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  • 1.
    Andersson, Jan-Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf).
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Wamming, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    State of the art – Energianvändning i den svenska sågverksindustrin2011Report (Refereed)
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  • 2.
    Andersson, Jan-Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Torkhus energijämförelse i praktiken – Sävar2016Report (Refereed)
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  • 3.
    Andersson, Jan-Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Wamming, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Sammanställning av energimätningar från EESI fas 12011Report (Refereed)
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  • 4.
    Benson, Jessica
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Jardeby, Åsa
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Pasquali, Riccardo
    Cuevas, José
    van Beek, Diane
    Goumas, Angelos
    Annunziata, Eleonora
    Rizzi, Francesco
    Cucueteanu, Soina
    Nielsen, Anne Mette
    Huberlant, Bernard
    Jaudin, Florence
    Sanner, Burkhard
    Main aspects for integration of SGE systems in Cities and Buildings: Deliverable 3.3 -2014Report (Refereed)
  • 5.
    Hamon, Camille
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Abdollahi, Elnaz
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Dahl, Jonas
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Sector coupling of district heating with the electricity system: profitability and operations (SeCoHeat)2023Report (Other academic)
    Abstract [en]

    District heating systems can play key roles in the energy transition. The transition to a production mix based on renewable intermittent generation will create a larger need for ancillary services including frequency-regulation services. District heating systems typically participate in the wholesale electricity market (the so-called day-ahead market) today but do not, in general, participate in ancillary service markets. Previous studies have shown that it is technically possible to participate in these markets and that district heating systems have a role to play in these markets in the future. This requires investigating how further integration of district heating systems with the electrical grids and markets will impact operation and planning of these units. In addition, while it may be beneficial on a system level for district heating systems to participate in ancillary service markets, district heating system owners and operators will only do so if there are economic incentives to do so. The SeCoHeat project has therefore explored topics related to the profitability for individual district heating systems to participate in other electricity markets than just the day-ahead market, such as ancillary service markets. Studying sector coupling between the heat and electricity systems requires a thorough understanding of both sectors. This project has contributed to this by bringing together experts from both sides which has led to fruitful knowledge exchanges. Furthermore, some deliverables from the SeCoHeat project have been especially written to provide introduction about the heat sector to experts from the electricity sector, and vice versa. This includes an overview of the electricity markets in which district heating systems can participate, the technical requirements to participate in these markets and explanations about how profitability of participating in these markets can be computed. This also includes explanations about how the flexibility on the heat side can be sourced and provided to the electricity system and what limits this flexibility. Another important contribution of this project is the development of a Python-based open model for scheduling district system units on an hourly basis to minimize heat and electricity production costs while maximising revenues from several electricity markets. This model has been used in this project to evaluate the additional profits of participating in ancillary service markets. The results show that substantial additional profits can be made by doing so, both in historical years and in scenarios for future years. This report is a guide to the separate deliverables produced within this project. It offers an overview of the goals, methods and results from the project. The interested reader is referred to detailed descriptions in the corresponding deliverables. The SeCoHeat project was funded by Göteborg Energi AB:s stiftelse för forskning och utveckling. The work has been performed by RISE with the support of reference group members from Göteborg Energi, Vattenfall, Svenska kraftnät, IVL Svenska Miljöinstitutet, Chalmers and Profu.

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  • 6.
    Hennessy, Jay
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy. Mälardalen University,Sweden.
    Li, Hailong
    Mälardalen University,Sweden.
    Wallin, Fredrik
    Mälardalen University,Sweden.
    Thorin, Eva
    Mälardalen University,Sweden.
    Räftegård, Oskar
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Economic feasibility of commercial heat-to-power technologies suitable for use in district heating networks2017In: Energy Procedia, ISSN 1876-6102, p. 1721-1727Article in journal (Refereed)
    Abstract [en]

    Recent improvements in heat-to-power (HtP) technologies have led to an increase in efficiency at lower temperatures and lower cost. HtP is used extensively in power generation via the steam Rankine cycle, but so far has not been used in district heating (DH). The aim of the study is to analyze the economic feasibility of using HtP technologies in a DH network. This is achieved by establishing suitable technologies and calculating the levelized cost of electricity (LCOE) under conditions that may be found in DH. The result, for the vendors, temperatures and assumptions considered, is a range of 25-292 €/MWh, excluding the cost of heat. The breadth of this range in part reflects the importance of selecting appropriate products to match the heat source temperature.

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  • 7.
    Jardeby, Åsa
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Benson, Jessica
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    National Report Sweden2015Report (Refereed)
  • 8.
    Karlsson, Annelie
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Quistgaard, Louise
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Jardeby, Åsa
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Borrhåls- och grundvattenlager. Praktisk handbok om geoenergi.2012Report (Refereed)
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  • 9.
    Lindahl, Markus
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Walfridson, Tommy
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Benson, Jessica
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Gustafsson, Ola
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Haglund Stignor, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Possibilities and constraints of grid flexible control of todays and tomorrows heat pumps2020In: 13th IEA Heat Pump Conference., 2020Conference paper (Refereed)
    Abstract [en]

    In this article possibilities and constraints of grid flexible control of heat pumps for domestic heating are investigated. By creating dynamic coalitions of heat pumps and control their power consumption, demand response can be offered to the power grid. For a functional power grid, the heat pumps electrical power consumption needs to follow the electrical grids needs accurately. Possibilities to externally control the power consumption of a ground source heat pump has been investigated. Both direct control, where the compressor speed is set directly, and indirect control, achieved with outdoor temperature sensor override, has been evaluated. For the evaluation a test cycle for laboratory testing of a heat pumps grid flexibility has been developed. Based on the test cycle, the heat pumps possibilities to follow the load profile using both direct and indirect control was tested in laboratory. Both control methods were possible to use, with the direct control being significantly more accurate. Using direct control, the power consumption of the compressor managed to be within ±10% of the stated power consumption for 97% of the time.

  • 10.
    Lycken, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad, Produktion och processer.
    Nilsson, Daniel
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    SågELS – bakgrund och framtagningsprocess2016Report (Refereed)
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  • 11.
    Nilsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Hargö, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Cygnaeus, Joakim
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Rosen, Mikael
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    FASTIGHETSNÄRA SÄSONGSLAGRING AV FJÄRRVÄRME2016Report (Other academic)
    Abstract [en]

    The project is based on an idea that industrial waste heat and other available base load heat production can be distributed through district heating during summer, stored locally close buildings where the stored heat can be recovered for heating purposes during winter. This without further use of heat sources. The overall goal has been to evaluate the possibilities for “close-to-building” seasonal storage of district heating in combination with low energy and low temperature building technologies. The project has been undertaken in cooperation between Devcco and SP Technical Research Institute of Sweden. A reference group with representatives from Energiföretagen, Skanska, Akademiska hus, Göteborg Energi, Tekniska Verken i Linköping, E.ON and Umeå Energi has been available to the project team. In a system perspective close-to-building seasonal storage of district heating would result in increased summer production and decreased winter production on the margin provided that the alternative is a standard district heating delivery. In order to evaluate profitability, close-to-building seasonal storage of district heating has been compared to normal district heating in a LCC perspective. Environmental impacts have been calculated based on several alternative principles for environmental assessments of electricity production and district heating allocation. The simulated storages are standard bore hole storages charged with district heat from May through September. It is assumed that storages are basically empty by the end of April. Three type buildings representing common large buildings and blocks of various size have been included in the study. The three types are 1) new energy efficient office building, 2) older energy renovated office building and 3) energy renovated large residential building (“miljonprogram”). Calculations of environmental and financial pros and cons are based on what specific types of production that are being used on the margin during different parts of the year for a given district heating system. The analysis rests on two different production mixes inspired by the systems in Stockholm and Gothenburg. Under certain preconditions the possibilities to achieve environmentally beneficial results by introduction of close-to-building seasonal storage of district heating are good. When applying a methodology fully considering marginal consequences on the energy system, the result is that seasonal storage is environmentally beneficial. If applying a methodology considering average energy system values, the result is the opposite. From a financial perspective close-to-building seasonal storage of district heating is competitive for two of the three type buildings under the precondition that heat with a marginal production cost of approximately 50 SEK/MWh is available for charging. The results are strongly dependant on local conditions and what environmental methodology that is used. Hence, a model where the user can make indicative calculations based on relatively basic input regarding building demand and district heating system has been developed.

  • 12.
    Nordman, Roger
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad, Produktion och processer.
    Andersson, Jan-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Roadmap för energieffektivisering i svensk sågverksindustri2016Report (Refereed)
  • 13.
    Nordman, Roger
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Sågverk som energisystem och möjligheter till processintegration2011Report (Refereed)
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  • 14.
    Norén, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Uppföljning av klimat och energianvändning i Södra Climate Arena2015Report (Refereed)
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  • 15.
    Olsson, Marcus
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Räftegård, Oskar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Andersson, Jan-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf).
    Wamming, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Dokumentation till sågverksmodellen inom projekt EESI – Energi Effektivisering i SågverksIndustrin2011Report (Refereed)
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  • 16.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    GRETA - Värdeskapande värmeåtervinning - delrapport sand2023Report (Other academic)
    Abstract [en]

    To recover heat from foundry sand to heat at such a high temperature that the heat is easy to use and distribute in the form of heating water or district heating requires sand coolers designed with that purpose. These exist but are not proven in the foundry industry. This report describes case studies that evaluated the issue at a Swedish sand foundry.

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  • 17.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    GRETA - värdeskapande värmeåtervinning - delrapport svalnande gjutgods2023Report (Other academic)
    Abstract [en]

    GRETA - value adding heat recovery - report cooling of castings

    In the case study at a Swedish iron foundry, the opportunity of recovering waste heat from cooling goods has been studied. Probably, the most reasonable practical solution is to place the goods in a cooling hut/cooling oven after the break away of sand and mould. The cooling hut’s air cools the goods under controlled conditions. The air, in turn, can be cooled with hot cooling water, which in turn would be cooled by district heating. Alternatively, the hot air can be used directly to heat up nearby facilities. The foundry already has heat recovery from induction furnace cooling water and from compressed air units to a district heating network. The need for about 70°C heat is already saturated, while there is a demand for about 100°C heat. There is also plenty of 100°C waste heat, both in goods and sand. An alternative outlet could therefore be heat-driven electricity production. However, the electricity efficiency for this will be low, perhaps 5-10%. The remaining heat needs to be cooled, e.g. with surface water.

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  • 18.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    GRETA - Värdeskapande värmeåtervinning - delrapport värmebehandlingsugn2023Report (Other academic)
    Abstract [en]

    GRETA - value adding heat recovery - report heat treatment furnace

    Recovering heat from exhaust gas from heat treatment furnaces is technically simple and provides high temperature heat, e.g. 100°C heating water/district heating or steam. The process has been evaluated at Swedish steel foundry. A fairly rough estimate is that just under 50% of the used fuel (net calorific value a.k.a lower heating value) can be recovered from the flue gas assuming a standard burner is used. If the burner is regenerative/recuperative or oxy-fuel type, the amount of residual exhaust heat is significantly reduced, to perhaps 15-20% of the fuel input. Additional heat is available at lower temperatures, e.g. for preheating ventilation air. In the longer term, the transition to a sustainable society may change the amount of available exhaust gases, e.g. if electric furnaces without exhaust gases take over the market from combustion furnaces, or if e.g. fuel and oxygen prices in the future favour oxy-fuel burners. An accumulator tank that holds the heat equivalent to a batch is likely to be needed if the heat is to be used for comfort heating or similar purposes.

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  • 19.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    GRETA - Värdeskapande värmeåtervinning - huvudrapport2023Report (Other academic)
    Abstract [en]

    GRETA - Value adding heat recovery - main report

    The main report summarises the results of the case studies and for the waste heat sources for two heat demands. The waste heat sources are cooling systems for induction furnaces and compressed air, and heat recovery from goods, sand and heat treatment furnaces. The heat demands are district heating (incl. internal comfort heating) and heat-driven power generation. The case study at Baettr shows good availability and temperature in both sand and goods, but the sand is easier to access than the goods. The case study at Smålands stålgjuteri shows good availability, accessibility and temperature for recovery of exhaust gas heat from the heat treatment furnace. Both case studies show that the foundry's internal comfort heat demand is poorly matched to the supply in terms of availability. District heating is a good alternative if it is accessible (distance and interest from the utility). The supply of heat-driven power plants is limited, the electrical efficiency can be expected to be 5-10% of the supplied drive heat.

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  • 20.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    GRETA Energieffektiv processventilation2023Report (Other academic)
    Abstract [en]

    GRETA energy efficient process ventilation

    The report gives examples of measures and of the underlying theory to make process ventilation more electrically efficient in two Swedish foundries. The savings for the two studied process ventilation systems are about 90% for a steel foundry and about 20% for an iron foundry. This corresponds to about 600,000 kWh/year electricity and 200,000 kWh/year, respectively. With an assumed electricity price of 1 SEK/kWh, this amounts to SEK 600,000/year and SEK 200,000/year respectively. In both cases, the measures consist of adapting air flows to the operating case by regulating the fan using a frequency converter. The theory section shows that the distance between the source of the pollution and the exhaust has a very large impact on electricity for fan operation, but that other measures besides reducing the distance are also important. Suggestions for practical methods to tune process exhausts include the use of smoke flares that provide a clear visual response to capture capability before and after a change.

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  • 21.
    Räftegård, Oskar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Andersson, Jan-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Torkhus energijämförelse i praktiken – Bygdsiljum2016Report (Refereed)
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    FULLTEXT01
  • 22.
    Räftegård, Oskar
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Dahl, Jonas
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Flexibility opportunities in a CHP and district heating system2023Report (Other academic)
    Abstract [en]

    In this report, flexibility is discussed in terms of the ability of a unit or a system of units to change their electricity production or consumption to participate in these ancillary services. In district heating units, the electrical flexibility is strongly correlated with the thermal flexibility which in turn is very site specific. This report makes some proposals on what measures could be carried out to improve flexibility and grade them by implementation difficulty and cost estimates. Most of the measures refer to some upgrades in CHP plants to increase these plants’ flexibility potential towards the ancillary servics. These measures affect not only the electricity output of CHP plants but also the heat output. The report also discusses several means to access heat supply flexibility, to support the CHP plants’ power flexibility. This report also serves as an easy introduction to heat production in district heating systems and, in particular to CHP plants, targeted at experts in other fields to get a basic understanding of some technical aspects and limitations of district heating systems.

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  • 23.
    Räftegård, Oskar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Gehlin, Signhild
    Barth, Johan
    Gustafsson, Mattias
    Hellström, Göran
    Javed, Saqib
    Jonasson, Per
    Lundqvist, Per
    Tjernström, Johan
    Energin under markska upp till ytan - Strategisk innovationsagenda för geoenergi2016Report (Other academic)
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    fulltext
  • 24.
    Räftegård, Oskar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Gellin, signhild
    Svenskt Geoenergicentrum.
    Energin under mark ska upp till ytan - Strategisk innovationsagenda för geoenergi2016Report (Other academic)
    Abstract [sv]

    Syftet med denna innovationsagenda är att skapa den strategi som saknas för att synliggöra geoenergins behov av forskning, utveckling och innovation gentemot näringsliv och myndigheter. Det finns ett stort behov av en långsiktig finansieringsplan för geoenergiforskning och innovation i Sverige, för att upprätthålla och vidareutveckla forskargrupperna och Sveriges ledande position inom området. Idag består den svenska forskningen av cirka 14 heltidstjänster på universitet, institut och företag. Detta är lågt i förhållande till den befintliga användningen av geoenergi i Sverige, cirka 19 TWh förnybar värme och kyla, vilket är värt cirka 15 miljarder kronor i konsumentledet. Det är även lågt i förhållande till möjligt framtida bidrag till en hållbar samhällsutveckling i Sverige och utomlands

    Download full text (pdf)
    fulltext
  • 25.
    Räftegård, Oskar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Olsson, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Wamming, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Guideline till mätschema för energimätningar vid sågverk2011Report (Refereed)
    Download full text (pdf)
    FULLTEXT01
  • 26.
    Räftegård, Oskar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Nordman, Roger
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Nattfall – Nattvandringar för effektivare energianvändning2016Report (Refereed)
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    FULLTEXT01
  • 27.
    Wallin, Elin
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Fornell, Rickard
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Räftegård, Oskar
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Walfridson, Tommy
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Benson, Jessica
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Design and integration of heat recovery in combination with solar and biomass-based heating in a drying plant2020In: Chemical Engineering Transactions, ISSN 1974-9791, E-ISSN 2283-9216, Vol. 81, p. 1387-1392Article in journal (Refereed)
    Abstract [en]

    The EU27 annually generates 90 Mt of food waste, and approximately 40 % of this waste is generated during manufacturing. The food processing industry needs to develop improved and sustainable solutions for waste valorisation and re-use. The project DRALOD addresses this issue since it aims at design, integration and assessment of the performance of a heat recovery system in connection with an innovative low-temperature air drying unit where high moisture food waste is dewatered and sold as a by-product with preserved nutritional ingredients. The air used for drying is preheated using solar heat and a biomass boiler, and in this project the potential benefits of integration of a heat recovery system have been investigated. Due to the impurities available in the humid exhaust air from the dryer, the heat recovery is designed with two principal systems; a wet scrubber condensation system and a heat pump system. Simulations using hourly meteorological data from Madrid have been made for the total system with heat recovery, and the generated results have been used as inputs in a techno-economic analysis in order to assess the integration of the heat recovery and how sensitive different economic parameters and assumptions are for the results. It can be concluded from the assessment that the prices of electricity and biofuel will have a high impact on the economic performance and design. For the integration of the heat recovery system to be economically justifiable it is estimated, given assumptions made in this analysis, that the electricity cost needs to be less than 5 times higher than the biofuel cost. 

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