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  • 1.
    Awan, Muhammad Rizwan
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Riaz, Fahid
    Nabi, Zahid
    Analysis of conditions favourable for small vertical axis wind turbines between building passages in urban areas of Sweden2017Ingår i: International Journal of Sustainable Energy, ISSN 1478-6451, E-ISSN 1478-646X, Vol. 36, nr 5, s. 450-461Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents the analysis of installing the vertical axis wind turbines between the building passages on an island in Stockholm, Sweden. Based on the idea of wind speed amplification due to the venture effect in passages, practical measurements were carried out to study the wind profile for a range of passage widths in parallel building passages. Highest increment in wind speed was observed in building passages located on the periphery of sland as wind enters from free field. Wind mapping was performed in the island to choose the most favourable location to install the vertical axis wind turbines (VAWT). Using the annual wind speed data for location and measured amplification factor, energy potential of the street was calculated. This analysis verified that small vertical axis wind turbines can be installed in the passage centre line provided that enough space is provided for traffic and passengers.

  • 2.
    Hadi Jafari, Pantea
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wingren, Anders
    Meva Energy AB, Hisings Backa.
    Hellström, J. Gunnar I.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Gebart, Rikard
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Effect of process parameters on the performance of an air-blown entrained flow cyclone gasifier2019Ingår i: International Journal of Sustainable Energy, ISSN 1478-6451, E-ISSN 1478-646XArtikel i tidskrift (Refereegranskat)
    Abstract [en]

    Entrained flow gasification of biomass in a cyclone reactor combined by a gas engine has been applied in Nordic countries as one of the preferred methods for generating combined heat and power in small scales. The purpose of the current study was to optimise the gasification plant efficiency and understanding the influence of operating conditions. The experiments were carried out in a 2.4 MW(th) commercial gasification power plant. The gasifier was operated in optimum at a rather low lambda around 0.27 and a temperature of 950°C. The lower heating value of the clean product gas at this lambda was 5.95 MJ/Nm3. The experimental results also were compared with the predicted values from thermodynamic equilibrium calculations by Factsage 7.0. The performance of five different types of biofuels including torrefied spruce, peat, rice husk, bark and stemwood were assessed and compared with each other using thermodynamic equilibrium and available experimental data.

  • 3. Hejri, M.
    et al.
    Mokhtari, H.
    Azizian, M. R.
    Söder, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.
    An analytical-numerical approach for parameter determination of a five-parameter single-diode model of photovoltaic cells and modules2016Ingår i: International Journal of Sustainable Energy, ISSN 1478-6451, E-ISSN 1478-646X, Vol. 35, nr 4, s. 396-410Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Parameter extraction of the five-parameter single-diode model of solar cells and modules from experimental data is a challenging problem. These parameters are evaluated from a set of nonlinear equations that cannot be solved analytically. On the other hand, a numerical solution of such equations needs a suitable initial guess to converge to a solution. This paper presents a new set of approximate analytical solutions for the parameters of a five-parameter single-diode model of photovoltaic (PV) cells and modules. The proposed solutions provide a good initial point which guarantees numerical analysis convergence. The proposed technique needs only a few data from the PV current-voltage characteristics, i.e. open circuit voltage Voc, short circuit current Isc and maximum power point current and voltage Im; Vm making it a fast and low cost parameter determination technique. The accuracy of the presented theoretical I–V curves is verified by experimental data.

  • 4.
    Polatidis, Heracles
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Morales, Jan Borràs
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Increasing the applicability of wind power projects via a multi-criteria approach: methodology and case-study2016Ingår i: International Journal of Sustainable Energy, ISSN 1478-6451, E-ISSN 1478-646X, Vol. 35, nr 10, s. 1014-1029Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper a methodological framework for increasing the actual applicability of wind farms is developed and applied. The framework is based on multi-criteria decision aid techniques that perform an integrated technical and societal evaluation of a number of potential wind power projects that are a variation of a pre-existing actual proposal that faces implementation difficulties. A number of evaluation criteria are established and assessed via particular related software or are comparatively evaluated among each other on a semi-qualitative basis. The preference of a diverse audience of pertinent stakeholders can be also incorporated in the overall analysis. The result of the process is an identification of a new project that will exhibit increased actual implementation potential compared with the original proposal. The methodology is tested in a case study of a wind farm in the UK and relevant conclusions are drawn.

  • 5.
    Primikiri, Eleni
    et al.
    Department of Architecture, University of Patras.
    Kokkolaras, Michael
    Papalambros, Panos Y.
    Department of Mechanical Engineering, University of Michigan.
    Interpolation of energy performance data for building design decisions2006Ingår i: International Journal of Sustainable Energy, ISSN 1478-6451, E-ISSN 1478-646X, Vol. 25, nr 2, s. 79-90Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In recent years major advances have been made in the development of computational tools for architects to facilitate building performance evaluation. However, most tools require expert knowledge and remain accessible primarily to building engineers or specialized architects. This article presents a methodology of interpolating data for energy analysis to enable easier implementation of building simulation in the design process. Architects and other building project participants can visualize and analyze complex thermal performance of buildings for different design scenarios, requiring little specialized knowledge and without a burdensome computational cost

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