Blar i NTNU Open på forfatter "Madsen, Henrik"

Viser treff 1-14 av 14

    • Assessment of GHG emissions from materials during building design - Methods for improved reliability and quality 

      Resch, Eirik (Doctoral theses at NTNU;2021:15, Doctoral thesis, 2021)
      Construction materials in buildings contribute significantly to climate change. Globally, nations have committed to drastic reductions of greenhouse gases (GHG), among them Norway which has committed to 50-55% reduction ...

    • 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 ...

    • climify.org: an online solution for easy control and monitoring of the indoor environment 

      Cali, Davide; Kindler, Ekkart; Ebrahimy, Razgar; Bacher, Peder; Hu, Kevin; Østrup, Michelle Lind; Bachalarz, Magnus; Madsen, Henrik (Journal article; Peer reviewed, 2019)
      Real energy performance of new and retrofitted buildings often consistently differs from expectations. While occupants might complain about poor indoor climate, the energy use in such buildings is often higher than expected, ...

    • 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 ...

    • Control of Heat Pumps with CO2 Emission Intensity Forecasts 

      Leerbeck, Kenneth; Bacher, Peder; Junker, Rune Grønborg; Tveit, Anna; Corradi, Olivier; Madsen, Henrik; Ebrahimy, Razgar (Peer reviewed; Journal article, 2020)
      An optimized heat pump control for building heating was developed for minimizing CO 2 emissions from related electrical power generation. The control is using weather and CO 2 emission forecasts as inputs to a Model ...

    • 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 ...

    • Flexbuild Annual Report 2. Technical report with results analysis 

      Sartori, Igor; Lindberg, Karen Byskov; Bagle, Marius; Sandberg, Nina Holck; Lien, Synne Krekling; Haugen, Mari; Seljom, Pernille Merethe Sire; Rosenberg, Eva; Kvalbein, Lisa; Pedrero Alonso, Raquel; Ahang, Mohammadreza; Del Granado, Pedro Crespo; Tomasgard, Asgeir; Palmer, Jaume; Kloppenborg, Jan; Madsen, Henrik (SINTEF Fag;, Research report, 2022)

    • 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 ...

    • A methodology for the selection of pollutants for ensuring good indoor air quality using the de-trended cross-correlation function 

      Justo Alonso, Maria; Wolf, Sebastian; Jørgensen, Rikke Bramming; Madsen, Henrik; Mathisen, Hans Martin (Peer reviewed; Journal article, 2021)
      CO2 is customarily used to control ventilation as it is a proxy for bio-effluents and pollutants related to the presence and activity of people in the room. However, CO2 could not be a satisfactory indicator for pollutants ...

    • Room-level occupancy simulation model for private households 

      Wolf, Sebastian; Cali, Davide; Alonso, Maria Justo; Li, Rongling; Korsholm Andersen, Rune; Krogstie, John; Madsen, Henrik (Journal article; Peer reviewed, 2019)
      This work presents a novel occupancy simulation model for residential buildings. The main contribution is that occupancy is simulated at room level, as opposed to more course spatial resolutions in previous studies. The ...