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Laumert, Björn
Publications (10 of 28) Show all publications
Benmakhlouf, Y., Guédez, R., Wallmander, J. & Laumert, B. (2019). A methodology to assess the market potential and identify most promising business cases for small scale CSP plants with thermal energy storage. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 130001.
Open this publication in new window or tab >>A methodology to assess the market potential and identify most promising business cases for small scale CSP plants with thermal energy storage
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 130001Conference paper, Published paper (Refereed)
Abstract [en]

This study presents a methodology to quantify the market potential for a novel distributed CSP technology with thermal energy technology. The system in question relies on the Stirling engine for power production, which is fed by heat collected from a heliostat field and stored in an integrated latent heat storage unit. Selected countries in the MENA region are investigated to identify best prospective business cases for such a technology. With a global market potential above 40 GW in the whole MENA, industrial sectors such as mining and cement hold the best prospects in terms of market share. The achievable costs of generation vary depending on the DNI of the sites considered but prove to be lower compared with conventional distributed generation (diesel gensets or PV-BEES). However, several countries in the MENA, although having high DNI resource, still offer low electricity utility prices to industrial customers for distributed CSP to become competitive with on-grid electricity procurement. A scenario analysis coupled with a multi criteria selection of the optimal business case quantifies the amount of subsidies necessary to reach competitiveness.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-262565 (URN)10.1063/1.5117643 (DOI)2-s2.0-85070646541 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Ayele, G. T., Mabrouk, M. T., Haurant, P., Laumert, B., Lacarrière, B. & Santarelli, M. (2019). Exergy analysis and thermo-economic optimization of a district heating network with solar- photovoltaic and heat pumps. In: Wojciech Stanek, Paweł Gładysz, Sebastian Werle, Wojciech Adamczyk (Ed.), Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems: . Paper presented at ECOS2019: 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.
Open this publication in new window or tab >>Exergy analysis and thermo-economic optimization of a district heating network with solar- photovoltaic and heat pumps
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2019 (English)In: Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems / [ed] Wojciech Stanek, Paweł Gładysz, Sebastian Werle, Wojciech Adamczyk, 2019Conference paper, Published paper (Refereed)
Abstract [en]

Electrification of district heating networks, especially using heat pumps, is widely recommended in literature. Installing heat pumps affects both electricity and heating networks. Due to lack of suitable modelling tools, size optimization of heat pumps in the heating network with the full consideration of the electric distribution network is not well addressed in literature. This paper presents an optimization of a district heating network consisting of solar photovoltaic and heat pumps with the consideration of the detail parameters of heating and electric distribution networks. An extended energy hub approach is used to model the energy system. Exergy and energy analyses are applied to identify and isolate lossy branches in a meshed heating network. Both methods resulted into the same reduced topology. Particle swarm optimization is then applied on the reduced topology in order to find out the most economical temperature profiles and size of distributed heat pumps. The thermo-economic results are found to be highly influenced by the heat demand distribution, the power loss in both electric and heat distribution network, the cost of generation, the temperature limits and the coupling effect of the heat pumps.

Keywords
electrification of district heating network, energy hub, exergy, multi-carrier energy systems, particle swarm optimization, thermo-economic optimization
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-261179 (URN)978-83-61506-51-5 (ISBN)
Conference
ECOS2019: 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02
Garrido, J., Aichmayer, L., Abou-Taouk, A. & Laumert, B. (2019). Experimental and numerical performance analyses of Dish-Stirling cavity receivers: Radiative property study and design. Energy, 169, 478-488
Open this publication in new window or tab >>Experimental and numerical performance analyses of Dish-Stirling cavity receivers: Radiative property study and design
2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 169, p. 478-488Article in journal (Refereed) Published
Abstract [en]

The solar receiver performance has a direct impact on the CSP power plant performance and, thereby, its levelized cost of electricity. Improved receiver designs supported by new advanced numerical tools and experimental validation campaigns directly help to make CSP technology more competitive. This paper presents an experimental and numerical investigation of the influence of the cavity receiver radiative properties and the thermal power input on the Dish-Stirling performance. Three cavity coatings are experimentally investigated: the original cavity material (Fiberfrax 140), Pyromark 2500 and Pyro-paint 634-ZO. Moreover, simulations validated with the experimental measurements are utilized to define a higher performance cavity receiver for the Eurodish system. The results indicate that the absorptivity of the cavity should be as low as possible to increase the receiver efficiency whereas the optimum emissivity depends on the operating temperatures. If the cavity temperature is lower than the absorber temperature, low emissivities are recommended and vice-versa. All material/coatings analyzed for the cavity provide similar receiver efficiencies, being Fiberfrax 140 slightly more efficient. Finally, a total receiver efficiency of 91.5% is reached by the proposed Eurodish cavity receiver when operating under the most favorable external conditions. 

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Solar simulator, Experimental measurements, Coatings, System modelling, Receiver design
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-247838 (URN)10.1016/j.energy.2018.12.033 (DOI)000459528500038 ()2-s2.0-85058468339 (Scopus ID)
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-04Bibliographically approved
Trevisan, S., Guédez, R., Bouzekri, H. & Laumert, B. (2019). Initial design of a radial-flow high temperature thermal energy storage concept for air-driven CSP systems. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 200031.
Open this publication in new window or tab >>Initial design of a radial-flow high temperature thermal energy storage concept for air-driven CSP systems
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 200031Conference paper, Published paper (Refereed)
Abstract [en]

The present work deals with the initial design and performance evaluation of a novel thermal energy storage concept consisting of a packed bed of rocks with a radial gas flow, suitable for the a generation of air-driven concentrating solar power plants. In doing so, this article also presents a state of the art of most promising packed bed concepts, highlighting their advantages and disadvantages, all considered in the design of the new proposed system. A thermomechanical model of the concept was developed and used in simulations to assess its behavior during both charging and discharging processes, as well as to evaluate the influence of critical design parameters. This same model was used to compare the technical performance of the concept against that of more conventional packed-beds with axial-flow. Results show that the novel concept is able to outperform the other systems by enabling a theoretical reduction of 46% and 50% in radiation losses and pressure drops, respectively, thus calling for future investigations, including an in-depth thermos-mechanical study and life-cycle analysis of the concept prior to building a lab-scale prototype.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-262567 (URN)10.1063/1.5117746 (DOI)2-s2.0-85070627314 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Garrido, J., Sjöqvist, R. & Laumert, B. (2019). Mechanical coupling behavior of a dish-Stirling receiver: Influence on the absorber tube stresses. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 050003.
Open this publication in new window or tab >>Mechanical coupling behavior of a dish-Stirling receiver: Influence on the absorber tube stresses
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 050003Conference paper, Published paper (Refereed)
Abstract [en]

The solar receiver tubes work under the highest temperatures and heat flux conditions, being their thermo-mechanical design critical to assure a safe and durable operation. Finite Element Analyses are traditionally utilized to assess the stresses for lifetime calculations. However, the real boundary conditions for these analyses are not well known yet. Thereby, this paper presents an experimental and numerical study to determine more realistic boundary conditions. Firstly, four deflection measurements are measured simultaneously by high-accuracy laser meters. Secondly, three types of boundary conditions are simulated trying to fit the experimental deflections: fixed, elastic and remote displacement. Finally, the stresses at critical regions are compared for each simulation. The results show that, unlike fixed support, remote displacement boundary conditions can obtain realistic deflection results but must be re-adjusted for each specific support, and elastic support fails to capture the manifold rotations. Using remote displacement stress results as reference for the case under study, fixed support leads to deviations in the stresses of at least 50% whilst elastic support can provide some similar stress results.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-262569 (URN)10.1063/1.5117586 (DOI)2-s2.0-85070594043 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191024

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2019-10-24Bibliographically approved
Gan, P. G., Monnerie, N., Brendelberger, S., Roeb, M., Guédez, R., Laumert, B. & Sattler, C. (2019). Modeling, simulation and economic analysis of CSP-driven solar fuel plant for diesel and gasoline production. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), Article ID 180009.
Open this publication in new window or tab >>Modeling, simulation and economic analysis of CSP-driven solar fuel plant for diesel and gasoline production
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2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, article id 180009Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The present research focuses on modeling of solar thermal driven fuel production plant with CO2 and H2O as raw materials to produce synthetic gas (syngas) which is converted into hydrocarbons through Fischer-Tropsch process either with Fe and Co catalyst to produce diesel, gasoline and kerosene. The solar reactor uses cerium oxide (CeO2) as a metal-redox and operates at 1773 K and 1300 K for reduction and oxidation step respectively under non-stoichiometric condition. The plant is analyzed by performing a quasi-steady state simulation under boundary condition that the Fischer-Tropsch reactor should operate with the capacity factor of 0.95 or 8350 hours annually. A storage tank is used to store and regulate the flow of syngas going into the Fischer-Tropsch reactor. Sensitivity analysis is carried out, particularly on solar reactor conversion and solid-to-solid heat exchanger efficiency. Another sensitivity analysis is to combine PV and CSP as the external electricity source. The production cost is finally calculated using annuity method with constant discount rate.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-262564 (URN)10.1063/1.5117689 (DOI)2-s2.0-85070648587 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Ayele, G. T., Mabrouk, M. T., Haurant, P., Laumert, B. & Lacarriere, B. (2019). Optimal placement and sizing of heat pumps and heat only boilers in a coupled electricity and heating networks. Paper presented at 31st International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems (ECOS), JUN 17-21, 2018, Guimaraes, PORTUGAL. Energy, 182, 122-134
Open this publication in new window or tab >>Optimal placement and sizing of heat pumps and heat only boilers in a coupled electricity and heating networks
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2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 182, p. 122-134Article in journal (Refereed) Published
Abstract [en]

Multi-energy systems are reported to have a better environmental and economic performance relative to the conventional, single-carrier, energy systems. Electrification of district heating networks using heat pumps and combined heat and power technologies is one such example. Due to lack of suitable modelling tools, however, the sizing and optimal placement of heat pumps is always done only from the heating network point of view which sometimes compromises the electricity network. This paper proposes an integrated optimization algorithm to overcome such limitation. A load flow model based on an extended energy hub approach is combined with a nested particle swarm optimization algorithm. A waste to energy combined heat and power plant, heat pumps (HPs), heat only boiler (HOB), solar photovoltaic, wind turbines and imports from the neighborhood grids are considered in the case studies. The results show that optimal placement and sizing of HPs and a HOB using the proposed methodology avoids an unacceptable voltage profiles and overloading of the electricity distribution network, which could arise while optimizing only from the heating network point of view. It also shows that up to 41.2% of the electric loss and 5% of the overall operating cost could be saved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
An extended energy hub, Coupled electricity and heating networks, Heat pump, Multi-carrier energy networks, Multi-energy systems, Particle swarm optimization (PSO)
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-257541 (URN)10.1016/j.energy.2019.06.018 (DOI)000479021700011 ()2-s2.0-85067664987 (Scopus ID)
Conference
31st International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems (ECOS), JUN 17-21, 2018, Guimaraes, PORTUGAL
Note

QC 20190918

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-09-18Bibliographically approved
Trevisan, S., Guédez, R. & Laumert, B. (2019). Preliminary assessment of integration of a packed bed thermal energy storage in a Stirling - CSP system. In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems. Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 200032.
Open this publication in new window or tab >>Preliminary assessment of integration of a packed bed thermal energy storage in a Stirling - CSP system
2019 (English)In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, American Institute of Physics (AIP), 2019, Vol. 2126, article id 200032Conference paper, Published paper (Refereed)
Abstract [en]

The present work deals with the thermodynamic analysis of four different integration schemes for a packed bed thermal energy storage in a Stirling - CSP system. Simplified models for the different systems' configurations have been developed and analyzed in steady and transient working conditions. Particularly, a parallel and serial connection between the power and the storage unit have been compared, showing a trade-off between the contemporaneity of power production and storage and the usefulness of the storage itself accordingly to the working temperature constraints for the power unit. It is shown that a closed parallel system configuration is the most promising solution as it allows for a longer production during night time and an higher net energy production, it is therefore worth of further investigations.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-258139 (URN)10.1063/1.5117747 (DOI)2-s2.0-85070630739 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191007

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-07Bibliographically approved
Wang, W. & Laumert, B. (2018). An axial type impinging receiver. Energy, 162, 318-334
Open this publication in new window or tab >>An axial type impinging receiver
2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 162, p. 318-334Article in journal (Refereed) Published
Abstract [en]

An axial type impinging receiver has been developed for a solar dish-Brayton system. By using selective reflection cavity surfaces as a secondary concentrator, the solar irradiation is reflected and concentrated on a cylindrical absorber that is located in the center of the cavity. A modified inverse design method was applied for quickly finding possible cavity receiver designs, and a numerical conjugate heat transfer model combined with a ray-tracing model was utilized for studying the detailed performance of the impinging receivers. The ray-tracing results show that the flux distribution on the cavity and absorber surfaces can be efficiently adjusted to meet the design requirements by changing the absorber diameter, the cavity diameter, the cavity length and the offset length. A candidate receiver design was selected for detailed numerical studies, and the results show that the average outlet air temperature and the radiative-to-thermal efficiency can reach 801.1 °C and 82.8% at a DNI level of 800 W/m2. The temperature differences on the absorber can be controlled within 122.7 °C for DNI level of 800 W/m2, and 126.4 °C for DNI level of 1000 W/m2. Furthermore, the structure is much simpler than a typical radial impinging design. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Axial type, Cavity receiver, Concentrated solar power, Dish Brayton, Impinging jet, Heat transfer, Inverse problems, Numerical methods, Solar energy, Brayton, Ray tracing, air temperature, design method, equipment, inverse analysis, irradiation, model, reflectivity, solar power, solar radiation
National Category
Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-236604 (URN)10.1016/j.energy.2018.08.036 (DOI)000447576500027 ()2-s2.0-85053077820 (Scopus ID)
Note

Export Date: 22 October 2018; Article; CODEN: ENEYD; Correspondence Address: Wang, W.; Department of Energy Technology, KTH Royal Institute of TechnologySweden; email: wujun@kth.se; Funding details: EU-FP7; Funding details: 308952; Funding text: This work was financially supported by the European Union's 7th Framework Programme (EU-FP7) project OMSoP (Grant Agreement No. 308952 ). QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-12-07Bibliographically approved
Topel, M., Ferruzza, D., Seeger, F. & Laumert, B. (2018). Analysis of plant performance with improved turbine flexibility: Test case on a parabolic trough configuration. In: AIP Conference Proceedings: . Paper presented at 23rd International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2017, 26 September 2017 through 29 September 2017. American Institute of Physics Inc.
Open this publication in new window or tab >>Analysis of plant performance with improved turbine flexibility: Test case on a parabolic trough configuration
2018 (English)In: AIP Conference Proceedings, American Institute of Physics Inc. , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Parabolic trough configurations account for 95% of the current installed concentrating solar power (CSP) capacity. Certainly this technology is considered as the most mature among other CSP types. However, regardless of its maturity, the pursuit of cost competitiveness with respect to fossil fuels and other renewables is still a dire need. One way to maximize profitability and improve performance is flexibility through fast starts. In this regard, the steam turbine has been identified as a key limiting component to the start-up process. This work focuses on analyzing the influence of steam turbine start-up parameters on the overall annual performance of a CSP plant. For this, a detailed parabolic trough power plant (PTPP) performance model was developed including a control strategy to account for turbine transient start-up constraints. The PTPP model was developed in accordance to the latest state-of-the-art of the technology. As such, the first part of the results consisted of validation studies of the model with respect to the actual power plant. The results obtained in this regard showed that the model correlates to the rated performance of the power plant with maximum errors of 12% and of 14% to the dynamic operation of the power plant. The second part of this work consisted of using the validated model in a series of sensitivity studies concerning the variation of different turbine start-up parameters. Results showed that improvements of up to 1.8% in the annual electricity production are possible with only 0.3% increase in fuel consumption.

Place, publisher, year, edition, pages
American Institute of Physics Inc., 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-247066 (URN)10.1063/1.5067088 (DOI)000481681200079 ()2-s2.0-85057090292 (Scopus ID)9780735417571 (ISBN)
Conference
23rd International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2017, 26 September 2017 through 29 September 2017
Note

QC 20190625

Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-09-05Bibliographically approved
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