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Publications (10 of 15) Show all publications
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
Garrido, J., Aichmayer, L., Abou-Taouk, A. & Laumert, B. (2018). Experimental and numerical performance analyses of a Dish-Stirling cavity receiver: Geometry and operating temperature studies. Solar Energy, 170, 913-923
Open this publication in new window or tab >>Experimental and numerical performance analyses of a Dish-Stirling cavity receiver: Geometry and operating temperature studies
2018 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 170, p. 913-923Article in journal (Refereed) Published
Abstract [en]

Higher performance cavity receivers are needed to increase the competitiveness of solar power plants. However, the design process needs to be improved with more relevant experimental and numerical analyses. Thereby, the performance of four different Dish-Stirling cavities is investigated experimentally analyzing the influence of the cavity aperture diameter and shape at various operating temperatures. Temperatures inside the cavity receiver were collected together with the electrical power produced by the engine-generator. Then, a thermal system simulation was modelled and a comprehensive multi-parameter and multi-operation validation was performed. To improve this validation, the temperature distribution across the receiver tubes was analyzed in order to relate temperatures on the irradiated region with the non-irradiated one, where thermocouples can measure. The simulations were later used to obtain cavity receiver efficiencies, temperatures and loss breakdowns. The results show that the cavity receiver must be studied in optimization processes in conjunction with the other system components. Moreover, the reverse-conical cavity was found to be more efficient than a nearly cylindrical shape. Regarding the cavity receiver thermal losses, radiation and natural convection present similar contributions in the system under study. Finally, it was found that thermocouples installed on a non-irradiated region can be used to obtain peak receiver temperatures if the measurements are rectified by a correction value proportional to the DNI.

Place, publisher, year, edition, pages
Pergamon Press, 2018
Keywords
Solar simulator, Experimental measurements, System modelling, Receiver design
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-234615 (URN)10.1016/j.solener.2018.06.031 (DOI)000442713900083 ()
Note

QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved
Garrido, J., Aichmayer, L., Wang, W. & Laumert, B. (2017). Characterization of the KTH high-flux solar simulator combining three measurement methods. Energy, 141, 2091-2099
Open this publication in new window or tab >>Characterization of the KTH high-flux solar simulator combining three measurement methods
2017 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 141, p. 2091-2099Article in journal (Refereed) Published
Abstract [en]

This paper presents the characterization of the first Fresnel lens-based High-Flux Solar Simulator (HFSS) showing the evaluation of the total thermal radiative power dependent on the aperture radius at the focal plane. This result can be directly applied to calculate the thermal power input into any solar receiver tested in the KTH HFSS. Three measurement setups were implemented and their results combined to assess and verify the characterization of the solar simulator: a thermopile sensor measuring radiative flux, a CMOS camera coupled with a Lambertian target to obtain flux maps, and a calorimeter to measure the total thermal power within an area of 300×300 mm. Finally, a Monte Carlo analysis was performed to calculate the total uncertainties associated to each setup and to combine them to obtain the simulator characterization. The final result shows a peak flux of 6.8 ± 0.35 MW/m2 with a thermal power of 14.7 ± 0.75 kW within an aperture of 180 mm in diameter at the focal plane, and a thermal-electrical conversion efficiency of 25.8 ± 0.3%. It was found very good repeatability and a stable energy output from the lamps during the experiments.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Solar simulator, Characterization, Uncertainty analysis, Monte Carlo
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-219891 (URN)10.1016/j.energy.2017.11.067 (DOI)000423249200061 ()2-s2.0-85036450427 (Scopus ID)
Note

QC 20171215

Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2018-04-17Bibliographically approved
Wang, W., Aichmayer, L., Garrido, J. & Laumert, B. (2017). Development of a Fresnel lens based high-flux solar simulator. Solar Energy, 144, 436-444
Open this publication in new window or tab >>Development of a Fresnel lens based high-flux solar simulator
2017 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 144, p. 436-444Article in journal (Refereed) Published
Abstract [en]

In this paper, a Fresnel lens based high flux solar simulator (HFSS) is developed for concentrating solar power research and high temperature material testing. In this design, each commercially available 7 kW(e) xenon-arc lamp is coupled with a silicone-on-glass Fresnel lenses as the optical concentrator, and 12 lamp-lens units are distributed in a circular array. In total, the power of the solar simulator can reach 84 kWe. A ray tracing model has been developed based on the real arc-emitter shape and the Fresnel lens optics for predicting the optical performance of the HFSS design. The testing result shows that the ray tracing model can predict the flux distribution on the focal plane accurately but a bit conservative in the center region. The flux distribution on the focal plane appears axisymmetric with a peak flux of 7.22 MW/m(2), and 19.7 kW of radiative power in total is delivered on a 280 mm diameter target. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2017
Keywords
High flux solar simulator, Fresnel lens, Concentrating solar energy, Xenon lamp
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-205490 (URN)10.1016/j.solener.2017.01.050 (DOI)000397550500044 ()2-s2.0-85011317412 (Scopus ID)
Note

QC 20170524

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2018-04-17Bibliographically approved
Aichmayer, L., Wang, W., Garrido, J. & Laumert, B. (2016). Experimental Flux Measurement of a High-Flux Solar Simulator using a Lambertian Target and a Thermopile Flux Sensor. In: AIP Conference Proceedings 1734: . Paper presented at International SolarPACES Conference 2015. Cape Town, South Africa. October 13-16, 2015. American Institute of Physics (AIP), 1734, Article ID 130001.
Open this publication in new window or tab >>Experimental Flux Measurement of a High-Flux Solar Simulator using a Lambertian Target and a Thermopile Flux Sensor
2016 (English)In: AIP Conference Proceedings 1734, American Institute of Physics (AIP), 2016, Vol. 1734, article id 130001Conference paper, Published paper (Refereed)
Abstract [en]

A measurement system for the experimental determination of the flux distribution at the focal plane of the KTH high-flux solar simulator was designed and implemented. It is based on a water-cooled Lambertian target and a thermopile flux sensor placed close to the focal point of the solar simulator. Correction factors to account for systematic effects were determined and an uncertainty analysis was performed. The measurement system was successfully used to evaluate the flux distribution of a single lamp/lens-arrangement with a peak flux of 675kW/m².

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2016
Series
AIP Conference Proceedings, ISSN 0094-243X ; 1734
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-182834 (URN)10.1063/1.4949211 (DOI)000380374600186 ()2-s2.0-84984541445 (Scopus ID)9780735413863 (ISBN)
Conference
International SolarPACES Conference 2015. Cape Town, South Africa. October 13-16, 2015
Note

QC 20170807

Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2017-08-07Bibliographically approved
Aichmayer, L., Spelling, J. & Laumert, B. (2015). Preliminary design and analysis of a novel solar receiver for a micro gas-turbine based solar dish system. Solar Energy, 114(4), 378-396
Open this publication in new window or tab >>Preliminary design and analysis of a novel solar receiver for a micro gas-turbine based solar dish system
2015 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 114, no 4, p. 378-396Article in journal (Refereed) Published
Abstract [en]

The solar receiver is one of the key components of hybrid solar micro gas-turbine systems, which would seem to present a number of advantages when compared with Stirling engine based systems and photovoltaic panels. In this study a solar receiver meeting the specific requirements for integration into a small-scale (10 kWel) dish-mounted hybrid solar micro gas-turbine system has been designed with a special focus on the trade-offs between efficiency, pressure drop, material utilization and economic design. A situation analysis, performed using a multi-objective optimizer, has shown that a pressurized configuration, where the solar receiver is placed before the turbine, is superior to an atmospheric configuration with the solar receiver placed after the turbine. Based on these initial design results, coupled CFD/FEM simulations have been performed, allowing detailed analysis of the designs under the expected operating conditions. The results show that the use of volumetric solar receivers to provide heat input to micro gas-turbine based solar dish systems appears to be a promising solution; with material temperatures and material stresses well below permissible limits.

Keywords
Solar receiver, Micro gas-turbine, Mutli-objective optimization, Coupled CFD/FEM analysis
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-161705 (URN)10.1016/j.solener.2015.01.013 (DOI)000353080700033 ()2-s2.0-84924066245 (Scopus ID)
Note

QC 20150324

Available from: 2015-03-13 Created: 2015-03-13 Last updated: 2018-04-17Bibliographically approved
Aichmayer, L., Spelling, J. & Laumert, B. (2015). Thermoeconomic Analysis of a Solar Dish Micro Gas-Turbine Combined-Cycle Power Plant. In: Energy Procedia 69: . Paper presented at International SolarPACES Conference 2014. Beijing, China. September 16-19, 2014. (pp. 1089-1099). Elsevier, 69
Open this publication in new window or tab >>Thermoeconomic Analysis of a Solar Dish Micro Gas-Turbine Combined-Cycle Power Plant
2015 (English)In: Energy Procedia 69, Elsevier, 2015, Vol. 69, p. 1089-1099Conference paper, Published paper (Refereed)
Abstract [en]

A novel solar power plant concept is presented, based on the use of a coupled network of hybrid solar-dish micro gas-turbines, driving a centralized heat recovery steam generator and steam-cycle, thereby seeking to combine the high efficiency of the solar dish collector with a combined-cycle power block. A 150 MWe solar power plant was designed based on this concept and compared with both a conventional combined-cycle power plant and a hybrid solar-tower combined-cycle. The solar dish combined-cycle power plant could reach higher levels of solar integration than other concepts but was shown to be more expensive with current technology; solar electricity costs are double those of the hybrid solar-tower combined cycle.

Place, publisher, year, edition, pages
Elsevier, 2015
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-157823 (URN)10.1016/j.egypro.2015.03.217 (DOI)000358735000116 ()2-s2.0-84943608048 (Scopus ID)
Conference
International SolarPACES Conference 2014. Beijing, China. September 16-19, 2014.
Note

QC 20150622

Available from: 2014-12-16 Created: 2014-12-16 Last updated: 2018-04-20Bibliographically approved
Spelling, J., Aichmayer, L. & Laumert, B. (2015). Thermoeconomic Evaluation of a Novel Utility-Scale Hybrid Solar Dish Micro Gas-Turbine Power Plant. In: Proceedings of the ASME Turbo Expo 2015. Montreal, Canada. June 15-19: . Paper presented at ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015, Montreal, Canada, 15 June 2015 through 19 June 2015. ASME Press
Open this publication in new window or tab >>Thermoeconomic Evaluation of a Novel Utility-Scale Hybrid Solar Dish Micro Gas-Turbine Power Plant
2015 (English)In: Proceedings of the ASME Turbo Expo 2015. Montreal, Canada. June 15-19, ASME Press, 2015Conference paper, Published paper (Refereed)
Abstract [en]

A novel solar power plant concept is presented, based on the use of a coupled network of hybrid solar-dish micro gas-turbines, driving a centralized heat recovery steam generator and steam-cycle, thereby seeking to combine the high collector efficiency of the solar dish with the high conversion efficiency of a combined-cycle power block. To explore the potential of the concept, its performance has been compared against a more conventional solar dish farm based on recuperated micro gas-turbines. Multi-objective optimization has been used to identify Pareto-optimal designs and examine the trade-offs between minimizing capital costs and maximizing performance. The micro gas-turbine combined-cycle layout has been shown to be promising for utility-scale applications, reducing electricity costs by 5–10%, depending on the degree of solar integration; this novel power plant layout also reduces emissions through increased conversion efficiency of the power block. However, at smaller plant sizes (outputs below 18 MWe), more traditional recuperated solar dish farms remain the most viable option.

Place, publisher, year, edition, pages
ASME Press, 2015
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-183002 (URN)10.1115/GT2015-42368 (DOI)000380084500020 ()2-s2.0-84954357535 (Scopus ID)978-0-7918-5667-3 (ISBN)
Conference
ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015, Montreal, Canada, 15 June 2015 through 19 June 2015
Note

QC 20160311

Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2017-04-19Bibliographically approved
Wang, W., Ragnolo, G., Aichmayer, L., Strand, T. & Laumert, B. (2014). Integrated Design of a Hybrid Gas Turbine-Receiver Unit for a Solar Dish System. In: Proceedings of the International SolarPACES Conference 2014. Beijing, China. September 16-19, 2014: . Paper presented at International SolarPACES Conference 2014, Beijing, China, September 16-19, 2014.
Open this publication in new window or tab >>Integrated Design of a Hybrid Gas Turbine-Receiver Unit for a Solar Dish System
Show others...
2014 (English)In: Proceedings of the International SolarPACES Conference 2014. Beijing, China. September 16-19, 2014, 2014Conference paper, Published paper (Refereed)
Abstract [en]

An integrated design concept of a 25 KWel hybrid gas turbine-receiver unit is introduced in this paper. In this design, hot section; receiver, combustor and turbine, is integrated and located in the center of the unit in order to achieve a compact structure with low heat loss and cooling requirement. A ray tracing model is developed for analyzing the focal plane of the potential parabolic dish design and predicting the radiative flux boundary conditions of the receiver. An impinging cavity receiver, with a cylindrical absorber wall and a semi-spherical bottom, is chosen as the receiver for this hybrid unit. The cooling capacities of different impinging arrangements are calculated to determine the thermal boundary conditions on the cooling side. Finally, the optimal dimensions of the receiver are chosen as well as the impingement cooling design. A ‘single ring’ impinging array was found to be optimal for cooling down the wall temperature of the peak flux region to 1200 °C and provide a receiver exit temperature of 840 °C.

Keywords
Integrated design, Dish Brayton system, Cavity receiver, Impinging
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-159596 (URN)10.1016/j.egypro.2015.03.067 (DOI)000358735000063 ()2-s2.0-84943643793 (Scopus ID)
Conference
International SolarPACES Conference 2014, Beijing, China, September 16-19, 2014
Note

QC 20150302

Available from: 2015-02-04 Created: 2015-02-04 Last updated: 2015-11-23Bibliographically approved
Aichmayer, L., Spelling, J. & Laumert, B. (2014). Small Scale Hybrid Solar Power Plants for Polygeneration in Rural Areas. In: Energy Procedia 57: . Paper presented at ISES Solar World Congress 2013. Cancun, Mexico. November 3-7, 2013 (pp. 1536-1545). Elsevier, 57
Open this publication in new window or tab >>Small Scale Hybrid Solar Power Plants for Polygeneration in Rural Areas
2014 (English)In: Energy Procedia 57, Elsevier, 2014, Vol. 57, p. 1536-1545Conference paper, Published paper (Refereed)
Abstract [en]

Small scale micro gas-turbine based hybrid solar power plants are a promising technology for supplying multiple energy services in a controllable and sustainable manner using polygeneration technologies. Compared to a conventional diesel generator based system where electricity is used as the main energy carrier, these systems show great potential to reduce costs and carbon dioxide emissions. Depending on the design, carbon dioxide emissions are reduced by around 9% and equivalent annual costs are reduced by 21% - 26%, as compared to a base polygeneration configuration where cooling services are provided centrally by an absorption chiller without integrating a solar micro gas-turbine. Compared to the system where electricity is used as the main energy carrier a reduction of equivalent annual costs of up to 20% and a reduction of carbon dioxide emissions of up to 33.5% was achieved.

Place, publisher, year, edition, pages
Elsevier, 2014
Series
Energy Procedia, ISSN 1876-6102 ; 57
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-126928 (URN)10.1016/j.egypro.2014.10.113 (DOI)000348253201075 ()2-s2.0-84922326044 (Scopus ID)
Conference
ISES Solar World Congress 2013. Cancun, Mexico. November 3-7, 2013
Note

QC 20150325

Available from: 2013-08-22 Created: 2013-08-22 Last updated: 2018-04-17Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-3789-8654

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