Browsing by Author "Salonen, Teemu"

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  • Algorithm-aided design of a steel lattice conveyor bridge
    (2022-01-24) Laine, Markus
     Insinööritieteiden korkeakoulu | Master's thesis
  • Hajautettu energiantuotanto - yhdistetty sähkön ja lämmön tuotanto
    (2008) Salonen, Teemu
     Insinööritieteiden ja arkkitehtuurin tiedekunta | Bachelor's thesis
  • Integration of solar heating and district heating systems in apartment building
    (2012) Liesaho, Tuomo
     School of Engineering | Master's thesis
    The objective of this master's thesis is to establish guidelines for planning and description of an integrated heating system. For the guidelines, it is intent to study, for example, the economy of integration of solar heating and district heating systems. It is also investigated how the integration of solar heating and district heating systems impact on the carbon dioxide emissions of apartment building's energy consumption. In this master's thesis it is used literary research, interviews and TRNSYS 17 simulations. The interviews were made for district heat companies to investigate their opinion on integration. The major results of this study are mainly outcome of simulations. The simulations are made for two NCC's apartment buildings. Both apartment buildings have about 100 m2 of roof mounted solar collectors which were the maximum possible amount of collectors. The amount of annual produced solar heat was around 13 % of the total heat consumption of the apartment building. Nevertheless, the amount of annual produced solar heat per collector area was so low that the integration was not economic. After all, the integration reduced annual carbon dioxide emissions of both apartment buildings' energy consumption. When calculating the reduction of carbon dioxide emissions it was also noticed that integration heated the returning district heat water. And if district heat water returns hotter to the power plant, it will reduce efficiency of electricity production during co-production of heat and electricity. In this study it was noticed that the integration of solar and district heat systems is quite likely uneconomic especially if the price of district heat is much lower in the summertime than in the wintertime. The main reason for integration is then the matter-of-fact that the integration reduces apartment building's annual carbon dioxide emissions if the district heat is not produced with renewable energy resources. While designing the integration of solar and district heat systems, one should take into account that most of produced solar heat is used just for preheating of domestic hot water and under floor heating of bathrooms. In addition, the integration should be taken into account also in building's architectural design.
  • Maps in PDF -format; Case: Military exercise maps of the Finnish Defence Forces
    (2003) Salonen, Teemu
     Helsinki University of Technology | Master's thesis
  • Tekoälyn menetelmät teknisten järjestelmien diagnoosissa ja automatisoidussa lääketieteellisessä diagnoosissa
    (2020-09-18) Salonen, Teemu
     Perustieteiden korkeakoulu | Bachelor's thesis
  • The use of renewable energy in the oil-fired buildings managed by the city of Kirkkonummi
    (2010) Salonen, Teemu
     School of Engineering | Master's thesis
    In this thesis is examined the use of renewable energy sources in the oil-fired buildings managed by the city of Kirkkonummi. The examination contains systems which can produce heat, electricity and both together. However, the main emphasis is on the ground source heat, pellet and wood chip systems which can produce only heat. In addition, photovoltaic and solar thermal systems and small scale wind power are examined as additional systems working with the heat-generating systems. The objective of the thesis is to establish boundary conditions for the cheapest way for the city of Kirkkonummi to increase the use of renewable energy sources in various size buildings and to explore how the solutions affect greenhouse gas emissions caused by the buildings. The economic viability of the systems is examined using life cycle and levelised energy cost methods. The amount of greenhouse gas emission caused by each system is determined using carbon dioxide equivalent (CO2-eq) factors which contain only the emissions which are released from burning. Results show that in the smallest buildings (heating energy consumption <500 MWh/a) ground source heat is the most profitable option. If heat distribution system works on low temperature, then ground source heat is the cheapest option also in larger buildings. Otherwise wood chip system is the cheapest option in large buildings. From CO2-eq -emissions point of view the pellet and wood chip systems are the best options when emissions are 24 - 33 kg CO2-eq/MWh. The CO2-eq -emissions for ground source heat systems are 133 - 184 kg CO2-eq/MWh and for oil systems 310 - 338. From additional systems only the Porkkala sited 20 kW wind farm is profitable.