Aquifer thermal energy storage (ATES) system application for district heating and cooling

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorKohonen, Reijo
dc.contributor.authorTodorov Radoslavov, Oleg
dc.contributor.schoolInsinööritieteiden korkeakoulufi
dc.contributor.supervisorVirtanen, Markku
dc.date.accessioned2018-10-05T07:12:41Z
dc.date.available2018-10-05T07:12:41Z
dc.date.issued2018-09-24
dc.description.abstractAquifer thermal energy storage (ATES) systems in combination with groundwater heat pumps (GWHP) are promising and effective alternatives for integrated heating and cooling energy supply in buildings and district networks. In the present Thesis ATES systems are presented and addressed from different perspectives, such as their technical rationale, economic feasibility and environmental impact. Groundwater flow and thermal models are developed and calibrated, using a variety of available data sources (National Land Survey of Finland, Finnish Environment Institute) and tools (EXCEL, QGIS, MODFLOW, MT3DMS). Heat pump COP estimation analytical model is also implemented and coupled with the groundwater models. The purpose was to study different energy scenarios for ATES integration within the existing Pukkila's district heating network (Nivos Energia) as well as the long-term environmental flow and thermal impact generated to aquifer groundwater areas. Among the different researched scenarios, the most feasible strategy is to introduce a roughly constant cooling demand (proceeding from e.g. data center or industrial waste heat) in combination with the existing local district heating demand. The introduction of variable cooling demand using standard office simulated data is also modeled, having shown promising results. On the other hand, the "only heating" integration scenario has poor economic results, at least for the assumed present level of boiler's fuel price, and is reasonably feasible only in the case when prices increase. ATES systems are an efficient and a sustainable alternative for traditional fossil fuel boilers due to their capacity to annually store and recover cooling & heating energy from the subsurface. Significant technical and economical improvement could be achieved when simultaneous or seasonable cooling and heating loads are dispatched, within integrated district energy (heating & cooling) networks.en
dc.format.extent88+4
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/34179
dc.identifier.urnURN:NBN:fi:aalto-201810055261
dc.language.isoenen
dc.programmeMaster's Programme in Advanced Energy Solutions (AAE)fi
dc.programme.majorSustainable Energy in Buildings and Built Environmentfi
dc.programme.mcodeENG3068fi
dc.subject.keywordATES aquifer thermal energy storageen
dc.subject.keywordDH district heatingen
dc.subject.keywordDC district coolingen
dc.subject.keywordhydrogeology thermogeologyen
dc.subject.keywordgroundwater modelingen
dc.subject.keywordMODFLOW MT3DMSen
dc.titleAquifer thermal energy storage (ATES) system application for district heating and coolingen
dc.typeG2 Pro gradu, diplomityöfi
dc.type.ontasotMaster's thesisen
dc.type.ontasotDiplomityöfi
local.aalto.electroniconlyyes
local.aalto.openaccessyes
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