kth.sePublications
Change search
Link to record
Permanent link

Direct link
Lundqvist, Per, ProfessorORCID iD iconorcid.org/0000-0002-0744-6932
Publications (10 of 55) Show all publications
Bäcklund, K., Lundqvist, P. & Molinari, M. (2024). Showcasing a Digital Twin for Higher Educational Buildings: Developing the Concept Towards Human Centricity. Frontiers in Built Environment, 10, Article ID 1347451.
Open this publication in new window or tab >>Showcasing a Digital Twin for Higher Educational Buildings: Developing the Concept Towards Human Centricity
2024 (English)In: Frontiers in Built Environment, E-ISSN 2297-3362, Vol. 10, article id 1347451Article in journal (Refereed) Published
Abstract [en]

Digital twin technology is an emerging technology within the built environment. There are yet many unexplored opportunities to utilize digital twins for facilitating the transformation towards a climate neutral building stock while also meeting the expectations from the building occupants. This article presents a case study of a digital twin, developed for an existing commercial building stock of campus areas in Sweden. The overarching purpose of the digital twin is to support both building occupants and building operators. This twofold human-centric approach represents a novel approach for building digital twins. The digital twin is based on 3D scanning and together with geospatial data, a real-like navigational indoor environment is created. Three innovative features are presented; the building analysis module, the digital twin mobile application and the building operations module. The results show that the digital twin improves the building occupant’s experience by supporting navigation and providing access to room booking system via this dedicated interface. Building management is also benefited by the digital twin through easier access to building data aggregated into one platform and a state-of-the-art analysis tool for optimizing the use of indoor space. The digital twin holds future potential to achieve operational excellence by incorporating feedback mechanisms and utilizing Artificial Intelligence to enable intelligent fault detection and prevention.

  Keywords: 

Place, publisher, year, edition, pages
Frontiers Media SA, 2024
Keywords
Digital Twin, Human-centric, Higher educational buildings, building occupants, Building operators, Sustaina
National Category
Architectural Engineering Social Sciences Building Technologies
Identifiers
urn:nbn:se:kth:diva-343531 (URN)10.3389/fbuil.2024.1347451 (DOI)001175692200001 ()2-s2.0-85186412533 (Scopus ID)
Projects
Cost- and Energy-Efficient Control Systems for Buildings
Funder
Swedish Energy Agency, 47859-1
Note

QC 20240313

Available from: 2024-02-15 Created: 2024-02-15 Last updated: 2024-04-24Bibliographically approved
Bäcklund, K., Molinari, M., Lundqvist, P. & Palm, B. (2023). Building Occupants, Their Behavior and the Resulting Impact on Energy Use in Campus Buildings: A Literature Review with Focus on Smart Building Systems. Energies, 16(17), 6104-6104
Open this publication in new window or tab >>Building Occupants, Their Behavior and the Resulting Impact on Energy Use in Campus Buildings: A Literature Review with Focus on Smart Building Systems
2023 (English)In: Energies, E-ISSN 1996-1073, Vol. 16, no 17, p. 6104-6104Article in journal (Refereed) Published
Abstract [en]

In the light of global climate change and the current energy crisis, it is crucial to target sustainable energy use in all sectors. Buildings still remain one of the most energy-demanding sectors. Campus buildings and higher educational buildings are important to target due to their high and increasing energy demand. This building segment also represents a research gap, as mostly office or domestic buildings have been studied previously. In the quest for thermal comfort, a key stakeholder in building energy demand is the building occupant. It is therefore crucial to promote energy-aware behaviors. The building systems are another key factor to consider. As conventional building systems are replaced with smart building systems, the entire scenario is redrawn for how building occupants interact with the building and its systems. This study argues that behavior is evolving with the smartness of building systems. By means of a semi-systematic literature review, this study presents key findings from peer-reviewed research that deal with building occupant behavior, building systems and energy use in campus buildings. The literature review was an iterative process based on six predefined research questions. Two key results are presented: a graph of reported energy-saving potentials and a conceptual framework to evaluate building occupants impact on building energy use. Furthermore, based on the identified research gaps in the selected literature, areas for future research are proposed.

Place, publisher, year, edition, pages
MDPI AG, 2023
Keywords
behavior; energy use; campus buildings; building occupants; smart building systems; educational buildings
National Category
Building Technologies
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-344411 (URN)10.3390/en16176104 (DOI)001070065200001 ()2-s2.0-85170534245 (Scopus ID)
Funder
Swedish Energy Agency, 2018-016237
Note

QC 20240315

Available from: 2024-03-15 Created: 2024-03-15 Last updated: 2024-03-15Bibliographically approved
Bäcklund, K., Molinari, M. & Lundqvist, P. (2023). In Search for Untapped Energy-Saving Potential in Green and Smart Higher Educational Buildings—An Empirical Case Study Involving the Building Occupants. Buildings, 13(12), Article ID 3103.
Open this publication in new window or tab >>In Search for Untapped Energy-Saving Potential in Green and Smart Higher Educational Buildings—An Empirical Case Study Involving the Building Occupants
2023 (English)In: Buildings, E-ISSN 2075-5309, Vol. 13, no 12, article id 3103Article in journal (Refereed) Published
Abstract [en]

Energy-intense activities and the unpredictable and complex behavior of building occupants lead to an increase in building energy demand. It is, therefore, crucial to study underlying factors for building energy demand related to the users. Higher educational buildings are relevant to study for several reasons: they host the future workforce and citizens, they are predicted to increase in numbers, and they represent a building type less studied. Furthermore, green-rated buildings equipped with smart building systems also represent a research gap that is relevant to address since such a building design involves IoT-functionalities and digital features for the building occupants to interact with. There is also a conceivable risk that if the users know that the building is green-rated and technologically advanced, this may alter their perception of the building operation and thus their behavior. To study the relationship between building occupants and such green and smart educational structure, a survey was conducted in a Swedish higher educational building; as a result, 300 responses were collected and analyzed. The responses revealed that the building occupants act with energy awareness, and they are conscious about energy-saving behaviors. One building feature in particular was studied: the Digital Room Panels (DRPs). The DRP allows the building occupants to modify the indoor temperature and is, therefore, essential for thermal comfort. One key finding from the survey revealed that 70% of the building occupants did not know how the DRPs operate. This study argues that this result can be explained with a lack of communication and user friendliness. Inadequate interactions with building systems could also result in opportunities for energy saving might not be realized. The findings of this case study led to valuable recommendations and suggestions for future research endeavors.

Place, publisher, year, edition, pages
MDPI AG, 2023
Keywords
commercial buildings; campus; energy use; building occupants; behavior; energy awareness; green-rated buildings; smart building systems; indoor environmental quality
National Category
Building Technologies
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-344412 (URN)10.3390/buildings13123103 (DOI)001130606300001 ()2-s2.0-85180648407 (Scopus ID)
Funder
Swedish Energy Agency, 2018-016237Swedish Foundation for Strategic Research, RIT17-0046
Note

QC 20240315

Available from: 2024-03-15 Created: 2024-03-15 Last updated: 2024-03-15Bibliographically approved
Molinari, M., Anund Vogel, J., Rolando, D. & Lundqvist, P. (2023). Using living labs to tackle innovation bottlenecks: the KTH Live-In Lab case study. Applied Energy, 338, 120877-120877, Article ID 120877.
Open this publication in new window or tab >>Using living labs to tackle innovation bottlenecks: the KTH Live-In Lab case study
2023 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 338, p. 120877-120877, article id 120877Article in journal (Refereed) Published
Abstract [en]

The adoption of innovation in the building sector is currently too slow for the ambitious sustainability goals thatour societies have agreed upon. Living labs are open innovation ecosystems in real-life environments usingiterative feedback processes throughout a lifecycle approach of an innovation to create sustainable impact. In thecontext of the built environment, such co-creative innovation and demonstration platforms are needed tofacilitate the adoption of innovative technologies and concepts for more energy-efficient and sustainablebuildings. However, their feasibility is not extensively proven. This paper illustrates the implementation anddemonstrates the feasibility of the Living Labs Triangle Framework for buildings living labs. This conceptualframework has been used to conceive the KTH Live-In Lab, a living lab for buildings. The goal of the Live-In Labwas to create a co-creative open platform for research and education bridging the gap between industry andacademia, featuring smart building demonstrators. The Living Lab Triangle Framework has been deployed tomeet the goals of the Live-in Lab, and the resulting concept is described. This paper then analyses the meth-odological and operational results introducing performance metrics to measure the economic sustainability, thepromotion of multidisciplinary research and development projects, dissemination and impact. The results arecompleted with a SWOT analysis identifying its current strengths and weaknesses. The results collected in thiswork fill a missing gap in the scientific literature on the performance of living labs and provide empirical evi-dence on the sustainability and impact of living labs.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Living labs Innovation Building industry Smart buildings Building demonstrators Built environment
National Category
Energy Engineering Building Technologies
Research subject
Energy Technology; Civil and Architectural Engineering, Building Technology
Identifiers
urn:nbn:se:kth:diva-324845 (URN)10.1016/j.apenergy.2023.120877 (DOI)000955580100001 ()2-s2.0-85150014674 (Scopus ID)
Funder
Swedish Energy Agency, 47859-1Swedish Foundation for Strategic Research, RIT17-0046
Note

QC 20230321

Available from: 2023-03-17 Created: 2023-03-17 Last updated: 2023-04-14Bibliographically approved
Malakhatka, E. & Lundqvist, P. (2022). Actors’ Network Analysis and Bi-Directional Value Exchange Matrix Development for Living Labs: KTH Live-In-Lab Case Study. In: Shaun West, Jürg Meierhofer, Utpal Mangla (Ed.), Smart Services Summit: Smart Services Supporting the New Normal (pp. 139-147). Springer
Open this publication in new window or tab >>Actors’ Network Analysis and Bi-Directional Value Exchange Matrix Development for Living Labs: KTH Live-In-Lab Case Study
2022 (English)In: Smart Services Summit: Smart Services Supporting the New Normal / [ed] Shaun West, Jürg Meierhofer, Utpal Mangla, Springer, 2022, p. 139-147Chapter in book (Refereed)
Abstract [en]

In the scientific literature and in practice, quite a lot of attention is paidto the actors’ network analysis in living labs. Still, there is a lack of studies onvalue exchange between different actors in living laboratories. This study selectedthe distributed structure of the actors’ network in living lab since most European residential laboratories function according to this model. In the course of this exploratory study, we conducted two workshops: the first with participants from several European residential laboratories to discuss and co-design a framework for analyzingthe exchange of value between different stakeholders, and the second workshop—case study, where the proposed framework was applied on the actors network of the existed living laboratory—KTH Live-in-Lab. As a result, we got a detailed pictureof the network of actors and value exchange within the value co-creation model forKTH Live-in-Lab (Smart Home Services project).

Place, publisher, year, edition, pages
Springer, 2022
Keywords
Actors’ network analysis · Value exchange system · Living lab · Smarthome services
National Category
Information Systems
Research subject
Information and Communication Technology; Civil and Architectural Engineering, Building Service and Energy Systems
Identifiers
urn:nbn:se:kth:diva-311995 (URN)10.1007/978-3-030-97042-0_14 (DOI)000926159500015 ()
Note

Part of book: ISBN 978-3-030-97042-0

QC 20220817

Available from: 2022-05-06 Created: 2022-05-06 Last updated: 2024-03-18Bibliographically approved
Malakhatka, E., Lundqvist, P., Shafqat, O. & De Bellefon, A. (2022). Identification of everyday food-related activities with potential for direct and indirect energy savings: KTH Live–in–Lab explorative case study. Energy Policy, 163, 112792-112792, Article ID 112792.
Open this publication in new window or tab >>Identification of everyday food-related activities with potential for direct and indirect energy savings: KTH Live–in–Lab explorative case study
2022 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 163, p. 112792-112792, article id 112792Article in journal (Refereed) Published
Abstract [en]

This exploratory study analyses the daily activities of the end-user in terms of assessing the potential for conserving direct and indirect energy. In the course of the study, a socio-technological system approach was applied, which made it possible to combine the methods of analysis and interaction of the social group (students) and technical infrastructure (living laboratory). The method of creating personas was also applied to segregate a large group of the population within one segment. This approach allowed us to consider in more detail the different types of behavior in the same segment. As a result, we got more personalized strategies for changing a behavior tailored for each individual persona. In conclusion, a recommendation was given on which policies implications and to which organizations to address.

Place, publisher, year, edition, pages
Elsevier BV, 2022
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-311343 (URN)10.1016/j.enpol.2022.112792 (DOI)000773503000007 ()2-s2.0-85124542645 (Scopus ID)
Note

QC 20220422

Available from: 2022-04-22 Created: 2022-04-22 Last updated: 2022-06-25Bibliographically approved
Shahrooz, M., Lundqvist, P. & Neksa, P. (2022). Performance of binary zeotropic mixtures in organic Rankine cycles (ORCs). Energy Conversion and Management, 266, 115783, Article ID 115783.
Open this publication in new window or tab >>Performance of binary zeotropic mixtures in organic Rankine cycles (ORCs)
2022 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 266, p. 115783-, article id 115783Article in journal (Refereed) Published
Abstract [en]

Compared to pure fluids, zeotropic mixtures have the potential to lower the irreversibilities in low temperature Rankine cycles by better temperature profile matching of the working fluid with the heat source/sink. However, having a gliding temperature does not guarantee performance boost over pure fluids, as many factors influence the exergy efficiency of the cycle. In this study, 25 pure fluids and 104 binary mixtures of natural working fluids are analyzed in subcritical ORCs with heat source temperature range of 125-300 degrees C and different condensing conditions and the results are investigated within two frameworks: (1) comparing the mixtures to their pure constituents, (2) comparing the mixtures to the best performing pure fluid. In one behavior type, the performance of the mixture falls between the performance of its pure constituents for all evaporator pressure range, and the mixture provides no benefit. However, some mixtures could provide performance boost in a specific evaporator range. Therefore, the maximum allowable evaporator pressure plays an important role in the performance comparison of zeotropic mixtures to their pure constituents. Mixtures which outperform their pure constituents in the first perspective, are further analyzed in the second perspective. Finally, a screening method is presented to map the binary mixtures with performance boost compared to their pure constituents and high absolute exergy efficiency. This method is based on the key thermophysical properties of the fluids including critical temperature and normal boiling point, as well as working conditions such as heat source and heat sink temperature and PPTD in the evaporator and the condenser.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
ORC, Rankine cycle, Zeotropic mixture, Binary mixture, Natural fluids, Waste heat recovery
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-315689 (URN)10.1016/j.enconman.2022.115783 (DOI)000817752100003 ()2-s2.0-85131634903 (Scopus ID)
Note

QC 20220715

Available from: 2022-07-15 Created: 2022-07-15 Last updated: 2022-08-08Bibliographically approved
Bäcklund, K., Molinari, M., Lundqvist, P. & Karlsson, P. (2022). Showcasing the First Steps Towards a Digital Twin for Campus Environments. In: 2022 BuildSim Nordic: . Paper presented at BuildSim Nordic 2022:10th BuildSim Nordic conference and the 2nd International Nordic conference for IBPSA, 22nd-23rd August 2022, Copenhagen, Denmark.
Open this publication in new window or tab >>Showcasing the First Steps Towards a Digital Twin for Campus Environments
2022 (English)In: 2022 BuildSim Nordic, 2022Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a path towards the implementation of a Digital Twin for campus environments. The main purpose of the Digital Twin is to accomplish an advanced analytical tool, which supports building owners, building operators and building users to reach an improved performance of the building. Digital Twins is new to the building and the real estate industry, hence research within this field is scarce. This paper contributes to the research by providing a methodology to implement a Digital Twin of an existing building stock of campus areas in Sweden. The main results obtained so far are presented. They indicate that the potential of a Digital Twin expands beyond the aspects of a navigational digital 3D model, including a state-of-the-art app that is developed from the Digital Twin platform.  

Keywords
Digital Twin, Buildings, Sustainable Development
National Category
Engineering and Technology
Research subject
Real Estate and Construction Management; Energy Technology
Identifiers
urn:nbn:se:kth:diva-316966 (URN)10.1051/e3sconf/202236210003 (DOI)2-s2.0-85146865740 (Scopus ID)
Conference
BuildSim Nordic 2022:10th BuildSim Nordic conference and the 2nd International Nordic conference for IBPSA, 22nd-23rd August 2022, Copenhagen, Denmark
Projects
Cost and Energy-Efficient Control Systems for Buildings
Funder
Swedish Energy Agency, 47859-1
Note

QC 20220905

Available from: 2022-09-02 Created: 2022-09-02 Last updated: 2023-08-14Bibliographically approved
Malakhatka, E., Sopjani, L. & Lundqvist, P. (2021). Co-Creating Service Concepts for the Built Environment Based on the End-User's Daily Activities Analysis: KTH Live-in-Lab Explorative Case Study. Sustainability, 13(4), Article ID 1942.
Open this publication in new window or tab >>Co-Creating Service Concepts for the Built Environment Based on the End-User's Daily Activities Analysis: KTH Live-in-Lab Explorative Case Study
2021 (English)In: Sustainability, E-ISSN 2071-1050, Vol. 13, no 4, article id 1942Article in journal (Refereed) Published
Abstract [en]

The purpose of this study is to synthesize the widely used theories about co-creation from two main perspectives: co-creation as an innovation process and co-creation as a design process applied to the service concept design in the built environment context. The architecture, engineering, and construction (AEC) industry do not have much application of end-user-oriented service design in general, especially with intensive co-creation processes. To facilitate such a process, we are using a living lab environment as a laboratorial model of the real built environment, but with the opportunity to have access to the end-users and different types of stakeholders. Using the KTH Live-in-Lab explorative case study, we were able to discuss the concept of co-creation by distinguishing between co-creation as innovation and co-creation as a design process, facilitating the process of co-creation of service concepts for the proposed built environment including methods from both perspectives: innovation and design, and evaluating the process of service concepts co-creation for the built environment from the point of innovation, knowledge transfer, sustainability, and user experience.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
co-creation, service concept, living lab environment, built environment
National Category
Business Administration
Identifiers
urn:nbn:se:kth:diva-292588 (URN)10.3390/su13041942 (DOI)000624838800001 ()2-s2.0-85101635146 (Scopus ID)
Note

QC 20210412

Available from: 2021-04-12 Created: 2021-04-12 Last updated: 2022-06-25Bibliographically approved
Malakhatka, E., Al Rahis, A., Osman, O. & Lundqvist, P. (2021). Monitoring and Predicting Occupant's Sleep Quality by Using Wearable Device OURA Ring and Smart Building Sensors Data (Living Laboratory Case Study). Buildings, 11(10), Article ID 459.
Open this publication in new window or tab >>Monitoring and Predicting Occupant's Sleep Quality by Using Wearable Device OURA Ring and Smart Building Sensors Data (Living Laboratory Case Study)
2021 (English)In: Buildings, E-ISSN 2075-5309, Vol. 11, no 10, article id 459Article in journal (Refereed) Published
Abstract [en]

Today's commercially-off-the-shelf (COST) wearable devices can unobtrusively capture several important parameters that may be used to measure the indoor comfort of building occupants, including ambient air temperature, relative humidity, skin temperature, perspiration rate, and heart rate. These data could be used not only for improving personal wellbeing, but for adjusting a better indoor environment condition. In this study, we have focused specifically on the sleeping phase. The main purpose of this work was to use the data from wearable devices and smart meters to improve the sleep quality of residents living at KTH Live-in-Lab. The wearable device we used was the OURA ring which specializes in sleep monitoring. In general, the data quality showed good potential for the modelling phase. For the modelling phase, we had to make some choices, such as the programming language and the AI algorithm, that was the best fit for our project. First, it aims to make personal physiological data related studies more transparent. Secondly, the tenants will have a better sleep quality in their everyday life if they have an accurate prediction of the sleeping scores and ability to adjust the built environment. Additionally, using knowledge about end users can help the building owners to design better building systems and services related to the end-user's wellbeing.

Place, publisher, year, edition, pages
MDPI AG, 2021
Keywords
sleep quality, wearable device, smart building sensors, thermal comfort, data storage, data quality assessment, ANN
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-305089 (URN)10.3390/buildings11100459 (DOI)000715446700001 ()2-s2.0-85117252521 (Scopus ID)
Note

QC 20211123

Available from: 2021-11-23 Created: 2021-11-23 Last updated: 2024-01-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0744-6932

Search in DiVA

Show all publications