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  • 1.
    Fahlén, Per
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Capacity control of air coils for heating and cooling - Transfer functions, drive power and system design2011Conference paper (Other academic)
  • 2.
    Fahlén, Per
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Jagemar, Lennart
    System design for energy efficient pump operation in buildings2011Conference paper (Other academic)
  • 3.
    Fyhr, Kristina
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Rosell, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Organisk kemi (Kmo).
    Energieffektivare ventilation i butiker - återluft2014Report (Refereed)
  • 4.
    Markusson, Caroline
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Fahlén, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Jagemar, Lennart
    Capacity control of air coils - drive power, system design and modeling of variable liquid flow air coils.2011Conference paper (Refereed)
  • 5.
    Markusson, Caroline
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Rolfsman, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Retrofitting an existing supermarket refrigeration system for higher energy efficiency2013Conference paper (Refereed)
  • 6.
    Markusson, Caroline
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Rolfsman, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Rofonte d'une installation frigorifique dans une grande surface alimentaire en vue d'une meilleure efficacité énergétique2013In: Revue générale froid et conditionnement d'air, no 1136, p. 50-55Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Ollas, Patrik
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Markusson, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Eriksson, Jörgen
    EQUA Solutions, Sweden.
    Chen, Huijuan
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Lindahl, Markus
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Quasi-Dynamic Modelling of DC Operated Ground-Source Heat Pump2020In: SINTEF Proceedings; 5, Oslo, 2020, Vol. 5, p. 208-213Conference paper (Refereed)
    Abstract [en]

    The performance of a conventional ground-source heat pump (GSHP) has been measured in the laboratory with alternating current (AC) and direct current(DC) operation using the standardised points fromEN14511:2018. The results from these measurements have been used to modify a variable speed heat pump model in IDA Indoor Climate and Energy (ICE) and the annual performance of AC and DC operation have been simulated for an entire year's operation at two geographical locations in Sweden. Results show that the energy savings with DC operation from laboratory measurements span between 1.4{5.2% and when simulating the performance for an entire year's operation, the energy savings vary between 2.5{3.4%. Furthermore, the energy savings from the simulations have been compared to the bin method described in EN14825:2018.

  • 8.
    Ollas, Patrik
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Markusson, Caroline
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Persson, Jon
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Alfadel, Usama
    Soliga Energi, Sweden.
    Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and PeakPower Demand for a Low Energy Single-Family House With PVProduction in Sweden2018In: 7th World Conference on Photovoltaic Energy Conversion (WCPEC-7), June 10-15, 2018, 2018Conference paper (Refereed)
    Abstract [en]

    This paper simulates the impact of battery sizingfor an actual nearly-zero energy (NZEB) single-family housewith solar PV located in Bor°as, Sweden. Simulations are done,using measurement data as an input, for three different batterydispatch algorithms with two different purposes; (i) peak powershaving and (ii) maximising system self-consumption (SC) andself-sufficiency (SS) of the solar PV. The results show that theoptimal battery storage size for this single-family house, givenits measured electrical loads and existing solar PV system isaround 7.2 kWh. System self-consumption and self-sufficiencyfrom generated solar PV increased with 24.3 percentage pointscompared to a reference case without battery. Furthermore,results show that increasing the battery size beyond 7.2 kWhonly results in minor performance gains.

  • 9.
    Ollas, Patrik
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Persson, Jon
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Markusson, Caroline
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy.
    Alfadel, Usama
    Soliga Energi, Sweden.
    Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and Peak Power Demand for a Low Energy Single-Family House with PV Production in Sweden2018In: 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 618-623Conference paper (Refereed)
    Abstract [en]

    This paper simulates the impact of battery sizing for an actual nearly-zero energy (NZEB) single-family house with solar PV located in Boras, Sweden. Simulations are done,° using measurement data as an input, for three different battery dispatch algorithms with two different purposes; (i) peak power shaving and (ii) maximising system self-consumption (SC) and self-sufficiency (SS) of the solar PV. The results show that the optimal battery storage size for this single-family house, given its measured electrical loads and existing solar PV system is around 7.2 kWh. System self-consumption and self-sufficiency from generated solar PV increased with 24.3 percentage points compared to a reference case without battery. Furthermore, results show that increasing the battery size beyond 7.2 kWh only results in minor performance gains.

  • 10.
    Ollas, Patrik
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources. Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Chen, Hiujuan
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Markusson, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Increased photovoltaic utilisation from direct current distribution: Quantification of geographical location impact2021In: Progress in Photovoltaics, ISSN 1062-7995, E-ISSN 1099-159X, Vol. 29, no 7, p. 846-856Article in journal (Refereed)
    Abstract [en]

    In this paper, the performance of a direct current (DC) distribution system is modelled for a single-family residential building and compared with a conventional alternating current (AC) system to quantify the potential energy savings and gains in photovoltaic (PV) utilisation. The modelling is made for two different climates to quantify the impact of the geographical location. Results show that the system losses are reduced by 19–46% and the PV utilisation increased by 3.9–7.4% when using a DC distribution system compared to an AC equivalent, resulting in system efficiency gains in the range of 1.3–8.8%. Furthermore, it is shown that the geographical location has some effect on the system's performance and PV utilisation, but most importantly, the grid interaction is paramount for the performance of the DC topology. © 2021 The Authors.

  • 11.
    Ollas, Patrik
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Chen, Huijuan
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Markusson, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Increased PV Utilisation from DC Distribution: Quantification of Geographical Impact2020In: EU PVSEC Conference Proceedings, 2020, p. 1432-1441Conference paper (Refereed)
    Abstract [en]

    In this paper, the performance of a direct current (DC) distribution system is modelled and compared fora single-family residential building with a conventional alternating current (AC) system to quantify the potential energy savings and gains in PV utilization. The modelling is also made for two different climates to quantify the impact of the geographical location. Results show that the system losses are reduced by 19-46% and the PV utilization increased by 3.9-7.4% when using a DC distribution system compared to an AC equivalent, resulting in system efficiency gains in the range of 1.3-8.8%. Furthermore, it is shown that the geographical location has some effect on the system's performance and PV utilization, but most importantly the grid interaction is paramount for the performance of the DC topology.

  • 12.
    Ollas, Patrik
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources. Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Persson, Mattias
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Markusson, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Battery loss prediction using various loss models: A case study for a residential building2023In: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538, Vol. 70, article id 108048Article in journal (Refereed)
    Abstract [en]

    This work compares and quantifies the annual losses for three battery system loss representations in a case study for a residential building with solar photovoltaic (PV). Two loss representations consider the varying operating conditions and use the measured performance of battery power electronic converters (PECs) but differ in using either a constant or current-dependent internal battery cell resistance. The third representation is load-independent and uses a (fixed) round trip efficiency. The work uses sub-hourly measurements of the load and PV profiles and includes the results from varying PV and battery size combinations. The results reveal an inadequacy of using a constant battery internal resistance and quantify the annual loss discrepancy to −38.6%, compared to a case with current-dependent internal resistance. The results also show the flaw of modelling the battery system’s efficiency with a fixed round trip efficiency, with loss discrepancy variation between −5 to 17% depending on the scenario. Furthermore, the necessity of accounting for the cell’s loss is highlighted, and its dependence on converter loading is quantified.

    Download full text (pdf)
    fulltext
  • 13.
    Ollas, Patrik
    et al.
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources. Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Persson, Mattias
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Markusson, Caroline
    RISE Research Institutes of Sweden, Built Environment, Energy and Resources.
    Energy Loss Savings Using Direct Current Distribution in a Residential Building with Solar Photovoltaic and Battery Storage2023In: Energies, E-ISSN 1996-1073, Vol. 16, no 3, article id 1131Article in journal (Refereed)
    Abstract [en]

    This work presents a comparison of alternating current (AC) and direct current (DC) distribution systems for a residential building equipped with solar photovoltaic (PV) generation and battery storage. Using measured PV and load data from a residential building in Sweden, the study evaluated the annual losses, PV utilization, and energy savings of the two topologies. The analysis considered the load-dependent efficiency characteristics of power electronic converters (PECs) and battery storage to account for variations in operating conditions. The results show that DC distribution, coupled with PV generation and battery storage, offered significant loss savings due to lower conversion losses than the AC case. Assuming fixed efficiency for conversion gave a 34% yearly loss discrepancy compared with the case of implementing load-dependent losses. The results also highlight the effect on annual system losses of adding PV and battery storage of varying sizes. A yearly loss reduction of 15.8% was achieved with DC operation for the studied residential building when adding PV and battery storage. Additionally, the analysis of daily and seasonal variations in performance revealed under what circumstances DC could outperform AC and how the magnitude of the savings could vary with time. © 2023 by the authors.

  • 14.
    Ossman, Lisa
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Ruud, Svein
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Kovacs, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Ollas, Patrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Wendin, Karin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Lane, Anna-Lena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Stensson, Sofia
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Haglund Stignor, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Alsbjer, Markus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Gustavsson, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Förbrännings- och aerosolteknik.
    Nulägesanalys för satsning på NNE byggnader: slutrapport etapp 12012Report (Other academic)
    Abstract [sv]

    Det övergripande syftet med uppdraget är att få en detaljerad bild över byggnaders energiprestanda i Sverige. Den första etappen, förstudien, går ut på att beskriva metoden för hur denna analys ska göras. Som etapp 2 genomförs själva nulägesanalysen och slut¬ligen i etapp 3 analyseras resultat och slutsatser presenteras. I denna rapport redogörs för etapp 1, dvs metodbeskrivningen för nulägesanalysen. Nulägesanalysen ska senare kunna användas för att följa upp hur satsningar på Näranoll¬energibyggnader (NNE) påverkar energianvändningen i hela byggnadsbeståndet, inte bara i de faktiska demonstrationsprojekt som beviljas stöd och där uppföljning är betydligt enklare. Resultatet av nulägesanalysen, och den uppföljande analysen (planerad till 2015), ska i förlängningen kunna vara ett stöd när de nationella målnivåerna för näranollenergi-byggnader bestäms. I denna rapport redogörs för etapp 1, dvs metodbeskrivningen för nulägesanalysen. Rapporten beskriver vilka statistikkällor som finns idag samt en metod för hur dessa kan bidra till en mer detaljerad bild av byggnaders energiprestanda under ett valt referensår.

    Download full text (pdf)
    FULLTEXT01
  • 15.
    Rolfsman, Lennart
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Borgqvist, Martin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Karlsson, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Certifiering, Ledningssystemcertifiering.
    Dörrar på öppna kyldiskar och anpassning av kylsystem i butik2014Report (Refereed)
    Download full text (pdf)
    FULLTEXT01
  • 16.
    Ruud, Svein
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Markusson, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Nordén, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad, Byggnadsfysik och innemiljö.
    Karlsson, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Lindgren, Mikael
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Ollas, Patrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Belysningen väg från el till rumstemperatur2013Report (Refereed)
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    FULLTEXT01
1 - 16 of 16
CiteExportLink to result list
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  • apa
  • ieee
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  • vancouver
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  • de-DE
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  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
  • html
  • text
  • asciidoc
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