Blar i Fakultet for informasjonsteknologi og elektroteknikk (IE) på forfatter "Madsen, Henrik"

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    • Carbon dioxide-based occupancy estimation using stochastic differential equations 

      Wolf, Sebastian; Cali, Davide; Krogstie, John; Madsen, Henrik (Peer reviewed; Journal article, 2019)
      In the existing building stock, heating, cooling and ventilation usually run on fixed schedules, in many cases, even all day. In particular, ventilation systems often run with a constant air flow rate that is adjusted based ...

    • Characterizing the energy flexibility of buildings and districts 

      Junker, Rune Grønborg; Azar, Armin Ghasem; Lopes, Rui; Lindberg, Karen Byskov; Reynders, Glenn; Relan, Rishi; Madsen, Henrik (Journal article; Peer reviewed, 2018)
      The large penetration rate of renewable energy sources leads to challenges in planning and controlling the energy production, transmission, and distribution in power systems. A potential solution is found in a paradigm ...

    • CO2-based grey-box model to estimate airflow rate and room occupancy 

      Wolf, Sebastian; Alonso, Maria Justo; Cali, Davide; Krogstie, John; Mathisen, Hans Martin; Madsen, Henrik (Journal article; Peer reviewed, 2019)
      In the existing building stock, heating, cooling and ventilation often run on fixed schedules assuming maximal occupancy. However, fitting the control of the HVAC system to the building’s real demand offers large potential ...

    • Condition monitoring and failure prediction in complex systems 

      Presthus, Gunnhild Hardersen (Master thesis, 2014)
      We consider a monitored system W(t) at time t which is modeled by a stochastic process. Failure of the system is connected to the process overreaching a certain threshold. The system is governed by an unobservable marker ...

    • Evaluation Method for the Hourly Average CO2eq. Intensity of the Electricity Mix and Its Application to the Demand Response of Residential Heating 

      Clauß, John; Stinner, Sebastian; Solli, Christian; Lindberg, Karen Byskov; Madsen, Henrik; Georges, Laurent (Journal article; Peer reviewed, 2019)
      This work introduces a generic methodology to determine the hourly average CO2eq. intensity of the electricity mix of a bidding zone. The proposed method is based on the logic of input–output models and avails the balance ...

    • Evaluation of low-cost formaldehyde sensors calibration 

      Justo Alonso, Maria; Madsen, Henrik; Liu, Peng; Jørgensen, Rikke Bramming; Jørgensen, Thomas Berg; Christiansen, Even Johan; Myrvang, Olav Aleksander; Bastien, Diane; Mathisen, Hans Martin (Peer reviewed; Journal article, 2022)
      Low-cost sensors (LCS) are becoming ubiquitous in the market; however, calibration is needed before reliable use. An evaluation of the calibration of eight identical pre-calibrated formaldehyde LCS is presented here. The ...

    • Implementing flexibility into energy planning models : Soft-linking of a high- level energy planning model and a short-term operational model. 

      Dominkovic, Dominik Franjo; Junker, Rune Grønborg; Lindberg, Karen Byskov; Madsen, Henrik (Journal article; Peer reviewed, 2020)
      The operation of electric and heat grids alike is complicated due to the dynamic demand, with the increasing penetration of renewable energy sources adding to the problem. In order to improve the integration of variable ...

    • A Markov-Switching model for building occupant activity estimation 

      Wolf, Sebastian; Møller, Jan; Bitsch, Magnus Alexander; Krogstie, John; Madsen, Henrik (Peer reviewed; Journal article, 2019)
      Heating and ventilation strategies in buildings can be improved significantly if information about the current presence and activity level of the occupants is taken into account. Therefore, there is a high demand for ...