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  • 1.
    Boussaa, Youcef
    et al.
    Department of Built Environment and Energy Technology, Linnaeus University, Växjö, Sweden.
    Dodoo, Ambrose
    Department of Building Technology, Linnaeus University, Växjö, Sweden.
    Nguyen, Truong
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Rupar-Gadd, Katarina
    Department of Built Environment and Energy Technology, Linnaeus University, Växjö, Sweden.
    Comprehensive renovation of a multi-apartment building in Sweden: techno-economic analysis with respect to different economic scenarios2023Inngår i: Building Research & Information, ISSN 0961-3218, E-ISSN 1466-4321Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A wider deployment of nearly zero energy buildings (NZEBs) is expected to contribute to the transition to a decarbonized and energy-efficient building sector in Europe. This study proposed an integrated energy-economic analysis to exemplify the feasibility of NZEB renovation in temperate climate. A parametric analysis was performed to identify technical building system configurations that give minimum share of renewable energy systems contributing to NZEB level. Final energy savings, global costs and cost-effectiveness of renovating a building to NZEB level are analysed, considering active and passive energy efficiency measures (EEMs). The active EEMs included efficient water taps and heat recovery ventilation, and the passive EEMs encompassed insulations to roof, exterior walls and ground floor, and improvements of windows and doors. The building had initial final energy use of 133 kWh/m2 year for space heating, domestic hot water production (DHW) and facility electricity. The results show that NZEB level is achieved with active and passive EEMs, without renewable energy systems for scenarios with low discount rates and high future energy price escalations. The annual final energy use for space heating, DHW and facility electricity is reduced cost-effectively by 37-54%. Furthermore, increasing size of PV-system enhanced cost-effectiveness by lowering total global costs.

    Fulltekst (pdf)
    fulltext
  • 2.
    Boussaa, Youcef
    et al.
    Department of Built Environment and Energy Technology, Linnaeus University, Växjö, Sweden.
    Dodoo, Ambrose
    Department of Building Technology, Linnaeus University, Växjö, Sweden.
    Truong, Nguyen Le
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Rupar-Gadd, Katarina
    Department of Built Environment and Energy Technology, Linnaeus University, Växjö, Sweden.
    Integrating passive energy efficient measures to the building envelope of a multi-apartment building in Sweden: analysis of final energy savings and cost effectiveness2023Inngår i: Buildings, E-ISSN 2075-5309, Vol. 13, nr 10, artikkel-id 2654Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A major challenge in building energy renovation is to cost effectively achieve notable energy savings. This paper investigates cost-effective passive energy-efficiency measures for thermal envelope retrofit of a typical Swedish multi-apartment building from the 1970s. Here, the use of different types of insulation materials for the retrofits of roof, exterior walls, and ground floor are analyzed along with changing windows and doors with varying thermal transmittance values. The cost-effectiveness analysis is based on the net present value of the investment costs of the energy-efficiently measures and the achieved energy cost saving. Different economic scenarios and renovation cases are considered in techno-economic analyses to determine the cost-effective energy-efficiency retrofit measures. The results indicate that improved windows reduce energy demand for space heating by up to 23% and yield the highest final energy savings. However, additional mineral wool roof insulation is the most cost-effective measure under all economic scenarios. This measure gave the lowest ratio of cost effectiveness of about 0.1, which was obtained under the stable scenario. The final energy savings that can be achieved in a cost-effective manner vary between 28% and 61%, depending on the economic scenario and renovation case. This analysis emphasizes the influence of different renovation cases and economic parameters on the cost effectiveness of passive energy-efficiency measures.

    Fulltekst (pdf)
    fulltext
  • 3.
    Fogelström, Frej
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Danielski, Itai
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Truong, Nguyen Le
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Nair, Gireesh
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    A review of possibilities and challenges of pit thermal energy storages in Swedish district heating networks2024Inngår i: ISEC 2024: 3rd International Sustainable Energy Conference, AEE – Institute for Sustainable Technologies , 2024Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The use of pit thermal energy storages (PTES) enables higher solar fraction in district heating networks by counteracting the mismatch between heat demand and production in solar district heating (SDH) installations. Capital costs linked to land areas with site-specific geological conditions are the deciding factors for PTES constructions. This study investigates non-technical and technical factors for the implementation of PTES in Swedish district heating networks. Having several SDH and PTES installations in operation the country of Denmark is used as a reference. This study, based on literature review, discusses the drivers and challenges for the use of PTES in district heating networks.

    Fulltekst (pdf)
    fulltext
  • 4.
    Truong, Nguyen Le
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Climate effects of post-use wood materials from the building sector in a system perspective2023Inngår i: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 170, s. 317-328Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study investigates the climate change effects in terms of greenhouse gas emissions and radiative forcing resulting from different pathways of processing wood materials when they reach the end-of-life stage. The shares of combustion, landfill, recycling, and reuse, which vary with the pathways of post-use wood, influence the material and energy production systems. The dynamics of CO2 and CH4 emissions, together with the cumulative radiative forcing of each pathway, are evaluated from various regional system perspectives. The results show that the choice of a treatment pathway for post-use wood could strongly influence the profile of greenhouse gas emissions and, consequently, the global warming potential. Taking into account the situation of the reference material and energy production systems, the post-use wood can have unfavorable consequences for the climate, as in the case when the material and energy production systems are based on the low-carbon energy of natural gas. However, from the perspective where the treatment of post-use wood influences the quantity of forest biomass on the forest floor, the increased share of reuse and recycling contributes positively to the climate change mitigation, but only during the early stage. Under such a context, options relying on carbon capture and storage to handle biogenic CO2 emissions at energy conversion facilities could cause a cooling effect on the Earth's atmosphere.

    Fulltekst (pdf)
    fulltext
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