Browsing by Subject "district heating"

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  • Hirvonen, Janne; Heljo, Juhani; Jokisalo, Juha; Kurvinen, Antti; Saari, Arto; Niemelä, Tuomo; Sankelo, Paula; Kosonen, Risto (Elsevier, 2021)
    Sustainable Cities and Society 70 (2021), 102896
    Finland and the European Union aim to reduce CO2 emissions by 80–100 % before 2050. This requires drastic changes in all emissions-generating sectors. In the building sector, all new buildings are required to be nearly zero energy buildings. However, 79 % of buildings in Finland were built before 2000, meaning that they lack heat recovery and suffer from badly insulated facades. This study presents four large-scale building energy retrofit scenarios, showing the emission reduction potential in the whole Finnish building stock. Six basic building types with several age categories and heating systems were used to model the energy demand in the building stock. Retrofitted building configurations were chosen using simulation-based multi-objective optimisation and combined according to a novel building stock model. After large-scale building retrofits, the national district heating demand was reduced by 25–63 % compared to the business as usual development scenario. Despite a large increase in the number of heat pumps in the system, retrofits in buildings with direct electric heating can prevent the rise of national electricity consumption. CO2 emissions in the different scenarios were reduced by 50–75 % by 2050 using current emissions factors.
  • Moilanen, Fanni (Helsingin yliopisto, 2019)
    Sustainability transitions literature addresses societal challenges relating to sustainability and offers alternative visions as solutions. Transition of the energy system is central in mitigating climate change and attaining sustainability. District heating is a fundamental part of the Finnish energy system, and the majority of heat is produced with fossil fuels. This case study investigates the low temperature and two-way district heating experiment of Skanssi in Turku. Transitions evolve from local experiments i.e. niche innovations, which propose visions of sustainable alternatives. The implementation and diffusion of these alternatives is challenged by various hindrances, such as institutionalized practices. The aim of the study is to investigate the district heating experiment of Skanssi by utilizing sustainability transition literature. In addition, the study examines the institutions that hampered the implementation of the local niche innovation. The research data was collected by interviewing the central actors related to the development and implementation of the local district heating experiment. The interview data was analyzed using theory-guided content analysis. Internet based material of the case was utilized as secondary data. The local district heating experiment was initiated by the regional energy company in cooperation with the city of Turku. The experiment was expected to decrease greenhouse gas emissions and to provide decentralized heat production in the Skanssi area. The implementation of the experiment had halted in 2018, and a two-way heating system had not been realized. Slow construction of the houses in the area hindered the implementation of the experiment. In addition various regulative, normative and cultural-cognitive institutions effected the planning and implementation of the experiment. The lack of regulation concerning two-way heating systems increased uncertainty around the experiment. Furthermore, the experiment did not suit the practices, roles and interests of both the inhabitants and housing developers. The findings show that two-way district heating systems are still highly uncommon, and thus their implementation is inert and uncertain. After the data collection of this study there have been changes in the district heat sector, which may have influenced the development of the experiment in Skanssi. Since local experiments are essential in advancing the energy transition, it would be important to continue implementation of the local district heating experiment.