Techno-economic performance of community sized solar heating systems in Nordic conditions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Siren, Kai, Prof., Aalto University, Department of Mechanical Engineering, Finland Rehman, Hassam ur 2018-11-23T10:03:12Z 2018-11-23T10:03:12Z 2018
dc.identifier.isbn 978-952-60-8324-7 (electronic)
dc.identifier.isbn 978-952-60-8323-0 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract Regional size solar heating systems allow an efficient use of clean energy technologies and passive buildings. The objective of the thesis is on the design, techno-economic performance, optimization and comparisons of various solar heating system architectures in Nordic conditions for regional demand. These systems provide space heating, domestic hot water and electricity to the community. Detailed simulation is crucial to study the combined effect of renewable energy sources, mechanical components, storages and buildings. In the study, TRNSYS and TRNBuild are used for energy systems and building dynamic simulation respectively. MOBO is used for multi-objective optimization. The thesis includes four publications. The publications contain following topics: developing of control strategies for a basic system, long term parametric study of three systems alternatives, influence of technical failures on the performance of an optimized system, and comparison between centralized and semi-decentralized systems designs. The results showed that parallel short-term storage tanks charging, with temperature difference control at collector outlet, reduced the energy consumption by 20 %, compared to serial charging of the tanks. It is found that by placing a heat pump connected between two short term tanks, using solar charged borehole storage to charge the tank, improved the system performance. Additionally, seasonal storage charging and heat demand played an important role on the performance and investments. However, these systems are sensitive to certain technical failures, inversely they may not be sensitive to certain issues. Results showed that de-stratification, solar circulation pump control and heat pump COP can cause large deviations from the ideal conditions. Semi-decentralized system, where low temperature grid is centralized and high temperature grid is decentralized can clearly outperform centralized system, in terms of the life cycle cost by 35 %. Shape of the seasonal storage varies depending on the stored heat and distribution network typology. The renewable energy fraction of up to 92% can be attained. The thesis shows that it is technically possible to build high performing solar heating networks in Nordic climate. A simulation based optimization problem of solar district and buildings together can reach an optimal or close to optimal solution set, useful for decision makers. Large size of the community allowed the effective use of the seasonal storage and solar energy. Control of each component and optimization is necessary to gain benefits of such concept. Large systems are much cheaper by unit price because of economics of scale. With decreasing trend of the collector and PV cost, economics of such system can be altered with cheap thermal storage. The technical uncertainties should be considered while realizing these systems. To validate the system a pilot project is needed. Life cycle assessment can be done to rationalize its societal impact. en
dc.format.extent 121 + app. 79
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 238/2018
dc.relation.haspart Hassam ur Rehman, Janne Hirvonen, Kai Siren, ’Design of a simple control strategy for a community-size solar heating system with a seasonal storage’ Energy Procedia, Vol. 91 (2016), pp. 486-495. DOI: 10.1016/j.egypro.2016.06.183
dc.relation.haspart Hassam ur Rehman, Janne Hirvonen, Kai Siren, ’A long-term performance analysis of three different configurations for community-sized solar heating systems in high latitudes’, Renewable Energy, Vol. 113 (2017), pp. 479-493. DOI: 10.1016/j.renene.2017.06.017
dc.relation.haspart Hassam ur Rehman, Janne Hirvonen, Kai Siren, ’Influence of technical failures on the performance of an optimized community-size solar heating system in Nordic conditions’, Journal of Cleaner Production, Vol. 175 (2018), pp. 624-640. DOI: 10.1016/j.jclepro.2017.12.088
dc.relation.haspart Hassam ur Rehman, Janne Hirvonen, Kai Siren, ’Performance comparison between optimized design of a centralized and semi-decentralized community size solar district heating system’, Applied Energy, Vol. 229 (2018), pp. 1072-1094. DOI: 10.1016/j.apenergy.2018.08.064
dc.subject.other Energy en
dc.title Techno-economic performance of community sized solar heating systems in Nordic conditions en
dc.type G5 Artikkeliväitöskirja fi Insinööritieteiden korkeakoulu fi School of Engineering en
dc.contributor.department Konetekniikan laitos fi
dc.contributor.department Department of Mechanical Engineering en
dc.subject.keyword Solar district heating en
dc.subject.keyword multi-objective optimization en
dc.subject.keyword seasonal storages en
dc.subject.keyword Nordic climate en
dc.identifier.urn URN:ISBN:978-952-60-8324-7
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Kosonen, Risto, Prof., Aalto University, Department of Mechanical Engineering, Finland
dc.opn Heiselberg, Per Kvols, Prof., Aalborg University, Denmark
dc.contributor.lab Energy Efficiency and Systems, HVAC group en
dc.rev Martinac, Ivo, Prof., Royal Institute of Technology (KTH), Sweden
dc.rev Nord, Natasa, Assoc. Prof., Norwegian University of Science and Technology (NTNU), Norway 2018-12-17
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