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Aineistot 1-20 / 23

    • A preliminary assessment of industrial symbiosis in Sodankylä 

      Haq, Hafiz; Välisuo, Petri; Kumpulainen, Lauri; Tuomi, Ville; Niemi, Seppo (Elsevier, 01.12.2020)
      article
      This study focuses on developing a possible architecture of planned industrial symbiosis in Sodankylä, Finland. The municipality of Sodankylä is considering the establishment of new businesses to boost the region's local ...

    • An application of seasonal borehole thermal energy system in Finland 

      Haq, Hafiz; Välisuo, Petri; Mesquita, Lucio; Kumpulainen, Lauri; Niemi, Seppo (Elsevier, 06 / 2021)
      article
      Borehole thermal energy system is an important component of the future low temperature heating networks. Applications of such systems are available around the world presenting various configurations. However, the mobility ...

    • B20 Fuel Compatibility with Steels in Case of Fuel Contamination 

      Sirviö, Katriina; Kaivosoja, Jonna; Nuortila, Carolin; Wang-Alho, Huaying; Niemi, Seppo; Ovaska, Teemu (MDPI, 11.08.2023)
      article
      This study evaluated the compatibility with steels for three B20 fuel samples blended from fossil diesel and used cooking oil methyl ester. One sample was untreated and its concentration of copper was analyzed as <1 ppm. ...

    • Calibration Method for the Determination of the FAME and HVO Contents in Fossil Diesel Blends Using NIR Spectroscopy 

      Wikberg, Elena; Heikkilä, Sonja; Sirviö, Katriina; Välisuo, Petri; Niemi, Seppo; Niemi, Antti (MPDI, 07.05.2021)
      article
      The European diesel fuel standard, EN590, allows a 7% (V/V) biodiesel (FAME) addition to automotive diesel fuel. The allowed addition of renewable diesel (HVO) to fossil diesel is not defined, as long as the properties of ...

    • Combustion and emission studies of a common-rail direct injection diesel engine with various injector nozzles 

      Hissa, Michaela; Niemi, Seppo; Niemi, Antti (Estonian University of Life Sciences, 2020)
      article
      Fuel injection has a critical role in an internal combustion engine and a significant effect on the quality of the fuel spray. In turn, fuel spray directly affects an engine´s combustion, efficiency, power and emissions. ...

    • Crude Tall Oil based Renewable Diesel: Performance, Emission Characteristics and Storage Stability 

      Spoof-Tuomi, Kirsi; Vauhkonen, Ville; Niemi, Seppo; Ovaska, Teemu; Lehtonen, Vilja; Heikkilä, Sonja; Nilsson, Olav (SAE International, 21.09.2021)
      article
      International policies aiming at replacing fossil fuels with bio-components are getting stronger. Hydrotreating of bio-oils is a sustainable way to produce premium quality diesel fuels from completely renewable feedstocks. ...

    • Development of a digital twin for real-time simulation of a combustion engine-based power plant with battery storage and grid coupling 

      Söderäng, Emma; Hautala, Saana; Mikulski, Maciej; Storm, Xiaoguo; Niemi, Seppo (Elsevier, 26.05.2022)
      article
      Coordinated control of combustion engine-based power plants with battery storage is the next big thing for optimising renewable energy. Digital twins can enable such sophisticated control but currently are too simplistic ...

    • Effects of Crude Tall Oil Based Renewable Diesel on the Performance and Emissions of a Non-Road Diesel Engine 

      Spoof-Tuomi, Kirsi; Vauhkonen, Ville; Niemi, Seppo; Ovaska, Teemu; Lehtonen, Vilja; Heikkilä, Sonja; Nilsson, Olav (SAE International, 21.09.2021)
      article
      Environmental concerns and government policies aiming to increase biofuel shares have led to the search for alternative fuels from a variety of renewable raw materials. The development of hydrotreated vegetable oil (HVO) ...

    • Effects of storage on the properties of rapeseed oil and alcohol blends 

      Nuortila, Carolin; Heikkilä, Sonja; Help, Riikka; Suopanki, Helena; Sirviö, Katriina; Niemi, Seppo (Estonian University of Life Sciences, 2021)
      article
      Kinematic viscosity and density are important fuel properties because they influence fuel atomisation during injection into the engine cylinder. The viscosity and density of neat vegetable oils usually are too high to allow ...

    • Emission Abatement Technology Selection, Routing and Speed Optimization of Hybrid Ships 

      Ritari, Antti; Spoof-Tuomi, Kirsi; Huotari, Janne; Niemi, Seppo; Tammi, Kari (MDPI, 30.08.2021)
      article
      This paper evaluates the effect of a large-capacity electrical energy storage, e.g., Li-ion battery, on optimal sailing routes, speeds, fuel choice, and emission abatement technology selection. Despite rapid cost reduction ...

    • Low emission engine technologies for future tier 3 legislations : options and case studies 

      Wik, Christer; Niemi, Seppo (SpringerOpen, 20.07.2016)
      article
      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 ...

    • Methanol-HVO blends for efficient low-temperature combustion : analytical research on fuel properties 

      Wang-Alho, Huaying; Sirviö, Katriina; Hissa, Michaela; Mikulsk, Maciej; Niemi, Seppo (Estonian University of Life Sciences, 01.09.2023)
      article
      Next-generation low-temperature combustion (LTC) engines can accommodate ultra-high efficiency with near-zero NOx and PM emissions. Reaction kinetics is the governing mechanism in LTC. Onboard fuel reactivity control is, ...

    • Modelling Sustainable Industrial Symbiosis 

      Haq, Hafiz; Välisuo, Petri; Niemi, Seppo (MPDI, 22.02.2021)
      article
      Industrial symbiosis networks conventionally provide economic and environmental benefits to participating industries. However, most studies have failed to quantify waste management solutions and identify network connections ...

    • Nonvolatile ultrafine particles observed to form trimodal size distributions in non-road diesel engine exhaust 

      Kuuluvainen, Heino; Karjalainen, Panu; Saukko, Erkka; Ovaska, Teemu; Sirviö, Katriina; Honkanen, Mari; Olin, Miska; Niemi, Seppo; Keskinen, Jorma; Rönkkö, Topi (Taylor&Francis, 31.07.2020)
      article
      Some recent findings regarding the negative health effects of particulate matter increase the relevance of the detailed characteristics of particulate emissions from different sources and especially the nonvolatile fraction ...

    • Real-Driving Emissions of an Aging Biogas-Fueled City Bus 

      Spoof-Tuomi, Kirsi; Arvidsson, Hans; Nilsson, Olav; Niemi, Seppo (MDPI, 02.10.2022)
      article
      Transition to low emission transportation and cleaner cities requires a broad introduction of low- and zero-carbon alternatives to conventional petrol- and diesel-powered vehicles. New-generation gas buses are a cost-effective ...

    • Real-time simulation of combined engine and electrical equipment model in Simulink RT 

      Hautala, Saana; Söderäng, Emma; Niemi, Seppo; Guangrong, Zou; Hänninen, Saara (VTT, 2021)
      bookPart
      This chapter presents steps towards real-time simulation of a combined engine and electrical equipment model in Simulink Real-Time (RT). This is a continuation of earlier work of Digital-twinning the engine research platform ...

    • Role of lubricating oil properties in exhaust particle emissions of an off-road diesel engine 

      Ovaska, Teemu; Niemi, Seppo; Sirviö, Katriina; Nilsson, Olav; Karjalainen, Panu; Rönkkö, Topi; Kulmala, Kari; Keskinen, Jorma (SAE International, 14.04.2020)
      article
      Particle number emissions from an off-road diesel engine without exhaust after-treatment were studied by using five different heavyduty lubricating oils in the engine. The study extends understanding on how the properties ...

    • Selected Fuel Properties of Alcohol and Rapeseed Oil Blends 

      Nuortila, Carolin; Help, Riikka; Sirviö, Katriina; Suopanki, Helena; Heikkilä, Sonja; Niemi, Seppo (Molecular Diversity Preservation International (MDPI), 25.07.2020)
      article
      The alcohols ethanol and 1-butanol are interesting options as blending components for renewable fuels. We studied whether it is possible to mix these alcohols with a little refined material, rapeseed oil, to obtain stable ...

    • Selective Catalytic Reduction on Filter Performance Testing on Non-road Diesel Engine 

      Spoof-Tuomi, Kirsi; Niemi, Seppo; Ovaska, Teemu; Nilsson, Olav; Heikkilä, Sonja; Ekman, Krister (SAE International, 10.05.2021)
      article
      High-efficiency lean-burn compression ignition engines are expected to continue to play an important role as a power source for non-road mobile machinery. The challenge for these engines is that they suffer both high levels ...

    • Storage stability of rapeseed methyl ester stored in a sealed barrel for seven year 

      Heikkilä, Sonja; Sirviö, Katriina; Nuortila, Carolin; Niemi, Seppo (Estonian University of Life Sciences, 2021)
      article
      Storage stability is one of the main quality parameters related to fatty acid methyl esters (FAME) biofuels. The deterioration of biofuels´ properties during storage is a more serious issue than with conventional fuels. ...