Research Interests: Mechanical Engineering, Computer Science, Monte Carlo Simulation, Monte Carlo, Neural Network, and 13 moreGreen Energy, Green, Energy Balance, Solar Collector, Mathematical Model, Nonlinear system, Interdisciplinary Engineering, Fault Tolerant, Perceptron, Artificial Neural Network, Neural Network Model, Engineering System, and heat pipe
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Research Interests: Optics and Concentrator
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The International Energy Agency (IEA) is an autonomous body within the framework of the Organization for Economic Co-operation and Development (OECD) based in Paris. Established in 1974 after the first “oil shock, ” the IEA is committed... more
The International Energy Agency (IEA) is an autonomous body within the framework of the Organization for Economic Co-operation and Development (OECD) based in Paris. Established in 1974 after the first “oil shock, ” the IEA is committed to carrying out a comprehensive program of energy cooperation among its members and the Commission of the European Communities. The IEA provides a legal framework, through IEA Implementing Agreements such as the Solar Heating and Cooling Agreement, for international collaboration in energy technology research and development (R&D) and deployment. This IEA experience has proved that such collaboration contributes significantly to faster technological progress, while reducing costs; to eliminating technological risks and duplication of efforts; and to creating numerous other benefits, such as swifter expansion of the knowledge base and easier harmonization of standards. The Solar Heating and Cooling Programme was one of the first IEA Implementing Agree...
CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro,... more
CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 1069-1077. ISBN: 978-989-675-076-3
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The 2018 revision of the European Performance Building Directive (EPBD) requires that from the year 2020 onwards, all new buildings will have to be “nearly zero energy buildings”. It also further promotes smart building technologies,... more
The 2018 revision of the European Performance Building Directive (EPBD) requires that from the year 2020 onwards, all new buildings will have to be “nearly zero energy buildings”. It also further promotes smart building technologies, raising awareness amongst building owners and occupants of the value behind building automation. The European Commission also identified, in 2011, Key Enabling Technologies (KETs), which provide the basis for innovation in the EU. In the frame of the SUDOKET project, the Solar XXI building was used as a pilot case, as innovative integrated solutions and technologies are monitored and controlled. The objective of this paper is to validate a simulation of the laboratorial test room in EnergyPlus with data obtained experimentally and determine the impact of the control systems on energy needs and on thermal comfort. Two systems, in particular, were studied: the Building-Integrated Photovoltaic (BIPV) and the earth tubes. Once validated, the simulation of t...
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Buildings play an active role in the global energy consumption and are required to not only minimize their energy use, but also generate energy in a sustainable manner. The integration of renewable energies in building elements can... more
Buildings play an active role in the global energy consumption and are required to not only minimize their energy use, but also generate energy in a sustainable manner. The integration of renewable energies in building elements can improve their overall performance, as they are able to replace common construction materials, while offering both electrical and thermal energy. The scope of this paper is to present the first results of an experimental study of a Building-Integrated Photovoltaic system combined with a water storage tank (BIPV-WS), a combined integration not extensively studied yet. Both layers are separated by a ventilated air cavity, and the thermal behavior of the system was analyzed experimentally in real functioning conditions. The water tank performs as a thermal storage, maintaining a regular temperature of about 20–30 °C during a typical winter day of Lisbon for a period of 11 h. Moreover, through the ventilation of the air cavity, the heat provided by the solar p...
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The flow in a network of parallel minichannels (hydraulic diameter: 509 µm) was analysed both experimentally and numerically. A model that takes into account local and friction pressure losses was used to design and optimize the geometry... more
The flow in a network of parallel minichannels (hydraulic diameter: 509 µm) was analysed both experimentally and numerically. A model that takes into account local and friction pressure losses was used to design and optimize the geometry manifold. The flow in the network of minichannels was simulated with a computational fluid dynamics code (Fluent). A third pressure losses model with Idelchik correlation for Z distribution was also implemented. Regarding pressure drop there was a good agreement between numerical and experimental results. A new experimental technique makes it possible to measure with a simple tool the flow distribution in a network of minichannels. The technique uses a sheet of thermochromic liquid crystals in contact with the channels and a digital CCD camera to record the evolution of a temperature step front. The images recorded by the camera were split into its hue, saturation and lightness components. The hue image was threshed to get a black and white image an...
Page 1. SET 2002 1st International Conference on Sustainable Energy Technologies 12-14 June 2002, Porto, Portugal paper REN6 SIMULATION OF THE THERMAL BEHAVIOUR OF A HYBRID HEAT PIPE SOLAR COLLECTOR ...
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This paper presents first results of a project that aims at the development of new mathematical models for characterization of Solar Thermal Systems (Factory Made Systems as defined in EN 12976) that can be used in association with... more
This paper presents first results of a project that aims at the development of new mathematical models for characterization of Solar Thermal Systems (Factory Made Systems as defined in EN 12976) that can be used in association with dynamic system testing (non intrusive test method defined in the document ISO 9459-5) and which, based on the characteristic parameters defined in the adopted models, allow determination of those parameters by fitting between real test sequences and test sequences produced by the developed models, using fitting techniques independent of the models chosen for system characterization. Another important goal of the project is the validation of results for Long Term (thermal) Performance (LTP) of the solar systems, based on the models developed, by comparison with long term measurement sequences obtained by the monitoring of different system types. Installation of the testing facility for this purpose is also described in the present paper.
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Research Interests: Mechanical Engineering, Chemical Engineering, Energy, Heat Transfer, Mixed Convection, and 11 moreHeat transfer coefficient, Solar Collector, Operant Conditioning, Convective Heat Transfer, Boundary Layer, Nusselt Number, Energy Performance, Channel Flow, Forced Convection, Electrical And Electronic Engineering, and heat pipe
*Correspondence to: Sa!a Ri!at, Institute of Building Technology, School of the Built Environment, University of Nottingham, Nottingham NG7 2RD, UK RE-mail: Sa!a.Ri!at@nottingham .ac.uk Contract/grant sponsor: Commission of the European... more
*Correspondence to: Sa!a Ri!at, Institute of Building Technology, School of the Built Environment, University of Nottingham, Nottingham NG7 2RD, UK RE-mail: Sa!a.Ri!at@nottingham .ac.uk Contract/grant sponsor: Commission of the European Union (DG XII).
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ABSTRACT Experimental test standards for solar collectors do not define any procedure for estimating the uncertainty of the measured efficiency. A new method is presented in this paper and applied to a plate heat pipe solar collector. The... more
ABSTRACT Experimental test standards for solar collectors do not define any procedure for estimating the uncertainty of the measured efficiency. A new method is presented in this paper and applied to a plate heat pipe solar collector. The detailed uncertainty analysis was performed by separating the contribution of systematic and random uncertainties for each variable. The uncertainty associated with linear regression (efficiency curve) has been calculated, when variables present systematic, random and correlated systematic uncertainties. The results show that efficiency uncertainty is higher for smaller values of the parameter .
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Resumo Foi avaliado o comportamento térmico de dois colectores solares com tubos de calor, com aplicação em ciclos de micro-cogeração. O colector com tubos de calor circulares apresenta a particularidade de ser híbrido, recebendo energia... more
Resumo Foi avaliado o comportamento térmico de dois colectores solares com tubos de calor, com aplicação em ciclos de micro-cogeração. O colector com tubos de calor circulares apresenta a particularidade de ser híbrido, recebendo energia dos gases de ...
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Resumo Foi avaliado o comportamento térmico de dois colectores solares com tubos de calor, com aplicação em ciclos de micro-cogeração. O colector com tubos de calor circulares apresenta a particularidade de ser híbrido, recebendo energia... more
Resumo Foi avaliado o comportamento térmico de dois colectores solares com tubos de calor, com aplicação em ciclos de micro-cogeração. O colector com tubos de calor circulares apresenta a particularidade de ser híbrido, recebendo energia dos gases de ...