Artículos (Instituto Universitario de Arquitectura y Ciencias de la Construcción (IUACC))

URI permanente para esta colecciónhttps://hdl.handle.net/11441/11437

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CO2 concentration and occupants’ symptoms in naturally ventilated schools in Mediterranean climate
(MDPI, 2019) Fernández-Agüera, Jessica; Campano, Miguel Ángel; Domínguez Amarillo, Samuel; Acosta García, Ignacio Javier; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
A large part of the school building stock in Andalusia lacks ventilation facilities, so that the air renewal of the classrooms is achieved through the building envelope (air infiltration) or the opening of windows. This research analyses the airtightness of the classrooms in Andalusia and the evolution of CO2 concentration during school hours through in situ monitoring. Pressurization and depressurization tests were performed in 42 classrooms and CO2 concentration was measured in two different periods, winter and midseason, to study the impact of the different levels of aperture of windows. About 917 students (11–17 years of age) were surveyed on symptoms and effects on their health. The mean n50 values are about 7 h-1, whereas the average CO2 concentration values are about 1878 ppm, with 42% of the case studies displaying concentrations above 2000 ppm with windows closed.
TVOCs and PM 2.5 in Naturally Ventilated Homes: Three Case Studies in a Mild Climate
(MDPI, 2019) Fernández-Agüera, Jessica; Domínguez Amarillo, Samuel; Fornaciari, Marco; Orlandi, Fabio; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
In southern Europe, the present stock of social housing is ventilated naturally, with practice varying in the di erent seasons of the year. In winter, windows are kept closed most of the day with the exception of short periods for ventilation, whereas the rest of the year the windows are almost permanently open. In cold weather, air changes depend primarily on the air infiltrating across the envelope and when the temperature is warm, on the air flowing in through open windows. CO2, PM2.5, and TVOC concentration patterns were gathered over a year’s time in three social housing developments in southern Europe with di erent airtightness conditions and analyzed to determine possible relationships between environmental parameters and occupants’ use profiles. Correlations were found between TVOC and CO2 concentrations, for human activity was identified as the primary source of indoor contaminants: peak TVOC concentrations were related to specific household activities such as cooking or leisure. Indoor and outdoor PM2.5 concentrations were likewise observed to be correlated, although not linearly due to the presence of indoor sources. Ventilation as presently practiced in winter appears to be insufficient to dilute indoor contaminants in all three buildings, nor does summertime behavior guarantee air quality.
Evaluating non-intrusive energy retrofits for the built heritage of the historic centre of Oporto
(Wit Press, 2017) Alves, Sílvia Maria do Carmo; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Traditional building materials and techniques should be preserved when selecting retrofit strategies. The most recurrent energy retrofit strategies proposed for the historic centre of Oporto are mainly focused on achieving, or even overlapping, the reference U-values established for the external envelope on national energy regulations, although historic sites are not obliged to comply with it. On the other hand, national cultural heritage preservation policies, by allowing alterations on these historic buildings interior, validate the adding of thermal insulation materials on internal walls. Nevertheless, these inteventions may put to risk architectural patrimonial values, hence, sustainable ones. A more opportune intervention could be the enhancement of the windows performance, due to its most common bad state of conservation. This article analyses the performance of two non-intrusive retrofit strategies, in a representative model of these buildings: the enhancement of ventilation and the substitution of the single glazed windows for double glazed ones, and the two combined. On a first approach, using as a reference the heating loads limits established in the energy regulation of 2013 and the normative methodology, it is calculated the corresponding number of hours of daily heating use, in order to stand below these limits. The results obtained showed that this is attainable, in comfortable conditions of heating use. In order to achieve more accurate results and conclusions a dynamic simulation was performed using energy models, for the heating and cooling season. The enhancement of ventilation proved to be the most effective retrofit strategy.
Protocol for the energy behaviour assessment of social housing stock: the case of southern Europe.
(Elsevier, 2016) Escandón Ramírez, Rocío; Suárez, Rafael; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
The aim of recent European Directives and Regulations is the establishment of a common framework for increasing energy efficiency, encouraging the retrofitting of existing housing stock, obsolete in energy terms. Most of the studies carried out on the energy characterisation of existing housing stock for their subsequent retrofitting focus on climate areas in central and northern Europe, but there are fewer studies for southern Europe. This research was initiated in order to contribute to a better understanding of social housing in southern Europe, specifically southern Spain. A protocol was proposed for the assessment of the end-use energy behaviour of social housing stock, taking into consideration geographical location, building typologies, and morphological and constructive characteristics of the envelopes of this housing stock. This protocol is divided into two different phases: a first phase for a general energy assessment and a second phase for a detailed energy assessment. It aims to provide a general energy behaviour assessment as the first step in the proposal of guidelines and strategies for the energy retrofitting of existing social housing stock. In order to achieve these objectives, the first phase of the proposed protocol includes a typological classification of buildings and a morphological and constructive characterisation of thermal envelopes by construction period. The second phase of the protocol includes onsite data collection on hygrothermal behaviour and energy consumption and generation and validation of energy models in the buildings selected for their subsequent energy simulation and rating. In this study, the first phase of the protocol was applied to five case studies built between 1950 and 1980 in the different climate zones in the south of Spain, with the main conclusion that the existing general high level of demand due to the poor thermal performance of the envelope leads to a very low energy rating.
Towards an Energy Assessment on an Urban Scale for Retrofitting the Housing Stock in Mediterranean Cities
(Elsevier, 2017) Martínez Hervás, Mónica; Sendra, Juan J.; Suárez, Rafael; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
According to European Directive 2012/27/EU energy retrofitting of the current housing stock is being promoted. However, few studies have been carried out characterizing housing stock energy performance in order to incorporate energy retrofitting in cities in the southern Mediterranean area. The aim of this paper is to propose an energy assessment methodology on urban scale and to apply it to the southern Spanish province of Cadiz. This is followed by the generation of a predictive model for energy assessment in Mediterranean cities which could be further developed and used in the future to estimate overall energy efficiency on an urban scale.
Test cell data-based predictive modelling to determine HVAC energy consumption for three façade solutions in Madrid
(Consejo Superior de Investigaciones Científicas, 2017) Guerrero Rubio, Julia; Sendra, Juan J.; Fernández-Agüera, Jessica; Oteiza San José, Ignacio de; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
This study aims to narrow the gap between predicted and actual energy performance in buildings. Predictive models were established that relate the electric consumption by HVAC systems to maintain certain indoor environmental conditions in variable weather to the type of façade. The models were developed using data gathered from test cells with adiabatic envelopes on all but the façade to be tested. Three façade types were studied. The first, the standard solution, consisted in a double wythe brick wall with an intermediate air space, the configuration most commonly deployed in multi-family dwellings built in Spain between 1940 and 1980 (prior to the enactment of the first building codes that limited overall energy demand in buildings). The other two were retrofits frequently found in such buildings: ventilated façades and ETICS (external thermal insulation composite systems). Two predictive models were designed for each type of façade, one for summer and the other for winter. The linear regression equations and the main statistical parameters are reported.
Adaptive approach-based assessment of a heritage residential complex in southern Spain for improving comfort and energy efficiency through passive strategies: A study based on a monitored flat
(Elsevier, 2019-08) Blázquez de Pineda, María Teresa; Ferrari, Simone; Suárez, Rafael; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
The energy retrofitting of residential stock is not always straightforward where heritage protected housing is concerned. In southern Europe, many examples built under the Modern Movement codes are now obsolete in terms of energy efficiency. The aim of this paper is to assess the potential for improvement of comfort conditions and energy efficiency in Mediterranean heritage residential buildings, through the incorporation of passive strategies in keeping with preserving heritage values. Long-term monitoring and field tests in representative flats of the case-study building were carried out and, focusing on a single example, adaptive comfort equations were used to assess results. The passive strategies considered are the thermal isolation of the air cavities of walls, changing window frames, optimizing window glazing, and setting up regular mechanical ventilation rates for indoor air changes. Although simulation results generally predict a better energy performance after testing retrofit strategies, the potential decrease in energy demand is more noticeable than the potential improvement in comfort conditions.
Passive cooling through phase change materials in buildings. A critical study of implementation alternatives
(Elsevier, 2019-11) Lizana Moral, Francisco Jesús; Borja Torrejón, Manuel de; Barrios Padura, Ángela; Auer, Thomas; Chacartegui, Ricardo; Universidad de Sevilla. Departamento de Ingeniería Energética; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Global warming is gradually increasing the cooling energy demand of buildings. Phase change materials (PCM) offer high potential to passively reduce cooling energy consumption and overheating by absorbing heat gains in the daytime through their melting process, and releasing the heat at night while solidifying by taking advantage of free cooling through natural ventilation. However, the effectiveness of PCM-based solutions highly depends on the implementation techniques, material properties, environmental conditions and occupants’ behaviour. This paper analyses the performance of PCM-based solutions towards passive and low-energy cooling through a parametric study carried out in TRNSYS, in order to identify main design criteria for their optimal implementation. Two PCM implementation alternatives are assessed: a conventional passive application based on a PCM layer attached at the ceiling in contact with the indoor space, in which the heat transfer between PCM and air is based on natural convection; and an optimised low-energy application designed as a PCM layer integrated inside the suspended ceiling, in which the air flow is forced by a fan to enhance the heat transfer between PCM and the air. Both solutions are studied with and without the simultaneous operation of air-conditioning systems. A dwelling in a multi-family building was selected as a reference scenario. The results show that in the scenario with no participation of air-conditioning systems, the optimised PCM-based solution could reduce discomfort hours by 65% regarding the adaptive comfort model, and up to 83% through additional improvements in order to increase the heat transfer between PCM and air. On the other hand, the simulations reflect that both PCM-based solutions do not provide benefits in scenarios with an intermittent operation of air-conditioning systems. This study concludes with design criteria and strategies for an optimal implementation of PCM towards low-carbon buildings.
Rethinking User Behaviour Comfort Patterns in the South of Spain—What Users Really Do
(MDPI, 2018-11) Domínguez Amarillo, Samuel; Fernández-Agüera, Jessica; Sendra, Juan J.; Roaf, Susan; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Although energy analysis techniques can contribute to substantial energy savings in housing stock retrofitting operations, the outcomes often deviate significantly from the predicted results, which tend to overestimate potential savings by overestimating the starting energy baselines, particularly in southern Europe. This deviation can be largely attributed to occupant practice relating to the use of air conditioning facilities and the temperatures at which occupants feel comfortable. The patterns observed differed widely from standard values. In this study environmental variables, primarily indoor air temperature both with and without HVAC, were monitored in occupied dwellings for a full year. The data gathered were supplemented with surveys on occupants’ temperature-related behaviour to define comfort patterns. The findings show that the standards in place are not consistent with actual comfort-accepted patterns in medium- to low-income housing in southern Spain, where energy consumption was observed to be lower than expected, mostly because occupants endure unsuitable, even unhealthy, conditions over long periods of time. A new user profile, better adjusted to practice in southern Europe, particularly in social housing, is proposed to reflect the current situation.
Thermal 3D CFD Simulation with Active Transparent Façade in Buildings
(MDPI, 2018-08-28) Ramírez Balas, Cristina; Fernández Nieto, Enrique Domingo; Narbona Reina, Gladys; Sendra, Juan J.; Suárez, Rafael; Universidad de Sevilla. Departamento de Matemática Aplicada I; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA); Universidad de Sevilla. FQM120: Modelado Matemático y Simulación de Sistemas Medioambientales
In recent years active façades have acquired greater importance given their capacity to improve the energy efficiency of buildings. One such type is the so-called Active Transparent Façade (ATF). A 3D numerical model based on computational fluid dynamics (CFD) and the Finite Element Method (FEM) has been generated to simulate the thermal performance of buildings equipped with this type of façade. This model is introduced for general application and allows the design parameters to be adapted for this system. The case study of Le Corbusier’s proposal for the City of Refuge in Paris, the clearest example of previous use of an ATF is examined. In addition, a proposal is presented for the energy improvement of Le Corbusier’s original solution. In order to do so, the conditions for the supply of air into the ATF cavity and in the mechanical ventilation system are assessed to guarantee comfort conditions.
The acoustics of the choir in Spanish cathedrals
(MDPI, 2018-12) Alonso Carrillo, Alicia; Suárez, Rafael; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
One of the most significant enclosures in worship spaces is that of the choir. Generally, from a historical point of view, the choir is a semi-enclosed and privileged area reserved for the clergy, whose position and configuration gives it a private character. Regarding the generation and transformation of ecclesial interior spaces, the choir commands a role of the first magnitude. Its shape and location produce, on occasions, major modifications that significantly affect the acoustics of these indoor spaces. In the case of Spanish cathedrals, whose design responds to the so-called “Spanish type”, the central position of the choir, enclosed by high stonework walls on three of its sides and with numerous wooden stalls inside, breaks up the space in the main nave, thereby generating other new spaces, such as the trascoro. The aim of this work was to analyse the acoustic evolution of the choir as one of the main elements that configure the sound space of Spanish cathedrals. By means of in situ measurements and simulation models, the main acoustic parameters were evaluated, both in their current state and in their original configurations that have since disappeared. This analysis enabled the various acoustic conditions existing between the choir itself and the area of the faithful to be verified, and the significant improvement of the acoustic quality in the choir space to become apparent. The effect on the acoustic parameters is highly significant, with slight differences in the choir, where the values are appropriate for Gregorian chants, and suitable intelligibility of sung text. High values are also obtained in the area of the faithful, which lacked specific acoustic requirements at the time of construction.
Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management
(MDPI, 2018-11) Acosta García, Ignacio Javier; Campano, Miguel Ángel; Domínguez Amarillo, Samuel; Muñoz González, Carmen María; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
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.
Thermal perception in mild climate: adaptive thermal models for schools
(MDPI, 2019-07) Campano, Miguel Ángel; Domínguez Amarillo, Samuel; Fernández-Agüera, Jessica; Sendra, Juan J.; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
A comprehensive assessment of indoor environmental conditions is performed on a representative sample of classrooms in schools across southern Spain (Mediterranean climate) to evaluate the thermal comfort level, thermal perception and preference, and the relationship with HVAC systems, with a comparison of seasons and personal clothing. Almost fifty classrooms were studied and around one thousand pool-surveys distributed among their occupants, aged 12 to 17. These measurements were performed during spring, autumn, and winter, considered the most representative periods of use for schools. A new proposed protocol has been developed for the collection and subsequent analysis of data, applying thermal comfort indicators and using the most frequent predictive models, rational (RTC) and adaptive (ATC), for comparison. Cooling is not provided in any of the rooms and natural ventilation is found in most of the spaces during midseasons. Despite the existence of a general heating service in almost all classrooms in the cold period, the use of mechanical ventilation is limited. Heating did not usually provide standard set-point temperatures. However, this did not lead to widespread complaints, as occupants perceive the thermal environment as neutral—varying greatly between users—and show a preference for slightly colder environments. Comparison of these thermal comfort votes and the thermal comfort indicators used showed a better fit of thermal preference over thermal sensation and more reliable results when using regional ATC indicators than the ASHRAE adaptive model. This highlights the significance of inhabitants’ actual thermal perception. These findings provide useful insight for a more accurate design of this type of building, as well as a suitable tool for the improvement of existing spaces, improving the conditions for both comfort and wellbeing in these spaces, as well as providing a better fit of energy use for actual comfort conditions.
Predicting the Impact of Climate Change on Thermal Comfort in A Building Category: The Case of Linear-type Social Housing Stock in Southern Spain
(MDPI, 2019-06) Escandón Ramírez, Rocío; Suárez, Rafael; Sendra, Juan J.; Ascione, Fabrizio; Bianco, Nicola; Mauro, Gerardo Maria; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
The Climate Change scenario projected by the IPCC for the year 2050 predicts noticeable increases in temperature. In severe summer climates, such as the Mediterranean area, this would have very negative e ects on thermal comfort in the existing housing stock, given the current high percentage of dwellings which are obsolete in energy terms and house a population at serious risk of energy poverty. The main aim of this paper is to generate a predictive model in order to assess the impact of this future climate scenario on thermal comfort conditions in an entire building category. To do so, calibrated models representing linear-type social multi-family buildings, dating from the post-war period and located in southern Spain, will be simulated extensively using transient energy analyses performed by EnergyPlus. In addition, a sensitivity analysis will be performed to identify the most influential parameters on thermal discomfort. The main results predict a generalized deterioration in indoor thermal comfort conditions due to global warming, increasing the average percentage of discomfort hours during the summer by more than 35%. This characterization of the future thermal behaviour of the residential stock in southern Spain could be a trustworthy tool for decision-making in energy retrofitting projects which are so badly needed. To do so, further work is required on some limitations of this model so that di erent user profiles and typologies can be represented in detail and an economic assessment can be included.
Assessment of Indoor Environmental Quality for Retrofitting Classrooms with An Egg-Crate Shading Device in A Hot Climate
(2019-02) Calama-González, Carmen María; Suárez, Rafael; León-Rodríguez, Ángel Luis; Ferrari, Simone; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
In the Mediterranean climate, a large number of educational buildings suffer from discomfort due mostly to energy-deficient thermal envelopes and a lack of cooling systems. Impending climate change is expected to worsen overheating in classrooms, especially during heatwave periods. Therefore, the protection of window openings to reduce incident solar radiation while maintaining adequate indoor environmental quality must be considered a necessary key focus. The main objective of this research is to assess the influence of an egg-crate shading device on the indoor environmental quality of a classroom in Southern Spain. To do so, two classrooms—with and without this shading device—were simultaneously monitored over a whole year. The implementation of an egg-crate shading device allowed for a significant reduction of the incident solar radiation, both in summer and mid-season (around 45–50%), which objectively slightly conditioned indoor operative temperatures. Given the noticeable influence of the user patterns observed, indoor illuminance was also improved, as the rolling shutters tended to be opened at higher aperture levels.
Characterising draught in Mediterranean multifamily housing
(MDPI, 2019-04) Fernández-Agüera, Jessica; Domínguez Amarillo, Samuel; Campano, Miguel Ángel; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Social housing dating from the postwar years through the end of the twentieth century is one of the major stores of European cities’ residential stock. As it is generally characterised by a poor thermal performance and an ine cient control of energy consumption, it constitutes one of the main targets for residential heritage renewal. This study aimed to locate and quantify air leaks across building envelopes in Mediterranean multifamily housing with a view to curbing the uncontrolled inflow of outdoor air that has a direct impact on occupant comfort and housing energy demand. Airtightness tests conducted in a series of protocols to quantify draught across envelope elements were supplemented with qualitative infrared thermographic and smoke tests to locate leakage pathways. Air was found to flow mainly across façade enclosures, primarily around openings, as well as through service penetrations in walls between flats and communal areas accommodating electrical and telecommunication wires and water supply, domestic hot water (DHW), and drainage pipes. The general absence of evidence of draught across structural floors or inter-flat partitions was consistent with the construction systems in place.
Daylighting Performance of Solar Control Films for Hospital Buildings in a Mediterranean Climate
(MDPI, 2019-02) Calama-González, Carmen María; León-Rodríguez, Ángel Luis; Suárez, Rafael; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
One of the main retrofitting strategies in warm climates is the reduction of the effects of solar radiation. Cooling loads, and in turn, cooling consumption, can be reduced through the implementation of reflective materials such as solar control films. However, these devices may also negatively affect daylight illuminance conditions and the electric consumption of artificial lighting systems. In a hospital building, it is crucial to meet daylighting requirements as well as indoor illuminance levels and visibility from the inside, as these have a significant impact on health outcomes. The aim of this paper is to evaluate the influence on natural illuminance conditions of a solar control film installed on the windows of a public hospital building in a Mediterranean climate. To this end, a hospital room, with and without solar film, was monitored for a whole year. A descriptive statistical analysis was conducted on the use of artificial lighting, illuminance levels and rolling shutter aperture levels, as well as an analysis of natural illuminance and electric consumption of the artificial lighting system. The addition of a solar control film to the external surface of the window, in combination with the user-controlled rolling shutter aperture levels, has reduced the electric consumption of the artificial lighting system by 12.2%. Likewise, the solar control film has increased the percentage of annual hours with natural illuminance levels by 100–300 lux.
Effect of airtightness on thermal loads in legacy low-income housing
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-05-02) Domínguez Amarillo, Samuel; Fernández-Agüera, Jessica; Campano, Miguel Ángel; Acosta García, Ignacio Javier; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Spain's high winter weather-associated death count, the second largest in Europe, can be attributed primarily to the low construction standards of its social housing, particularly the stock built prior to the entry into effect of the earliest statutory provisions on envelope quality. Hence, improving building envelopes to both reduce energy consumption and raise occupant comfort levels is important. Air leakage is one of the factors with the greatest impact on indoor comfort and domestic energy consumption. This study explores the sensitivity of energy consumption to that parameter in a series of types of social housing built between 1950 and 1979 in five Mediterranean climate zones. Demand in a total of 53 housing units located in 21 developments was simulated to that end. The findings show that air permeability has a significant effect on wintertime demand in the sample studied. Although the impact is greater in the more severe climates where it is estimated to be over 10 kWh/m2, it may also affect energy consumption in mild climates.
Solar Decathlon Latin America and Caribbean: Comfort and the Balance between Passive and Active Design
(MDPI, 2019) Herrera-Limones, Rafael; León-Rodríguez, Ángel Luis; López Escamilla, Álvaro; Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
This article contains an overall analysis of the results obtained by the four highest scoring teams in the Solar Decathlon Latin America and Caribbean 2015 collegiate sustainable habitat competition. Considering that the prototypes developed were based on energy self-su ciency when operational, it was considered necessary to propose this analysis based on the degree of suitability of each of these models based on their di erent performances from the perspective of comfort conditions. It was observed that the design of the prototypes did not manage to properly adjust the relationship between passive and active conditioning elements based on the location’s conditions. Accordingly, this article concludes that a balance of the two aforementioned conditioning modes recorded better results based on the measurements taken.
Daylight Spectrum Index: A New Metric to Assess the Affinity of Light Sources with Daylighting
(Multidisciplinary Digital Publishing Institute, 2018-09-24) Acosta García, Ignacio Javier; Bustamante, Pedro; León Rodríguez, Jesús; Universidad de Sevilla. Construcciones Arquitectónicas I (ETSA); Gobierno de España
The current scenario of colorimetry shows a wide variety of different metrics which do not converge in the assessment of the color rendering of light sources. The limitations of the Color Rendering Index have promoted the emergence of new metrics, such as the Color Quality Scale. As in the case of the previous metric, these new concepts are based on the analysis of the deviation of different color samples in a color space, contrasting the results with those obtained with a light source reference, which can vary depending on the color temperature. Within this context, the Daylight Spectrum Index is proposed. This new concept aims to determine the affinity with daylighting of electric light sources, comparing the resulting spectral power distributions of the lamps studied and that observed under natural light. The affinity of an electric light source with daylighting allows for lower energy consumption due to the better performance of human vision. The new metric proposed is evaluated following the results obtained from 80 surveys, demonstrating the usefulness of this new concept in the quantification of color rendering of LED lamps and the affinity of electric light sources with daylighting.

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