Research activities carried out by the Renewable Energy group aim to contribute to the transition to a low carbon energy system, in line with the EU priorities for Secure, Clean and Efficient Energy. These challenges require both the development of concepts, technologies and services for an increasing clean energy generation, energy efficiency and sustainable development of urban areas. Energy use has strong implications with the environment requiring also cooperation with other IDL groups, in particular regarding climate change. The group aims to bring innovative ideas to the industry, society and fellow research institutes. The research in this group is divided in 3 main areas: 1) Solar Energy, covering PV (photovoltaics) technology, systems nd remote electrification; 2) Renewable Energy Resources (in cooperation with the Atmosphere, Ocean and Climate group), covering solar resource analysis and renewable resources in the urban environment; 3) Energy & Environment in Buildings covering simplified models for building energy simulation, studies on natural ventilation among others. Emerging areas of interest within the group are energy storage and mobility.

Group Leader: João Serra

Scientific Highlights 2015

Yearly global irradiation in the campus of the Faculty of Sciences of the University of Lisbon
Cityscapes provide a complex environment, where solar radiation is unevenly distributed, especially since urban features started to propagate more and more vertically. Due to the dynamic overshadowing effects present on building surfaces, quantifying these phenomena is essential for predicting reductions in solar radiation availability that can significantly affect potential for solar energy use. Numerical radiation algorithms coupled with GIS (geographical information system) tools are a pathway to evaluate those complex effects. Accurate representation of the terrain, vegetation canopy and building structures allows better estimation of shadow patterns. Higher spatial and temporal resolutions deliver more detailed results, but models must compromise between accuracy and computation time. In this paper, models ranging from simple 2D visualization and solar constant methods, to more sophisticated 3D representation and analysis, are reviewed.


Yearly global irradiation in the campus of the Faculty of Sciences of the University of Lisbon.

Low pressure drop air filter for natural ventilation systems
In locations with poor air quality the use of natural ventilation is not suitable and buildings need to be equipped with high energy consumption HVAC (heating, ventilating, and air conditioning) systems. As natural ventilation is becoming a trend and adequate indoor air quality must be granted, the development of an air filter suitable for natural ventilation systems is needed. This work allows the use of natural ventilation in buildings where the proximity to pollution sources or noise prevented its use until now. The filter allows a reduction of 20 to 30% of the total energy consumption in buildings and promote energy efficiency and healthy indoor air. This filter has the potential to be used in buildings such as kindergartens, schools, universities, offices, museums, nursery houses, hospital wards and restaurants.



Abi Babadji

PhD Student

Ana Filipa Silva

PhD Student

Ana Rita Montes

PhD Student

Ângelo Casaleiro

PhD Student

António Vallêra

Senior Researcher

Carla Silva

Senior Researcher

Cristina Catita

Senior Researcher

Daniel Albuquerque

PhD Student

Danilo Arcentales

PhD Student

David Pêra

PhD Student

Filipe Serra

PhD Student

Guilherme Carrilho da Graça

Senior Researcher

Ivo Costa

PhD Student

Joana Baptista

PhD Student

João Bravo Dias

PhD Student

João Serra

Senior Researcher

João Silva

PhD Student

Jorge Maia Alves

Senior Researcher

José Silva

Postdoctoral Researcher

Killian Lobato

Senior Researcher

Marta Panão

Senior Researcher

Miguel Centeno Brito

Senior Researcher

Nuno Martins

PhD Student

Nuno Mateus

PhD Student

Pedro Nunes

Postdoctoral Researcher

Raquel Figueiredo

PhD Student

Rita Almeida

PhD Student

Rodrigo Silva

PhD Student

Sara Freitas

PhD Student


EDP, Portugal
imec, Belgium
NTNU, Norway
Open Renewables, Portugal
SDSIL, Portugal
Sintef, Norway
Universidade de Coimbra, Portugal
Universidade do Porto, Portugal
Universidad de Navarra, Spain
Universidad Politécnica de Madrid
, Spain
Université de Strasbourg, France
Université Toulouse III Paul Sabatier, France



Correia JM, Bastos A, Brito MC, Trigo RM (2016) The influence of the main large-scale circulation patterns on wind power production in Portugal, Renewable Energy, 102, 214-223, ISSN 0960-1481, DOI: 10.1016/j.renene.2016.10.002

Nunes P, Figueiredo R, Brito MC (2016) The use of parking lots to solar-charge electric vehicles, Renewable and Sustainable Energy Reviews, 66, 679-693, ISSN 1364-0321, DOI: 10.1016/j.rser.2016.08.015

Garrido H, Vendeirinho V, Brito MC (2016) Feasibility of KUDURA hybrid generation system in Mozambique: Sensitivity study of the small-scale PV-biomass and PV-diesel power generation hybrid system, Renewable Energy, 92, 47-57, ISSN 0960-1481, DOI:10.1016/j.renene.2016.01.08

Neves D, Brito MC, Silva CA (2016) Impact of solar and wind forecast uncertainties on demand response of isolated microgrids, Renewable Energy, 87, 1003-1015, ISSN 0960-1481, DOI: 10.1016/j.renene.2015.08.075

Panão MO, Santo C, Mateus NM, Carrilho da Graça G (2016) Validation of a lumped RC model for thermal simulation of a double skin natural and mechanical ventilated test cell, Energy and Buildings, 121, 92-103, ISSN 0378-7788, DOI: 10.1016/j.enbuild.2016.03.054

Mateus NM, Simões GN, Lúcio C, Carrilho da Graça G (2016) Comparison of measured and simulated performance of natural displacement ventilation systems for classrooms, Energy and Buildings, 133, 185-196, ISSN 0378-7788, DOI: 10.1016/j.enbuild.2016.09.057

Kosonen R, Lastovets N, Mustakallio P, Carrilho da Graça G, Mateus NM, Rosenqvist M (2016) The effect of typical buoyant flow elements and heat load combinations on room air temperature profile with displacement ventilation, Building and Environment, 108, 207-219, ISSN 0360-1323, DOI: 10.1016/j.buildenv.2016.08.037

Vale S, Heber L, Coelho PJ, Silva CAM (2016) Numerical Simulation of a Thermoelectric Generator for a Road Vehicle Application. Journal of Physics , 745, Technical sessions. DOI: 10.1088/1742-6596/745/3/032004

Marques S, Reis L, Afonso JL, Silva CAM (2016) Energy rating methodology for light-duty vehicles: geographical impact. Environ Dev Sustain (2016) 18: 1501. DOI: 10.1007/s10668-016-9776-9

Gouveia L, Graça S, Sousa C, Ambrosano L, Ribeiro B, Botrel EP, Neto PC, Ferreira AF, Silva CAM (2016) Microalgae biomass production using wastewater: Treatment and costs: Scale-up considerations. Algal Research (2016), 16, 167–176. DOI: 10.1016/j.algal.2016.03.010

Cassiano DR, Ribau J, Cavalcante F, Oliveira M, Silva CAM (2016) On-board Monitoring and Simulation of Flex Fuel Vehicles in Brazil. Transportation Research Procedia, 14, 2016, Pages 3129–3138. DOI: 10.1016/j.trpro.2016.05.253

Panão MO (2016) The overall renewable energy fraction: An alternative performance indicator for evaluating Net Zero Energy Buildings. Energy and Buildings, 127, 736-747. DOI: 10.1016/j.enbuild.2016.06.057

Carrilho da Graça G, Linden P (2016) Ten questions about natural ventilation of non-domestic buildings, Building and Environment, 107, 263-273, ISSN 0360-1323, DOI: 10.1016/j.buildenv.2016.08.007

Daish NC, Carrilho da Graça G, Linden P, Banks D (2016) Impact of aperture separation on wind-driven single-sided natural ventilation, Building and Environment, 108, 122-134, ISSN 0360-1323, DOI: 10.1016/j.buildenv.2016.08.015

Bellanger P, Slaoui A, Minj A, Martini R, Debucquoy M, Serra JM (2016), First Solar Cells on Exfoliated Silicon Foils Obtained at Room Temperature by the SLIM-Cut Technique Using an Epoxy Layer, IEEE Journal of Photovoltaics, 1–8. DOI: 10.1109/JPHOTOV.2016.2567070


Almeida RH, Brito MC (2015) A review of technical options for solar charging stations in Asia and Africa, AIMS Energy, 3 (3), 428-449. DOI: 10.3934/energy.2015.3.428

Barros B, Guerra S, Barros Z, Catita C, Fernandes J (2015) Uso de imagens de satélite para cálculo de volume em floresta de eucalipto no município de botucatu/sp, Energia na Agricultura (unesp. Botucatu), 30, 60-67. DOI: 10.17224/EnergAgric.2015v30n1p60-67

Bellanger P, Bouchard PO, Bernacki M, Serra JM (2015) Room temperature thin foil SLIM-cut using an epoxy paste: experimental versus theoretical results, Material Research Express, 2, 046203. DOI: 10.1088/2053-1591/2/4/046203

Carrilho da Graça G, Daish NC, Linden PF (2015) A two-zone model for natural cross-ventilation, Building and Environment, 89, 72-85. DOI: 10.1016/j.buildenv.2015.02.014

Freitas S, Catita C, Redweik P, Brito MC (2015) Modelling solar potential in the urban environment: State-of-the-art review, Renewable and Sustainable Energy Reviews, 41, 915-931. DOI: 10.1016/j.rser.2014.08.060

Freitas S, Serra F, Brito MC (2015) PV layout optimization: String tiling using a multi-objective genetic algorithm, Solar Energy, 118, 562-574. DOI: 10.1016/j.solener.2015.06.01

Mateus NM, Carrilho da Graça G (2015) Simplified modeling of displacement ventilation systems with chilled ceilings, Energy and Buildings, 108, 44-54, DOI: 10.1016/j.enbuild.2015.08.054

Mateus NM, Carrilho da Graça G (2015) A validated three-node model for displacement ventilation, Building and Environment, 84, 50-59. DOI: 10.1016/j.buildenv.2014.10.02

Neves D, Pina A, Silva CA (2015) Demand response modeling: a comparison between tools, Applied Energy, 146, 288–297. DOI: 10.1016/j.apenergy.2015.02.057

Neves D, Silva CA (2015) Optimal electricity dispatch on isolated mini-grids using a demand response strategy for thermal storage backup with genetic algorithms, Energy, 82, 436–445. DOI: 10.1016/

Nunes P, Farias T, Brito MC (2015) Day charging electric vehicles with excess solar electricity for a sustainable energy system, Energy, 80, 263–274.  DOI: 10.1016/

Nunes P, Farias T, Brito MC (2015) Enabling solar electricity with electric vehicles smart charging, Energy, 87, 10-20. DOI: 10.1016/

Reis F, Guerreiro C, Batista F, Pimentel T, Pravettoni M, Wemans J, Sorasio G, Brito MC (2015) Modeling the Effects of Inhomogeneous Irradiation and Temperature Profile on CPV Solar Cell Behavior, IEEE Journal of Photovoltaics, 5 (1), 112-122. DOI: 10.1109/JPHOTOV.2014.2358080

Silva JA, Platte B, Brito MC, Serra JM (2015) New doping method to obtain n-type silicon ribbons, Journal of Crystal Growth, 428, 29-34. DOI: 10.1016/j.jcrysgro.2015.07.00