The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Juha Jokisalo - One of the best experts on this subject based on the ideXlab platform.
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energy performance and environmental impact analysis of cost optimal Renovation solutions of large panel apartment buildings in finland
Sustainable Cities and Society, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents energy performance and environmental impact analysis of cost-optimal Renovation solutions conducted in deep Renovations of typical large panel-structured apartment buildings located in cold climate conditions. The main objective of the study was to determine the cost-optimal Renovation concepts from both the primary energy performance and the total CO 2 emission reduction potential perspectives. The cost-optimal solutions for different main heating systems were determined from over 220 million Renovation combinations by using a simulation-based multi-objective optimization (SBMOO) analysis as the main research method. The results demonstrate that the proposed national nearly zero-energy apartment building level can be cost-effectively achieved in deep Renovations of large panel apartment buildings, delivering approximately 18–36% return on investment. The results also indicate that up to 90–98 €/m 2 net savings, 850–930 kWh/m 2 reduction in the primary energy consumption and 350–390 kg/m 2 reduction in the total CO 2 emissions over the studied 30-year life-cycle period can be achieved simultaneously, when the cost-optimal Renovation concepts are selected. Cost-optimally dimensioned heat pump systems deliver significant cost saving and environmental impact reduction potential compared to improving the energy efficiency of the building envelope, as the delivered energy consumption accounts for more than 90% of the total CO 2 emissions.
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cost effectiveness of energy performance Renovation measures in finnish brick apartment buildings
Energy and Buildings, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents cost-optimal energy performance improving measures conducted in deep Renovations of typical Finnish (cold climate) brick apartment buildings, built in the 1960’s. The study discusses the effects of different Renovation measures on the energy performance and economic viability in a selected building. Energy performance is studied from the primary energy consumption’s perspective and cost-effective Renovation measures to meet higher energy performance criteria are also studied. The cost-optimal Renovation concepts to meet different energy performance criteria were determined from over 2 billion potential Renovation measure combinations by using sophisticated simulation-based multi-objective optimisation (SBMOO) analysis, utilising the advanced Pareto-Archive NSGA-II genetic algorithm, as the main research method. The SBMOO analysis was used to minimise the primary energy consumption and the net present value of life-cycle cost over a 25-year discount period simultaneously. The results indicate that the cost optimum Renovation solutions of the brick apartment building stock provide the same energy performance criteria as the current national minimum energy performance requirements of new apartment buildings. According to the study, the investments should be focused on high performance renewable energy production systems, which deliver the best return on investment. External financial support mechanisms are also required to encourage apartment building owners to conduct deep Renovations towards nearly zero-energy apartment buildings.
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cost optimal energy performance Renovation measures of educational buildings in cold climate
Applied Energy, 2016Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper discusses cost-efficient energy performance Renovation measures for typical educational buildings built in the 1960s and 1970s in cold climate regions. The study analyzes the impact of different energy Renovation measures on the energy efficiency and economic viability in a Finnish case study educational building located in Lappeenranta University of Technology (LUT) campus area. The main objective of the study was to determine the cost-optimal energy performance Renovation measures to meet the proposed national nearly zero-energy building (nZEB) requirements, which are defined according to the primary energy consumption of buildings. The main research method of the study was simulation-based optimization (SBO) analysis, which was used to determine the cost-optimal Renovation solutions. The results of the study indicate that the minimum national energy performance requirement of new educational buildings (E primary ⩽ 170 kWh/(m 2 ,a)) can be cost-effectively achieved in deep Renovations of educational buildings. In addition, the proposed national nZEB-targets are also well achievable, while improving the indoor climate (thermal comfort and indoor air quality) conditions significantly at the same time. Cost-effective solutions included Renovation of the original ventilation system, a ground source heat pump system with relatively small dimensioning power output, new energy efficient windows and a relatively large area of PV-panels for solar-based electricity production. The results and conclusions of this study can be generalized to similar climates and techno-economic environments.
Tuomo Niemelä - One of the best experts on this subject based on the ideXlab platform.
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energy performance and environmental impact analysis of cost optimal Renovation solutions of large panel apartment buildings in finland
Sustainable Cities and Society, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents energy performance and environmental impact analysis of cost-optimal Renovation solutions conducted in deep Renovations of typical large panel-structured apartment buildings located in cold climate conditions. The main objective of the study was to determine the cost-optimal Renovation concepts from both the primary energy performance and the total CO 2 emission reduction potential perspectives. The cost-optimal solutions for different main heating systems were determined from over 220 million Renovation combinations by using a simulation-based multi-objective optimization (SBMOO) analysis as the main research method. The results demonstrate that the proposed national nearly zero-energy apartment building level can be cost-effectively achieved in deep Renovations of large panel apartment buildings, delivering approximately 18–36% return on investment. The results also indicate that up to 90–98 €/m 2 net savings, 850–930 kWh/m 2 reduction in the primary energy consumption and 350–390 kg/m 2 reduction in the total CO 2 emissions over the studied 30-year life-cycle period can be achieved simultaneously, when the cost-optimal Renovation concepts are selected. Cost-optimally dimensioned heat pump systems deliver significant cost saving and environmental impact reduction potential compared to improving the energy efficiency of the building envelope, as the delivered energy consumption accounts for more than 90% of the total CO 2 emissions.
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cost effectiveness of energy performance Renovation measures in finnish brick apartment buildings
Energy and Buildings, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents cost-optimal energy performance improving measures conducted in deep Renovations of typical Finnish (cold climate) brick apartment buildings, built in the 1960’s. The study discusses the effects of different Renovation measures on the energy performance and economic viability in a selected building. Energy performance is studied from the primary energy consumption’s perspective and cost-effective Renovation measures to meet higher energy performance criteria are also studied. The cost-optimal Renovation concepts to meet different energy performance criteria were determined from over 2 billion potential Renovation measure combinations by using sophisticated simulation-based multi-objective optimisation (SBMOO) analysis, utilising the advanced Pareto-Archive NSGA-II genetic algorithm, as the main research method. The SBMOO analysis was used to minimise the primary energy consumption and the net present value of life-cycle cost over a 25-year discount period simultaneously. The results indicate that the cost optimum Renovation solutions of the brick apartment building stock provide the same energy performance criteria as the current national minimum energy performance requirements of new apartment buildings. According to the study, the investments should be focused on high performance renewable energy production systems, which deliver the best return on investment. External financial support mechanisms are also required to encourage apartment building owners to conduct deep Renovations towards nearly zero-energy apartment buildings.
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cost optimal energy performance Renovation measures of educational buildings in cold climate
Applied Energy, 2016Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper discusses cost-efficient energy performance Renovation measures for typical educational buildings built in the 1960s and 1970s in cold climate regions. The study analyzes the impact of different energy Renovation measures on the energy efficiency and economic viability in a Finnish case study educational building located in Lappeenranta University of Technology (LUT) campus area. The main objective of the study was to determine the cost-optimal energy performance Renovation measures to meet the proposed national nearly zero-energy building (nZEB) requirements, which are defined according to the primary energy consumption of buildings. The main research method of the study was simulation-based optimization (SBO) analysis, which was used to determine the cost-optimal Renovation solutions. The results of the study indicate that the minimum national energy performance requirement of new educational buildings (E primary ⩽ 170 kWh/(m 2 ,a)) can be cost-effectively achieved in deep Renovations of educational buildings. In addition, the proposed national nZEB-targets are also well achievable, while improving the indoor climate (thermal comfort and indoor air quality) conditions significantly at the same time. Cost-effective solutions included Renovation of the original ventilation system, a ground source heat pump system with relatively small dimensioning power output, new energy efficient windows and a relatively large area of PV-panels for solar-based electricity production. The results and conclusions of this study can be generalized to similar climates and techno-economic environments.
Yikai Juan - One of the best experts on this subject based on the ideXlab platform.
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a hybrid decision support system for sustainable office building Renovation and energy performance improvement
Energy and Buildings, 2010Co-Authors: Yikai Juan, Jie WangAbstract:Abstract Energy consumption of buildings accounts for around 20–40% of all energy consumed in advanced countries. Over the last decade, more and more global organizations are investing significant resources to create sustainably built environments, emphasizing sustainable building Renovation processes to reduce energy consumption and carbon dioxide emissions. This study develops an integrated decision support system to assess existing office building conditions and to recommend an optimal set of sustainable Renovation actions, considering trade-offs between Renovation cost, improved building quality, and environmental impacts. A hybrid approach that combines A* graph search algorithm with genetic algorithms (GA) is used to analyze all possible Renovation actions and their trade-offs to develop the optimal solution. A two-stage system validation is performed to demonstrate the practical application of the hybrid approach: zero-one goal programming (ZOGP) and genetic algorithms are adopted to validate the effectiveness of the algorithm. A real-world Renovation project is introduced to validate differences in energy performance projected for the Renovation solution suggested by the system. The results reveal that the proposed hybrid system is more computationally effective than either ZOGP or GA alone. The system's suggested Renovation actions would provide substantial energy performance improvements to the real project if implemented.
Svend Svendsen - One of the best experts on this subject based on the ideXlab platform.
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full scale test of an old heritage multi storey building undergoing energy retrofitting with focus on internal insulation and moisture
Building and Environment, 2015Co-Authors: Maria Harrestrup, Svend SvendsenAbstract:Abstract The hypothesis investigated in this article is: it is possible to carry out moisture safe energy Renovations in the old existing multi-storey buildings with heritage value and still save 50% of the building's energy consumption by use of existing technologies. A holistic energy Renovation on an old multi-storey building with heritage value was carried out. Focus was given to energy-saving measures that would preserve the original architectural expression of the building, such as internal insulation. Comprehensive measurements were performed on the energy consumption before and after the Renovation to document the obtained savings. Numerical simulations were validated with the measurements in order to explain the savings and to carry out parameter variations on the energy saving measures. Since internal insulation was applied the durability and robustness were investigated and measurements of the temperature and relative humidity were performed in the wooden beams-ends embedded in the masonry brick wall. A solution where the insulation was stopped 200 mm above the floor was investigated. This increased the heat flows through the wall compared to a fully insulated wall, and calculations showed that the difference in the space heating consumption was 3 kWh/m2/yr. The measurements showed the proposed solution should have no risk of moisture problems. The measured energy consumption was reduced with 47% whereas the theoretical reduction could be reduced with 39–61% depending on the room set-point temperature (20–24 °C).
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energy savings in danish residential building stock
Energy and Buildings, 2006Co-Authors: Henrik M Tommerup, Svend SvendsenAbstract:A large potential for energy savings exists in the Danish residential building stock due to the fact that 75% of the buildings were constructed before 1979 when the first important demands for energy performance of building were introduced. It is also a fact that many buildings in Denmark face comprehensive Renovations in the coming years and in connection with this Renovation process energy-saving measures can be implemented relatively inexpensive and cost effective. This opportunity should be used to insure the buildings in the future as far as energy consumption is concerned. This paper gives a short account of the technical energy-saving possibilities that are present in existing dwellings and presents a financial methodology used for assessing energy-saving measures. In order to estimate the total savings potential detailed calculations have been performed in a case with two typical buildings representing the residential building stock and based on these calculations an assessment of the energy-saving potential is performed. A profitable savings potential of energy used for space heating of about 80% is identified over 45 years (until 2050) within the residential building stock if the energy performances are upgraded when buildings are renovated.
Risto Kosonen - One of the best experts on this subject based on the ideXlab platform.
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energy performance and environmental impact analysis of cost optimal Renovation solutions of large panel apartment buildings in finland
Sustainable Cities and Society, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents energy performance and environmental impact analysis of cost-optimal Renovation solutions conducted in deep Renovations of typical large panel-structured apartment buildings located in cold climate conditions. The main objective of the study was to determine the cost-optimal Renovation concepts from both the primary energy performance and the total CO 2 emission reduction potential perspectives. The cost-optimal solutions for different main heating systems were determined from over 220 million Renovation combinations by using a simulation-based multi-objective optimization (SBMOO) analysis as the main research method. The results demonstrate that the proposed national nearly zero-energy apartment building level can be cost-effectively achieved in deep Renovations of large panel apartment buildings, delivering approximately 18–36% return on investment. The results also indicate that up to 90–98 €/m 2 net savings, 850–930 kWh/m 2 reduction in the primary energy consumption and 350–390 kg/m 2 reduction in the total CO 2 emissions over the studied 30-year life-cycle period can be achieved simultaneously, when the cost-optimal Renovation concepts are selected. Cost-optimally dimensioned heat pump systems deliver significant cost saving and environmental impact reduction potential compared to improving the energy efficiency of the building envelope, as the delivered energy consumption accounts for more than 90% of the total CO 2 emissions.
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cost effectiveness of energy performance Renovation measures in finnish brick apartment buildings
Energy and Buildings, 2017Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper presents cost-optimal energy performance improving measures conducted in deep Renovations of typical Finnish (cold climate) brick apartment buildings, built in the 1960’s. The study discusses the effects of different Renovation measures on the energy performance and economic viability in a selected building. Energy performance is studied from the primary energy consumption’s perspective and cost-effective Renovation measures to meet higher energy performance criteria are also studied. The cost-optimal Renovation concepts to meet different energy performance criteria were determined from over 2 billion potential Renovation measure combinations by using sophisticated simulation-based multi-objective optimisation (SBMOO) analysis, utilising the advanced Pareto-Archive NSGA-II genetic algorithm, as the main research method. The SBMOO analysis was used to minimise the primary energy consumption and the net present value of life-cycle cost over a 25-year discount period simultaneously. The results indicate that the cost optimum Renovation solutions of the brick apartment building stock provide the same energy performance criteria as the current national minimum energy performance requirements of new apartment buildings. According to the study, the investments should be focused on high performance renewable energy production systems, which deliver the best return on investment. External financial support mechanisms are also required to encourage apartment building owners to conduct deep Renovations towards nearly zero-energy apartment buildings.
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cost optimal energy performance Renovation measures of educational buildings in cold climate
Applied Energy, 2016Co-Authors: Tuomo Niemelä, Risto Kosonen, Juha JokisaloAbstract:Abstract The paper discusses cost-efficient energy performance Renovation measures for typical educational buildings built in the 1960s and 1970s in cold climate regions. The study analyzes the impact of different energy Renovation measures on the energy efficiency and economic viability in a Finnish case study educational building located in Lappeenranta University of Technology (LUT) campus area. The main objective of the study was to determine the cost-optimal energy performance Renovation measures to meet the proposed national nearly zero-energy building (nZEB) requirements, which are defined according to the primary energy consumption of buildings. The main research method of the study was simulation-based optimization (SBO) analysis, which was used to determine the cost-optimal Renovation solutions. The results of the study indicate that the minimum national energy performance requirement of new educational buildings (E primary ⩽ 170 kWh/(m 2 ,a)) can be cost-effectively achieved in deep Renovations of educational buildings. In addition, the proposed national nZEB-targets are also well achievable, while improving the indoor climate (thermal comfort and indoor air quality) conditions significantly at the same time. Cost-effective solutions included Renovation of the original ventilation system, a ground source heat pump system with relatively small dimensioning power output, new energy efficient windows and a relatively large area of PV-panels for solar-based electricity production. The results and conclusions of this study can be generalized to similar climates and techno-economic environments.
