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Kyprianidis, KonstantinosORCID iD iconorcid.org/0000-0002-8466-356X
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Publications (10 of 84) Show all publications
Zimmerman, N., Kyprianidis, K. & Lindberg, C.-F. (2019). Achieving lower district heating network temperatures using feed-forward MPC. Materials, 12(15), Article ID 2465.
Open this publication in new window or tab >>Achieving lower district heating network temperatures using feed-forward MPC
2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 15, article id 2465Article in journal (Refereed) Published
Abstract [en]

The focus of this work is to present the feasibility of lowering the supply and return temperatures of district heating networks in order to achieve energy savings through the implementation of feed-forward model predictive control. The current level of district heating technology dictates a need for higher supply temperatures, which is not the case when considering the future outlook. In part, this can be attributed to the fact that current networks are being controlled by operator experience and outdoor temperatures. The prospects of reducing network temperatures can be evaluated by developing a dynamic model of the process which can then be used for control purposes. Two scenarios are presented in this work, to not only evaluate a controller's performance in supplying lower network temperatures, but to also assess the boundaries of the return temperature. In Scenario 1, the historical load is used as a feed-forward signal to the controller, and in Scenario 2, a load prediction model is used as the feed-forward signal. The findings for both scenarios suggest that the new control approach can lead to a load reduction of 12.5% and 13.7% respectively for the heat being supplied to the network. With the inclusion of predictions with increased accuracy on end-user demand and feed-back, the return temperature values can be better sustained, and can lead to a decrease in supply temperatures and an increase in energy savings on the production side.

Place, publisher, year, edition, pages
MDPI AG, 2019
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-45030 (URN)10.3390/ma12152465 (DOI)000482576900126 ()31382435 (PubMedID)2-s2.0-85070601468 (Scopus ID)
Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-10-14Bibliographically approved
Rahman, M., Avelin, A. & Kyprianidis, K. (2019). An Approach for Feedforward Model Predictive Control of Continuous Pulp Digesters. Processes, 7(9), 602-622
Open this publication in new window or tab >>An Approach for Feedforward Model Predictive Control of Continuous Pulp Digesters
2019 (English)In: Processes, ISSN 2227 9717, Vol. 7, no 9, p. 602-622Article in journal (Refereed) Published
Abstract [en]

Kappa number variability at the continuous digester outlet is a major concern for pulp and paper mills. It is evident that the aforementioned variability is strongly linked to the feedstock wood properties, particularly lignin content. Online measurement of lignin content utilizing near-infrared spectroscopy at the inlet of the digester is paving the way for tighter control of the blow-line Kappa number. In this paper, an innovative approach of feedforwarding the lignin content to a model predictive controller was investigated with the help of modeling and simulation studies. For this purpose, a physics-based modeling library for continuous pulp digesters was developed and validated. Finally, model predictive control approaches with and without feedforwarding the lignin measurement were evaluated against current industrial control and proportional-integral-derivative (PID) schemes. 

Keywords
pulp and paper; Kappa number; pulp digester; modeling; feedforward; predictive control
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-45217 (URN)10.3390/pr7090602 (DOI)2-s2.0-85072222936 (Scopus ID)
Projects
FUDIPO
Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2019-09-26Bibliographically approved
Salman, C. A., Dahlquist, E., Thorin, E., Kyprianidis, K. & Avelin, A. (2019). Future directions for CHP plants using biomass and waste - Adding production of vehicle fuels. In: E3S Web of Conferences: . Paper presented at 2019 SUstainable PolyEnergy Generation and HaRvesting, SUPEHR 2019, 4 September 2019 through 6 September 2019. EDP Sciences, Article ID 01006.
Open this publication in new window or tab >>Future directions for CHP plants using biomass and waste - Adding production of vehicle fuels
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2019 (English)In: E3S Web of Conferences, EDP Sciences , 2019, article id 01006Conference paper, Published paper (Refereed)
Abstract [en]

In Northern Europe, the production of many biobased CHP plants is getting affected due to the enormous expansion of wind and solar power. In addition, heat demand varies throughout the year, and existing CHP plants show less technical performance and suffer economically. By integrating the existing CHP plants with other processes for the production of chemicals, they can be operated more hours, provide operational and production flexibility and thus increase efficiency and profitability. In this paper, we look at a possible solution by converting an existing CHP plant into integrated biorefinery by retrofitting pyrolysis and gasification process. Pyrolysis is retrofitted in an existed CHP plant. Bio-oil obtained from pyrolysis is upgraded to vehicle grade biofuels. Gasification process located upfront of CHP plant provides the hydrogen required for upgradation of biofuel. The results show that a pyrolysis plant with 18 ton/h feed handling capacity (90 MWth), when integrated with gasification for hydrogen requirement and CHP plant for heat can produce 5.2 ton/h of gasoline/diesel grade biofuels. The system integration gives positive economic benefits too but the annual operating hours can impact economic performance. 

Place, publisher, year, edition, pages
EDP Sciences, 2019
National Category
Energy Systems
Identifiers
urn:nbn:se:mdh:diva-45259 (URN)10.1051/e3sconf/201911301006 (DOI)2-s2.0-85071879296 (Scopus ID)
Conference
2019 SUstainable PolyEnergy Generation and HaRvesting, SUPEHR 2019, 4 September 2019 through 6 September 2019
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved
Kyprianidis, K. (2019). On Gas Turbine Conceptual Design. (Doctoral dissertation). Cranfield, United Kingdom: Cranfield University
Open this publication in new window or tab >>On Gas Turbine Conceptual Design
2019 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

The thesis begins with a review of the evolution of the industry's vision for the aero-engine design of the future. Appropriate research questions are set that can influence how this vision may further evolve in the years to come. Design constraints, material technology, customer requirements, noise and emissions legislation, technology risk and economic considerations and their effect on optimal concept selection are discussed in detail. Different aspects of the pedagogy of gas turbine conceptual design as well as information on the Swedish and Brazilian educational systems are also presented.

A multi-disciplinary aero-engine conceptual design tool is utilised for assessing engine/aircraft environmental performance. The tool considers a variety of disciplines that span conceptual design including: engine performance, engine aerodynamic and mechanical design, aircraft design and performance, emissions prediction and environmental impact, engine and airframe noise, and production, maintenance and direct operating costs.

With respect to addressing the research questions set, several novel engine cycles and technologies - currently under research - are identified. It is shown that there is great potential to reduce fuel consumption for the different concepts identified, and consequently decrease the CO2 emissions. Furthermore, this can be achieved with sufficient margin from the NOx certification limits set by International Civil Aviation Organisation, and in line with the medium-term and long-term goals set through it's Committee on Aviation Environmental Protection.

The option of an intercooled-core geared-fan aero-engine for long-haul applications is assessed by means of a detailed design space exploration. An attempt is made to identify the fuel burn optimal values for a set of engine design parameters by varying them all simultaneously, as well as in isolation. Different fuel optimal designs are developed based on different sets of assumptions. Evidence is provided that higher overall pressure ratio intercooled engine cycles become more attractive in aircraft applications that require larger engine sizes.

The trade-off between the ever-increasing energy efficiency of modern aero-engines and their NOx performance is assessed. Improving engine thermal efficiency has a detrimental effect on NOx emissions for traditional combustors, both at high altitude and particularly at sea-level conditions. Lean-combustion technology does not demonstrate such behaviour and can therefore help decouple NOx emissions performance from engine thermal efficiency. If we are to reduce the contribution of aviation to global warming, however, future certification legislation may need to become more stringent and comprehensive, i.e., cover high altitude conditions. By doing so we can help unlock the competitive advantage of lean burn technology in relation to cruise NOx and mission performance.

Finally, some insight is provided on the potential benefits to be tapped from a transition from the traditional deterministic approach for system analysis to a stochastic (robust design) approach for economic decision-making under uncertainty. A basic methodology is outlined and applied on a specific conceptual design case for a conventional turbofan engine. The sensitivity of an optimal engine design obtained deterministically to real-life uncertainties is found to be far from negligible. The considerable impact of production scatter, measurement uncertainties as well as component performance deterioration, on engine performance must be catered for; this includes taking into consideration control system design aspects. A fast analytical approach is shown to be sufficiently accurate for the conceptual design process, particularly for estimating key performance parameters. These relate to type-test certication and performance retention guarantees including preliminary estimates of engine production margins.

Lessons learned are presented from: (i) the integration of different elements of conceptual design in a new BSc course and an existing traditional MSc course on gas turbine technology, (ii) the development of an intensive course on gas turbine multi-disciplinary conceptual design. The results from the use of problem-based learning are very encouraging, in terms of enhancing student learning and developing engineering skills.

Place, publisher, year, edition, pages
Cranfield, United Kingdom: Cranfield University, 2019. p. 198
National Category
Aerospace Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-43170 (URN)
Public defence
, Cranfield (English)
Opponent
Supervisors
Available from: 2019-04-23 Created: 2019-04-21 Last updated: 2019-10-01Bibliographically approved
Sahoo, S., Xin, Z., Kyprianidis, K. & Kallfas, A. (2019). PERFORMANCE ASSESSMENT OF AN INTEGRATED PARALLEL HYBRID-ELECTRIC PROPULSION SYSTEM AIRCRAFT. In: : . Paper presented at Turbo Expo 2019 Turbomachinery Technical Conference & Exposition, Phoenix Convention Center, June 17-21, 2019, Phoenix, Arizona, USA. Phoenix, AZ, USA: ASME Press
Open this publication in new window or tab >>PERFORMANCE ASSESSMENT OF AN INTEGRATED PARALLEL HYBRID-ELECTRIC PROPULSION SYSTEM AIRCRAFT
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Hybrid-electric propulsion system promises avenues for a greener aviation sector. Ground research work was performed in the past for the feasibility assessment, at the system level, for such novel concepts and the results showed were promising. Such designs, however, possess unique challenges from an operational point of view, and for sizing of the sub-system components; necessitating further design space exploration for associating with an optimal operational strategy. In light of the above, the paper aims at presenting an operational analysis and performance assessment study, for a conceptualised parallel hybrid design of an advanced geared turbofan engine, based on 2035 timeframe technology level. It is identified that the hybrid power operation of the engine is constrained with respect to the requirement of maintaining an adequate surge margin for the low pressure side components; however, a core re-optimised engine design with consideration of electrical power add-in for the design condition, relieves such limit. Therefore such a design, makes it suitable for implementation of higher degree of hybridisation. Furthermore, performance assessment is made both at engine and engine-aircraft integrated level for both scenarios of hybrid operation and the benefits are established relative to the baseline engine. The performance at engine level engine specific fuel consumption (SFC), thrust specific power consumption (TSPC), and overall efficiency, shows improvement in both hybridised scenarios. Improvement in SFC is achieved due to supply of the electrical power, whereas, the boost in TSPC, and overall efficiency is attributed to the use of higher efficiency electrical drive system. Furthermore, it is observed that while the hybridised scenario performs better at engine level, the core re-optimised design exhibits a better saving for block fuel/energy consumption, due to the considerable weight savings in the core components.

Place, publisher, year, edition, pages
Phoenix, AZ, USA: ASME Press, 2019. p. 16
Keywords
Hybrid Electric, Geared Turbofan, Performance
National Category
Engineering and Technology Energy Systems
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-45441 (URN)
Conference
Turbo Expo 2019 Turbomachinery Technical Conference & Exposition, Phoenix Convention Center, June 17-21, 2019, Phoenix, Arizona, USA
Projects
TRADE
Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-10Bibliographically approved
Hosain, M. L., Domínguez, J. M., Bel Fdhila, R. & Kyprianidis, K. (2019). Smoothed particle hydrodynamics modeling of industrial processes involving heat transfer. Applied Energy, 252, Article ID 113441.
Open this publication in new window or tab >>Smoothed particle hydrodynamics modeling of industrial processes involving heat transfer
2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 252, article id 113441Article in journal (Refereed) Published
Abstract [en]

Smoothed Particle Hydrodynamics (SPH) is a mesh-free particle method that has been widely used over the past decade to model complex flows. The method has mainly been used to investigate problems related to hydrodynamics and maritime engineering, in which heat transfer does not play a key role. In this article, the heat-conduction equation is implemented in the open-source code DualSPHysics, based on the SPH technique, and applied to different study cases, including conduction in still water in a cavity, laminar water flow between two infinite parallel plates and tube bank heat exchanger. The thermal solutions obtained from SPH are benchmarked with the solutions from Finite Volume Method (FVM) and validated using available analytical solutions. DualSPHysics results are in good agreement with FVM and analytical models, and demonstrate the potential of the meshless approach for industrial applications involving heat transfer.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
CFD analysis, DualSPHysics, Finite Volume Method, Smoothed Particle Hydrodynamics, Transient heat transfer
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-44869 (URN)10.1016/j.apenergy.2019.113441 (DOI)2-s2.0-85067552454 (Scopus ID)
Note

Export Date: 11 July 2019; Article; CODEN: APEND; Correspondence Address: Hosain, M.L.; Mälardalen University, School of Business, Society & Engineering, P.O. Box 883, Sweden; email: md.lokman.hosain@mdh.se

Available from: 2019-07-11 Created: 2019-07-11 Last updated: 2019-07-11Bibliographically approved
Hermansson, K., Kos, C., Starfelt, F., Kyprianidis, K., Lindberg, C.-F. & Zimmerman, N. (2018). An Automated Approach to Building and Simulating Dynamic District Heating Networks. IFAC-PapersOnLine, 51(2), 855-860
Open this publication in new window or tab >>An Automated Approach to Building and Simulating Dynamic District Heating Networks
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2018 (English)In: IFAC-PapersOnLine, ISSN 2405-8963, Vol. 51, no 2, p. 855-860Article in journal (Refereed) Published
Abstract [en]

In Nordic countries, district heating accounts for a large share of the consumers’  heat demand. In Sweden, roughly 50% of the total heat demand is attributed to district heating. Which, over the past few years, is equivalent to around 50 TWh, and imposes a difficult balance between supply and demand for the suppliers of district heating. For large networks the propagation of heat from supplier to end-user can vary several hours. Further complexities of large networks, which can consist of multiple overlapping rings, is that during transient conditions the flow can actually change direction. A dynamic modeling library has been developed in Modelica using OpenModelica for district heating networks. Methods for modeling, handling data, simulating and the visualization of results has been developed using Matlab. The model has been validated using data from Mälarenergi  AB, a local provider of district heating in Västerås, Sweden. The model provides to an acceptable degree in predicting the heat propagation and temperature distribution in a localized case study. Adding a higher level of robustness, the model has the capacity to handle bi-directional and reversing flows in complex ring structures. Through this work, the combination of OpenModelica and Matlab, a framework for automating the building and simulation of district heating networks is obtainable. The implications of automating network modeling from computer-aided design drawings allows for a quick robust overview of how the network is working and how prospective additions to the network could impact the end-users. Furthermore, incorporating visual aspects for heat propagation in a network contributes to a higher understanding of complex network structures. 

Place, publisher, year, edition, pages
Elsevier B.V., 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-39303 (URN)10.1016/j.ifacol.2018.04.021 (DOI)000435693000146 ()2-s2.0-85046689930 (Scopus ID)
Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-07-12Bibliographically approved
Goldberg, C., Nalianda, D., Sethi, V., Pilidis, P., Singh, R. & Kyprianidis, K. (2018). Assessment of an energy-efficient aircraft concept from a techno-economic perspective. Applied Energy, 221, 229-238
Open this publication in new window or tab >>Assessment of an energy-efficient aircraft concept from a techno-economic perspective
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 221, p. 229-238Article in journal (Refereed) Published
Abstract [en]

An increase in environmental awareness in both the aviation industry and the wider global setting has led to large bodies of research dedicated to developing more sustainable technology with a lower environmental impact and lower energy usage. The goal of reducing environmental impact has necessitated research into revolutionary new technologies that have the potential to be significantly more energy efficient than their predecessors. However, for innovative technologies in any industry, there is a risk that adoption will be prohibitively expensive for commercial application. It is therefore important to model the economic factors of the new technology or policy at an early stage of development. This research demonstrates the application of a Techno-economic Environmental Risk Assessment framework that may be used to identify the economic impact of an energy-efficient aircraft concept and the impact that environmental policy would have on the viability of the concept. The framework has been applied to a case study aircraft designed to achieve an energy saving of 60% in comparison to a baseline 2005 entry-into-service aircraft. The model compares the green aircraft concept to a baseline conventional aircraft using a sensitivity analysis of the aircraft direct operating cost to changes in acquisition and maintenance cost. The research illustrates an economically viable region for the technology. Cost margins are identified where the increase in operating cost due to expensive novel technology is counterbalanced by the reduction in cost resulting from low energy consumption. Viability was found to be closely linked to fuel price, with a low fuel price limiting the viability of energy-efficient aviation technology. In contrast, a change in environmental taxation policy was found to be beneficial, with the introduction of carbon taxation incentivising the use of an environmentally optimised aircraft.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-39030 (URN)10.1016/j.apenergy.2018.03.163 (DOI)000433269000020 ()2-s2.0-85044976512 (Scopus ID)
Available from: 2018-04-18 Created: 2018-04-18 Last updated: 2018-06-21Bibliographically approved
Roberto Caetano, N., Schmitz Venturini, M., Roman Centeno, F., Katiuscia Lemmertz, C. & Kyprianidis, K. (2018). Assessment of mathematical models for prediction of thermal radiation heat loss from laminar and turbulent jet non-premixed flames. Thermal Science and Engineering Progress, 7, 241-247
Open this publication in new window or tab >>Assessment of mathematical models for prediction of thermal radiation heat loss from laminar and turbulent jet non-premixed flames
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2018 (English)In: Thermal Science and Engineering Progress, ISSN 2451-9049, Vol. 7, p. 241-247Article in journal (Refereed) Published
Abstract [en]

Radiation plays an important role in several processes, being of particular interest to energy efficiency and safety of staff and facilities, mainly in the aerospace industry. In this context, along the last years mathematical models have been developed and reported in the literature aiming to obtain reliable predictions of thermal radiation in combustion applications. Some simplified models consider that thermal radiation emmited by a flame is mainly governed by the flame temperature, while other ones also account for the contribution of the combustion products. On the other hand, more detailed models include both flame geometry and composition. Many efforts have been made by several scientists in order to develop these models, however, there is no validation applied in different operating conditions found in the literature. Thus, the novelty brought by this work consists in an assessment on the comparison between the experimental data of thermal radiation emitted by jet non-premixed flames and the results obtained by calculations applying these models on several flame conditions, encompassing a wide range of applications: laminar and turbulent flames, buoyancy and momentum-driven flames, low-carbon and high-carbon fuels. Such assessments are important to assist combustion system designers on selecting the most adequate thermal radiation model during the project of a combustion system or process. The results found in the current investigation pointed out to a good agreement between experimental data and predictions obtained by detailed models, which consider flame geometry and radiative properties. On the other hand, simplified models must be avoided if accurate predictions of radiation are being sought, despite this, they can be employed as engineering tools for risk analysis, once, in general, they provided higher predictions when compared to the experiments, resulting in a safety factor to engineers and designers.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-40261 (URN)10.1016/j.tsep.2018.06.008 (DOI)2-s2.0-85049572613 (Scopus ID)
Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2018-07-19Bibliographically approved
Rahman, M., Zaccaria, V., Xin, Z. & Kyprianidis, K. (2018). Diagnostics-Oriented Modelling of Micro Gas Turbines for Fleet Monitoring and Maintenance Optimization. Processes, 6(11)
Open this publication in new window or tab >>Diagnostics-Oriented Modelling of Micro Gas Turbines for Fleet Monitoring and Maintenance Optimization
2018 (English)In: Processes, ISSN 2227-9717, Vol. 6, no 11Article in journal (Refereed) Published
Abstract [en]

The market for the small-scale micro gas turbine is expected to grow rapidly in the coming years. Especially, utilization of commercial off-the-shelf components is rapidly reducing the cost of ownership and maintenance, which is paving the way for vast adoption of such units. However, to meet the high-reliability requirements of power generators, there is an acute need of a real-time monitoring system that will be able to detect faults and performance degradation, and thus allow preventive maintenance of these units to decrease downtime. In this paper, a micro gas turbine based combined heat and power system is modelled and used for development of physics-based diagnostic approaches. Different diagnostic schemes for performance monitoring of micro gas turbines are investigated.

Keywords
micro gas turbine; modelling; diagnostics, gas path analysis, analysis by synthesis
National Category
Energy Systems
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-41514 (URN)10.3390/pr6110216 (DOI)000451530400012 ()2-s2.0-85057867402 (Scopus ID)
Projects
FUDIPO
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-10-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8466-356X

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