| 1. |
- Pardalis, Georgios, 1983-, et al.
(författare)
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Kundresa för One-Stop-Shop
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Den här guiden är en av tre guider som publiceras inom detta projektoch bygger på tidigare forskning, med syftet att utveckla kunskap och metoder för aktörer på efterfråge- och utbudssidan på marknaden för energieffektiv renovering av villor. Guiden ger en översikt över den kundresa som villaägare följer i sitt beslut att genomföra eller inte att energirenovera sin villa, och hur One-stop-shop (OSS) konceptet kan bidra med renoveringsresan.
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| 2. |
- Rupar-Gadd, Katarina, 1974-, et al.
(författare)
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Evaluation of increased electricity production when cooling solar panels
- 2022
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Ingår i: SBE22Delft - Innovations for the Urban Energy Transition. - Bristol, United Kingdom : Institute of Physics (IOP).
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Konferensbidrag (refereegranskat)abstract
- A municipal housing company located in the south of Sweden has energy renovatedseveral buildings with a total of 380 apartments to meet today’s energy standards. Several energyefficient technologies and solutions were implemented and the energy consumption for thesebuildings were lowered by 50%. One of the buildings functions as a demonstration building forinnovative solutions such as low temperature district heating, waste water heat recovery, andsolar photovoltaic and thermal (PVT) panels. The solar PVT panels are cooled down with themain purpose to increase the electricity production. The cooling medium for these panels iscirculated through two bedrock boreholes to dissipate the collected heat. The heat from theboreholes is then used for an electric heat pump to produce heat to send to the local districtheating company. The electricity produced is primarily used in the building. The objective ofthis paper is to assess the electricity production from real-life outdoor Photovoltaic-thermal(PVT) plant. The plant was installed on the roof top of an energy renovated multi-familyapartment building located in the south of Sweden. The cooling of the panels were turned on andoff to assess if the electricity production would increase or not. The electricity production didnot increase when the cooling was applied. The temperature measuring equipment which wasinstalled at the wrong position and was supposed to measure the temperature at the back of thePVT is needed to compare the efficiency of the PVT plant and draw further conclusions.
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| 3. |
- Rupar-Gadd, Katarina, 1974-, et al.
(författare)
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Evaluation of smart energy solutions in a multifamily apartment building in Småland, Sweden
- 2021
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Ingår i: eceee Summer Study on Energy Efficiency. - : European Council for an Energy Efficient Economy (ECEEE). - 9789198387889 ; , s. 999-104
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Konferensbidrag (refereegranskat)abstract
- A municipal housing company in the south of Sweden constructed three energy efficient multi-family apartment buildings in 2020 in which smart technologies were implemented. One of the buildings with a total heated area of 976 m2 is designed to have a primary energy number of 19.3 kWh/ m2 /year compared to the 85 kWh/m2/year as required by the Swedish Building Regulations. Apart from building envelope energy efficiency measures solar panels were installed and the excess electricity produced is stored to a battery. The excess heat from the solar panels is used in the bedrock heating system with cooling possibilities. The aim of this energy solution is to make the buildings partially off-grid. The actual electricity produced from the solar hybrid panels is so far lower than the simulated self-consumption and the battery is not used to its full potential. The rainwater collected was enough to save 75 percent of drinking water volume normally used for toilet flushing according to calculations made from incomplete data. A faulty installed meter, a fire incident, the use of several different systems and companies for collecting and logging data, and many other contributing factors affecting the possibility to evaluate the installed smart energy systems needs to be remediated. A recommendation is to assign someone the role of energy coordinator with the purpose of making evaluation possible within one year.
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| 4. |
- Sula, Migena, 1986-, et al.
(författare)
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Adopting Space Sufficiency Interventions as a Means for Accelerating Energy Renovation : Swedish Homeowners’ Perspective
- 2023
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Ingår i: Proceedings of the International Conference “Sustainable Built Environment and Urban Transition”. - : Linnaeus University Press. - 9789180820424
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Konferensbidrag (refereegranskat)abstract
- Residential energy consumption remains a significant driver of CO2 emissions in European buildings, demanding urgent action in the face of the climate crisis. While prevailing efforts have predominantly concentrated on enhancing energy efficiency and integrating renewable sources, addressing the climate urgency and resource constraints necessitates a paradigm shift towards sufficiency principles. Swedish statistics on Single-Family Houses (SFH) show that more than a third of households inhabit oversized spaces in aging buildings needing renovation. Sufficiency-oriented renovation strategies—optimizing, or reducing living areas per capita— present a promising avenue to achieve substantial energy reductions. This approach also opens the potential for space rentals, yielding combined energy and space efficiency advantages. In addition, the literature highlights reduced maintenance costs and potential urban housing crisis mitigation. However, practical implementation faces multiple obstacles.This paper investigates SFH owners' attitudes towards space-sufficiency interventions, focusing on living size preferences and identifying barriers and opportunities for sustainable housing. Through focus group sessions with SFH owners in November-December 2022, qualitative content analysis revealed that reducing living space per capita faces multifaceted challenges, despite potential benefits.These challenges encompass not only personal and psychological considerations but extend to economic, infrastructural, and policy barriers, including issues such as the potential breach of privacy, disruptions due to noise, dilemmas related to ownership and independency, disruptions to work-life dynamics, inadequate familiarity with sufficiency principles, and uncertainty imposed by space constraints. Strategic integration of sufficiency principles into energy-renovation policy alternatives necessitates a holistic approach that addresses these barriers, and some form of incentives may be needed to catalyze the adoption of sufficiency principles effectively.
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| 5. |
- Albers, Eva, 1966, et al.
(författare)
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Influence of preservation methods on biochemical composition and downstream processing of cultivated Saccharina latissima biomass
- 2021
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Ingår i: Algal Research. - : Elsevier BV. - 2211-9264. ; 55
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Tidskriftsartikel (refereegranskat)abstract
- Saccharina latissima biomass cultivated along the Swedish west coast was subjected to four different scalable preservation methods after harvest; freezing, sun-drying, oven-drying and ensiling. Freeze-drying and freezing at -80 ?C were also included to provide dry and wet references. The effects of the different preservation methods on the composition of Saccharina biomass (on dry weight, DW, basis), and the recovery as well as properties of high-quality protein, alginate and biogas were evaluated. Sun-drying significantly reduced protein, alginate and fatty acid content of the seaweeds and thereby concentrated ash in the biomass compared to the other methods. Protein/amino acids and fatty acids were significantly concentrated in ensiled biomass, while mannitol and laminarin were reduced compared to the other biomasses. Oven-drying and -20 ?C freezing affected the composition the least, with lower ash content and alterations in some specific amino and fatty acids. Sun-drying and ensiling resulted in significantly lower protein solubility at high pH compared to the other biomasses which translated into the lowest total seaweed protein recovery using the pH-shift process. Highest protein yield was obtained with the freeze-dried reference. Ensiling lead to a significant decrease in the molecular weight of alginate, while sun-drying caused a negative effect on alginate by inducing a shift in the guluronic and mannuronic acids composition of alginate. Sun-drying gave the lowest methane yield in the anaerobic digestion experiments while freezing at -80 ?C gave the highest yield, closely followed by freezing at -20 ?C and ensiling. To conclude, preservation methods must be carefully chosen to protect the valuable component in Saccharina latissima, and to achieve an efficient downstream processing ultimately yielding high quality products as part of a seaweed biorefinery.
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| 6. |
- Boussaa, Youcef, 1993-, et al.
(författare)
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Analysis of cost-effective energy efficiency measures for thermal envelope of a multi-apartment building in Sweden
- 2020
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Ingår i: Proceedings of 12th International Conference on Applied Energy, Part 3, Sweden, 2020. - : ICAE. - 9789198673821
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Konferensbidrag (refereegranskat)abstract
- A large potential for energy savings can be found in building envelopes of the existing Swedish dwelling stock. This study analyzes the final energy savings and cost implications of energy efficiency measures for an existing multi-apartment building in Sweden. Energy efficiency improvements consisting of high-performance windows as well as doors, and additional insulation to attic floor and exterior walls were modelled to the building’s thermal envelope. Dynamic energy balance simulations were performed to determine the final energy savings of the improvements. The cost-effectiveness of the improvements were then analyzed considering the net present value of the energy cost savings and the investment costs of the improvement measures. The results showed that additional insulation to the attic floor is the only cost-effective measure for the building under the existing operating conditions. The other improvement measures give high final energy savings but are not cost effective due to their high investment costs.
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| 7. |
- Boussaa, Youcef, 1993-, et al.
(författare)
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Comprehensive renovation of a multi-apartment building in Sweden : techno-economic analysis with respect to different economic scenarios
- 2023
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Ingår i: Building Research & Information. - : Taylor & Francis Group. - 0961-3218 .- 1466-4321.
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 8. |
- Boussaa, Youcef, 1993-, et al.
(författare)
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Energy efficient measures for thermal envelope of a multi-apartment building in Sweden : Analysis of cost effectiveness with respect to carbon abatement costs implementation
- 2021
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Ingår i: eceee 2021 Summer Study on energy efficiency: a new reality?. - : European Council for an Energy Efficient Economy (ECEEE). - 9789198387889 ; , s. 1015-1024
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Konferensbidrag (refereegranskat)abstract
- A considerable share of the existing buildings in Europe has low energy performance and are expected to last at least for the next 50 years. The operation of these buildings causes high atmospheric greenhouse gases emissions, besides low thermal comfort for occupants. In Sweden, most of the existing buildings are residential, consisting of multi- and single-family houses. Large final energy savings can be achieved by integrating energy efficient measures (EEMs) to the thermal envelopes of these buildings. However, it is often a challenge to achieve a considerable energy savings and realize cost effectiveness simultaneously. This study investigates the effect of carbon taxes implementation on the cost effectiveness of EEMs applied to an existing multi-apartment building in southern Sweden. It explores the implications of different additional insulation thicknesses for exterior walls and roof, and high-performance windows and doors, for the final energy use and carbon dioxide (CO2) emissions of the building. The final energy savings of the EEMs are estimated through dynamic energy balance simulations and the CO2 emissions are calculated considering the full energy chains. The cost effectiveness of the EEMs are analyzed with and without carbon abatement costs considering the investment costs and associated net present value of costs savings of the EEMs. The results show that replacing the existing windows give the highest final energy savings, reducing the building’s space heating demand by 23 %. The cost optimal analysis without carbon abatement costs shows that all the analyzed thicknesses of roof insulation and high-performance windows are cost effective. Considering the carbon abatement costs altered the cost effectiveness of the EEMs, with exterior walls as well as ground floor insulations and door replacement becoming cost effective for certain thicknesses and U-values, respectively.
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| 9. |
- Boussaa, Youcef, 1993-, et al.
(författare)
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Integrating Passive Energy Efficient Measures to the Building Envelope of a Multi-Apartment Building in Sweden : Analysis of Final Energy Savings and Cost Effectiveness
- 2023
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Ingår i: Buildings. - : MDPI. - 2075-5309. ; 13:10
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 10. |
- Ibrahim, Muhammad Asim, 1980-, et al.
(författare)
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Mitigating the emissions released from spontaneous fires at biomass storages : A footstep towards sustainability
- 2015
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Ingår i: 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015. - 9788889407516 ; , s. 1550-1557
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Konferensbidrag (refereegranskat)abstract
- Fires at the material storages sites of manucipal and industrial sectors are a major environmental risk and have increased significantly. Toxic emissions released from such open fires have severe environmental and health consequences. Considering that it is not possible to install any unit operation to control the emissions released from such open fires, the possibilities to employ natural vegetation to act as a sink for aerosol particles released from open fires was investigated. A series of tests was conducted in a controlled wind tunnel environment. Smoke was generated in a smoke-aerosol generator and measurements of smoke concentrations upwind and downwind of “green filter packs” (vegetation filters) were made. Measurements involved laser-based particle counters, two-stage Nuclepore filter systems, and Solid Phase Microextraction (SPME) techniques followed by Gas Chromatography-Mass Spectrometry (GC-MS). The main objective of the work was to illustrate ways to design experiments that can assist in the study of vegetation as “pollution screens”. Our observations and findings imply that several refinements to the experimental design will be needed, including with respect to methods for assessing the distribution of particle number and mass as a function of particle size.
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