Selaus Oppiaineen mukaanArtikkelitEnergiatekniikka

    • Effects of packer locations on downhole electric heater performance : experimental test and economic analysis 

      Guo, Wei; Wang, Zhendong; Sun, Youhong; Lu-Tervola, Xiaoshu; Wang, Yuan; Deng, Sunhua; Li, Qiang (MDPI, 13.01.2020)
      A downhole electric heater, which reduces heat loss along a heat insulation pipe, is a key apparatus used to ignite oil shale underground. Downhole heaters working together with packers can improve the heating efficiency ...
    • Feasibility of New Liquid Fuel Blends for Medium-Speed Engines 

      Sirviö, Katriina; Niemi, Seppo; Heikkilä, Sonja; Kiijärvi, Jukka; Hissa, Michaela; Hiltunen, Erkki (Molecular Diversity Preservation International (MDPI), 20.07.2019)
      Several sustainable liquid fuel alternatives are needed for different compression ignition (CI) engine applications. In the present study, five different fuel blends were investigated. Rapeseed methyl ester (RME) was used ...
    • Fuel blends behavior in freezing-melting phase transition 

      Sirviö, Katriina; Niemi, Seppo; Heikkilä, Sonja; Help, Riikka; Vauhkonen, Ville; Hiltunen, Erkki (Technische Akademie Esslingen, 2019)
      Several renewable and sustainable liquid fuel alternatives are needed for different compression-ignition (CI) engine applications to reduce greenhouse gas (GHG) emissions. Biodiesels, FAMEs, have been studied for long time ...
    • Impact of solar energy on the integrated operation of electricity-gas grids 

      Badakhshan, Sobhan; Hajibandeh, Neda; Shafie-khah, Miadreza; Catalão, João.P.S. (Elsevier, 15.09.2019)
      Photovoltaic energy is one of the clean and efficient energies which has been developing quickly in thelast years. As the penetration of solar plants is increasing in the electricity network, new problems havearisen in ...
    • Kinematic viscosity studies for medium-speed CI engine fuel blends 

      Sirviö, Katriina; Niemi, Seppo; Help, Riikka; Heikkilä, Sonja; Hiltunen, Erkki (Estonian Agricultural University, Faculty of Agronomy, 2018)
      Engine - driven power plants, run by diesel fuel or gas, will be needed for peaking power to keep the electricity grids stable when the production of renewable electricity, e.g. utilizing wind or solar power, is increased. ...
    • Long-Term Results of Intralesional Triamcinolone Acetonide Injections in Keloid Treatment 

      Hietanen, Kristiina; Välisuo, Petri; Kuokkanen, Hannu; Kaartinen, Ilkka (OMICS International, 07.09.2016)
      Background: Intralesional triamcinolone acetonide (TAC) injections are often used as the first alternative for treating keloid scarring. The long-term outcome of this treatment is unclear. Also, undesirable local side ...
    • Low emission engine technologies for future tier 3 legislations : options and case studies 

      Wik, Christer; Niemi, Seppo (SpringerOpen, 20.07.2016)
      Marine emission legislation such as the current IMO Tier II and upcoming IMO Tier III requirements within the revised Marpol Annex VI have been major drivers for performance development of marine engines during the latest ...
    • Natural gas-diesel reactivity controlled compression ignition with negative valve overlap and in-cylinder fuel reforming 

      Mikulski, Maciej; Balakrishnan, Praveen Ramanujam; Hunicz, Jacek (Elsevier, 15.11.2019)
      Dual-fuel reactivity controlled compression ignition combustion offers potentially superior overall efficiency and ultra-low nitrogen oxides and soot emissions. Using natural gas as the low reactivity fuel also provides ...
    • Operational profile based optimization method for maritime diesel engines 

      Nguyen, Hoang Khac; Zenger, Kai; Storm, Xiaoguo; Hyvönen, Jari (MDPI, 19.05.2020)
      This paper presents an approach to a new engine calibration method that takes the engine’s operational profile into account. This method has two main steps: modeling and optimization. The Design of Experiments method is ...
    • Performance and emission characterization of a common-rail compression-ignition engine fuelled with ternary mixtures of rapeseed oil, pyrolytic oil and diesel 

      Mikulski, Maciej; Ambrosewicz-Walacik, Marta; Duda, Kamil; Hunicz, Jacek (Elsevier, 31.10.2019)
      Biofuels are one of the short-term alternatives for reducing the well-to-wheel greenhouse gas footprint of transport. In the framework of compression-ignition engine fuels. This study investigates the feasibility of using ...
    • Performance and emissions of a medium-speed engine driven with sustainable options of liquid fuels 

      Niemi, Seppo; Hissa, Michaela; Ovaska, Teemu; Sirviö, Katriina; Heikkilä, Sonja; Nilsson, Olav; Hautala, Saana; Spoof-Tuomi, Kirsi; Suomela, Janne; Niemi, Antti; Kiikeri, Antti; Portin, Kaj; Asplund, Tomas (SAE International, 15.09.2020)
      Energy production and transport are major global contributors of greenhouse gas emissions. Both sectors should reduce their use of fossil energy sources. Pollutant emissions must also be reduced without jeopardizing energy ...
    • Performance and emissions of a non-road diesel engine driven with a blend of renewable naphtha and diesel fuel oil 

      Niemi, Seppo; Hissa, Michaela; Ovaska, Teemu; Sirviö, Katriina; Vauhkonen, Ville; Schubert, Nikolai (Technische Akademie Esslingen, 2019)
      Diesel engines are still the predominant power source in heavy-duty vehicle, non-road, marine and power generation applications globally. They are reliable stand-alone machines with a high brake thermal efficiency (BTE) ...
    • Reactivity Controlled Compression Ignition for clean and efficient ship propulsion 

      Mikulski, Maciej; Ramesh, Sudarshan; Bekdemir, Cemil (Elsevier, 01.09.2019)
      Reactivity Controlled Compression Ignition (RCCI) is commonly mentioned as a potential efficient and clean combustion concept. This study makes the first evaluation of natural gas-diesel RCCI combustion for mid-speed marine ...
    • Restoration and management of healthy wetland ecosystems 

      Xie, Dong; Wang, Qiang; Li, Zhongqiang; Mormul, Roger Paulo; Zhu, Liangdong (Hindawi, 19.04.2017)
    • Seabed sediment : a natural seasonal heat storage feasibility study 

      Mäkiranta, Anne; Martinkauppi, Birgitta; Hiltunen, Erkki (Estonian Agricultural University, Faculty of Agronomy, 2017)
      The new discovery among renewable energy resources, seabed sediment, has been utilised as a heat source for 42 houses in Vaasa since 2008. Sediment heat is annually loaded by the Sun. In this study the amount of annually ...
    • Strategies for lipid production improvement in microalgae as a biodiesel feedstock 

      Zhu, Liandong; Li, Zhaohua; Hiltunen, Erkki (Hindawi, 25.07.2016)
      In response to the energy crisis, global warming, and climate changes, microalgae have received a great deal of attention as a biofuel feedstock. Due to a high lipid content in microalgal cells, microalgae present as a ...
    • The effect of sulphur content on B20 fuel stability 

      Sirviö, Katriina; Niemi, Seppo; Heikkilä, Sonja; Hiltunen, Erkki (Estonian University of Life Sciences, 2016)
      The aim of this study was to investigate if a high amount of sulphur is favourable for the fuel blends' storage stability. The parameters that correlate with the storage stability of the fuel blends were compared with two ...
    • Utilizing Asphalt Heat Energy in Finnish Climate Conditions 

      Mäkiranta, Anne; Hiltunen, Erkki (Molecular Diversity Preservation International (MDPI), 2019)
      Geothermal energy is a form of renewable energy, which offers carbon-free solutions for heating and cooling spaces. This study evaluates the use of renewable asphalt heat energy in frozen ground conditions. Asphalt heat ...