Articles publicats (Enginyeria Industrial i de l’Edificació)

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    Open Access
    Process Technology and Sustainability Assessment of Wastewater Treatment
    (American Chemical Society, 2023) Tran, Nam Nghiep; Escribà i Gelonch, Marc; Sarafraz, M. M.; Pho, Quoc Hue; Sagadevan, Suresh; Hessel, Volker
    Removal of heavy metals in wastewater treatment is crucial to protect the environment, wildlife, and human health. Various techniques have been developed focusing on removal of heavy metal ions, pharmaceuticals, and other contaminants from different wastewater sources. The main methods include adsorption, filtration, ion exchange, electrochemical, reverse osmosis, precipitation, flotation/coagulation/flocculation, and photocatalytic-based treatments. This paper comprehensively assesses the sustainability of those common technologies used for wastewater process treatment. The sustainability profile depends mostly on the exact approach followed for each technology, including its energy consumption, type of radiation (where appropriate), auxiliary materials used (e.g., catalysts, adsorbents), and further specific experimental process settings. Thus, while sustainability inevitably provides a multifaceted answer, the review finally aims for sustainability benchmarking of all technologies, by compressing the manifold outcomes toward a compact information set, such as a table and radar plot.
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    Open Access
    How internal heat loads of buildings affect the effectiveness of vertical greenery systems? An experimental study
    (Elsevier, 2020) Coma Arpón, Julià; Chàfer, Marta; Pérez Luque, Gabriel; Cabeza, Luisa F.
    Nature-based solutions applied to the building skin, such as green roofs and vertical greenery systems, are standing out as the most promising by contributing with thermal improvements at building scale. From previous research done by GREiA research group at the University of Lleida (Spain), energy savings up to 58% were obtained by implementing vertical greenery systems on external building walls for cooling purposes. However, since there exist other passive and active energy saving technologies in the literature review that were limited their cooling and heating capacity after implementing internal heat loads, new experimental tests for two different vertical greenery systems simulating the heat loads in both, summer and winter were conducted in this research. Additionally, these experiments also improve the scarce and controversial literature for winter conditions. The results demonstrated that considering internal loads in experimental investigations is crucial for the results of the effectiveness of the green walls and green facades. The energy savings of VGS were reduced between 22.5% and 26.7% because of the internal loads for cooling purposes, and increased about 3.6% and 3.1% for heating.
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    Open Access
    Evaluation of the development of five Sedum species on extensive green roofs in a continental Mediterranean climate
    (Elsevier, 2020) Pérez Luque, Gabriel; Chocarro, Cristina; Juárez Escario, Alejandro; Coma Arpón, Julià
    Because of their easy implementation and low maintenance, extensive green roofs have become established during the last few decades as one of the best options for integrating vegetation on the built environment. The success of these systems involves having of a plant species palette well adapted to extreme conditions, especially in drought environments. Among the available ones, the Sedum genus has stood out due to its tolerance to climate extreme conditions and its use has been widespread throughout the world. In previous research, efforts have been mainly concentrated on selecting the most drought tolerant Sedum species, without considering other important parameters for the suitable provision of ecosystem services from the green roof, such as coverage capacity, shape and structure or growth strategy, among others. In this study, five species of Sedum (Sedum album, S. sediforme, S. sexangulare, Sedum spurium cf. öCoccineum’ (syn. Phedimus spurius cf. öCoccineum’) and Sedum spurium cf. öSummer Glory’ (syn. Phedimus spurius cf. öSummer Glory’) were tested in a dry continental Mediterranean climate with the aim of observing their patterns of growth and development. Results revealed that Sedum album, S. sediforme, S. sexangulare are recommended species for their use on extensive green roofs in this climate, whereas both varieties of S. spurium, particularly var. “Coccineum”, present some limitations for their use, basically due to their shape, plant structure, pigmentation and lack of adaptation to winter conditions. Shape Index could be an adequate tool for decision-making in the selection of plant species in the design of green roofs because it provides information not only about the shape and size but also related to the growth strategy of these plants.
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    Open Access
    A Retrospective Analysis of Indoor CO2 Measurements Obtained with a Mobile Robot during the COVID-19 Pandemic
    (MDPI, 2024) Palacín Roca, Jordi; Rubies, Elena; Clotet Bellmunt, Eduard
    This work presents a retrospective analysis of indoor CO2 measurements obtained with a mobile robot in an educational building after the COVID-19 lockdown (May 2021), at a time when public activities resumed with mandatory local pandemic restrictions. The robot-based CO2 measurement system was assessed as an alternative to the deployment of a net of sensors in a building in the pandemic period, in which there was a global stock outage of CO2 sensors. The analysis of the obtained measurements confirms that a mobile system can be used to obtain interpretable information on the CO2 levels inside the rooms of a building during a pandemic outbreak.
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    Embargo
    Energy saving potential of variable thermophysical envelope energy storage technologies in different climatic regions
    (Elsevier, 2024) Ji, Pengcheng; Guo, Yong; Weschler, Louise B.; Cabeza, Luisa F.; Zsembinszki, Gabriel; Yang, Rui; Zhang, Yinping
    Climate change mitigation necessitates higher use of renewable energy in buildings instead of fossil fuels. There is great potential to achieve this goal when the thermophysical properties of a building envelope are variable. To identify the ideal variable thermophysical properties (specific heat and thermal conductivity) for building envelopes located in given climate regions, an inverse problem approach based on particle swarm optimization (PSO) was employed. The energy consumptions of rooms were calculated when the building envelope thermophysical properties are ideally variable or constant for seven representative cities located in five climatic regions in China. The results show that when the thermal conductivity of exterior wall is ideally variable, the energysaving ratio can reach 7-15 % in seven cities, corresponding to energy saving amount of 0.03-0.78 kgce/(m2⋅year), and when the specific heat of interior building envelope is ideally variable, the energy saving ratio can reach 37-100 %, corresponding to energy saving amount of 0.21-3.06 kgce/(m2⋅year). The corresponding annual CO2 emission reduction is between 0.02 and 1.90 kg/(m2⋅year) and between 0.10 and 8.07 kg/(m2⋅year), respectively. Variable thermophysical properties have highest energy-saving and CO2 emission reduction potential in the severe cold region. Conversely, in the moderate temperature region, their impact is insignificant. The present study can help to provide direction for developing materials ith variable thermophysical properties for building envelopes in different climate regions.