[{"_id":"project:3093","_type":"project","abstract":{"sv":"Detta projekt genomför fallstudier för tre fjärrvärmesystem, och avser att bland annat generera en databas och kartor över svenska fjärrvärmenät som har relativt bra förutsättningar för systemlösningar med storskalig solvärme och säsongslagring.Storskalig solvärme för fjärrvärme har ökat snabbt under det sista årtiondet och tekniken har kommersialiserats till exempel i Danmark med över 150 installationer. Systemlösningar med hög andel solenergi och säsongslagring i form av stora groplager finns idag i ett flertal fjärrvärmesystem. De ekonomiska förutsättningarna i Sverige är inte lika bra idag jämfört med till exempel 1990-talet, men mycket talar för att ökad konkurrens om biomassa kommer att leda till högre priser för bioenergi och därmed bättre lönsamhet för solvärme framöver.Detta projekt tar avstamp i ett mindre antal tidigare identifierade fjärrvärmesystem med bra förutsättningar för storskalig solvärme med säsongslager och genomför med utgångspunkt i dessa teknoekonomiska fallstudier för tre fjärrvärmesystem i vilka en speciell systemlösning appliceras (en kombination av koncentrerande och plana solfångare samt säsongslagring i form av groplager).Resultaten från dessa fallstudier extrapoleras i ett geografiskt informationssystem för att med hjälp av spatial analys se hur många liknande system som skulle kunna vara realistiskt genomförbara i Sverige. Projektet avser att bland annat generera en databas och kartor över svenska fjärrvärmenät som har relativt bra förutsättningar för liknande systemlösningar med storskalig solvärme och groplager."},"project_id":"P50037-1_Energi","identifier_short":"P50037-1","local_ids":{"hh":["F 2022/59","350964"]},"dates":{"start_date":"2022-10-01","end_date":"2024-09-30"},"organizations":[{"funding":[{"_id":107,"id":"202100-5000","sv":"Energimyndigheten","en":"Swedish Energy Agency"}]},{"coordinating":[{"_id":7306,"id":"202100-2908","sv":"Högskolan Dalarna","en":"Dalarna University"}]}],"people":[{"project_leaders":[{"name":"Bales, Chris","role":"principal_investigator","affiliation":[{"sv":"Högskolan i Dalarna"}]}]},{"other_personnel":[{"_id":"authority-person:33763","orcid":"0000-0001-9118-4375","name":"Persson, Urban","role":"co_investigator","affiliation":[{"_id":884000,"sv":"Akademin för företagande, innovation och hållbarhet","en":"School of Business, Innovation and Sustainability","parent":[{"_id":2804,"id":"202100-3203","sv":"Högskolan i Halmstad","en":"Halmstad University"}]}]},{"_id":"authority-person:83585","orcid":"0000-0002-6369-2222","name":"Sánchez-García, Luis","role":"research_student","affiliation":[{"_id":884000,"sv":"Akademin för företagande, innovation och hållbarhet","en":"School of Business, Innovation and Sustainability","parent":[{"_id":2804,"id":"202100-3203","sv":"Högskolan i Halmstad","en":"Halmstad University"}]}]},{"name":"Persson, Tomas","role":"co_investigator","affiliation":[{"sv":"Högskolan i Dalarna"}]},{"name":"Saini, Puneet","role":"research_student","affiliation":[{"sv":"Högskolan i Dalarna"}]}]}],"tags":[],"titles":{"sv":"Soldriven fjärrvärme med groplager för svenska förhållanden"},"total_funding":"1383324","type_of_awards":{"sv":"Projektbidrag","en":"Project grant"},"publications":[{"id":"diva2:1950984","type":"report","issued":{"date-parts":[[2025]]},"title":"Final report : Solar district heating with pit storage for Swedish conditions","language":"eng","author":[{"family":"Bales","given":"Chris","ORCID":"0009-0005-9937-4217","localId":"cba","affiliation":[{"id":"886862","name":"Högskolan Dalarna, Energiteknik"}]},{"family":"Persson","given":"Urban","affiliation":[{"name":"Högskolan i Halmstad"}]},{"family":"Saini","given":"Puneet","ORCID":"0009-0001-8459-8614","localId":"pks","affiliation":[{"id":"886862","name":"Högskolan Dalarna, Energiteknik"}]},{"family":"Ottermo","given":"Fredric","affiliation":[{"name":"Högskolan i Halmstad"}]},{"family":"Garcia Sanchez","given":"Luis","affiliation":[{"name":"Högskolan i Halmstad"}]}],"abstract":"Large-scale solar district heating has increased fast recently and is a commercial industry in Denmark with over 100 systems. Pit stores with high solar fraction exist in several of these systems. Some economic factors in Sweden are not as good as in Denmark. However, recent events have forced up the price of biomass in Sweden and other competing uses for the forest resource point to greater competition and thus higher prices, resulting in better viability for solar. The project has used geographic and geological data from e.g. SGU to identify which areas in Sweden that are potentially suitable for pit stores. The results from the screening process show that the vast majority of district heating areas have potentially suitable areas for pit storage within a reasonable distance from the network. Only 86 district heating areas do not. As there is no reliable data for the whole country for ground water level and flow, both important factors for economic viability, the results are optimistic. As to be expected, the results show large variations over the country, but in general there are more suitable areas in the south than north. The project also estimated how much heat solar and pit storage systems could potentially deliver to the district heating areas with suitable areas. If all of these identified district heating areas installed solar and pit storage systems covering 20% of their demand, 15% of Sweden’s total district heating demand would be supplied by solar. If all networks with potential areas for pit storage installed systems covering 40% of the local demand, the equivalent figure is 36%. Pre-feasibility studies for Råneå, Härnösand and Söderhamn show that the heat cost for solar heating systems is slightly higher than the current production heat cost in these networks, given the current interest rate. As the heat cost for solar is mostly dependent on the investment cost, it varies over time in principle only with the interest rate. A lower interest rate or small annual increases in fuel costs would make the studied solar heating systems economically viable. Costs, as for many other technologies, are lower for larger systems. Integration of a heat pump in the system is cost effective if the site of the pit store is in the periphery of the network and the district heating system has exhaust gas condensation. In practice there are many additional factors that can hinder building a pit store in the sites identified as suitable in the screening. The results of the screening are theoretical and are based on the assumption that none of these negative factors exist. Detailed on-site geological measurements are needed if one wants to take the next step in actually building a pit store.","NBN":"urn:nbn:se:du-50446","number-of-pages":"111","keyword":"Solar thermal; district heating; pit thermal energy storage; case study; screening; GIS analysis","publisher-place":"Borlänge","publisher":"Högskolan Dalarna","published":[{"raw":"2025-04-09T16:22:00.000+02:00"}],"created":[{"raw":"2025-04-09T16:22:04.246+02:00"}],"updated":[{"raw":"2025-11-17T10:13:49.128+01:00"}],"URL":"https://urn.kb.se/resolve?urn=urn:nbn:se:du-50446"},{"id":"diva2:2020500","type":"article-journal","status":"Published","issued":{"date-parts":[[2025]]},"title":"National spatio-technical potential for PTES in Sweden : A first-order assessment by criteria screening","language":"eng","author":[{"family":"Persson","given":"Urban","ORCID":"0000-0001-9118-4375","localId":"urbper","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Ottermo","given":"Fredric","ORCID":"0000-0002-7525-6954","localId":"freott","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Sánchez-García","given":"Luis","ORCID":"0000-0002-6369-2222","localId":"luisan","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Saini","given":"Puneet","ORCID":"0009-0001-8459-8614","affiliation":[{"name":"Dalarna University, Falun, Sweden"}]},{"family":"Bales","given":"Chris","ORCID":"0009-0005-9937-4217","affiliation":[{"name":"Dalarna University, Falun, Sweden"}]}],"abstract":"For Sweden, a country with one of the most developed district heating sectors in the world, the continued decarbonisation of central heat supplies and the contemporary development towards lower heat distribution temperatures is generating increased interest in large-scale seasonal thermal energy storage technologies. By virtue, not only of energy storage, but also of loadshifting and peak shaving capabilities, seasonal storages are recognised today as key components in highly integrated and smart energy systems but have so far seen very limited application in Sweden. Given that Denmark, neighbour to Sweden and with a district heating development on par, is a world-leader in the application of pit thermal energy storages (PTES), this paper aims to initiate investigations into the possibilities for a similar application in Sweden. A spatial analysis sequence, akin to indicator modelling, identifies suitable areas for the construction of PTES by elimination of non-suitable areas based on a set of input data parameters and associated selection criteria, all within cost-effective heat transmission distances of aggregated district heating areas. The national potential in terms of available suitable land, expressed and discussed here by two model extremes scenarios, is generally high, but with local variations and with a characteristic latitudinal difference. ©The Author(s).2025 This is an Open Access article published by Aalborg University Open Publishing under a CC-BY-NC-ND 4.0 license.","DOI":"10.54337/ijsepm.10123","NBN":"urn:nbn:se:hh:diva-58038","volume":"47","page":"21-42","container-title":"International Journal of Sustainable Energy Planning and Management","ISSN":"2246-2929","keyword":"District heating; Pit thermal energy storage; Criteria screening; Spatial analysis; National potential","publisher-place":"Aalborg","publisher":"Aalborg Universitetsforlag","published":[{"raw":"2025-12-10T15:30:55.901+01:00"}],"created":[{"raw":"2025-12-10T15:30:55.976+01:00"}],"updated":[{"raw":"2025-12-18T15:32:28.468+01:00"}],"URL":"https://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-58038"},{"id":"diva2:1944837","type":"paper-conference","issued":{"date-parts":[[2024]]},"title":"Data categories and selection criteria for an evaluation of the potential for solar district heating with pit thermal energy storage in Sweden","language":"eng","author":[{"family":"Persson","given":"Urban","ORCID":"0000-0001-9118-4375","localId":"urbper","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Saini","given":"Puneet","affiliation":[{"name":"Dalarna University, Falun, Sweden"}]},{"family":"Sánchez-García","given":"Luis","ORCID":"0000-0002-6369-2222","localId":"luisan","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Ottermo","given":"Fredric","ORCID":"0000-0002-7525-6954","localId":"freott","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Bales","given":"Chris","affiliation":[{"name":"Dalarna University, Falun, Sweden"}]}],"abstract":"This paper is the second of three accounts which describes a Swedish study aiming to derive a first order assessment of the national potential for large-scale solar thermal heat production with pit thermal energy storage's (PTES) connected to existing district heating systems (DHS). Whereas the first paper presented project objectives, outset parameters, and an updated Swedish district heating database – and the third is planned to report on the final project results and conclusions – this paper focuses on the assembled study data and the associated selection criteria applied to these data categories under the objective to distinguish suitable (and non-suitable) land areas within cost-efficient heat transmission distances from the existing DHS. The approach centres around a principal spatial analysis with superposition of study data and elimination of non-suitable land areas according to the used selections criteria but also entails a wide periphery of related activities, such as literature reviews, gathering of technology preferences, meetings with sector experts, data management etc. Apart from technical specifications for solar heat production and seasonal storage, key data categories for the spatial analysis consist of geological data (e.g. soil types, soil depth, bedrock etc.), hydrological data (lakes, rivers, wells, soil moisture, ground water levels etc.), geographical data (elevation, built-up areas, administrative units etc.), and thematic data (energy statistics, building heat demands, district heat deliveries etc.). Selection criteria for the relevant data categories have been defined iteratively during e.g. expert consultancy, for example minimum soil depth, preferred soil types, maximum feasible transmission distance to existing DHS etc. By application of the selection criteria, raw input data are converted to processed data extracts to be used in the final analysis. Study data categories are illustrated and summarised (raw and processed) together with a listing and discussion of the used selection criteria.","NBN":"urn:nbn:se:hh:diva-55640","page":"159-159","container-title":"Book of Abstracts : 10th International Conference on Smart Energy Systems","event":"10th International Conference on Smart Energy Systems, Aalborg, Denmark, 10-11 September, 2024","keyword":"District heating systems; Solar thermal; Pit thermal energy storage; Data management; Selection criteria; Geographical information systems","publisher-place":"Aalborg, Denmark","note":"[ed] Aalborg University","published":[{"raw":"2025-03-17T10:20:00.000+01:00"}],"created":[{"raw":"2025-03-17T10:20:48.305+01:00"}],"updated":[{"raw":"2025-10-01T15:12:25.566+02:00"}],"URL":"https://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-55640"},{"id":"diva2:1882884","type":"paper-conference","issued":{"date-parts":[[2024]]},"title":"Evaluating the Potential for Solar District Heating with Pit Thermal Energy Storage in Sweden","language":"eng","author":[{"family":"Saini","given":"Puneet","affiliation":[{"name":"Department of Energy and Construction Engineering, Dalarna University, Falun, Sweden"}]},{"family":"Persson","given":"Urban","ORCID":"0000-0001-9118-4375","localId":"urbper","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Sánchez-García","given":"Luis","ORCID":"0000-0002-6369-2222","localId":"luisan","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Ottermo","given":"Fredric","ORCID":"0000-0002-7525-6954","localId":"freott","affiliation":[{"id":"884000","name":"Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet"}]},{"family":"Bales","given":"Chris","affiliation":[{"name":"Department of Energy and Construction Engineering, Dalarna University, Falun, Sweden"}]}],"abstract":"Sweden was among the first countries to install solar thermal plants for district heating (DH) as early as in 1970s. However, in recent years, the focus on solar DH installations has shifted primarily to Denmark and Germany, with only one recent installation reported in Sweden. Nonetheless, due to changes in the overall heating market, the use of large-scale storage (both with and without solar heat) is becoming increasingly important. Despite significant advancements in adopting DH systems, the combination of solar DH with PTES is not well studied from Swedish context. The economic and geological prerequisites for the deployment of PTES remain largely unexplored. This paper explores the integration of large-scale solar thermal systems into DH networks in Sweden, particularly highlighting the feasibility and potential of pit thermal energy storage (PTES) systems. Through findings from a national project, this paper assesses the techno-economic-geological viability of PTES alongside solar thermal collectors, providing insights into the project’s methodological approach and initial findings.","DOI":"10.52825/isec.v1i.1214","NBN":"urn:nbn:se:hh:diva-54257","volume":"1","container-title":"International Sustainable Energy Conference - Proceedings","event":"ISEC 2024 – 3rd International Sustainable Energy Conference, Graz, Austria, 10-11 April, 2024","keyword":"District Heating; Solar Thermal; Pit storage; Geological analysis; Techno-economic analysis","publisher":"TIB Open Publishing (Technische Informationsbibliothek)","note":"[ed] Christian Fink; Christoph Brunner","published":[{"raw":"2024-07-08T11:52:17.658+02:00"}],"created":[{"raw":"2024-07-08T11:52:17.725+02:00"}],"updated":[{"raw":"2025-10-01T15:28:51.546+02:00"}],"URL":"https://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-54257"}],"links":[{"type":"pid","link":"https://hh.diva-portal.org/smash/api/project/swecris/project:3093"}]}]