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Kordas, O. & Nikiforovich, E. (2019). A phenomenological theory of steady-state vertical geothermal systems: A novel approach. Energy, 175, 23-35
Open this publication in new window or tab >>A phenomenological theory of steady-state vertical geothermal systems: A novel approach
2019 (English)In: Energy, ISSN 0360-5442, Vol. 175, p. 23-35Article in journal (Refereed) Published
Abstract [en]

This paper proposes a novel approach for studying the stationary energy characteristics of vertical geothermal systems (VGS) using stationary two-dimensional phenomenological mathematical theory. The approach describes VGS as a single, strongly nonequilibrium thermodynamic system consisting of a soil, a borehole with secondary fluid and a ground source heat pump (GSHP). The model uses continuity conditions for temperature and local heat fluxes between VGS components. The theory includes a special class of nonequilibrium spatial scale of VGS that is independent of its geometrical parameters. It is determined by the energy characteristics of the heat pump and the thermodynamic properties of soil and secondary fluid. Spatial variables can be chosen so that the energy characteristics of the VGS depend on only one dimensionless parameter (a similarity parameter), the thermal conductivity ratio of soil to secondary fluid. This considerably simplifies interpretation of theoretical and experimental results obtained using similarity methods. We show that, under real conditions of VGS functioning, the value of this similarity parameter varies from 0.5 to 10. The approach can be used to optimise GSHP systems to obtain energy of the required amount and quality to capitalise on heat pumps as ‘flexible agents’ in Smart Energy Systems.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-250460 (URN)10.1016/j.energy.2019.03.030 (DOI)000466999400003 ()2-s2.0-85063332591 (Scopus ID)
Note

QC 20190507

Available from: 2019-04-30 Created: 2019-04-30 Last updated: 2019-06-11Bibliographically approved
Pasichnyi, O., Wallin, J. & Kordas, O. (2019). Data-driven building archetypes for urban building energy modelling. Paper presented at 10th Biennial International Workshop on Advances in Energy Studies IWAES), SEP 25-28, 2017, Naples, ITALY. Energy, 181, 360-377
Open this publication in new window or tab >>Data-driven building archetypes for urban building energy modelling
2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 181, p. 360-377Article in journal (Refereed) Published
Abstract [en]

This paper presents an approach for using rich datasets to develop different building archetypes depending on the urban energy challenges addressed. Two cases (building retrofitting and electric heating) were analysed using the same city, Stockholm (Sweden), and the same input data, energy performance certificates and heat energy use metering data. The distinctive character of these problems resulted in different modelling workflows and archetypes being developed. The building retrofitting case followed a hybrid approach, integrating statistical and physical perspectives, estimating energy savings for 5532 buildings from seven retrofitting packages. The electric heating case provided an explicitly statistical data-driven view of the problem, estimating potential for improvement of power capacity of the local electric grid at peak electric power of 147 MW. The conclusion was that the growing availability of linked building energy data requires a shift in the urban building energy modelling (UBEM) paradigm from single-logic models to on-request multiple-purpose data intelligence services.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Building archetype, Urban building energy modelling, Building retrofitting, Electric heating, Stockholm
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-255724 (URN)10.1016/j.energy.2019.04.197 (DOI)000476965900030 ()2-s2.0-85067083111 (Scopus ID)
Conference
10th Biennial International Workshop on Advances in Energy Studies IWAES), SEP 25-28, 2017, Naples, ITALY
Note

QC 20190813

Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13Bibliographically approved
Pasichnyi, O., Levihn, F., Shahrokni, H., Wallin, J. & Kordas, O. (2019). Data-driven strategic planning of building energy retrofitting: The case of Stockholm. Journal of Cleaner Production, 233, 546-560
Open this publication in new window or tab >>Data-driven strategic planning of building energy retrofitting: The case of Stockholm
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2019 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 233, p. 546-560Article in journal (Refereed) Published
Abstract [en]

Limiting global warming to 1.5 degrees C requires a substantial decrease in the average carbon intensity of buildings, which implies a need for decision-support systems to enable large-scale energy efficiency improvements in existing building stock. This paper presents a novel data-driven approach to strategic planning of building energy retrofitting. The approach is based on the urban building energy model (UBEM), using data about actual building heat energy consumption, energy performance certificates and reference databases. Aggregated projections of the energy performance of each building are used for holistic city-level analysis of retrofitting strategies considering multiple objectives, such as energy saving, emissions reduction and required social investment. The approach is illustrated by the case of Stockholm, where three retrofitting packages (heat recovery ventilation; energy-efficient windows; and a combination of these) were considered for multi-family residential buildings constructed 1946-1975. This identified potential for decreasing heat demand by 334 GWh (18%) and consequent emissions reduction by 19.6 kt-CO2 per year. The proposed method allows the change in total energy demand from large-scale retrofitting to be assessed and explores its impact on the supply side. It thus enables more precisely targeted and better coordinated energy efficiency programmes. The case of Stockholm demonstrates the potential of rich urban energy datasets and data science techniques for better decision making and strategic planning.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2019
Keywords
Urban energy planning, Building energy retrofitting, Urban building energy modelling, High-resolution metered data, Urban energy efficiency, Stockholm
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-257536 (URN)10.1016/j.jclepro.2019.05.373 (DOI)000479025500044 ()2-s2.0-85067823472 (Scopus ID)
Note

QC 20190918

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-09-18Bibliographically approved
Mäkivierikko, A., Shahrokni, H. & Kordas, O. (2019). Designing energy feedback for a local social network. Energy and Buildings, 199, 88-101
Open this publication in new window or tab >>Designing energy feedback for a local social network
2019 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 199, p. 88-101Article in journal (Refereed) Published
Abstract [en]

Engaged households are needed for the future ‘smart grids’ to function, but it is difficult to engage residents in their household electricity consumption. Building on earlier research suggesting that a local social network could provide a suitable context for energy feedback, this paper examines how feedback presented in a social network should be designed in order to be better understood by the residents and encourage long-term engagement. A review of the literature on design principles and cases where they had been implemented identified 24 principles. A prototype feedback design adapted for a local social network was made, based on design principles deemed suitable for the screens designed. End-user feedback on the prototype was collected through a stakeholder consultation workshop. In the workshop dis- cussions, 17 identified principles were mentioned and there was support for 15 of these, one was both supported and contested and two were contested. Based on comments and suggestions from end-users, a revised version of the feedback prototype was made for implementation in a pilot study in Sweden and Portugal.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Environmental Sciences Information Systems, Social aspects Human Computer Interaction
Research subject
Industrial Ecology
Identifiers
urn:nbn:se:kth:diva-254918 (URN)10.1016/j.enbuild.2019.06.038 (DOI)000482245700008 ()2-s2.0-85068174524 (Scopus ID)
Funder
Vinnova, 2015–00305EU, Horizon 2020, 731218
Note

QC 20190917

Available from: 2019-07-09 Created: 2019-07-09 Last updated: 2019-09-17Bibliographically approved
Pasichnyi, O., Wallin, J., Levihn, F., Shahrokni, H. & Kordas, O. (2019). Energy performance certificates — New opportunities for data-enabled urban energy policy instruments?. Energy Policy, 486-499
Open this publication in new window or tab >>Energy performance certificates — New opportunities for data-enabled urban energy policy instruments?
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2019 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, p. 486-499Article in journal (Refereed) Published
Abstract [en]

Energy performance certificates (EPC) were introduced in European Union to support reaching energy efficiency targets by informing actors in the building sector about energy efficiency in buildings. While EPC have become a core source of information about building energy, the domains of its applications have not been studied systematically. This partly explains the limitation of conventional EPC data quality studies that fail to expose the essential problems and secure effective use of the data. This study reviews existing applications of EPC data and proposes a new method for assessing the quality of EPCs using data analytics. Thirteen application domains were identified from systematic mapping of 79 papers, revealing increases in the number and complexity of studies and advances in applied data analysis techniques. The proposed data quality assurance method based on six validation levels was tested using four samples of EPC dataset for the case of Sweden. The analysis showed that EPC data can be improved through adding or revising the EPC features and assuring interoperability of EPC datasets. In conclusion, EPC data have wider applications than initially intended by the EPC policy instrument, placing stronger requirements on the quality and content of the data.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Building energy efficiency, Data applications, Data quality, Energy performance certificate (EPC), Sweden
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-246466 (URN)10.1016/j.enpol.2018.11.051 (DOI)000463688200047 ()2-s2.0-85059551772 (Scopus ID)
Note

QC 20190328

Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-05-09Bibliographically approved
Ulgiati, S., Casazza, M., Kordas, O., Vanoli, L., Basosi, R. & Mauro, A. (2019). Energy technologies and perspectives for human and environmental wellbeing. Energy, 183, 1-3
Open this publication in new window or tab >>Energy technologies and perspectives for human and environmental wellbeing
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2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 183, p. 1-3Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
National Category
Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-260166 (URN)10.1016/j.energy.2019.06.125 (DOI)000483005400001 ()2-s2.0-85067899651 (Scopus ID)
Note

QC 20190930

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-09-30Bibliographically approved
Bögel, P., Pereverza, K., Upham, P. & Kordas, O. (2019). Linking socio-technical transition studies and organisational change management: Steps towards an integrative, multi-scale heuristic. Journal of Cleaner Production, 359-368
Open this publication in new window or tab >>Linking socio-technical transition studies and organisational change management: Steps towards an integrative, multi-scale heuristic
2019 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, p. 359-368Article in journal (Refereed) Published
Abstract [en]

While the role of agency is widely acknowledged in socio-technical transition research, there remains a research gap on agency in transitions and a call for studies using an actor-centred approach to transition studies. In response to this call, this paper addresses the role of actors and, particularly, organisations in transitions. It examines the role of organisational change in socio-technical sustainability transitions and, more specifically, how transition initiatives may trigger and support these changes in organisations and systems. For this purpose, the paper draws on literature from both transition studies and organisational change management (OCM) to build a multi-scale, integrative theoretical heuristic. This addresses drivers and barriers for organisational change as an integral part of transition processes, connecting the micro level of the individual, the meso level of the organisation and the macro level of the broader system in which the organisation is located. With the goal of illustrating the links between OCM and transition studies, this paper empirically examines the impact of Region 2050, a large, multi-organisation transition initiative in Sweden, in terms of creating change within the organisations involved. The main focus is on how the organisations acquire the new knowledge and capabilities required for improving regional planning for sustainability. The empirical study identifies leverage points at the micro-, meso- and macro-levels, which may be used in order to change strategic planning processes. Three different theoretical concepts from transition studies and OCM that could help to foster long-term planning are also identified: (1) the macro-level of institutional plurality and its connection to the meso- (organisational) level; (2) collaboration as a key success factor on the organisational level; and (3) at the micro-level, the roles of individuals as change agents and boundary spanners. Overall, the case highlights the merits of the OCM literature for transition studies and their emphasis on understanding interacting processes operating at multiple scales.

Keywords
sustainability transitions, organisations, change management, transition initiatives
National Category
Other Social Sciences
Identifiers
urn:nbn:se:kth:diva-246171 (URN)10.1016/j.jclepro.2019.05.286 (DOI)000477784000033 ()2-s2.0-85067301897 (Scopus ID)
Funder
Swedish Research Council Formas, FR-2018/0010
Note

QC 20190318

Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2019-08-20Bibliographically approved
Pereverza, K., Pasichnyi, O. & Kordas, O. (2019). Modular participatory backcasting: A unifying framework for strategic planning in the heating sector. Energy Policy, 124, 123-134
Open this publication in new window or tab >>Modular participatory backcasting: A unifying framework for strategic planning in the heating sector
2019 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 124, p. 123-134Article in journal (Refereed) Published
Abstract [en]

This study proposes a novel framework, modular participatory backcasting (mPB), for long-term planning in the heating sector. The mPB framework is based on participatory backcasting (PB) and integrates principles of modularity, participatory modelling, and transdisciplinarity. We discerned for mPB 13 modules that can be arranged according to the purpose and specifics of each planning process. The design of the mPB framework and its implementation are presented for the cases of participatory strategic planning processes to achieve sustainable heat provision by 2050 in a Ukrainian city (Bila Tserkva) and a Serbian city (Nis). The results show that mPB allows adaptability to local contexts and limitations through exclusion, augmentation, substitution, splitting and inverting properties of modularity; decreases the learning time for applying the framework in a novel context; increases the reproducibility and transparency of long-term energy planning processes; enables efficient integration of quantitative methods into the participatory process; and advances collaboration between academia and society. The proposed framework is beneficial for advancement of local planning and policy-making practices by creating strategies with a wider support of stakeholders. It could also be useful for further research through cross-case analysis.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Long-term planning, Heating sector, Participatory backcasting, Modularity, Participatory modelling, Transdisciplinarity
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-240696 (URN)10.1016/j.enpol.2018.09.027 (DOI)000453642600012 ()2-s2.0-85054469029 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 266587
Note

QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-03-13Bibliographically approved
Brown, M., Raugei, M., Viglia, S., Casazza, M., Schnitzer, H., Kordas, O. & Ulgiati, S. (2018). Editorial: Indicators of Energy Use in Urban Systems. Ecological Indicators, 94, 1-3
Open this publication in new window or tab >>Editorial: Indicators of Energy Use in Urban Systems
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2018 (English)In: Ecological Indicators, ISSN 1470-160X, E-ISSN 1872-7034, Vol. 94, p. 1-3Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-240775 (URN)10.1016/j.ecolind.2018.09.038 (DOI)000452692400001 ()2-s2.0-85054916957 (Scopus ID)
Note

QC 20190104

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-04Bibliographically approved
Nilsson, A., Lazarevic, D., Brandt, N. & Kordas, O. (2018). Household responsiveness to residential demand response strategies - Results and policy implications from a Swedish field study. Energy Policy
Open this publication in new window or tab >>Household responsiveness to residential demand response strategies - Results and policy implications from a Swedish field study
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2018 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777Article in journal (Refereed) Published
Abstract [en]

To realize the benefits of smart grids, residential demand response (DR) aims to increase demand flexibility by influence household electricity consumption. Although price-based DR programs have shown potential, there is a need to further investigate the effectiveness of DR in energy strategy and policy development. The evaluation of DR has focused on the impact on overall power demand, assuming that consumers are economically rational decision-maker. However, recent findings suggest that consumer responses have been insufficient and calls have been made to identify novel evaluation approaches that better reflect the human dimension of energy consumption. Continuing this line of enquiry, this paper aims to investigate the effectiveness of DR and explore the potential of environmental incentives for increased consumer engagement. We propose an interdisciplinary evaluation framework to understand variations in household responsiveness to DR strategies, which is tested in a Swedish DR field trial covering 136 households during 2017. Results suggest that the effectiveness of DR varies widely across household type; ranging from substantial reductions in overall consumption and during peak periods, to increases in consumption during peak periods. Furthermore, a clear favor of price incentives, compared to environmental incentives, as the most efficient strategy to increase demand flexibility was observed.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-239302 (URN)10.1016/j.enpol.2018.07.044 (DOI)000447576700026 ()2-s2.0-85050794561 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-19 Created: 2018-11-19 Last updated: 2019-05-27Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7020-1551

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