occupancy hours or illuminance thresholds required by the task being carried out [22-24]. Aim a...

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Section: Characteristics Of the Test Cell For Validation Processmentioning

confidence: 99%

Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management

et al. 2018

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“…Outdoor variables were measured using a local weather station 450 m away located above test cells managed by the research group. As described in a previous paper by the authors [17], this system measures outdoor ambient variables for air temperature, relative humidity, CO 2 levels, and wind speed and direction. Table 2 includes technical information on the sensors from the local weather station.…”

Section: Monitoring Systemmentioning

confidence: 99%

Thermal and Lighting Consumption Savings in Classrooms Retrofitted with Shading Devices in a Hot Climate

2018

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Most educational buildings in southern Spain do not meet current energy requirements as weak thermal envelopes and the lack of cooling systems lead to severe discomfort in classrooms, especially when temperatures are above 30 • C. Given that global warming is expected to worsen this situation in coming decades, one of the first steps to be taken is to protect window openings from high levels of solar radiation by adding shading devices to reduce indoor temperatures and improve visual comfort. The aim of this research is to evaluate the reduction in thermal and lighting consumption in a classroom where a solar protection system in the form of an egg-crate shading device was installed. Two classrooms-one with an egg-crate device and another with no shading system-were monitored and compared for a whole year. The use of an egg-crate device in these classrooms reduced indoor operative temperatures during warmer periods while also improving indoor natural illuminance levels. Moreover, annual electric air conditioning consumption decreased by approximately 20%, with a 50% reduction in electric lighting consumption. These savings in electricity were largely conditioned by the use patterns observed in these ambient systems.Energies 2018, 11, 2790 2 of 17 were therefore considered potential components for the reduction of energy consumption, but this is also conditioned by user patterns, as concluded in the laboratory experiments by Zeiler et al. [7].While solar radiation through glazed surfaces severely affects indoor temperatures and visual comfort, heat gains through window openings improve natural illuminance levels and increase indoor temperatures in winter, causing visual discomfort and overheating in summer. Although solar energy facilitates the passive heating of buildings, excessive solar gains can lead to overheating and glare, so that solar control systems must therefore cover aspects such as thermal and visual comfort and energy saving. Although it should be possible to look out and maintain visual contact with the exterior while respecting the architectural aesthetics of the building, the main function of shading devices is to reduce solar gains in the summer season.Various authors have attempted to establish a classification [8] and comparative evaluation of different solar-control systems [9] using integrated solutions for energy, acoustic, and lighting performances [10]. Much of this analysis focuses on the impact on energy requirements [11] and energy demand [12] in office buildings. Dynamic control strategies are needed to promote optimum performance of these shading devices given the opposing requirements in winter and summer.Eltaweel and Su [13] proposed modifying the position and angle of Venetian blinds, using Grasshopper's plugins to optimize daylight in office buildings, whereas other authors preferred simplified solutions which are easier to apply in building refurbishment. Freewan [14] compared the effect of different external vertical and diagonal fins and egg-crate devices behind a brise-soleil...

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“…En España en las distintas zonas climáticas existen también varias instalaciones. Cabe destacar, en Madrid, en clima continental el Laboratorio GESLAB de la UPM, que cuenta con 11 celdas de ensayo para el estudio de componentes de fachada y cubierta (17); en Sevilla en clima mediterráneo la Universidad de Sevilla analiza en dos pares de celdas componentes de fachada para rehabilitación (18), en la Plataforma Solar de Almería (PSA) en clima desértico se prueban distintos componentes de fachada en diversas instalaciones (19) y en Álava, en clima de baja radiación solar, en dos celdas PASLINK se analizan componentes tanto de fachada y como de cubierta (20).…”

Section: Metodologíaunclassified

Construcción y monitorización del Laboratorio REVen para el estudio del impacto de las ventanas integrando eficiencia energética y calidad ambiental interior

et al. 2020

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El proyecto REVen “Rehabilitación energética de viviendas sociales, aplicando productos innovadores de ventana con marcado CE” (BIA2014-56650-JIN), tiene como objetivo realizar un análisis integral del impacto de la ventana en los aspectos relativos a eficiencia energética y calidad ambiental. Para caracterizar los flujos de energía y las condiciones ambientales internas se ha construido el Laboratorio REVen. Este artículo describe la construcción y la monitorización de este laboratorio analizando los datos de su primer año de funcionamiento. Los resultados permiten afirmar que se logra una mejora significativa del confort térmico obteniendo un ahorro de energía anual del 25 %.

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Design and Performance of Test Cells as an Energy Evaluation Model of Facades in a Mediterranean Building Area

Cited by 33 publications

References 17 publications

Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management

Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management

Thermal and Lighting Consumption Savings in Classrooms Retrofitted with Shading Devices in a Hot Climate

Construcción y monitorización del Laboratorio REVen para el estudio del impacto de las ventanas integrando eficiencia energética y calidad ambiental interior

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