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Visar resultat 1 - 5 av 762 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Improved Energy Efficiency and Fuel Substitution in the Iron and Steel Industry

    Författare :Maria Johansson; Mats Söderström; Henrik Saxén; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; iron and steel industry; energy efficiency; CO2 emissions; fuel substitution; fuel switch; excess heat; biomass gasification; bio-syngas; synthetic natural gas; SNG; energy market scenarios; energy management; barriers; driving forces; järn- och stålindustrin; energieffektivisering; CO2-utsläpp; bränslebyte; överskottsvärme; restvärme; förgasning; bio-syntesgas; syntetisk naturgas; SNG; energimarknadsscenarier; energiledning; hinder; drivkrafter;

    Sammanfattning : IPCC reported in its climate change report 2013 that the atmospheric concentrations of the greenhouse gases (GHG) carbon dioxide (CO2), methane, and nitrous oxide now have reached the highest levels in the past 800,000 years. CO2 concentration has increased by 40% since pre-industrial times and the primary source is fossil fuel combustion. LÄS MER

  3. 2. The open absorption system : energy savings in different applications

    Författare :Lars Johansson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

    Sammanfattning : The open absorption system is a technique that makes it possible to recover energy in different processes using moist air. In most applications the latent heat in moist air is difficult to recover because of the low temperature. Processes using outdoor air to carry away moisture therefore have high energy demands. LÄS MER

  4. 3. Development of Concentrating Photovoltaic-Thermal Solar Collectors

    Författare :João Gomes; Björn O. Karlsson; Mats Rönnelid; Göran Lundgren; Heimo Zinko; Högskolan i Gävle; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Solar Energy; Photovoltaic-Thermal PVT ; Concentration; Collector Testing; Silicon Cell Encapsulation; Ray Tracing; Market Survey; String Layout; Prototype Collectors; Solenergi; Fotovoltaisk-termisk PVT ; Koncentration; Solfångarprovning; Inkapsling av kiselceller; Strålgångsberäkning; Marknadsundersökning; Strängdesign; Solfångarprototyper; Hållbar stadsutveckling; Sustainable Urban Development;

    Sammanfattning : Fossil fuels have greatly improved human living standards and saved countless lives. However, today, their continued use threatens human survival, as CO2 levels rise at an unprecedented pace to levels never seen during human existenceon earth. LÄS MER

  5. 4. Efficient energy use in different applications

    Författare :Lars Johansson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiteknik; Energy Engineering;

    Sammanfattning : There is a steadily growing awareness for environmental issues caused by the increased energy use, mainly in the industrial world. The use of fossil fuels has reached the point where it can not be looked at as an endless source, the resources are decreasing at a pace where alternative energy sources will be a necessity for this and future generations. LÄS MER

  7. 5. Simulation of Indoor Radon and Energy Recovery Ventilation Systems in Residential Buildings

    Författare :Keramatollah Akbari; Konstantinos Kyprianidis; Anestis Kalfas; Mälardalens högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy saving; Radon; Heat recovery ventilation; Residential building; CFD; Energy- and Environmental Engineering; energi- och miljöteknik;

    Sammanfattning : This study aims to investigate the effects of ventilation rate, indoor air temperature, humidity and using a heat recovery ventilation system on indoor radon concentration and distribution.Methods employed include energy dynamic and computational fluid dynamics simulation, experimental measurement and analytical investigations. LÄS MER