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Development of an Impinging Receiver for Solar Dish-Brayton Systems
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Concentrating Solar Power Group)ORCID iD: 0000-0003-4134-3520
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A new receiver concept utilizing impinging jet cooling technology has been developed for a small scale solar dish-Brayton system. In a typical impinging receiver design, the jet nozzles are distributed evenly around the cylindrical absorber wall above the solar peak flux region for managing the temperature at an acceptable level. The absorbed solar irradiation is partially lost to the ambient by radiation and natural convection heat transfer, the major part is conducted through the wall and taken away by the impingement jets to drive a gas turbine. Since the thermal power requirement of a 5 kWe Compower® micro gas turbine (MGT) perfectly matches with the power collected by the EuroDish when the design Direct Normal Irradiance (DNI) input is 800 W/m2, the boundary conditions for the impinging receiver design in this work are based on the combination of the Compower®MGT and the EuroDish system.

In order to quickly find feasible receiver geometries and impinging jet nozzle arrangements for achieving acceptable temperature level and temperature distributions on the absorber cavity wall, a novel inverse design method (IDM) has been developed based on a combination of a ray-tracing model and a heat transfer analytical model. In this design method, a heat transfer model of the absorber wall is used for analyzing the main heat transfer process between the cavity wall outer surface, the inner surface and the working fluid. A ray-tracing model is utilized for obtaining the solar radiative boundary conditions for the heat transfer model. Furthermore, the minimum stagnation heat transfer coefficient, the jet pitch and the maximum pressure drop governing equations are used for narrowing down the possible nozzle arrangements. Finally, the curves for the required total heat transfer coefficient distribution are obtained and compared with different selected impinging arrangements on the working fluid side, and candidate design configurations are obtained.

Furthermore, a numerical conjugate heat transfer model combined with a ray-tracing model was developed validating the inverse design method and for studying the thermal performance of an impinging receiver in detail. With the help of the modified inverse design method and the numerical conjugate heat transfer model, two impinging receivers based on sintered α-SiC (SSiC) and stainless steel 253 MA material have been successfully designed. The detailed analyses show that for the 253 MA impinging receiver, the average air temperature at the outlet and the thermal efficiency can reach 1071.5 K and 82.7% at a DNI level of 800 W/m2 matching the system requirements well. Furthermore, the local temperature differences on the absorber can be reduced to 130 K and 149 K for two different DNI levels, which is a significant reduction and improvement compared with earlier published cavity receiver designs. The inverse design method has also been verified to be an efficient way in reducing the calculation costs during the design procedure.

For the validation and demonstration of the receiver designs, a unique experimental facility was designed and constructed. The facility is a novel high flux solar simulator utilizing for the first time Fresnel lenses to concentrate the light of 12 commercial high power Xenon-arc lamps. Finally, a prototype of a 253 MA based impinging was experimentally studied with the help of the 84 kWe Fresnel lens based high flux solar simulator in KTH.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , xxiv, 111 p.
Series
TRITA-KRV, ISSN 1100-7990 ; 15:05
Keyword [en]
Concentrating solar power; Impinging receiver; Inverse design method; Conjugate heat transfer; High flux solar simulator
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-177531ISBN: 978-91-7595-796-8 (print)OAI: oai:DiVA.org:kth-177531DiVA: diva2:873171
Public defence
2015-12-16, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 09:30 (English)
Opponent
Supervisors
Projects
Optimised Microturbine Solar Power System , OMSOP
Funder
EU, FP7, Seventh Framework Programme, FP7-308952​
Note

QC 20151123

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-23Bibliographically approved
List of papers
1. An inverse design method for a cavity receiver used in solar dish Brayton system
Open this publication in new window or tab >>An inverse design method for a cavity receiver used in solar dish Brayton system
2014 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 110, 745-755 p.Article in journal (Refereed) Published
Abstract [en]

An inverse design method is developed in order to quickly find possible cavity receiver designs with relative uniform cavity wall surface temperature for a solar dish cavity receiver. In this design method, a heat transfer model of the absorber wall is used for analyzing the main heat transfer process between the cavity wall outer surface, the inner surface and the working fluid. Furthermore, a ray-tracing model based on the parameters of a real dish is utilized for obtaining the solar radiative boundary conditions for the heat transfer model. Impinging jet cooling technology is introduced due to its high heat transfer coefficient in the stagnation area, which can be used for cooling the peak flux on the cavity wall. After applying a well-designed impinging system, the temperature peak on the peak flux region in traditional receiver designs can be mitigated without introducing any over pressure drop problem.

Place, publisher, year, edition, pages
Elsevier, 2014
Keyword
Parabolic dish, Cavity solar receiver, Inverse design method, Impinging
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-159595 (URN)10.1016/j.solener.2014.10.019 (DOI)000347579100069 ()2-s2.0-84910682216 (Scopus ID)
Projects
Optimised Microturbine Solar Power system​ (OMSoP)
Funder
EU, FP7, Seventh Framework Programme, FP7-308952​
Note

QC 20150225

Available from: 2015-02-04 Created: 2015-02-04 Last updated: 2017-12-05Bibliographically approved
2. Conjugate heat transfer analysis of an impinging receiver design for a dish-Brayton system
Open this publication in new window or tab >>Conjugate heat transfer analysis of an impinging receiver design for a dish-Brayton system
2015 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 119, 298-309 p.Article in journal (Refereed) Published
Abstract [en]

An impinging receiver design has been developed for a small scale solar dish-Brayton system. A numerical conjugate heat transfer model combined with a ray-tracing model, based on the boundary conditions of the micro gas turbine and the EuroDish system, has been used for studying the thermal performance of an impinging receiver. According to the results of the preliminary estimation by an inverse design method, four possible impinging nozzle arrangements have been studied by the numerical model based on a 240 mm diameter and 3 mm wall thickness cavity. The inverse design method has been verified to be an efficient way in reducing the calculation costs during the design procedure. Furthermore, the impacts of the cavity diameter and the wall thickness have also been studied.

Place, publisher, year, edition, pages
Elsevier, 2015
Keyword
Conjugate heat transfer, Parabolic dish, Impinging solar receiver, Inverse design method
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-175511 (URN)10.1016/j.solener.2015.07.013 (DOI)000361583300026 ()2-s2.0-84937796589 (Scopus ID)
Note

QC 20151021

Available from: 2015-10-21 Created: 2015-10-16 Last updated: 2017-12-01Bibliographically approved
3. The effect of nozzle arrangement to the thermal performance of impinging receiver
Open this publication in new window or tab >>The effect of nozzle arrangement to the thermal performance of impinging receiver
Show others...
(English)Manuscript (preprint) (Other academic)
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-177550 (URN)
Note

QS 2015

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-23Bibliographically approved
4. Design and Validation of a Low-cost High-flux Solar Simulator using Fresnel Lens Concentrators
Open this publication in new window or tab >>Design and Validation of a Low-cost High-flux Solar Simulator using Fresnel Lens Concentrators
2013 (English)In: Proceedings of the SolarPACES 2013 International Conference, Elsevier, 2013, 2221-2230 p.Conference paper, Published paper (Refereed)
Abstract [en]

A systematic design procedure for a high flux solar simulator is presented in this paper. The 84 kWe solar simulator is based on an array of 12 commercially available xenon-arc lamps (each 7 kWe) coupled with silicone-on-glass Fresnel lenses as the optical concentrator. A ray-tracing model of the xenon lamp has been developed based on the real emitter shape and the Fresnel lens optics; simulations performed using a non-sequential Monte Carlo technique have been validated against experimental test data. The results show that 19.7 kW of radiative power is delivered on a 20 cm diameter target with and a peak flux of 6.73 MW/m2 and an electricity to radiative power efficiency of 23.4%. This research facility will be used as an experimental platform for high flux solar receiver and thermochemical reactor research, as well as for advanced high-temperature material testing.

Place, publisher, year, edition, pages
Elsevier, 2013
Series
Energy Procedia, ISSN 1876-6102 ; 49
Keyword
Concentrated solar energy, Fresnel lens, High flux, Solar simulator, Xenon lamp
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-126933 (URN)10.1016/j.egypro.2014.03.235 (DOI)000340733700229 ()2-s2.0-84902285976 (Scopus ID)
Conference
International Conference on Solar Power and Chemical Energy Systems, SolarPACES 2013; Las Vegas, NV; United States; 17 September 2013 through 20 September 2013
Note

QC 20140916

Available from: 2013-08-22 Created: 2013-08-22 Last updated: 2015-11-23Bibliographically approved
5. Integrated Design of a Hybrid Gas Turbine-Receiver Unit for a Solar Dish System
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.

Keyword
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

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