22 results on '"Simões, Nuno"'
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2. Experimental characterisation of hygrothermal properties of a 3D printed cementitious mortar
- Author
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Pessoa, Sofia, Jesus, Manuel, Guimarães, Ana S., Lucas, Sandra S., and Simões, Nuno
- Abstract
3D printing (3DP) presents great potential for automation, sustainability, and quality control in the construction sector. However, research on 3DP in Construction has been carried out primarily from a structural standpoint, and information on the thermal performance, comfort and energy efficiency of these solutions remains very limited. Given the importance of assessing how printed walls perform when subjected to hygrothermal solicitations, this work experimentally analyses a cement-based mortar specially developed for 3DP. An extensive laboratory campaign was carried out, and the following set of physical, hygric and thermal properties was obtained: the dry bulk density, saturation moisture content, specific heat capacity, porosity, water absorption due to capillary action, water vapour permeability, thermal conductivity (dry and moisture-dependent), and the sorption isotherm. The results show that the 3D printed cement-based mortar, which presents a dry density of 2060kg/m3and a thermal conductivity of 1.33 W/(mK), has a hygrothermal performance comparable to that of traditional cast concrete. This indicates that additional thermal insulation materials are required for appropriate thermal performance through the building envelope. Moreover, this detailed hygrothermal characterisation is suitable for design purposes, allowing the use of the obtained properties in future numerical simulations, important for studying the hygrothermal performance of printed building elements in service.
- Published
- 2023
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3. Review of the experimental methods for evaluation of windows' solar heat gain coefficient: From standardized tests to new possibilities.
- Author
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Abolghasemi Moghaddam, Saman, Simões, Nuno, and Gameiro da Silva, Manuel
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SOLAR heating ,SOLAR technology ,STANDARDIZED tests ,EVALUATION methodology ,PHOTOVOLTAIC power systems - Abstract
One of the most important properties of a glazing system is the solar heat gain coefficient (SHGC, or g-value) which quantifies the passive solar thermal gains. There are several standardized numerical methods of determining a window's g-value. However, the methods do not consider the glazing systems in real boundary conditions, and usually are subjected to assumptions and empirical parameters regarding the thermal/optical behavior of the system, and the rate of ventilation of the gap between the glazing unit and the shading device which would result in under- or over-estimation of the results. For this reason, several experimental methods for investigating the g-value of windows have been developed to be used either alone or as a supplementary method for the validation purpose. This review aims to analyze the main experimental methods for assessing the g-value of windows that have been published as international standards or as scientific papers while taking into consideration the condition of experiment (laboratory or in-situ) and the part of the window which was tested (the glazing part or the entire window). The methods reviewed here include standardized numerical methods based on spectrophotometric measurements, solar calorimetric methods, non-calorimetric and in-situ methods. This review set out to give insights into the procedure, the necessary equipment units, the advantages and disadvantages, new possibilities, and the gaps associated with each method. At the end the authors proposed an approach for comparing the reviewed methods more precisely and confidently, and for investigating the reliability of in-situ methods. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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4. Secure Remote Data Collection System Using Data Encryption
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Rodrigues, Bruno, Cardoso, Alberto, Bernardino, Jorge, Simões, Nuno, and Marques, José
- Abstract
Nowadays, getting data remotely in a secure way, becomes critical and of utmost importance. The simple task of data transfer can be a problem in remote environments, where the network connectivity is unstable and can be unavailable for some period of times. In this paper is proposed a secure remote monitoring system with data encryption, which collects data from diverse sensors and display them to authenticated users, through charts in a website, with the option of exporting data using an Excel file format. The system created was tested with a hydraulic laboratory setup, where data is collected by a remote Data Logger, transmitted to a server and stored in a non-relational database by an encrypted data transmission that protects its integrity. The results obtained with the developed tests, regarding the success in data transmission, give good perspectives for its usability at a larger scale.
- Published
- 2019
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5. Modelling of layers interactions on the structural behaviour of insulating glasses. Vertical deflection analyses
- Author
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Zacchei, Enrico, Simões, Nuno, Vieira, Antonio, Esteves, Miguel, and Silva, Helder
- Abstract
Insulating glasses (IGs) are composed by glass plates entrapping a cavity filled with a gas sealed by perimeter spacers. This composition pretends to guarantee higher energy efficiency and airborne sound insulation in buildings. The structural performances achieved by these IGs is not normally considered in detail. In fact, in codes there is no specific mechanical model for structural IGs under different loadings and boundary conditions, namely to estimate the vertical deflections when applied horizontally. For this, here a specific model, by combining some existing approaches, was proposed for two or four side supported IG under distributed/linear loadings. The main goal is to quantify if an IG follows a monolith or layered behaviour. Several analytical and numerical analyses using a finite element method (FEM) have been carried out. Then, the results have been validated against experimental laboratory measurements. Two specific IGs with different sizes have been used as case studies. Results show that FEM analyses of IGs are in close agreement with experimental measurements, whereas analytical code models are not as accurate as the numerical approach, in particular for two side supported IGs under linear loadings. Also, the effects of the gas and the interactions between superior and bottom glasses for a large IG are more relevant than for a small IG.
- Published
- 2023
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6. A sensitivity analysis of a cost optimality study on the energy retrofit of a single-family reference building in Portugal
- Author
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Tadeu, Sérgio, Tadeu, António, Simões, Nuno, Gonçalves, Márcio, and Prado, Racine
- Abstract
Improvement of the energy efficiency of residential buildings must ensure compliance with cost optimality criteria, assuming a specific lifespan of the building. At the same time, the energy retrofit of buildings ought to preserve their intrinsic architectural and heritage value. Portuguese residential buildings constructed before 1960 did not follow any energy efficiency rules. They represent 29% of the housing stock in the country and there is a high potential for increasing their energy efficiency. However, it costs more to implement envelope energy efficiency measures through retrofitting works than to provide for them in new buildings. An evaluation based on cost optimality criteria should therefore be performed. This work evaluates the energy performance of a Portuguese reference building typical of the pre-1960 building stock for different thicknesses of thermal insulation retrofit solutions (roof, facade, and ground floor) and systems. The study describes a sensitivity analysis that took a range of climate data, intervention costs, energy prices, discount rates, and energy needs into account. An energy needs factor dealt with the occupants’ habits and the effective reduction of energy consumption compared with the estimated energy needs.
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- 2018
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7. A comparison between cost optimality and return on investment for energy retrofit in buildings-A real options perspective.
- Author
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Tadeu, Sérgio Fernando, Alexandre, Rafael F., Tadeu, António J.B., Antunes, Carlos Henggeler, Simões, Nuno A.V., and Silva, Patrícia Pereira da
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RATE of return ,SUSTAINABLE buildings ,GENETIC algorithms ,ENERGY conservation in buildings ,DECISION making - Abstract
European Union (EU) regulations aim to ensure that the energy performance of buildings meets the cost-optimality criteria for energy efficiency measures. The methodological framework proposed in EU Delegated Regulation 244 is addressed to national authorities (not investors); the optimal cost level is calculated to develop regulations applicable at domestic level. Despite the complexity and the large number of possible combinations of economically viable efficiency measures, the real options for improving energy performance available to decision makers in building retrofit can be established. Our study considers a multi-objective optimization approach to identify the minimum global cost and primary energy needs of 154,000 combinations of energy efficiency measures. The proposed model is solved by the NSGA-II multi-objective evolutionary algorithm. As a result, the cost-optimal levels and a return on investment approach are compared for a set of suitable solutions for a reference building. Eighteen combinations of retrofit measures are selected and an analysis of the influence of real options on investments is proposed. We show that a sound methodological approach to determining the advantages of this type of investment should be offered so that Member States can provide valuable information and ensure that the minimum requirements are profitable to most investors. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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8. First report of the parasite crustacean Leidya distorta(Isopoda: Bopyridae) on the fiddler crab Uca spinicarpa(Decapoda: Brachyura) in Yucatán coasts, Mexico
- Author
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Romero-Rodríguez, Jesús, Guillén-Hernández, Sergio, and Simões, Nuno
- Abstract
Parasitic isopods, particularly members of the Bopyridae that infest crustacean hosts, have received scant study in many geographic regions. As part of a project aimed at documenting parasites of fish and invertebrates from the coast of Yucatán, Mexico, 2,467 individuals of the fiddler crab Uca spinicarpawere collected from March 2002 to July 2007. Based on the sampled specimens, we report the presence of Leidya distortain the branchial chamber of U. spinicarpafor the first time. We found a prevalence of 3.77%, mean intensity of 1.47, and mean abundance of 0.06 for this parasite. With the addition of L. distorta, the number of bopyrids reported from Mexican coasts increases to 44 species. Males of U. spinicarpawere more often infested than females, which could be due to the sex ratio being strongly skewed towards males in the host sample studied (0.85:0.15M:F). Morphological differences between males and juveniles, as well as between sub-adult and adult females of L. distortaare described.
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- 2017
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9. Corrigendum to “Modelling of layers interactions on the structural behaviour of insulating glasses. Vertical deflection analyses” [Case Stud. Constr. Mater. 18 (2023) 2129]
- Author
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Zacchei, Enrico, Simões, Nuno, Vieira, Antonio, Esteves, Miguel, and Silva, Helder
- Published
- 2023
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10. IN-SITU THERMAL RESISTANCE EVALUATION OF WALLS USING AN ITERATIVE DYNAMIC MODEL.
- Author
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Barreto TADEU, António Jóse, SIMÕES, Nuno, SIMÕES, Inês, PEDRO, Filipe, and ŠKERGET, Leopold
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This paper proposes and validates a numerical iterative model to evaluate the thermal resistance of multilayer systems (walls) when in a dynamic state. First, the validation is performed numerically, then the second step of validation uses the temperature and heat flux values recorded during experimental tests performed in a hot box chamber. These validations involve comparing the results obtained with those expected, given the thermal properties of each material and thickness of each wall layer. The paper first presents the analytical solution for simulating heat transfer by conduction in the frequency domain, through the multilayer system. This is generated by imposing temperatures on the external surfaces, when the thermal properties of the materials are known. The model is then modified by assuming the wall is composed of a single layer with unknown thermal properties. The temperatures and heat fluxes, provided earlier by the analytical model and imposed on the external surfaces, lead to a nonlinear system that can be solved for the unknown thermal properties. It is solved by implementing an iterative approach based on the Newton-Raphson method. After the validation of the proposed model, this is used to evaluate the thermal resistance of a multilayered wall subjected to real conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2014
11. Thermographic inspection of external thermal insulation systems with mechanical fixing
- Author
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Hsieh, Sheng-Jen (Tony), Zalameda, Joseph N., Simões, Nuno, Simões, Inês, Serra, Catarina, and Tadeu, António
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- 2015
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12. Transient conduction and convection heat transfer across a multi-layer floor subjected to multiple heat sources.
- Author
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Simões, Nuno and Tadeu, António
- Subjects
HEAT transfer ,FOURIER transforms ,ENERGY transfer ,FOURIER analysis - Abstract
Abstract: This paper analyses the transient heat transfer across multi-layer floors subjected to multiple heat sources. The formulation that is proposed to solve this problem uses analytical expressions handling both conduction and convection phenomena. The Green''s functions (analytical expressions) for the layered formation are established by imposing the continuity of temperatures and heat fluxes at the medium interfaces between the various layers. The heat field inside a layer is obtained by adding the contribution of the direct heat incident field, generated as in an unbounded medium, to the heat produced by a set of virtual surface heat sources, that take into account the presence of the interfaces. The technique used to deal with the unsteady state conditions consists of first computing the solution in the frequency domain and then applying (fast) inverse Fourier transforms into space-time. [Copyright &y& Elsevier]
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- 2006
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13. Heat conduction across double brick walls via BEM.
- Author
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Branco, Fernando, Tadeu, António, and Simões, Nuno
- Subjects
HEAT conduction ,BOUNDARY element methods ,HYGROTHERMOELASTICITY - Abstract
The Boundary Element Method (BEM) is used to compare the steady-state heat and moisture diffusion behaviour across double brick walls provided by two different models: in the first one, the brick wall is assumed to be composed of a set of homogeneous layers bonded together, which is the model frequently used to predict internal condensation; in the second model, the geometrical modelling and hygrothermal properties of the individual bricks are taken into account.The BEM is implemented allowing the use of multi boundaries, which permits the full discretization of the brick cavities.Three different construction solutions are analysed. In the first, the double-brick wall is assumed not to be thermally insulated; in the second, the space between the two layers of bricks is filled with thermal insulation material; in the third solution, both the space between the brick layers and the holes of the inner brick layer are filled with thermal insulating material. [Copyright &y& Elsevier]
- Published
- 2004
- Full Text
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14. Steady-state moisture diffusion in curved walls, in the absence of condensate flow, via the BEM: a practical Civil Engineering approach (Glaser method).
- Author
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Tadeu, António, Simões, Nuno, and Branco, Fernando
- Subjects
CONDENSATION ,HEAT transfer ,VAPOR pressure - Abstract
The influence of the curvature radius of curved walls on the condensation patterns across a single panel homogeneous wall is analysed under steady-state conditions. Condensation is defined according to the Glaser approach, which is a practical tool in building design, recommended by the DIN 4108 and prEN ISO 13788 standards. This methodology uses an iterative process, which requires the resolution of temperature equilibrium and several vapour pressure equilibrium problems. Each of these potential problems is solved using the Boundary Element Method (BEM). The iterative process is first implemented and validated by applying it to the definition of condensation patterns across a hollow cylinder, for which the solution is calculated analytically. The BEM is then applied to the curved wall models, identifying the zones where condensation occurs and quantifying the amount of liquid water generated. [Copyright &y& Elsevier]
- Published
- 2003
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15. First record of Ophioderma ensiferum(Echinodermata: Ophiuroidea) from the southeastern continental shelf of the Gulf of Mexico and from an anchialine cave
- Author
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Quetzalli Hernández-Díaz, Yoalli, Solís-Marín, Francisco A., Simões, Nuno, and Sanvicente-Añorve, Laura
- Abstract
Two specimens of Ophioderma ensiferumHendler and Miller, 1984 were collected at 2 different localities in the Yucatán Peninsula, Mexico. The first one collected at Alacranes Reef, Yucatán, a transition zone between the Gulf of Mexico and the Caribbean, and the second one in an anchialine cave located in Cozumel Island, Quintana Roo. These records expand the known distribution of the species to the southern part of the continental shelf of the Gulf of Mexico. This finding represents the first record of this ophiuroid on the continental shelf of Mexico, and also the first record of this species in an anchialine cave.
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- 2013
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16. Can vacuum insulation panels be cost-effective when applied in building façades?
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Simões, Nuno, Gonçalves, Márcio, Serra, Catarina, and Resalati, Shahaboddin
- Subjects
VACUUM insulation ,OFFICE buildings ,LIFE cycle costing ,ECONOMIC change ,THERMAL insulation ,INSULATING materials - Abstract
A key factor for achieving nearly-zero energy buildings is to reduce their energy demand using highly efficient thermal insulation materials, such as vacuum insulation panels (VIPs). Currently, the high investment cost of VIPs is hindering the technology penetrating the building market. However, their high thermal performance coupled with reduced thicknesses can lead to economic benefits associated with space savings, significantly changing the economic standing of VIPs. This study presents a comprehensive life cycle cost (LCC) analysis of the application of VIPs in external thermal insulation composite systems (ETICS) in office building façades performed from the landlord perspective. The proposed LCC methodology, based on the EU cost-optimal regulation, allows for comparing the cost-effectiveness of VIPs with conventional insulation materials, taking full account of the additional rental income due to space savings. Energy calculations are performed based on transient heat transfer. The study takes into account varying parameters, such as location, cost of materials, insulation thickness, and rental prices, among others. The results demonstrate that VIPs can be economically viable, in particular in cities where office full-leasing rental prices are high. The range of VIP and rental prices that make their use in buildings cost-effective are identified. For example, it is shown that for rental costs higher than 350 €/(m
2 .y) VIP can be cost-effective for a current market price of 3000 €/m3 , when local climate demands for thermal transmittance bellow 0.19 W/(m2 .K). This analysis is useful for VIP manufacturers, project owners and landlords that may be looking for competitive insulation products. • Global costs for a vacuum panel system are compared with conventional insulation. • A methodology for life cycle cost analysis, including rental costs, is used. • Energy balance is determined with transient calculations for a unit area of wall. • The influence of changing several technical and economic parameters is discussed. • VIPs can be found to be cost-effective for buildings in high rent locations. [ABSTRACT FROM AUTHOR]- Published
- 2021
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17. Integrated environmental, energy and cost life-cycle analysis of windows: Optimal selection of components.
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Saadatian, Shiva, Simões, Nuno, and Freire, Fausto
- Subjects
COST analysis ,WINDOWS ,ENERGY consumption of buildings ,LIFE cycle costing ,ENVIRONMENTAL economics - Abstract
There is an increasing need for energy-efficient windows; however, these windows can have high embodied impacts and can be costly. This has not been thoroughly analyzed and the literature has mainly focused on the operational performance of windows. It is important to wisely select optimal windows that minimize energy consumption, costs, and environmental impacts throughout their life cycle, considering the influence of window orientation and climate data. This article presents an integrated cost and environmental life-cycle assessment (LCA) of window solutions, combining alternative glazing and framing options. Optimal window solutions were selected using a Pareto bi-objective optimization (costs vs. environmental impacts) for three different European climate regions, considering various window orientations. The influence of each window component (glazing and framing), as well as window properties (thermal transmittance and solar factor) on the overall environmental and cost life-cycle impacts was studied. Pareto optimal window solutions for warm climates highlight low solar factor windows, while for cold climates they highlight low thermal transmittance value. The glazing is the component with the greatest influence on the total environmental impacts (mainly operational). The impacts depend to a very great extent on the thermal transmittance values and solar factors. The life-cycle cost analysis shows that the initial investment in the windows has a high impact on the overall cost, even when a lifespan of 30 years is considered. This article provides insights into and recommendations for the design of windows by addressing different climatic conditions and window orientations. • Trade-offs between environmental impacts and costs of windows are presented. • The influence of climate and orientation on window performance is investigated. • West-facing windows have higher impacts due to the larger energy needs. • In warm climates, low solar factor contributes significantly to reduce impacts. • Window thermal transmittance is key to reduce impacts in cold climates. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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18. Comparative life cycle assessment of different vacuum insulation panel core materials using a cradle to gate approach.
- Author
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Resalati, Shahaboddin, Okoroafor, Tobechi, Henshall, Paul, Simões, Nuno, Gonçalves, Márcio, and Alam, Mahmood
- Subjects
CORE materials ,VACUUM insulation ,ENVIRONMENTAL impact analysis ,INSULATING materials ,THERMAL conductivity - Abstract
The global market trend for Vacuum Insulation Panels (VIPs) is projecting a significant increase in their uptake in the construction sector. This is mainly due to the uniquely high-performance properties of the ultra-thin insulation materials. This uptake, however, can potentially be hindered by the VIPs' higher cost and environmental impacts when compared with conventional insulation materials. This paper, for the first time, presents a detailed evaluation of the environmental impact of the most common type of VIPs currently used in different applications with a focus on alternating the core material as the main contributing component to their footprint. Pyrogenic silica, glass fibre, expanded polystyrene, aerogel and a silica/sawdust hybrid core were analysed from cradle to gate. The study, on a comparative basis, demonstrates the sensitivity of the various environmental impact categories to the internal vacuum pressure and the subsequent thermal conductivity values. The results show a lower environmental impact for glass fibre and low density expanded polystyrene compared to the other alternatives. Pyrogenic silica, the most common core material, had the highest environmental impact out of the core materials considered. The higher environmental impacts of pyrogenic silica suggest that measures such as the recycling of the core material alongside the deployment of eco-friendlier manufacturing techniques should be considered if the material is to compete environmentally with the other alternative materials. Image 1 • Environmental impact of different VIP core materials was compared for the first time. • Cradle to gate approach has been adopted for the analyses in accordance with EN15804. • Sensitivity analyses conducted for internal vacuum pressure and core material EPDs. • Pyrogenic silica had the highest environmental impact of the core materials studied. • Glass fibre had the lowest environmental impact for vacuum pressures lower than 10Pa. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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19. Comparison between cork-based and conventional green roof solutions.
- Author
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Simões, Nuno, Almeida, Ricardo, Tadeu, António, Brett, Michael, and Almeida, João
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GREEN roofs ,THERMAL resistance ,WATER storage ,GEOTHERMAL resources ,HEAT pipes ,THERMAL insulation ,BUILDING operation management - Abstract
Green roofs are increasingly being used to improve the energy balance and stormwater management of buildings. This work examines the thermal behaviour, water drainage and vegetation growth of two green roof systems: a conventional system containing extruded polystyrene and polyethylene, and an alternative cork-based system. In the new system, an eco-friendly expanded cork layer is used to provide thermal resistance and water storage capacity in a more sustainable way, as cork is a natural material. This material can also be used as an uncoated finishing layer for architectural purposes. The main goal of this work was to see if the new system is reliable in real environmental conditions and to compare its behaviour to that of the conventional system for a full year. This work presents the results of a fully functioning prototype built in Portugal with a technical substrate 10 cm thick and planted with a variety of vegetation. The reference and proposed systems were installed side by side and monitored under spring, summer, autumn and winter conditions. The thermal insulation and the water drainage and storage capacity provided by the cork-based green roof were found to be similar to those of the reference solution, with the expanded cork layer showing a more marked temperature delay and a more effective management of rainfall events under dry conditions. Additionally, it was found that the growth and health of plants in the cork-based green roof were comparable to those of the reference solution, indicating the good performance of the cork system. • An innovative cork-based green roof system was compared with a conventional solution. • Thermal, drainage and vegetation behaviour were assessed under real conditions. • More pronounced temperature delays were exhibited by the cork-based system. • The cork-based system was more effective at managing the drainage of the first rainfall event. • Vegetation development was similar for the two green roofs compared here. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
20. Spatial assessment of the vulnerability of benthic communities to multiple stressors in the Yucatan Continental Shelf, Gulf of Mexico.
- Author
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Ocaña, Frank A., Pech, Daniel, Simões, Nuno, and Hernández-Ávila, Iván
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BENTHIC animals ,ECOLOGICAL assessment ,CONTINENTAL shelf ,BENTHIC ecology ,OCEAN acidification ,MARITIME shipping - Abstract
Here, we show a spatially explicit assessment of the vulnerability of benthic communities from the Yucatan Continental Shelf (YCS) to multiple pressures: fishing activities, shipping traffic, storms and hurricanes, and marine acidification. The vulnerability index was obtained by combining benthic biological traits with exposure and sensitivity and recovery capacity; this was then represented in a spatially explicit model. Moreover, we estimated a cumulative vulnerability index using three different scenarios that were based on 1) equal weight for each vulnerability layer to each stressor, 2) results of expert consultation and 3) a linear reduction in the weight of the pressures. By comparing scenarios, the synergistic and antagonistic effects of the multiple stressors were determined. The main results showed that, independent of the considered scenario, approximately 90% of the YCS presented moderate to high vulnerability to cumulative pressures, while areas with high recovery and high potential impact on a particular stressor showed low or moderate vulnerability to the pressures. Meanwhile, areas classified as having medium impact levels and low recovery capacities of benthic fauna showed moderate to high vulnerability to the same threats. Our findings also showed that ship traffic and marine acidification were the threats that contributed to the greatest vulnerability. The paired comparison of scenarios allows for the identification of areas with higher probabilities of synergistic effects. No antagonistic effects were detected. Overall, our results constitute the first effort to understand the ecological status of the benthic communities of the YCS and their potential vulnerability to the multiple pressures they face. • Vulnerability assessment to multiple pressures identify areas with high potential impact. • Marine traffic and ocean acidification are the main threats for the benthos. • The inclusion of benthic recovery traits improves the vulnerability assessment. • Synergistic and antagonistic impacts can be identified using pressures weighting scenarios. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
21. Thermal behaviour of a green roof containing insulation cork board. An experimental characterization using a bioclimatic chamber.
- Author
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Almeida, Ricardo, Simões, Nuno, Tadeu, António, Palha, Paulo, and Almeida, João
- Subjects
GREEN roofs ,THERMAL insulation ,CORK ,WATER storage ,CONCRETE slabs ,HEAT flux - Abstract
Green roof technology is increasingly being used to improve the energy and environmental performance of buildings. However, the description of the thermal behaviour of green roofs is very complex since it depends on several variables and relies on intricate phenomena. In this work the authors characterize a green roof system that replaces the conventional drainage and water storage polyethylene membranes with insulation cork boards (ICB). To enable the experimental characterization of this system, a double walk-in bioclimatic chamber was designed and built to recreate indoor and outdoor environmental conditions. Winter and summer environments with steady and unsteady conditions in both dry and wet states were simulated. Thermocouples and heat flux sensors were used to collect data over time from the different layers of the green roof prototypes. Measurements were first performed on a concrete slab insulated with ICB to assess the contribution of the latter to the thermal performance of the system. The effect on the heat transfer was further evaluated for systems of increasing complexity, containing first a substrate layer and then vegetation. It was noted that the substrate and vegetation layers improved the thermal insulation, and reduced heat fluxes and the thermal amplitude within the system. The vegetation layer was found to be of key importance to the overall performance of the green roof. It was also found that ICB and the substrate layers lose part of their insulation capacity when the system was wetted, although it was fully restored in the ICB layer within a few hours. • Green roof system using insulation cork boards (ICB) in the water storage layer. • Use of bioclimatic chambers that recreate environmental conditions. • Winter and summer environment conditions in both dry and wet states assessed. • ICB provides high insulation; substrate and vegetation both improve thermal delay. • After wetting, the ICB layer recovers its thermal insulation performance faster. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
22. Study of experimental parameters for IRT applications in building elements using multi-layered analytical solutions
- Author
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Hsieh, Sheng-Jen (Tony), Zalameda, Joseph N., Serra, Catarina, Simões, Nuno, and Tadeu, António
- Published
- 2015
- Full Text
- View/download PDF
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