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  • 1. Menegon, D.
    et al.
    Persson, Tomas
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Haberl, R.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Haller, M.
    Direct characterisation of the annual performance of solar thermal and heat pump systems using a six-day whole system test2020In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 146, p. 1337-1353Article in journal (Refereed)
  • 2.
    Persson, Tomas
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Manikandan, Gokula
    Measurements of heat losses and energy labelling of storage tanks from Olle Jonsons Mekaniska, Hedemora2016Report (Other academic)
  • 3.
    Persson, Tomas
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Stavset, Ole
    SINTEF Energy Research.
    Ramstad, Randi Kalskin
    NTNU , Department of Geology and Mineral Resources Engineering.
    Alonso, Maria Justo
    SINTEF Energy Research.
    Lorenz, Klaus
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Software for modelling and simulation of ground source heating and cooling systems2016Report (Other academic)
    Abstract [en]

    The aim of this survey is to explore different simulation software for designing of ground source heating systems. Models to simulate borehole storages, heat pumps, and system components like water storages, hydraulics and building loads are explored. This study is based on a literature survey of software and models for simulation of geothermal heating and cooling systems with focus on vertical ground heat exchangers. The study focus on the software used by the authors, which are EED, TRNSYS, Polysun, Modelica, IDA ICE, and Matlab/Simulink+Carnot.  The scopes and limitations of the software and models are evaluated and the advantages and disadvantages with the software are addressed.  It was found that the user-friendliness is strongly linked to the level of flexibility in the models. Higher flexibility usually means less user-friendliness and more time to learn the tool. EED, Polysun and IDA are considered to be the more user friendly softwares, while Modelica, TRNSYS and Matlab/Simulink+Carnot are considered to be the more flexible softwares. The models covering most of the aspects of borehole simulations are the TRNSBM-model in TRNSYS and the “INTERACT 2016” model for Modelica.

  • 4.
    Persson, Tomas
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Wiertzema, Holger
    Win, Kaung Myat
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Modelling of dynamics and stratification effects in pellet boilers2019In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 134, p. 769-782Article in journal (Refereed)
    Abstract [en]

    Optimizing solar and pellet heating systems can be performed by system simulations in TRNSYS. However; this requires detailed boiler models that can properly model the thermal behaviour of the boilers, such as stratification and thermal response. This study uses a combination of existing models for modelling of the pellet burner part (TRNSYS Type 210) and the water volume (TRNSYS Type 340). This approach addresses the thermal dynamics and internal stratification more accurately than other available models. The objectives of this work are to develop a method for parameter identification for the model and to validate this method and the model itself. Sets of parameters are identified for two pellet boilers and one pellet stove with a water jacket (extended room heater) and the model is validated with a realistic dynamic operation sequence. The results show that modelling of stratification is essential in order to model the true behaviour of residential boilers. The test sequences used were adequate to parameterise the models and to provide the desired accuracy, except regarding the heat losses to room air. The model shows good accuracy for a stove and one boiler, but slightly worse performance for the other boiler regarding dynamics and modelling of the stratification.

    The full text will be freely available from 2021-01-01 15:49
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