Techno-economic analysis of energy renovation measures for a district heated multi-family house

Gustafsson, Marcus; Gustafsson, Moa Swing; Zhang, Xingxing; Bales, Chris; Holmberg, Sture

doi:10.1016/j.apenergy.2016.05.104

Cited by 51 publications

(30 citation statements)

References 21 publications

(30 reference statements)

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“…Charging modern electric cars at once during a specific time of the day may induce temporary and localized power deficits [3,4]. With emerging concepts of electric houses and heat pumps, the demand is expected to increase significantly [5,6].…”

Section: Introductionmentioning

confidence: 99%

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

International Journal of Electrical Power & Energy Systems

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a b s t r a c tIt is anticipated that with the thrust towards use of clean energy resources such as electric vehicles, future distribution grids will face a steep increase in power demand, forcing the utility operators to invest in enhancing the power delivering capacity of the grid infrastructure. It is identified that the critical 5-20 km medium voltage (MV) underground ac distribution cable link, responsible for bulk power delivery to the inner urban city substation, can benefit the most with capacity and efficiency enhancement, if the existing infrastructure is reused and operated under dc. Quantification of the same is offered in this paper by incorporating all influencing factors like voltage regulation, dc voltage rating enhancement, capacitive leakage currents, skin and magnetic proximity effect, thermal proximity effect and load power factor. Results are presented for three different ac and dc system topologies for varying cable lengths and conductor cross-sections. The computed system efficiency is enhanced with use of modular multilevel converters that have lower losses due to lower switching frequency. A justified expectation of 50-60% capacity gains is proved along with a generalized insight on its variations that can be extrapolated for different network parameters and configurations. Conditions for achieving payback time of 5 years or lower due to energy savings are identified, while the socio-economic benefits of avoiding digging and installing new cable infrastructure are highlighted. The technical implications of refurbishing cables designed for ac to operate under dc conditions is discussed in terms of imposed electric fields, thermal profile and lifetime. A novel opportunity of temperature dependent dynamic dc voltage rating to achieve additional capacity and efficiency gains is presented.

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Section: Introductionmentioning

confidence: 99%

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

International Journal of Electrical Power & Energy Systems

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“…The office room was connected to district cooling and biomass-based district heating systems in order to provide the energy needed for space cooling and space heating. Biomass-based district heating systems in Sweden have less environmental impact than other energy supply systems, and are therefore the most commonly used systems in this country (Gustafsson, Gustafsson, Myhren, Bales, & Holmberg, 2016). The district heating and cooling systems, with distribution temperatures of 80°C and 14°C respectively, were assumed to be ideal.…”

Section: Methodsmentioning

confidence: 99%

Applying a decision-making framework for resolving conflicts when selecting windows and blinds

Jalilzadehazhari

Johansson

Mahapatra

2018

Architectural Engineering and Design Management

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The selection of the most appropriate window and blind design is a challenging task due to the existence of potential conflicts between visual comfort, thermal comfort, energy consumption and life cycle cost. Resolving these conflicts relies on a trade-off window and blind design. This research applied a decision-making framework to select a trade-off window and blind design for an office room in Sweden. The decisionmaking framework was developed based on integrating the nondominated sorting genetic algorithm-II and the analytical hierarchy process. The first step in the application of the framework was to generate a model of the office room using EnergyPlus. Six types of window and four types of blind; an internal venetian blind, an internal roller curtain, an external venetian blind and an external overhang panel, were modelled in EnergyPlus. The second step was to run an optimisation using non-dominated sorting genetic algorithm-II. For this purpose, various window and blind design variables were specified in modeFRONTIER platform. The third and last step in the application of the decision-making framework was to select a trade-off window and blind design using analytical hierarchy process. The results show the strength of the decision-making framework in selecting a trade-off design, and thereby the ability to resolve conflicts through intelligent use of simulation in analyzing big-data in built environment, energy and cost sectors. Since, the computation and processing power for performing simulations is constantly increasing, architects and designers can exploit the decision-making framework and locate a trade-off design in a relatively short period of time.

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“…The office building was connected to the biomass-based district heating system, which provided the energy needed for space heating and domestic hot water. Biomass-based district heating is the most prevalent heat supply system in Sweden due to its low environmental impact in comparison with other supply systems [25]. The distribution temperature of the district heating system was set at 80 • C. Furthermore, it was assumed that the system was ideal, and accordingly the efficiency of subsystems was equal to the unit.…”

Section: Stepmentioning

confidence: 99%

Achieving a Trade-Off Construction Solution Using BIM, an Optimization Algorithm, and a Multi-Criteria Decision-Making Method

2019

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The Energy Performance of Building Directive obligated all European countries to reduce the energy requirements of buildings while simultaneously improving indoor environment quality. Any such improvements not only enhance the health of the occupants and their productivity, but also provide further economic benefits at the national level. Accomplishing this task requires a method that allows building professionals to resolve conflicts between visual and thermal comfort, energy demands, and life-cycle costs. To overcome these conflicts, this study exploits the incorporation of building information modelling (BIM), the design of experiments as an optimization algorithm, and the analytical hierarchy process (AHP) into a multi-criteria decision-making method. Any such incorporation can (i) create constructive communication between building professionals, such as architects, engineers, and energy experts; (ii) allow the analysis of the performance of multiple construction solutions with respect to visual and thermal comfort, energy demand, and life-cycle costs; and (iii) help to select a trade-off solution, thereby making a suitable decision. Three types of energy-efficient windows, and five types of ground floors, roofs, and external wall constructions were considered as optimization variables. The incorporation of several methods allowed the analysis of the performance of 375 construction solutions based on a combination of optimization variables, and helped to select a trade-off solution. The results showed the strength of incorporation for analyzing big-data through the intelligent use of BIM and a simulation in the field of the built environment, energy, and costs. However, when applying AHP, the results are strongly contingent on pairwise comparisons.

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Techno-economic analysis of energy renovation measures for a district heated multi-family house

Cited by 51 publications

References 21 publications

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Applying a decision-making framework for resolving conflicts when selecting windows and blinds

Achieving a Trade-Off Construction Solution Using BIM, an Optimization Algorithm, and a Multi-Criteria Decision-Making Method

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