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Blomkvist, P., Karpouzoglou, T., Nilsson, D. & Wallin, J. (2023). Entrepreneurship and alignment work in the Swedish water and sanitation sector. Technology in society, 74, Article ID 102280.
Open this publication in new window or tab >>Entrepreneurship and alignment work in the Swedish water and sanitation sector
2023 (English)In: Technology in society, ISSN 0160-791X, E-ISSN 1879-3274, Vol. 74, article id 102280Article in journal (Refereed) Published
Abstract [en]

Water and sewage (WS) systems are, like most grid based infrastructural systems, often centralised and hierarchical and the end user has almost no possibility to influence the technical standards, business models or system architecture. The preferred method for connecting new areas to the grid are underground water pipes and gravity flow for sewage. Thus, the WS system is “tightly coupled”. It is hard to change and conservative in its system culture, exhibiting a strong “momentum” or “path dependence”. In this article we investigate an unusual case in the development of WS-systems. As a rule, WS-systems, as most infrastructural systems, develop gradually through incremental innovations, and system owners/utilities traditionally build their systems “from the inside out”. In our case, we investigate a situation where the end users took the initiative to connect a residential area, Aspvik, part of the municipality of Värmdö, outside Stockholm, Sweden, to the municipal grid and thus expand the WS-system, not from the inside out, but from the outside in. Furthermore, we highlight another unusual feature: the role of a resident that acted as the “entrepreneur” in this process of WS-system expansion. The entrepreneur had unique trust building abilities in the local community, which the regime actor (the WS utility), could not match. Historically, inventor-entrepreneurs have been common, acting as “system builders” in the establishment phase of new infrastructural systems. However, entrepreneurs outside the regime are not common in the WS sector. Although atypical in mature WS systems in developed countries, these types of local initiatives or hybrid solutions are common in developing countries. In this article, we argue that there are lessons to be learnt from our case, when dealing with system expansion processes both inside and outside the Global North.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Entrepreneurship, Infrastructure, Innovation, Sustainability transitions, Water and sanitation systems (WSS)
National Category
Water Engineering Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-331429 (URN)10.1016/j.techsoc.2023.102280 (DOI)001030441400001 ()2-s2.0-85161852790 (Scopus ID)
Note

QC 20231122

Available from: 2023-07-10 Created: 2023-07-10 Last updated: 2023-11-22Bibliographically approved
Nilsson, D., Karpouzoglou, T., Wallin, J., Blomkvist, P., Golzar, F. & Martin, V. (2023). Is on-property heat and greywater recovery a sustainable option? A quantitative and qualitative assessment up to 2050. Energy Policy, 182, 113727
Open this publication in new window or tab >>Is on-property heat and greywater recovery a sustainable option? A quantitative and qualitative assessment up to 2050
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2023 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 182, p. 113727-Article in journal (Refereed) Published
Abstract [en]

This article deals with ongoing attempts to recover heat and greywater at property level, based on an in-depth study of Stockholm, Sweden. We explore different socio-technical development paths from now up until 2050 using a novel combination of on-property technology case-studies, actor studies and system-level scenario evaluation, based on Artificial Neural Networks modelling. Our results show that the more conservative scenarios work in favour of large-scale actors while the more radical scenarios benefit the property owners. However, in the radical scenarios we identify disruptive effects on a system level due to disturbance on wastewater treatment plants, where incoming wastewater can be critically low for up to 120 days per year. At the same time, net energy savings are relatively modest (7.5% of heat demand) and economic gains for property owners small or uncertain. Current policies at EU and national level around energy-efficient buildings risk being counter-productive in cases when they push property owners to install wastewater heat recovery technology which, in places like Stockholm, can create suboptimal outcomes at the system level.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Heat and water recovery; Urban energy policy; System modelling; Future scenarios; Actor-driven disruption
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-334678 (URN)10.1016/j.enpol.2023.113727 (DOI)001051815500001 ()2-s2.0-85166184740 (Scopus ID)
Funder
Swedish Research Council Formas, 2018-00239
Note

QC 20230824

Available from: 2023-08-24 Created: 2023-08-24 Last updated: 2023-09-21Bibliographically approved
Wallin, J., Knutsson, J. & Karpouzoglou, T. (2021). A multi-criteria analysis of building level graywater reuse for personal hygiene. Resources, Conservation & Recycling Advances, 12, 200054-200054, Article ID 200054.
Open this publication in new window or tab >>A multi-criteria analysis of building level graywater reuse for personal hygiene
2021 (English)In: Resources, Conservation & Recycling Advances, ISSN 2667-3789, Vol. 12, p. 200054-200054, article id 200054Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier BV, 2021
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-307178 (URN)10.1016/j.rcradv.2021.200054 (DOI)2-s2.0-85126776784 (Scopus ID)
Funder
Swedish Research Council Formas
Note

QC 20220117

Available from: 2022-01-13 Created: 2022-01-13 Last updated: 2022-06-25Bibliographically approved
Wallin, J. (2021). Case studies of four installed wastewater heat recovery systems in Sweden. CASE STUDIES IN THERMAL ENGINEERING, 26, Article ID 101108.
Open this publication in new window or tab >>Case studies of four installed wastewater heat recovery systems in Sweden
2021 (English)In: CASE STUDIES IN THERMAL ENGINEERING, ISSN 2214-157X, Vol. 26, article id 101108Article in journal (Refereed) Published
Abstract [en]

The energy demand for tap water heating is significant in the developed world and significant to buildings energy performance. However, little attention is given to this untapped potential of heat recovery from wastewater. The purpose of this investigation is to investigate performance of different wastewater heat recovery systems to obtain more knowledge on how these systems perform in reality. Four systems were investigated showing that the annual heat recovery ratios between 17 and 43% and annual heat recovery per heat transfer areas between 1586 and 13 108 kWh/m(2). The paper also proposes a design equation with a validated accuracy of +/- 15% for sizing horizontal wastewater heat exchangers in wastewater heat recovery systems.

Place, publisher, year, edition, pages
Elsevier BV, 2021
Keywords
Wastewater heat recovery, Performance analysis, Wastewater heat recovery sizing equation
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-299486 (URN)10.1016/j.csite.2021.101108 (DOI)000674530200006 ()2-s2.0-85107458644 (Scopus ID)
Note

QC 20210812

Available from: 2021-08-12 Created: 2021-08-12 Last updated: 2022-06-25Bibliographically approved
Karpouzoglou, T., Blomkvist, P., Golzar, F., Nilsson, D., Silveira, S. & Wallin, J. (2020). Winners and losers during transition: the case of urban water and energy systems in Sweden. In: : . Paper presented at 11th International Sustainability Transitions Conference.
Open this publication in new window or tab >>Winners and losers during transition: the case of urban water and energy systems in Sweden
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2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Globally, there is an increasing consensus around the need to realise deep transformations invital sectors of society such as those related to urban water supply and energy, particularly in cities where the largest share of the global population is living. Taking the example of recent changes in energy requirements for buildings in Sweden, the government has proposed that, by 2021, all new houses shall have” near zero” energy demand, which for a multifamily house in Stockholm translates into a primary energy demand of 85 kWh /m2 per year. This has generated a new kind of niche experimentation in the building sector that cuts across traditionally disconnected domains of innovation around water and energy. For example, technologies around greywater re-use and heat recovery from wastewater have become associated with reduction in water use and important energy gains. These innovations propel private users and organisations - notably in the real estate sector - towards new investments as part of realising ambitious energy and water targets. As end-users of networked water and energy services, actors make technology-decisions that save energy, water and reduce their dependence on centralised network providers. But this also causes negative commercial and physical effects on the established networked configurations of water and energy, in the form of reduced economic revenue, less heat circulation, and colder wastewater causing problems in the treatment plants. In our study we focus on the winnersand losers of energy and water transition in Sweden, to learn about how transition in energy and water is evolving and why it is being negotiated along particular trajectories by a range of relevant actors.

Keywords
interface misalignment; critical interface; regime actor; niche actor; water energy nexus; greywater reuse
National Category
Social Sciences
Identifiers
urn:nbn:se:kth:diva-282928 (URN)
Conference
11th International Sustainability Transitions Conference
Funder
Swedish Research Council Formas, 2018-00239
Note

QC 20201012

Available from: 2020-10-02 Created: 2020-10-02 Last updated: 2022-12-01Bibliographically 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: 2023-12-07Bibliographically 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 BV, 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: 2023-12-07Bibliographically 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: 2023-12-07Bibliographically approved
Wallin, J. & Claesson, J. (2014). Analyzing the efficiency of a heat pump assisted drain water heat recovery system that uses a vertical inline heat exchanger. Sustainable Energy Technologies and Assessments, 8, 109-119
Open this publication in new window or tab >>Analyzing the efficiency of a heat pump assisted drain water heat recovery system that uses a vertical inline heat exchanger
2014 (English)In: Sustainable Energy Technologies and Assessments, ISSN 2213-1388, E-ISSN 2213-1396, Vol. 8, p. 109-119Article in journal (Refereed) Published
Abstract [en]

The purpose of the present study is to accumulate knowledge on how a drain water heat recovery system using a vertical inline heat exchanger and a heat pump performs under different drain water flow profile scenarios. Investigating how the intermittent behavior of the drain water influences the performance for this type of system is important because it gives insight on how the system will perform in a real life situation. The scenarios investigated are two 24. h drain water flow rate schedules and one shorter schedule representing a three minute shower.The results from the present paper add to the knowledge on how this type of heat recovery system performs in a setting similar to a multi-family building and how sizing influences the performance. The investigation shows that a heat recovery system of this type has the possibility to recover a large portion of the available heat if it has been sized to match the drain water profile. Sizing of the heat pump is important for the system performance; sizing of the storage tank is also important but not as critical.

Keywords
Coiled heat exchanger, Drain water heat recovery, Falling film heat exchanger, Heat pump heat recovery
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-148780 (URN)10.1016/j.seta.2014.08.003 (DOI)000218677100011 ()2-s2.0-84907169290 (Scopus ID)
Note

QC 20150317. Updated from accepted to published.

Available from: 2014-08-11 Created: 2014-08-11 Last updated: 2022-06-23Bibliographically approved
Wallin, J. & Claesson, J. (2014). Improving heat recovery using retrofitted heat pump in air handling unit with energy wheel. Applied Thermal Engineering, 62(2), 823-829
Open this publication in new window or tab >>Improving heat recovery using retrofitted heat pump in air handling unit with energy wheel
2014 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 62, no 2, p. 823-829Article in journal (Refereed) Published
Abstract [en]

The world is facing a challenge to reduce energy use to meet the environmental goals set for the future. One factor that has a great impact on the energy performance of buildings is the ventilation losses. To handle these losses, heat recovery systems with rotating heat exchanger are often implemented. These systems have been shown to recover about 60-70% of the energy in the exhaust air on an annual basis. After a heat recovery system is installed it is hard to improve the efficiency of the installed recovery system with an acceptable economic payback period. In the present paper one way to improve the energy performance of a building with this type of heat recovery system by the use of a heat pump is investigated by simulations in TrnSys. The heat pump system is arranged so that the evaporator is connected to a heat exchanger mounted in the exhaust airstream after the energy wheel, and the condenser of the heat pump is mounted so that the temperature of return water from the heating coil is increased. The simulations show that there is a possibility to increase the heat recovery rate of the air handling unit in a significant way by retrofitting a heat pump to the system.

Keywords
Efficiency, Heat pump retrofit, Ventilation heat recovery, Air handling units, Energy performance, Energy performance of buildings, Heat pumps, Heat recovery systems, Payback periods, Recovery systems, Energy efficiency, Heat pump systems, Investments, Retrofitting, Waste heat, Waste heat utilization
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-139972 (URN)10.1016/j.applthermaleng.2013.09.059 (DOI)000330910700058 ()2-s2.0-84889576167 (Scopus ID)
Note

QC 20140121

Available from: 2014-01-21 Created: 2014-01-16 Last updated: 2022-06-23Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3194-1762

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