Browsing SINTEF Open by Author "Walnum, Harald Taxt"

Now showing items 1-20 of 38

    • Analysis of monthly and daily profiles of DHW use in apartment blocks in Norway 

      Ivanko, Dmytro; Walnum, Harald Taxt; Sørensen, Åse Lekang; Nord, Natasa (Peer reviewed; Conference object; Journal article, 2020)
      Profiles of domestic hot water (DHW) use give valuable information for achieving energy saving in buildings. In this article, analysis of monthly and hourly profiles in apartment blocks in Norway was performed. The aim was ...

    • Building optimization testing framework (BOPTEST) for simulation-based benchmarking of control strategies in buildings 

      Blum, David; Arroyo, Javier; Huang, Sen; Drgoňa, Ján; Jorissen, Filip; Walnum, Harald Taxt; Chen, Yan; Benne, Kyle; Vrabie, Draguna; Wetter, Michael; Helsen, Lieve (Peer reviewed; Journal article, 2021)
      Development of new building HVAC control algorithms has grown due to needs for energy efficiency and operational flexibility. However, case studies demonstrating new algorithms are largely individualized, making algorithm ...

    • Characterization of heat load profiles in buildings and their impact on demand side flexibility 

      Walnum, Harald Taxt; Alonso, Maria Justo; Clauß, John; Lindberg, Karen Byskov (Journal article; Peer reviewed, 2019)
      A data set of heat load measurements for 197 buildings from different building categories (apartment blocks, hotels, nursing homes, offices and schools), have been analysed to evaluate the potential for peak shaving. A ...

    • COFACTOR Drammen dataset - 4 years of hourly energy use data from 45 public buildings in Drammen, Norway 

      Lien, Synne Krekling; Walnum, Harald Taxt; Sørensen, Åse Lekang (Peer reviewed; Journal article, 2025)
      To limit energy consumption and peak loads with increased electrification of our society, more information is needed about the energy use in buildings. This article presents a data set that contains 4 years (Jan. 2018- ...

    • Cost optimal investment in energy efficiency measures and energy supply system in a neighbourhood in Norway 

      Walnum, Harald Taxt; Bagle, Marius; Sørensen, Åse Lekang; Fufa, Selamawit Mamo (Peer reviewed; Journal article, 2021)
      Building renovation is a key measure to reduce energy consumption and Greenhouse gas (GHG) emissions, and ease the transition to a fully renewable energy system. This paper applies the IEA EBC Annex 75 methodology for ...

    • Demonstration of a low-cost solution for implementing MPC in commercial buildings with legacy equipment 

      Walnum, Harald Taxt; Sartori, Igor; Ward, Peder; Gros, Sebastien Nicolas (Peer reviewed; Journal article, 2024)
      Model predictive control (MPC) approaches for HVAC systems in buildings have shown potential for significant reduction of energy use and for enabling flexible operation. However, a widespread adoption is long in coming, ...

    • Developing a scenario calculator for smart energy communities in Norway: Identifying gaps between vision and practice 

      Walnum, Harald Taxt; Hauge, Åshild Lappegard; Lindberg, Karen Byskov; Mysen, Mads; Nielsen, Brita Fladvad; Sørnes, Kari (Journal article; Peer reviewed, 2019)
      Key Performance Indicators are important instruments, both in defining high-level goals (international or national) and when planning smart energy communities. However, there is often a gap between the high-level goals, ...

    • Development and analysis of hourly DHW heat use profiles in nursing homes in Norway 

      Ivanko, Dmytro; Walnum, Harald Taxt; Nord, Natasa (Peer reviewed; Journal article, 2020)
      Representative profiles for domestic hot water (DHW) heat use are the main instruments for improve- ment in operation and design of DHW systems in buildings. To improve the existing method for DHW heat use profiles development ...

    • Development and testing of load flexibility KPIs in the ZEN definition 

      Sartori, Igor; Lien, Synne Krekling; Bagle, Marius; Walnum, Harald Taxt; Manrique Delgado, Benjamin (Peer reviewed; Journal article, 2022)
      This paper discusses the flexibility KPIs proposed in the context of the Zero Emission Neighborhood (ZEN) definition for characterizing how a building or neighborhood exchanges energy with the surrounding energy system and ...

    • DHW tank sizing considering dynamic energy prices 

      Nord, Natasa; Ding, Yuemin; Ivanko, Dmytro; Walnum, Harald Taxt (Peer reviewed; Journal article, 2021)
      Due to the rapid development of the building stock in Norway, the energy use in this segment is drastically increasing. Therefore, improving the energy performance of buildings becoming an urgent problem. Among technical ...

    • Dimensjonering av varmtvannsrør i bygg – Resultater fra prosjektet VarmtVann2030 

      Stråby, Karolina; Walnum, Harald Taxt; Sørensen, Åse Lekang (SINTEF Fag;81, Research report, 2021)
      Denne rapporten presenterer prosjektresultater fra det fireårige forskningsprosjektet "VarmtVann2030 – Energi til tappevann i det norske lavutslippssamfunnet". Rapporten sammenfatter resultater fra detaljerte feltmålinger ...

    • Energibruk til varmt tappevann – Resultater fra prosjektet VarmtVann2030 

      Walnum, Harald Taxt; Sørensen, Åse Lekang; Stråby, Karolina (SINTEF Fag;80, Research report, 2021)
      Rapporten presenterer resultater som omhandler energibruk til produksjon av varmt tappevann. Prosjektresultater som gjelder dimensjonering av rørsystemer, er beskrevet i rapporten "Dimensjonering av varmtvannsrør i bygg – ...

    • Energy consumption for domestic hot water use in Norwegian hotels and nursing homes 

      Walnum, Harald Taxt; Sørensen, Åse Lekang; Ludvigsen, Bjørn; Ivanko, Dmytro (Journal article; Peer reviewed, 2019)
      Domestic Hot Water (DHW) production constitutes a significant proportion of the energy demand of modern buildings, and as the building envelope is improved the share increases. This article discusses the results from a ...

    • Energy flexibility potential of domestic hot water systems in apartment buildings 

      Sørensen, Åse Lekang; Walnum, Harald Taxt; Sartori, Igor; Andresen, Inger (Peer reviewed; Journal article, 2021)
      Domestic Hot Water (DHW) storage tanks are identified as a main source of flexible energy use in buildings. As a basis for energy management in apartment buildings, this paper describes the aggregated DHW use in a case ...

    • A flexible and robust modelling framework for multi-stream heat exchangers 

      Skaugen, Geir; Kolsaker, Kjell; Walnum, Harald Taxt; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2013)
      Heat exchangers are important units in most industrial processes. They involve physical phenomena such as condensation and evaporation including several boiling regimes. Different types of heat exchangers constructed for ...

    • Heat analysis for energy management in neighbourhoods: case study of a large housing cooperative in Norway 

      Sørensen, Åse Lekang; Lindberg, Karen Byskov; Walnum, Harald Taxt; Sartori, Igor; Aakenes, Ulf Roar; Andresen, Inger (Journal article; Peer reviewed, 2019)
      As a basis for energy management in apartment blocks, this paper characterises heat use in a large housing cooperative in Norway, with in total 1,058 apartments. Heat measurements with hourly resolution are available from ...

    • Identifying grey-box models of Norwegian apartment block archetypes 

      Bagle, Marius; Walnum, Harald Taxt; Sartori, Igor (SINTEF Proceedings;5, Chapter; Peer reviewed; Conference object, 2020)
      Identification of grey-box models to describe the heat dynamics of buildings is treated extensively in literature, However, to identify these models, data from controlled heating experiments is needed, which is not feasible ...

    • Identifying typical hourly DHW energy use profiles in a hotel in Norway by using statistical methods 

      Ivanko, Dmytro; Nord, Natasa; Sørensen, Åse Lekang; Plesser, Thale Sofie Wester; Walnum, Harald Taxt; Sartori, Igor (Journal article; Peer reviewed, 2019)
      The aim of this research is to improve the existing approaches of domestic hot water (DHW) energy use analysis in buildings. A comprehensive statistical analysis of hourly DHW energy use for a hotel in Oslo, Norway, was ...

    • Impact of activating energy demand flexibility in the building stock: A case study of Norway as a highly electrified country in the European power market 

      Backe, Stian; Delgado, Benjamin Manrique; Askeland, Magnus; Walnum, Harald Taxt; Sørensen, Åse Lekang; Sartori, Igor (Peer reviewed; Journal article, 2025)

    • Innovasjonsrapport 2020. Forskningssenteret for nullutslippsområder i smarte byer (FME ZEN) 

      Bergsdal, Håvard; Sørensen, Åse Lekang; Cervenka, Zdena; Holm, Øystein; Thomsen, Judith; Sartori, Igor; Lindberg, Karen Byskov; Stokke, Raymond Andreas; De Boer, Luitzen; Hamdan, Hasan; Holmen, Elsebeth; Wiik, Marianne Rose Kjendseth; Backe, Stian; Kauko, Hanne; Georges, Laurent; Walnum, Harald Taxt; Lien, Synne Krekling; Skaar, Christofer; Wolfgang, Ove; Brattebø, Helge; Lausselet, Carine; Resch, Eirik; Sandberg, Nina Holck; Pinel, Dimitri; Thorvaldsen, Kasper Emil; Alonso, Maria Justo; Askeland, Magnus; Petersen, Sobah Abbas; Favero, Matteo; Carlucci, Salvatore; Liu, Peng (ZEN Report;28, Research report, 2020)
      Forord. Forskning og innovasjon er grunnpilaren i vår visjon om å utvikle bærekraftige områder med null klimagassutslipp. Innovasjonskomiteen skal bistå senterledelsen i dette arbeidet gjennom å etablere gode innovasjonsprosesser ...