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  • 1.
    Widström, Torun
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Can dynamic exergy analyses be of use when evaluating strategies forenhanced energy performance in historical buildings?2010Conference paper (Refereed)
    Abstract [en]

    When retrofitting culturally valuable buildings for improved energy performance we are faced with complications on top of those of modern ones, while failure in dealing with these complications may lead to loss of irreplaceable values. Thus we need trustworthy tools and methods that can provide us with the knowledge we need to create the appropriate retrofittings, minimizing energy use while ensuring preservation of the building and its interiors and comfort for the users. Simulations that render such knowledge are therefore important for the keeping of cultural heritage. This study looks into whether a dynamic simulation of the thermal exergy aspect can supply information that contributes in the assessment of different retrofitting strategies, by making such a simulation of a 13th century church equipped with an electrical IR-heating. The conclusion is that the dynamic exergy simulation does provide the desired information, in this case proving the IR-heating defendable exergy-wise.

  • 2.
    Widström, Torun
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Enhanced Energy Efficiency and Preservation of Historic Buildings: Methods and Tools for Modeling2012Licentiate thesis, monograph (Other academic)
    Abstract [en]

    As the environmental impacts of the energy usage of the world today becomes more and more evident, enhancement of energy performance of the already existing building stock becomes more urgent. Buildings belonging to the cultural heritage are often the ones that are most difficult to deal with in this context.

    The subject of this thesis is the use of building simulation of historic buildings. The task here is to identify and when necessary develop simulation tools and methods that are suitable for planning of retrofitting strategies in historic buildings, and to identify and analyze what demands such tools and methods would have to fulfill, in what contexts different simulation strategies are suitable, how the demands on the tools might be met and what results and how the results would facilitate the decision making process in the most optimal way. A powerful means to acquire such analyses is the use of whole-building simulation. In the case of historical buildings there are several aspects to take into consideration, determining the choice of simulation tool and method.

    This thesis includes

    • Investigation of the variability of the demands on simulation tools and methods that the historic buildings pose, and its implication on complexity of the simulation process, and suggestion of a complexity index tool.
    • Investigation of the whole-building simulation process and how it complies with the demands identified, and how the exergy concept can be used, exemplified by a case study.
    • Identification of a need for a tool and method for a large amount of cases not easily covered by abundantly available tools and methods
    • Suggestion of a tool and method to address these cases, and presentation of a case study where the suggested tool and method have been applied, with good agreement between the simulated and measured values.

    One important feature of the suggested tool is the Very Small Wall-part Method, that includes the assessment of especially damage prone points into the whole-building simulation model, otherwise unable to accommodate these points. Another is the damage risk assessment feature where a mould risk prediction tool is presented.

  • 3.
    Widström, Torun
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Mattsson, Magnus
    University of Gävle.
    Multifunctional whole building simulation as a method in assessing retrofitting strategies in historical buildings2011In: Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association, 2011, p. 2943-2949Conference paper (Refereed)
    Abstract [en]

    The design of retrofitting strategies for historical buildings involves various challenges. The aim is often not only to save energy while providing acceptable indoor conditions for its users, but also to preserve the building and potential cultural artifacts, making it a multi-criteria issue, with multiple demands on the simulation tools and methods. This paper describes one way to fulfill on these demands through a serial, stepwise simulation process and a special tool, designed for that process. A case study, performed with the use of the method and tool, is presented. The results show that the method is workable and provides good agreement between simulated results and measured data.

  • 4.
    Widström, Torun
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Mattsson, Magnus
    University of Gävle.
    Simulation of the energy performance of historic buildings2011Conference paper (Refereed)
    Abstract [en]

    In historical buildings, to an even greater extent than in modern buildings, the energy performance is connected to other aspects, such as moisture performance and damage risks. Here building simulation is of value, but it also faces some challenges in the form of complexity, flexibility and stability that need to be overcome in order to render useful results. This paper suggests a new, serial approach to the simulation process and presents a new simulation tool that makes it possible.

  • 5.
    Widström, Torun
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Mattsson, Magnus
    University of Gävle.
    Whole building simulation and damage risk assessment in historical buildings2011Conference paper (Refereed)
    Abstract [en]

    When simulating historical buildings, available tools tend to be intended for simulations of either of two kinds: whole building simulations of energy-/moistureper formance, from which we can determine general conditions that may give an indication of potential damage risks, though unspecific, or detailed simulations that look into what takes place at specific points/materials, which provides us with knowledge about the specifics but without much context. Both are efficient scientific methods, but when dealing with reality we need both perspectives simultaneously. This paper describes multi-criteria simulations that take this into account, using a new tool integrating display of specific moisture-connected risk-factors into whole building simulations, providing a coherent basis for decision-making when retrofitting, and compares the results to case-study measurements.

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