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Lina La Fleur. Energy renovation of multi-family buildings in Sweden : An evaluation of life cycle costs, indoor environment and primary energy use, and a comparison with constructing a new building. Electronic properties of complex interfaces and nanostructures 2019, 1 .
AMA StyleLina La Fleur. Energy renovation of multi-family buildings in Sweden : An evaluation of life cycle costs, indoor environment and primary energy use, and a comparison with constructing a new building. Electronic properties of complex interfaces and nanostructures. 2019; ():1.
Chicago/Turabian StyleLina La Fleur. 2019. "Energy renovation of multi-family buildings in Sweden : An evaluation of life cycle costs, indoor environment and primary energy use, and a comparison with constructing a new building." Electronic properties of complex interfaces and nanostructures , no. : 1.
A significant reduction in energy use in the building stock is a major challenge for the future, and doing this in a cost-effective manner is important. This study uses an optimization approach to identify life cycle cost (LCC) optimal energy efficiency measures (EEMs) to implement as part of a renovation of a multifamily building in Sweden. The studied building is a multifamily building with a lightweight concrete construction and an exhaust air ventilation system, built in 1961. The optimization tool OPERA-MILP is used. The energy renovation approaches are compared to both the performed energy renovation of the building and a validated dynamic energy simulation model in IDA ICE 4.8. The results show that under the given framework conditions and assumptions it is not cost-optimal to improve the thermal performance of the building envelope or to implement a balanced mechanical ventilation measures to reduce the space heating demand in the building when considering a life cycle of 40 years. Balanced mechanical ventilation system with heat recovery is cost-effective when an energy saving target of 40% is introduced. The energy renovation of the building has a slightly higher LCC than the cost-optimal level, and it would have been more cost-effective to add more insulation to the façade instead of the attic to achieve the same level of energy saving. A sensitivity analysis has been performed to reveal the effect of the discount rate, energy price, cost of EEMs, thermal properties of the building envelope and windows’ solar heat gain factors on the LCC.
Lina La Fleur; Patrik Rohdin; Bahram Moshfegh. Investigating cost-optimal energy renovation of a multifamily building in Sweden. Energy and Buildings 2019, 203, 109438 .
AMA StyleLina La Fleur, Patrik Rohdin, Bahram Moshfegh. Investigating cost-optimal energy renovation of a multifamily building in Sweden. Energy and Buildings. 2019; 203 ():109438.
Chicago/Turabian StyleLina La Fleur; Patrik Rohdin; Bahram Moshfegh. 2019. "Investigating cost-optimal energy renovation of a multifamily building in Sweden." Energy and Buildings 203, no. : 109438.
This study addresses the life cycle costs (LCC) of energy renovation, and the demolition and construction of a new building. A comparison is made between LCC optimal energy renovations of four different building types with thermal performance, representing Swedish constructions from the 1940s, 1950s, 1960s, and 1970s, as well as the demolition of the building and construction of a new building that complies with the Swedish building code. A Swedish multi-family building from the 1960s is used as a reference building. LCC optimal energy renovations are identified with energy saving targets ranging between 10% and 70%, in addition to the lowest possible life cycle cost. The analyses show that an ambitious energy renovation is not cost-optimal in any of the studied buildings, if achieving the lowest LCC is the objective function. The cost of the demolition and construction of a new building is higher compared to energy renovation to the same energy performance. The higher rent in new buildings does not compensate for the higher cost of new construction. A more ambitious renovation is required in buildings that have a shape factor with a high internal volume to heated floor area ratio.
Lina La Fleur; Patrik Rohdin; Bahram Moshfegh. Energy Renovation versus Demolition and Construction of a New Building—A Comparative Analysis of a Swedish Multi-Family Building. Energies 2019, 12, 2218 .
AMA StyleLina La Fleur, Patrik Rohdin, Bahram Moshfegh. Energy Renovation versus Demolition and Construction of a New Building—A Comparative Analysis of a Swedish Multi-Family Building. Energies. 2019; 12 (11):2218.
Chicago/Turabian StyleLina La Fleur; Patrik Rohdin; Bahram Moshfegh. 2019. "Energy Renovation versus Demolition and Construction of a New Building—A Comparative Analysis of a Swedish Multi-Family Building." Energies 12, no. 11: 2218.
In Sweden, 90% of multifamily buildings utilize district heat and a large portion is in need of renovation. The aim is to analyze the impact of renovating a multifamily building stock in a district heating and cooling system, in terms of primary energy savings, peak power demands, electricity demand and production, and greenhouse gas emissions on local and global levels. The study analyzes scenarios regarding measures on the building envelope, ventilation, and substitution from district heat to ground source heat pump. The results indicate improved energy performance for all scenarios, ranging from 11% to 56%. Moreover, the scenarios present a reduction of fossil fuel use and reduced peak power demand in the district heating and cooling system ranging from 1 MW to 13 MW, corresponding to 4–48 W/m2 heated building area. However, the study concludes that scenarios including a ground source heat pump generate significantly higher global greenhouse gas emissions relative to scenarios including district heating. Furthermore, in a future fossil-free district heating and cooling system, a reduction in primary energy use will lead to a local reduction of emissions along with a positive effect on global greenhouse gas emissions, outperforming measures with a ground source heat pump.
Stefan Blomqvist; Lina La Fleur; Shahnaz Amiri; Patrik Rohdin; Louise Ödlund (Former Trygg). The Impact on System Performance When Renovating a Multifamily Building Stock in a District Heated Region. Sustainability 2019, 11, 2199 .
AMA StyleStefan Blomqvist, Lina La Fleur, Shahnaz Amiri, Patrik Rohdin, Louise Ödlund (Former Trygg). The Impact on System Performance When Renovating a Multifamily Building Stock in a District Heated Region. Sustainability. 2019; 11 (8):2199.
Chicago/Turabian StyleStefan Blomqvist; Lina La Fleur; Shahnaz Amiri; Patrik Rohdin; Louise Ödlund (Former Trygg). 2019. "The Impact on System Performance When Renovating a Multifamily Building Stock in a District Heated Region." Sustainability 11, no. 8: 2199.
Improved energy efficiency in the building sector is a central goal in the European Union and renovation of buildings can significantly improve both energy efficiency and indoor environment. This paper studies the perception of indoor environment, modelled indoor climate and heat demand in a building before and after major renovation. The building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with indoor environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high indoor temperatures, and higher indoor temperature might increase thermal comfort during heating season but significantly increases energy use.
Lina La Fleur; Patrik Rohdin; Bahram Moshfegh. Energy Use and Perceived Indoor Environment in a Swedish Multifamily Building before and after Major Renovation. Sustainability 2018, 10, 766 .
AMA StyleLina La Fleur, Patrik Rohdin, Bahram Moshfegh. Energy Use and Perceived Indoor Environment in a Swedish Multifamily Building before and after Major Renovation. Sustainability. 2018; 10 (3):766.
Chicago/Turabian StyleLina La Fleur; Patrik Rohdin; Bahram Moshfegh. 2018. "Energy Use and Perceived Indoor Environment in a Swedish Multifamily Building before and after Major Renovation." Sustainability 10, no. 3: 766.
Lina La Fleur; Bahram Moshfegh; Patrik Rohdin. Measured and predicted energy use and indoor climate before and after a major renovation of an apartment building in Sweden. Energy and Buildings 2017, 146, 98 -110.
AMA StyleLina La Fleur, Bahram Moshfegh, Patrik Rohdin. Measured and predicted energy use and indoor climate before and after a major renovation of an apartment building in Sweden. Energy and Buildings. 2017; 146 ():98-110.
Chicago/Turabian StyleLina La Fleur; Bahram Moshfegh; Patrik Rohdin. 2017. "Measured and predicted energy use and indoor climate before and after a major renovation of an apartment building in Sweden." Energy and Buildings 146, no. : 98-110.
Increased attention is being directed towards reducing energy use in buildings, and implementing energy-saving measures when renovating buildings has become of central importance. The aim of this chapter is to study the effects on heat demand of a deep renovation of a Swedish post-war, multi-family building. The studied building was renovated in 2014, and the renovation measures included thermal improvement of the climate envelope and installation of a mechanical supply and exhaust air ventilation system with heat recovery. The effect on heat demand is studied through a whole-building energy simulation, using IDA Indoor Climate and Energy. The IDA model is empirically validated with regard to its ability to predict indoor temperature and energy use. The results indicate a technical potential for a 50.3 % reduction of heat demand from implemented renovation measures, but measured data indicate that actual energy use is around 15 % higher than the technical potential. The reasons for this gap could be overestimated heat recovery efficiency or airing.
Lina La Fleur; Bahram Moshfegh; Patrik Rohdin. Energy Performance of a Renovated Multi-Family Building in Sweden. Mediterranean Green Buildings & Renewable Energy 2016, 531 -539.
AMA StyleLina La Fleur, Bahram Moshfegh, Patrik Rohdin. Energy Performance of a Renovated Multi-Family Building in Sweden. Mediterranean Green Buildings & Renewable Energy. 2016; ():531-539.
Chicago/Turabian StyleLina La Fleur; Bahram Moshfegh; Patrik Rohdin. 2016. "Energy Performance of a Renovated Multi-Family Building in Sweden." Mediterranean Green Buildings & Renewable Energy , no. : 531-539.