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2 results on '"Helena Coch"'

1. Assessment of the reflectivity and emissivity impact on light metal roofs thermal behaviour, in warm and humid climate

Author

Jefferson Torres-Quezada, Helena Coch, Antonio Isalgue, Universitat Politècnica de Catalunya. Departament de Tecnologia de l'Arquitectura, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. AIEM - Arquitectura, energia i medi ambient

Subjects
Edificació::Elements constructius d'edificis::Elements de tancament [Àrees temàtiques de la UPC], Edificació::Materials de construcció::Materials metàl·lics de construcció [Àrees temàtiques de la UPC], 020209 energy, 0211 other engineering and technologies, Warm and humid climates, 02 engineering and technology, engineering.material, Atmospheric sciences, Energies::Energia solar tèrmica::Radiació solar [Àrees temàtiques de la UPC], 021105 building & construction, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Emissivity, Radiative transfer, Electrical and Electronic Engineering, Roof, Overheating (electricity), Metal roofing, Civil and Structural Engineering, Cobertes metàl·liques, Solar reflectivity, Mechanical Engineering, Thermal emissivity, Building and Construction, Metal roof, Light metal, Heat flux, engineering, Environmental science
Abstract

The light metal roof is one of the roof typologies most used in low latitude regions with warm and humid climates. The low installation cost is one of the benefits of this typology, however, they offer only low resistance to the heat flux. In order to analyse strategies to reduce the indoor overheating in this climates, this investigation addresses the impact of reflectivity and emissivity on the light metal roof thermal behaviour. The study was carried out with dynamic simulations, considering the climate of a city in the south coast of Ecuador (Santa Rosa, 3°27′S). This analysis has parameterized the interior surface temperature in function of the reflectivity and emissivity, which has been validated with the measurements of several samples with different radiative properties. The analysed samples show that the effect of the aging and the use of different paints have a higher impact on the increase in emissivity than on reflectivity. In conclusion, the results show that the radiative parameter with the highest influence on interior surface temperature reduction is emissivity.

Published
2019

2. Yellow is green: An opportunity for energy savings through colour in architectural spaces

Author

Judit Lopez-Besora, Carlos Alonso, Helena Coch, Isabel Crespo, and Antonio Isalgue

Subjects
Architectural engineering, Visual perception, Artificial light, Computer science, business.industry, Mechanical Engineering, media_common.quotation_subject, Illuminance, Building and Construction, Space (mathematics), Luminance, Quality (business), Computer vision, Artificial intelligence, Electrical and Electronic Engineering, Architecture, business, Energy (signal processing), Civil and Structural Engineering, media_common
Abstract

Today, the building sector is one of the greatest energy consumers of the world. Therefore, it is important that designers think about strategies to save energy at the different stages of the building process, including during its life. Considering that a great deal of energy will be spent in artificial lighting, an improvement in the performance in front of light of the architecture itself could lead to a better vision of the spaces, which depends on the quantity and quality of light available and on the architectural characteristics as well. One of the most influential aspects is the colour of the space. Here, a case study is presented in which three coloured spaces were assessed by observers under different lighting conditions. Luminance and illuminance measurements were taken to compare these values with the votes given. The results query the correlation between measured values and luminosity of three-dimensional spaces. As a consequence, the choice of a particular colour may increase the sensation of light in a space and, therefore, a reduction of energy use in artificial lighting is possible. In addition, architectural design can take advantage of colour to improve the visual quality of indoor spaces.

Published
2014

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