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  • 1.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Energy efficiency of new residential buildings in sweden: Design and Modelling Aspects2014Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Energy security and climate change mitigation have been discussed in Sweden since the oil crisis in the 1970s. Sweden has since then increased its share of renewable energy resources to reach the highest level among the EU member states, but is still among the countries with the highest primary energy use per capita. Not least because of that, increasing energy efficiency is important and it is part of the Swedish long term environmental objectives. Large potential for improving energy efficiency can be found in the building sector, mainly in the existing building stock but also in newly constructed buildings

    In this thesis, criteria for energy efficiency in new residential buildings are studied, several design aspects of residential buildings are examined, and possible further analysis from an energy system perspective discussed. Three case studies of existing residential buildings were analysed, including one detached house and multi-storey apartment buildings. The analysis was based on both energy simulations and measurements in residential buildings.

    The results show that the calculated specific final energy demand of residential buildings, before they are built, is too rough an indicator to explicitly steer society toward lower final energy use in the building sector. One of the reasons is assumptions made during calculation before the buildings is built. Another reason is the interior building design. A design that includes relatively large areas of heated corridors, service and storage rooms will lower the specific final energy demand without improving the building energy efficiency, which might increase both the total final energy demand and the use of construction materials in the building sector.

    Efficient thermal envelopes are essential in construction of energy efficient buildings, which include the thermal resistance and also the shape of the building. The shape factor of buildings was found to be an important variable for heat demand in buildings located in temperate and colder climates, particularly if they are exposed to strong winds.

    From a system perspective, energy efficiency measures and the performance of the end use heating technology in buildings should be evaluated together with the energy supply system, including the dynamic interaction between them.

  • 2.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Energy performance of residential buildings design2016Inngår i: Society’s steering systems: a Friend book to Inga Carlman / [ed] E. Grönlund & A. Longueville, Östersund: Mid Sweden University , 2016, s. 179-186Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    Through the history of civilization, humans have built shelters to practice their social activities, while having protection against weather, wild animals, and other human beings. Over the course of time, vernacular dwellings have evolved to respond to climate challenges, available materials and cultural expectations in a given location. Such buildings include, e.g. the adobe house, the Inuit igloos in Greenland, and the open courtyard building design.Since the start of the postmodern architecture, in the middle of the 20th century, new technologies, new materials, and changes in societal structures have changed the way buildings have been designed and constructed. Modern lifestyle become more dependent on energy. For example Heating, Ventilation and Air Conditioning systems (HVAC) in buildings became widely used to improve indoor comfort. After the oil-supply crises in the middle of the 1970s, the connection between building design and the environment changed from just providing sufficient thermal comfort to promoting energy efficiency due to the awareness of the fact that natural resources are limited. That was the start of the sustainable architecture movement. It was during this time building regulations in many countries started to include aspects of energy efficiency. This chapter will discuss two aspects of building design and their effect on the overall energy efficiency of the building: the interior building design and the exterior building design.

  • 3.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Energy performance of residential buildings: projecting, monitoring and evaluating2016Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Energy security and climate change mitigation have been discussed in Sweden since the oil crisis in the 1970s. Sweden has since then increased its share of renewable energy resources to reach the highest level among the EU member states, but is still among the countries with the highest primary energy use per capita. Not least because of that, increasing energy efficiency is important and it is part of the Swedish long term environmental objectives. Large potential for improving energy efficiency can be found in the building sector, mainly in the existing building stock but also in new constructions.

    Buildings hold high costs for construction, service and maintenance. Still, their energy efficiency and thermal performance are rarely validated after construction or renovation. As energy efficiency become an important aspects in building design there is a need for accurate tools for assessing the energy performance both before and after building construction. In this thesis criteria for energy efficiency in new residential buildings are studied. Several building design aspects are discussed with regards to final energy efficiency, energy supply-demand interactions and social aspects. The results of this thesis are based on energy modelling, energy measurements and one questionnaire survey. Several existing residential buildings were used as case studies.

    The results show that pre-occupancy calculations of specific final energy demand in residential buildings is too rough an indicator to explicitly steer towards lower final energy use in the building sector. Even post occupancy monitoring of specific final energy demand does not always provide a representative image of the energy efficiency of buildings and may result with large variation among buildings with similar thermal efficiency. A post occupancy method of assessing thermal efficiency of building fabrics using thermography is presented. The thermal efficiency of buildings can be increased by design with low shape factor. The shape factor was found to have a significant effect on the final energy demand of buildings and on the use of primary energy. In Nordic climates, atria in multi-storey apartment buildings is a design that have a potential to increase both energy efficiency (by lower shape factor) and enhance social interactions among the occupants.

  • 4.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Energy variations in apartment buildings due to different shape factors and relative size of common areas2011Inngår i: World Renewable Energy Congress 2011, Linköping, Sweden, May 8-11, 2011Konferansepaper (Fagfellevurdert)
  • 5.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    How to lift students 10,000 meter up above ground2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Environment problems are complex and require a system integrated approach, which involves different time scales and spatial resolution. Yet, many parts of the world are facing similar environmental challenges. Therefore, mankind needs to share knowledge and work together across physical borders, language barriers, and cultures differences.

    In our International Master's programme in Ecotechnology and Sustainable Development in Mid-Sweden University, we use new pedagogical technologies to bring students from different nations and cultures together and reinforce teamwork. All courses in the program are in English and students can choose to be present in the classroom or to stream lectures online in real-time. Via special software, teachers are able to communicate both with classroom and distance students simultaneously. This provides flexibility to access graduate level courses in environmental science from anywhere in the world.

    Still, we aim to unify the students as one group. To achieve that, all students are invited to a joint activity in a mountain area nearby the university for one week. There, they are performing different field measurements, which help them to know each other and develop a group feeling. Group assignments are red thread throughout the program. It enhances student communication and exchange of information from different parts of the world.

    The overall aim of the master programme is to “lift” the students 10.000 meter up above ground. From that height they can see forests, water systems, cities and societies and not individual trees, streams, buildings or people. Only then they can understand how environmental issues are related and could be analyzed. This is achieved by introducing a variety of advanced system modelling tools, policy instruments, impact strategies, and communication skills. After graduation, the students are able to assist policy makers to resolve a variety of integrated environmental issues with ecological, social, cultural and economic perspectives.

  • 6.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Large variations in specific final energy use in Swedish apartment buildings: Causes and solutions2012Inngår i: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 49, s. 276-285Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study examines possible causes for variations in specific final energy use in new apartment buildings. The analysis is based on case studies of 22 new apartment buildings that were constructed as part of the ’Stockholm program for environmentally adapted buildings’. The buildings in the study were chosen because they share similar construction characteristics and similar energy systems but display unexpected large variations in specific energy use. Three causes were found to contribute to variations in monitored specific final energy use in the studied apartment buildings: (1) the time interval between the completion of construction work and the actual energy measurements, (2) the shape factor of the building and (3) the relative size of the common area. In addition, the buildings that participated in the Stockholm program failed to achieve the requirements for the specific final energy use, to a large extent, because of expectations based on the simulated values. The simulated specific final energy use predicted by the energy simulations were on average 19% lower than the monitored values, giving the impression that the buildings would fulfill the program’s energy requirements. The reasons for the low simulated values were determined to be large uncertainties in the input data. © 2012 Elsevier B.V. All rights reserved.

  • 7.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Measurements of heat transfer coefficient of external walls with different insulation materials2014Manuskript (preprint) (Annet vitenskapelig)
  • 8.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Diagnosis of buildings' thermal performance - a quantitative method using thermography under non-steady state heat flow2015Inngår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 83, s. 320-329Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study describes a quantitative method using thermography to measure the thermal performance of complete building envelope elements that are subjected to non-steady state heat flow. The method presumes that thermal properties of external walls, like conductivity, could still be obtained by a linear regression over values of independent measurements. And therefore could be used during fluctuating indoor and outdoor thermal conditions. The method is divided into two parts. First, the convection heat transfer coefficient is measured by heat flux meters (HFM) and thermography. And then, the overall heat transfer coefficient of a complete building element is measured by thermography to include all non-uniformities.

    In this study the thermal performance of a 140 mm thick laminated timber wall was measured. The wall was subjected to the outdoor weather conditions in Östersund, Sweden during January and February. The measurement values were found to have a large disparity as expected due to the rapid change in weather conditions. But still a linear regression with low confidence interval was obtained. The thermography results from a small uniform wall segment were validated with HFM measurements and 4% difference was found, which suggest that the two methods could be equally effective. Yet, thermography has the advantage of measuring surface temperature over large area of building element. The overall heat transfer coefficient of a large wall area was found to be 11% higher in comparison to the HFM measurements. This indicates that thermography could provide a more representative result as it captures areas of imperfections, point and linear thermal bridges.

  • 9.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    In situ measurements of thermal properties of building fabrics using thermography under non-steady state heat flow conditions2018Inngår i: Infrastructures, ISSN 2412-3811, Vol. 3, nr 3, artikkel-id 20Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study describes a quantitative method using thermography to measure the thermal properties of building fabrics that are subjected to non-steady state heat flow due to consistently changing meteorological conditions. The method includes two parts. First, the convection heat transfer coefficient is measured by thermography and heat flux meters on a small segment of the examined building fabric with uniform surface temperature. Then, thermal properties of large building fabrics are evaluated by thermography. The two parts are measured simultaneously. The method was tested on 140/160/190 mm thick massive laminated spruce timber walls of a test facility cabin located in Östersund, Sweden. The results varied by only a few percent in comparison to validation measurements performed with heat flux meters and in comparison, to values from the literature. Due to rapid changes in weather conditions the measured values had large disparity, but still a linear regression with low confidence interval was obtained. Obtaining an accurate value of convection heat transfer was important for achieving high measurement accuracy and, therefore, the value of this parameter should be measured. Other important factors to consider are solar radiation, reflected infrared (IR) radiation from nearby objects and the number of thermal images.

  • 10.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Systems effecting systems when managing energy resources2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Managing natural resources to minimize impacts driving global change requires system understanding. The ecological systems are affected by different human interventions e.g. through the use of natural resources and generation of emissions. The ‘ecological footprint’ of a provided service can differ significantly according to both the choice of technology as well as the interactions of a specific technology option within the overall technical systems. Such interactions within the technical system may have significant impact on the modeling results regarding ecological consequences for a specific technical option. These interactions are important to understand for good decision support and policy making in the context of global change. This will be illustrated by the case of using air-to-air heat pumps for space heating in Sweden.

    In recent years, air-to-air heat pumps have been the most sold technology for space heating in residential buildings in Sweden. Newly produced air-to-air heat pumps can provide heat energy from outdoor air at temperature as low as -20°C. A drawback of air-to-air heat pumps is their reduction in efficiency as the outdoor air become colder. In this study, the use of air-to air heat pumps is compared with other commercial technologies integrated in the Swedish and European energy system.

    Results show that although air-to-air heat pumps are presently very cost effective for the end user and give relatively low final energy demand for space heating by comparison to other commercial technologies, seen integrated in the Swedish and European energy system, air-to-air heat pump are inferior regarding the use of resources and securing peak load power demand. Thus, by modeling the performance of air-to-air heat pumps first by including only its interaction with the building and than by  including its interaction with the larger energy system suggest that there is presently a micro economic driver for the local investor pointing in the opposite direction regarding management of natural energy resources compared to what would be desirable in the context of global change.

  • 11.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Joelsson, Anna
    SWECO, Vastra Norrlandsgatan 10 B, Umea, SE 901 03, Sweden.
    Air source heat pumps and their role in the Swedish energy system2012Inngår i: Support your future today; Turning environmental problems into business opportunities / [ed] Leo Baas, Olof Hjelm, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Newly produced air source heat pumps can provide heat energy from outdoor air at temperature as low as -20°C. As a result they could be utilized during most days of the year even in the cold Nordic climates. The drawback of air source heat pumps is the reduction in efficiency as the outdoor air become colder, resulting in lower heat supply in times when it is most needed. Despite its inverse relationship between efficiency and outdoor temperature, air source heat pumps were installed in 57000 detached houses in Sweden during 2010 alone, which is 3% of the total detached houses stock. That makes air source heat pumps the most sold heating technology for detached houses in Sweden during 2010, 1.6 times more than the number of installations of ground source heat pump and 3 times more than the number of connections of detached houses to district heating during the same year. Similar trends can be found in other Nordic countries.This study compares the use of an air source heat pump with other existing commercial technologies in detached houses and analyzes the impacts on primary energy use, on final energy use, on electricity production and on costs benefits for house owners. It was found that converting existing electric heated Swedish detaches houses to district heating with biomass based CHP or bed-rock heat pump could reduce the use of resources, which could benefit Sweden as a society. Converting electric heated Swedish detaches houses to district heating or pellets stove could reduce power demand and level out the power demand load curve. That would benefit utilities of power supply as it could secure power supply. However cost effectiveness in one of most important drivers for house owners of detached houses to choose energy efficiency measures. For that reason house owners may most likely benefit by the installation of air-source heat pumps.

  • 12.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Joelsson, Anna
    SWECO, Vastra Norrlandsgatan 10 B, Umea, SE 901 03, Sweden.
    The impact of the shape factor on final energy demand in residential buildings in nordic climates2012Inngår i: World Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference, 2012, s. 4260-4264Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The shape factor of a building is the ratio between its envelope area and its volume. Buildings with a higher shape factor have a larger surface area in proportion to their volume, which results in larger heat losses in cold climates. This study analyzes the impact of the shape factor on the final energy demand by using five existing apartment buildings with different values of shape factor. Each building was simulated for twelve different scenarios: three thermal envelope scenarios and four climate zones. The differences in shape factor between the buildings were found to have a large impact and accounted for 10%-20% of their final energy demand. The impact of the shape factor was reduced with warmer climates and ceased with average outdoor temperature 11ºC-14ºC depending on the thermal envelope performance of the buildings.

  • 13.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Krook, Malin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Weimer, Kerstin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Atrium in residential buildings – a design to enhance social interaction in urban areas in Nordic climates2018Inngår i: Cold Climate HVAC 2018: Sustainable Buildings in Cold Climates / [ed] Dennis Johansson, Hans Bagge, Åsa Wahlström, Cham: Springer, 2018, s. 773-789Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    The design concept of conditioned atria receive growing popularity in  both commercial and service buildings all over the world, but still not common in the residential sector. This study used a psychological framework to examine if building design with enclosed heated atria in apartment buildings can enhance sense of community and social interactions in Nordic climates. A qualitative study was conducted to understand the perception of residents living in apartment buildings with heated atrium. One of the few examples in Sweden. This was compared to the experience of residents in a “traditional” apartment building without an atrium. The questionnaire was comprised of six parts: (i) socio-demographic aspects; (ii) information about the apartment; (iii) social activities within the building; (iv) social interaction with neighbours; (v) information about principles in life; and (vi) sense of community linked to their homes.

    The results showed significant social differences between the residents of the atrium and “traditional” buildings, which could not be explained solely by differences in preferences and principles in life. A large proportion of the social differences between the buildings could be explained by the building design, as the common and semi-private areas within the atrium building provide opportunities to establish social interactions. The residents in the atrium building was found to have greater sense of community and higher frequency of interactions, which are both parts of social sustainability.

  • 14.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Nair, Gireesh
    Applied Physics and Electronics, Umeå university.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Heated atrium in multi-story buildings: A design for better energy efficiency and social interactions2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The shape factor of a building expresses the ratio between the building’s thermal envelope area and its volume, or alternatively to its useful floor area. Buildings with lower shape factors will have lower heat losses through the thermal envelope and lower specific final energy demand. The shape factor of building could be reduced by a compact building shape design, and by increasing the volume of the building. However, the requirement for indoor natural light put a limit on the size of the building and therefore may limit the value of the shape factor. One possible solution to address this aspect is designing building with a heated atrium.An atrium is a large enclosed space within a building, and may have a glazed roof. In a multi-story apartment building an atrium has the potential to increase the social interaction between the residents and, with the right design, at the same time reduce the heating demand of the building due to lower building shape factor. However, the use of atrium in residential buildings in Nordic countries has not yet gained popularity.In this paper the impact of the heated atrium building with cylindrical shape design on the specific final energy is investigated by comparing such building design to conventional design buildings with similar floor area. The Nydalahuset project, in city Umeå in the north of Sweden, which is a multi-story residential building with a heated atrium, is used as a case study to investigate the affect of the atrium on the social interaction among the building occupants.The results show that heated atrium building with cylindrical shape design is a better energy efficient design than the conventional buildings. Such buildings in cold climate could help to reduce the heat losses through the thermal envelope and facilitate to achieve the passive house criteria. Moreover, the Nydalahuset project suggests that the atrium design could improve the social interaction of occupants in residential buildings.

  • 15.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Nair, Gireesh
    Umeå University, Department of Applied Physics and Electronics, Sweden .
    Joelsson, Anna
    SWECO AB (publ), Umeå, Sweden.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Heated atrium in multi-storey apartment buildings, a design with potential to enhance energy efficiency and to facilitate social interactions2016Inngår i: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 106, s. 352-364Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The design concept of conditioned atria gains increasing popularity in commercial and service buildings all over the world, but is still not a common building design in the residential sector. This study investigates the potential of such design in residential buildings in Nordic climates as means to enhance both energy efficiency as well as social interaction among residents. Energy modelling was used to compare energy efficiency among designs of residential buildings with and without atrium and to identify important design parameters. Social interaction was analysed, based on a survey evaluating the perception of residents living in an existing multi-storey apartment building designed with a heated atrium in the north of Sweden.

    The results show that heated atrium in Nordic climates have a potential to reduce the total final energy demand while at the same time increase the conditioned space of the building. To positively impact energy efficiency, the atrium should fulfil three requirements: (i) it should be designed to reduce the shape factor for the whole building; (ii) it should have the minimum glazed area that comply with the building requirements concerning natural light and visual comfort; and (iii) adjustable solar shading should be installed in the atrium’s façades to avoid unwanted overheating. The survey results indicate that the additional space created by the atrium has a potential to facilitate and promote social interaction among residents and to increases a sense of neighbourliness and belongingness, which are often discussed as important parameters in relation to social sustainability.

  • 16.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Svensson, Michelle
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Adaption of the passive house concept in northern Sweden: a case study of performance2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This study analyzes the performance of a case study of low energy house built in Östersund (lat.63°N), Sweden. The building is a semi detached house for two families, with each apartment having afloor space of 160 m2 divided on two floors. The building was constructed during 2010 according tothe Swedish passive house principles with design that meet the requirements for Swedish passivehouses as defined by the Forum for energy efficiency buildings (FEBY) and the Swedish center forzero energy houses (SCNH). The house is connected to the district heating network, which is the mainheat source for domestic water heating, floor heating in the bathroom and water based pre‐heatercoil in the ventilation system. Additionally, a wood stove is installed in the living room for thermalcomfort and convenience of the residents. The two identical residential units in the building wereinhabited in the end of 2010 by families with different characteristics; a family with two youngchildren in one unit and a middle aged couple in the other.A one year energy measurement campaign started in May 2012 for both of the residential units. Themeasurements started after a period of adjustments of the building energy system and include spaceand domestic water heating (separate measurements), household electricity, the amount of fuelwood used in the stove, and indoor thermal conditions. The results show that it is possible to buildpassive houses in the Northern regions of Sweden. The specific final energy demand of the casestudy was 23% lower than the Swedish FEBY‐requirements. Differences were found between themonitored and calculated specific final energy demand. These differences depend to a large extanton the occupants’ behavior and household characteristics. The final energy demand for heating anddomestic water heating found to vary significantly between the two households.

  • 17.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Weimer, Kerstin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Krook, Malin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Atria: en design för hållbara bostäder i ett nordiskt klimat2017Inngår i: Hållbarhetens många ansikten: samtal, forskning och fantasier / [ed] Edith Andresen, Gustav Lidén, Sara Nyhlén, Sundsvall: Mid Sweden University , 2017, s. 47-54Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 18.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Weimer, Kerstin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Krook, Malin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för psykologi.
    Atrium in residential buildings – a design to enhance social sustainability in urban areas2017Inngår i: Valuing and Evaluating Creativity for Sustainable Regional Development: Design, sustainability and its impact on social community and cultural/creative development / [ed] Daniel Laven, Wilhelm Skoglund, Östersund: Mid Sweden University , 2017, s. 153-155Konferansepaper (Fagfellevurdert)
  • 19.
    Gustavsson, Leif
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Dodoo, Ambrose
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Truong, Nguyen Le
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Primary energy implications of end-use energy efficiency measures in district heated buildings2011Inngår i: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 43, nr 1, s. 38-48Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study we explore the effects of end-use energy efficiency measures on different district heat production systems with combined heat and power (CHP) plants for base load production and heat-only boilers for peak and medium load productions. We model four minimum cost district heat production systems based on four environmental taxation scenarios, plus a reference district heat system used in Östersund, Sweden. We analyze the primary energy use and the cost of district heat production for each system. We then analyze the primary energy implications of end-use energy efficiency measures applied to a case-study apartment building, taking into account the reduced district heat demand, reduced cogenerated electricity and increased electricity use due to ventilation heat recovery. We find that district heat production cost in optimally-designed production systems is not sensitive to environmental taxation. The primary energy savings of end-use energy efficiency measures depend on the characteristics of the district heat production system and the type of end-use energy efficiency measures. Energy efficiency measures that reduce more of peak load than base load production give higher primary energy savings, because the primary energy efficiency is higher for CHP plants than for boilers. This study shows the importance of analyzing both the demand and supply sides as well as their interaction in order to minimize the primary energy use of district heated buildings.

  • 20.
    Jonasson, Jonas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Mikaelsson, Lars Åke
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Approach For Sustainable Processes For The Built Environment In Triple Helix Cooperation: The Case Of Storsjö Strand In Östersund2014Inngår i: proceedings of: Linnaeus ECO-TECH 2014, Kalmar, Sweden, November 24-26, 2014, 2014Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The built environment is an important component for a sustainable society. Choices made today will affect society during decades to come, both regarding performance of buildings and in affecting what is possible choices regarding mobility, energy, waste handling and human well being in general. There have been several projects in Sweden and around the world aiming at better sustainability performance of new built areas. A strong experience from earlier projects is that it is not that easy to actually achieve high ambitions set up at project initiation; the most common example in this direction that requirements on energy efficiency are not achieved when measuring in actual use of the final building.The project Storsjö Strand, a new township in Östersund in an earlier industrialized area, has aimed to work around identified earlier problems, using a strong interactivity and a triple helix process with the municipality, developers, and the university. The role of the university is to through an action research approach both be involved in the process to help guide it and to document and evaluate the process, with the research goal to contribute to and develop sustainable building processes for Sweden and elsewhere.The Storsjö Strand project is presently an ongoing project. This paper describes the approach taken and how it is a development of earlier approaches for sustainable building processes and also evaluates early experiences of the triple helix process.

  • 21.
    Jonasson, Jonas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Mikaelsson, Lars-Åke
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Plannig To Build Sustainable? -The Case Of Storsjö Strand2016Inngår i: Proceedings of: Linnaeus ECO-TECH 2016, 2016Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The municipality of Östersund is presently developing a new township called Storsjö Strand close to the town centre by the lakefront of the lake Storsjön. The ambition is that the new area should be a good example of more sustainable building engineering and societal planning. Mid Sweden University was engaged to follow the process in action research setting, and to enhance the learning process. A triple helix process intending to better achieve such outcomes was presented at the Eco-tech 2014 conference. The process has now moved to a stage where the first two buildings are erected.

    This paper reports on present status with a focus on how the sustainability goals have been transferred through the chain of involved organizations and individuals, developers and contractors, but also how the goals affect the production of the building, regarding materials, methods and costs, based on interviews . We have observed connections between sustainability outcomes, and the combination of quality of the goals set for the project and the types of processes for achieving them. So far, it seems like the sustainability goals partly have been transferred through the process. The process will be followed until the buildings has been in use for some time

  • 22.
    Jonasson, Jonas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Svensson, Michelle
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    A two family house built to passive house standard in the north of Sweden – environmental system performance2014Inngår i: Proceedings of: Linnaeus ECO-TECH 2014, Kalmar, Sweden, November 24-26, 2014, 2014Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    A life cycle assessment (LCA) of a low energy / passive house in northern Sweden, including building materials and energy use is reported. The case study building is semi detached house for two families situated in Östersund (lat. 63°N), Sweden. Each apartment having a floor space of 160 m2 divided on two floors. The building was constructed during 2010 with a design meeting the requirements for Swedish passive houses as defined by the Forum for energy efficiency buildings (FEBY) and the Swedish center for zero energy houses (SCNH).When it comes to more sustainable buildings, energy use in the build environment has been in focus for some time. The life cycle assessment in this study reveals that the building materials can contribute significantly to environmental burdens of a residential building in northern Sweden. Energy efficiency, efficient use of good building materials and issues of appropriate design need to be discussed in the same context to move toward a more sustainable built environment.For energy efficient buildings in a energy system with renewably based energy carriers, building materials might give rise to a significant or even dominating part of the life cycle impact of a building. This give rise to considerations regarding choices of building materials as well as design of buildings to minimize such impact; while not forgetting social aspects impacted by building design.

  • 23.
    Jonasson, Jonas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Svensson, Michelle
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Life cycle assessment of a passive house in northern Sweden2014Inngår i: Proceedings of the 20th International Sustainable Development Research Conference Trondheim 18-20 June 2014: Resilience – the new research frontier, Trondheim: Norwegian University of Science and Technology, Department of Product Design , 2014Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    When it comes to more sustainable buildings, energy use in the build environment has been in focus for some time. The life cycle assessment in this study reveals that the building materials can contribute significantly to environmental burdens of a residential building in northern Sweden. Energy efficiency, efficient use of good building materials and issues of appropriate design need to be discussed in the same context to move toward a more sustainable built environment.

    A life cycle assessment of a passive house in northern Sweden, including building materials and energy use is reported. This case study is used as base for a discussion of what can constituent resilience in the built environment.

    For energy efficient buildings in a energy system with renewably based energy carriers, building materials might give rise to a significant or even dominating part of the life cycle impact of a building. This give rise to considerations regarding choices of building materials as well as design of buildings to minimize such impacts while not forgetting social aspects impacted by building design. “Resilience” in the housing sector needs to be discussed and defined in a context taking into account LCA impacts of building materials, energy efficiency, design issues and social issues at the same time.

  • 24.
    Mikaelsson, Lars-Åke
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Carlman, Inga
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Jonsson, Anders
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Danielski, Itai
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Grönlund, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Jonasson, Jonas
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    van den Brink, Paul
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Nilsson, Nils
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande.
    Hållbara utvecklingsprocesser. Projektrapport 2015-03-312015Rapport (Annet vitenskapelig)
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