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Gustafsson, Jonas
Publications (10 of 23) Show all publications
Hamfelt, J., Gustafsson, J., van Deventer, J., Löfqvist, T., Häggström, F. & Delsing, J. (2016). A passive Barkhausen noise sensor for low-power applications (ed.). In: (Ed.), 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings: . Paper presented at International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016 (pp. 280-284). Piscataway, NJ: IEEE Communications Society, Article ID 7520374.
Open this publication in new window or tab >>A passive Barkhausen noise sensor for low-power applications
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2016 (English)In: 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, Piscataway, NJ: IEEE Communications Society, 2016, p. 280-284, article id 7520374Conference paper, Published paper (Refereed)
Abstract [en]

This paper proposes a passive Barkhausen noise sensor design suitable for low power applications. The sensor uses a permanent magnet and the relative motion between itself and a measured specimen instead of the conventional method that uses a fixed sensor and an alternating magnetic field. Since this novel design is passive, the sensor is well suited for low power applications and could potentially be used in e.g. A condition monitoring system integrated into a rolling element bearing. Proof of concept testing has been performed showing that the proposed sensor produces similar results as conventional Barkhausen noise sensors when applied to specimens being cyclically loaded until failure in a rotating bending rig. The results imply that material fatigue detection using the Barkhausen noise can be performed with the proposed sensor at a fraction of the energy cost compared to a conventional sensor. This warrants future research into the development of the proposed sensor, its advantages, disadvantages, and functionality

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2016
Series
I E E E Instrumentation and Measurement Technology Conference. Proceedings, ISSN 1091-5281
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-27126 (URN)10.1109/I2MTC.2016.7520374 (DOI)000382523600050 ()2-s2.0-84980398147 (Scopus ID)07898908-71e1-408f-9457-00c2f43688d4 (Local ID)9781467392204 (ISBN)07898908-71e1-408f-9457-00c2f43688d4 (Archive number)07898908-71e1-408f-9457-00c2f43688d4 (OAI)
Conference
International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016
Note

Validerad; 2016; Nivå 1; 2016-10-11 (andbra)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-09-06Bibliographically approved
Häggström, F., Gustafsson, J. & Delsing, J. (2016). Interleaved Switch Harvesting on Inductor: Non-linear extraction, action and reaction (ed.). In: (Ed.), 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings: . Paper presented at International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016 (pp. 642-647). Piscataway, NJ: IEEE Communications Society, Article ID 7520439.
Open this publication in new window or tab >>Interleaved Switch Harvesting on Inductor: Non-linear extraction, action and reaction
2016 (English)In: 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, Piscataway, NJ: IEEE Communications Society, 2016, p. 642-647, article id 7520439Conference paper, Published paper (Refereed)
Abstract [en]

The circuit presented in this paper provides increased transfer efficiency for the electric charge generated by a piezoelectric element to the storage device, it also enables a simplified active control circuitry required for switched harvesting solutions as the control transistors are referenced to ground. This is achieved by inverting the voltage potential across the piezoelectric element and thereby maintaining a higher voltage while extracting energy. The increased potential allows vibration harvesters to operate over a broader frequency range. For weakly coupled piezoelectric harvesters, the increased potential allows the electrical power output to be increased. In this paper, the circuit is simulated in SPICE using existing models of discrete components in conjunction with a model of a piezoelectric vibration harvester. The power output and mechanical behavior of the harvester using the presented circuit are compared to two existing technologies: Synchronous Switch Harvesting on Inductor (SSHI) and a full-wave rectifying bridge. The comparison demonstrates that the novel Interleaved Switch Harvesting on Inductor (ISHI) circuit outperforms state-of-the-art active harvesting solutions, e.g., SSHI, as a result of the decreased energy losses from diodes. In addition, the ISHI circuit requires fewer components than does the SSHI circuit and solves the floating transistor source issue that arises in SSHI implementations. To achieve the maximum power conversion efficiency, impedance matching is required, which can be achieved by controlling the voltage of the storage device

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2016
Series
I E E E Instrumentation and Measurement Technology Conference. Proceedings, ISSN 1091-5281
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-38164 (URN)10.1109/I2MTC.2016.7520439 (DOI)000382523600114 ()2-s2.0-84980383531 (Scopus ID)c7ab804b-e9e4-44c3-b234-cc3445dab6dd (Local ID)9781467392204 (ISBN)c7ab804b-e9e4-44c3-b234-cc3445dab6dd (Archive number)c7ab804b-e9e4-44c3-b234-cc3445dab6dd (OAI)
Conference
International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016
Note

Validerad; 2016; Nivå 1; 2016-10-11 (andbra)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-09-06Bibliographically approved
Häggström, F., Gustafsson, J. & Delsing, J. (2016). Piezoelectric energy harvesting modeled with SPICE (ed.). In: (Ed.), 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings: . Paper presented at International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016 (pp. 654-659). Piscataway, NJ: IEEE Communications Society, Article ID 7520441.
Open this publication in new window or tab >>Piezoelectric energy harvesting modeled with SPICE
2016 (English)In: 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, Piscataway, NJ: IEEE Communications Society, 2016, p. 654-659, article id 7520441Conference paper, Published paper (Refereed)
Abstract [en]

The generation of electricity from vibrations has attracted considerable attention over the past decade. For this purpose, a piezoelectric-type harvester tuned to resonate at a specific frequency is typically used. This paper proposes a SPICE model capable of modeling piezoelectric energy harvesters. The model is parametrized enabling simple introduction of relevant physical parameters. Underlying theory based on Euler-Bernoulli beam theory is presented and modeling simplifications are justified. The SPICE model is verified by comparison to examples for which analytical and experimental solutions has been published. The SPICE model is valid close to the analyzed mode center frequency and delivers results within 1% compared to experimental and analytical data. Furthermore, we also show that the harvester can be electrically tuned to match the excitation frequency. This makes it possible to maximize the power output for both linear and non-linear loads. The here presented model enables efficient analysis of harvester design and changes of harvesting conditions

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2016
Series
I E E E Instrumentation and Measurement Technology Conference. Proceedings, ISSN 1091-5281
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-33220 (URN)10.1109/I2MTC.2016.7520441 (DOI)000382523600116 ()84980325841 (Scopus ID)806226b2-1e59-4cf6-b6bb-bd7ed3366a3b (Local ID)9781467392204 (ISBN)806226b2-1e59-4cf6-b6bb-bd7ed3366a3b (Archive number)806226b2-1e59-4cf6-b6bb-bd7ed3366a3b (OAI)
Conference
International Instrumentation and Measurement Technology Conference : 23/05/2016 - 26/05/2016
Note

Validerad; 2016; Nivå 1; 2016-10-07 (andbra)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-09-06Bibliographically approved
Törngren, M., Edin Grimheden, M., Birk, W. & Gustafsson, J. (2016). Strategies and considerations in shaping cyber-physical systems education. ACM SIGBED Review, 14(1), 53-60
Open this publication in new window or tab >>Strategies and considerations in shaping cyber-physical systems education
2016 (English)In: ACM SIGBED Review, ISSN 1551-3688, Vol. 14, no 1, p. 53-60Article in journal (Refereed) Published
Abstract [en]

Embedded and Cyber-Physical Systems education faces several challenges as well as opportunities as every-"thing" becomes connected, and as technology development accelerates. Initiatives such as CDIO, as well as several other academic and industry initiatives to create new CPS programs illustrate strong interests and awareness of these challenges. We provide an overview of foreseen educational needs, existing state of the art in education and an analysis of the subject of CPS with the purpose of understanding the implications for education. The investigation points to key issues in curriculum design regarding balancing depth and breadth, theory and practices, academic and industrial needs, and core technical skills with complementary skills. Curricula in CPS could, if the right balance is achieved, educate CPS engineers of the future that are "ready to engineer". We conclude by synthesizing high level guidelines in terms of strategies and considerations for CPS curriculum development.

National Category
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics; Control Engineering
Identifiers
urn:nbn:se:ltu:diva-61630 (URN)10.1145/3036686.3036693 (DOI)
Available from: 2017-01-25 Created: 2017-01-25 Last updated: 2017-11-24Bibliographically approved
Gustafsson, J., Kyusakov, R., Mäkitaavola, H. & Delsing, J. (2014). Application of service oriented architecture for sensors and actuators in district heating substations (ed.). Sensors, 14(8), 15553-15572
Open this publication in new window or tab >>Application of service oriented architecture for sensors and actuators in district heating substations
2014 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 14, no 8, p. 15553-15572Article in journal (Refereed) Published
Abstract [en]

Hardwired sensor installations using proprietary protocols found in today’s district heating substations limit the potential usability of the sensors in and around the substations. If sensor resources can be shared and re-used in a variety of applications, the cost of sensors and installation can be reduced, and their functionality and operability can be increased. In this paper, we present a new concept of district heating substation control and monitoring, where a service oriented architecture (SOA) is deployed in a wireless sensor network (WSN), which is integrated with the substation. IP-networking is exclusively used from sensor to server; hence, no middleware is needed for Internet integration. Further, by enabling thousands of sensors with SOA capabilities, a System of Systems approach can be applied. The results of this paper show that it is possible to utilize SOA solutions with heavily resource-constrained embedded devices in contexts where the real-time constrains are limited, such as in a district heating substation.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-8947 (URN)10.3390/s140815553 (DOI)000341499900111 ()25196165 (PubMedID)2-s2.0-84939544923 (Scopus ID)780ca67d-d6c4-4fb3-9905-531fb76273e2 (Local ID)780ca67d-d6c4-4fb3-9905-531fb76273e2 (Archive number)780ca67d-d6c4-4fb3-9905-531fb76273e2 (OAI)
Note

Validerad; 2014; 20140903 (gusjon)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Delsing, J., Eliasson, J., Gustafsson, J., Kyusakov, R., Kruglyak, A., Mcload, S., . . . Mendes, J. M. (2014). Building System of Systems with SOA Technology: A Smart House Use Case (ed.). In: (Ed.), Armando W. Colombo (Ed.), Industrial Cloud-Based Cyber-Physical Systems: The IMC-AESOP Approach (pp. 219-230). Paper presented at . : Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>Building System of Systems with SOA Technology: A Smart House Use Case
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2014 (English)In: Industrial Cloud-Based Cyber-Physical Systems: The IMC-AESOP Approach, Encyclopedia of Global Archaeology/Springer Verlag, 2014, p. 219-230Chapter in book (Refereed)
Abstract [en]

The IMC-AESOP architecture has been used to implemente a smart house demonstration. Six different systems has been integrated with local (802.11, 802.15.4) and global (telecom) communication. The six systems integrated are: Car arrival detection system, Garage door opening system, House security system, External house lightning system, External electrical outlet system, House energy control system. The SOA technologies used are CoAP and EXI using SenML to encode the services. Engineering tools have been used to simulate the usage scenario and provide prediction of system behaviour.

Place, publisher, year, edition, pages
Encyclopedia of Global Archaeology/Springer Verlag, 2014
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Embedded Systems
Research subject
Industrial Electronics; Embedded System
Identifiers
urn:nbn:se:ltu:diva-21310 (URN)10.1007/978-3-319-05624-1_10 (DOI)2-s2.0-84930702071 (Scopus ID)d4fda001-4f2e-42f2-9a61-a24bd93b9a16 (Local ID)978-3-319-05623-4 (ISBN)978-3-319-05624-1 (ISBN)d4fda001-4f2e-42f2-9a61-a24bd93b9a16 (Archive number)d4fda001-4f2e-42f2-9a61-a24bd93b9a16 (OAI)
Note
Godkänd; 2014; 20140520 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Häggström, F., Gustafsson, J. & Delsing, J. (2014). Energy harvesting technologies for wireless sensors in rotating environments (ed.). In: (Ed.), Proceedings of 2014 IEEE 19th International Conference on Emerging Technologies & Factory Automation (ETFA 2014): Barcelona, Spain, 16-19 Sept. 2014. Paper presented at International Conference on Emerging Technologies & Factory Automation : 16/09/2014 - 19/09/2014. Piscataway, NJ: IEEE Communications Society, Article ID 7005364.
Open this publication in new window or tab >>Energy harvesting technologies for wireless sensors in rotating environments
2014 (English)In: Proceedings of 2014 IEEE 19th International Conference on Emerging Technologies & Factory Automation (ETFA 2014): Barcelona, Spain, 16-19 Sept. 2014, Piscataway, NJ: IEEE Communications Society, 2014, article id 7005364Conference paper, Published paper (Refereed)
Abstract [en]

Using sensors to measure parameters of interest in rotating environments and communicating the measurements in real-time over wireless links, requires a reliable power source. In this paper, we have investigated the possibility to generate electric power locally by evaluating six different energy-harvesting technologies. The applicability of the technology is evaluated by several parameters that are important to the functionality in an industrial environment. All technologies are individually presented and evaluated, a concluding table is also summarizing the technologies strengths and weaknesses. To support the technology evaluation on a more theoretical level, simulations has been performed to strengthen our claims. Among the evaluated and simulated technologies, we found that the variable reluctancebased harvesting technology is the strongest candidate for further technology development for the considered use-case.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2014
Series
IEEE Emerging Technology and Factory Automation (ETFA)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-30362 (URN)10.1109/ETFA.2014.7005364 (DOI)000360999100315 ()2-s2.0-84946686221 (Scopus ID)423f5291-5a99-418b-b2d3-6479e11fdd6e (Local ID)978-1-4799-4845-1 (ISBN)423f5291-5a99-418b-b2d3-6479e11fdd6e (Archive number)423f5291-5a99-418b-b2d3-6479e11fdd6e (OAI)
Conference
International Conference on Emerging Technologies & Factory Automation : 16/09/2014 - 19/09/2014
Projects
Arrowhead
Note

Validerad; 2015; Nivå 1; 20140904 (gusjon)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-09-06Bibliographically approved
Sandin, F., Gustafsson, J. & Delsing, J. (2013). Fault detection with hourly district energy data: Probabilistic methods and heuristics for automated detection and ranking of anomalies (ed.). Paper presented at . Stockholm: Svensk Fjärrvärme
Open this publication in new window or tab >>Fault detection with hourly district energy data: Probabilistic methods and heuristics for automated detection and ranking of anomalies
2013 (English)Report (Other academic)
Abstract [en]

This project is motivated by the difficulties experienced by district energy utilities to detect faults in large-scale district energy systems. Faults that remain undetected can be costly and the industry loose credibility when customers detect faults and receive incorrect bills. Faults are common in district energy systems due to the high number of substations and instrumentation components. Also, the standard energy-metering instrumentation is designed for low cost and billing, not for automated fault detection. Large variations in building dynamics, building subsystems, human behaviour and the environment make the system complex to model and analyse. Therefore, conventional methods for fault detection are not applicable and the use of ad hoc methods for fault detection often result in numerous false alarms that are costly to analyse and manage. There is a growing interest among the utilities to develop services and functions that are based on data with high temporal resolution. Energy metering regulations are also expected to become more demanding in the future, which drives technology standards towards high-resolution data. This trend results in high rates of streaming data at the management level, which is more challenging to validate. Therefore, more efficient methods for fault detection are needed.This project deals with probabilistic methods for automated anomaly detection that are useful for the identification of faults in large-scale district energy systems. These methods are compatible with the information that is available in modern energy meter data management systems. We focus on methods and heuristics that can be applied automatically with a minimum of human assistance to enable cost-efficient analysis of data. With these methods, operators do not have to rely on ad hoc tests or manual inspection of graphs to detect anomalies in the data. Instead, operators can focus on the analysis of a subset of substations that are identified as abnormal. Intraday and intraweek variations in the thermal load are accounted for by automatically grouping hours of the week with similar thermal load characteristics. Alternatively, intraweek cycles can be accounted for by grouping days of the week with similar characteristics. Robust regression is used to model variable relationships with historical data. A robust outlier detection method is used to determine if variables deviate from the expectation defined by a regression model. Robust statistical methods are used to score outliers, so that outstanding substations can be identified automatically with a ranking procedure. The regression models can also be used for imputation of missing energy metering data, which is a common problem that is not always solved in an accurate way. We also present methods for the detection of long-term drift, which can be costly and otherwise difficult to detect, and the detection of poor precision in measurement data, which for example can result from oversized flow valves, misconfiguration and noise. In addition to fault detection, the proposed methods can be useful also for maintenance scheduling because substations that behave in a way that is consistent with the historical record can be given a lower maintenance priority compared to substations with abnormal behaviour.The proposed methods are studied using hourly data from a population of about one thousand district heating substations. Sample code of key functions is provided. We find that substations with documented faults, unknown faults and abnormal characteristics can be identified in about 5% of the substations. The lack of a well-defined dataset makes the development and evaluation of methods for fault detection challenging, and the fact that historical energy metering data includes abnormal data is often ignored in the literature. The proposed methods need to be implemented in a full-scale district energy management system under the supervision of experienced operators before the effects on the fault detection rate and cost efficiency can be properly evaluated. However, we are convinced that the proposed algorithms can be implemented in present data management systems and that they offer significant advantages over the methods that are commonly used today.

Place, publisher, year, edition, pages
Stockholm: Svensk Fjärrvärme, 2013. p. 120
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-22021 (URN)12f0f9e8-d223-4442-88f8-f3c1af26f95d (Local ID)978-91-7381-125-5 (ISBN)12f0f9e8-d223-4442-88f8-f3c1af26f95d (Archive number)12f0f9e8-d223-4442-88f8-f3c1af26f95d (OAI)
Note
Godkänd; 2013; 20131009 (fresan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-04Bibliographically approved
Kyusakov, R., Eliasson, J., Delsing, J., van Deventer, J. & Gustafsson, J. (2013). Integration of wireless sensor and actuator nodes with IT infrastructure using service-oriented architecture (ed.). IEEE Transactions on Industrial Informatics, 9(1), 43-51
Open this publication in new window or tab >>Integration of wireless sensor and actuator nodes with IT infrastructure using service-oriented architecture
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2013 (English)In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 9, no 1, p. 43-51Article in journal (Refereed) Published
Abstract [en]

A large number of potential applications for Wireless Sensor and Actuator Networks (WSAN) have yet to be embraced by industry despite high interest amongst academic researchers. This is due to various factors such as unpredictable costs related to development, deployment and maintenance of WSAN, especially when integration with existing IT infrastructure and legacy systems is needed. Service-Oriented Architecture (SOA) is seen as a promising technique to bridge the gap between sensor nodes and enterprise applications such as factory monitoring, control and tracking systems where sensor data is used. To date, research efforts have focused on middleware software systems located in gateway devices that implement standard service technology, such as Devices Profile for Web Services (DPWS), for interacting with the sensor network. This paper takes a different approach - deploying interoperable Simple Object Access Protocol (SOAP)-based web services directly on the nodes and not using gateways. This strategy provides for easy integration with legacy IT systems and supports heterogeneity at the lowest level. Two-fold analysis of the related overhead, which is the main challenge of this solution, is performed; Quantification of resource consumption as well as techniques to mitigate it are presented, along with latency measurements showing the impact of different parts of the system on system performance. A proof-of-concept application using Mulle - a resource-constrained sensor platform - is also presented.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-15228 (URN)10.1109/TII.2012.2198655 (DOI)000312839600004 ()2-s2.0-84871779922 (Scopus ID)eb96f73b-ed3c-404f-98a6-c913665495eb (Local ID)eb96f73b-ed3c-404f-98a6-c913665495eb (Archive number)eb96f73b-ed3c-404f-98a6-c913665495eb (OAI)
Projects
Architecture for Service-Oriented Process – Monitoring and Control
Note

Validerad; 2013; 20120124 (rumkyu)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sandin, F., Gustafsson, J., Delsing, J. & Eklund, R. (2012). Basic methods for automated fault detection and energy data validation in existing district heating systems (ed.). In: (Ed.), (Ed.), 13th international symposium on district heating and cooling: 3rd of September - 4th of September Copenhagen, Denmark. Paper presented at International Symposium on District Heating and Cooling : 03/09/2012 - 04/09/2012. : District Energy Development Center
Open this publication in new window or tab >>Basic methods for automated fault detection and energy data validation in existing district heating systems
2012 (English)In: 13th international symposium on district heating and cooling: 3rd of September - 4th of September Copenhagen, Denmark, District Energy Development Center , 2012Conference paper, Published paper (Refereed)
Abstract [en]

Fault detection and diagnostics (FDD) of district heating substations (DHS) are important activities because malfunctioning components can lead to incorrect billing and waste of energy. Although FDD has been an activate research area for nearly two decades, only a few simple tools are commonly deployed in the district energy industry. Some of the methods proposed in the literature are promising, but their complexity may prevent broader application. Other methods require sensor data that are not commonly available, or cannot be expected to function well in practice due to oversimplification. Here we present two basic methods for improved FDD and data validation that are compatible with the data acquisition systems that are commonly used today. We propose that correlation analysis can be used to identify substations with similar supply temperatures and that the corresponding temperature difference is a useful quantity for FDD. The second method is a limit- checking approach for the validation of thermal power usage, which is sensitive to faults affecting both the primary flow and temperature sensors in a DHS. These methods are suitable for automated FDD and are demonstrated with hourly data provided by a Swedish district energy company.

Place, publisher, year, edition, pages
District Energy Development Center, 2012
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-40519 (URN)faf6dde5-5fbf-4283-9885-7d30e7c107af (Local ID)faf6dde5-5fbf-4283-9885-7d30e7c107af (Archive number)faf6dde5-5fbf-4283-9885-7d30e7c107af (OAI)
Conference
International Symposium on District Heating and Cooling : 03/09/2012 - 04/09/2012
Note
Godkänd; 2012; 20121122 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-05-04Bibliographically approved
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