The Experts below are selected from a list of 24363 Experts worldwide ranked by ideXlab platform
Eduardo Zarza - One of the best experts on this subject based on the ideXlab platform.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:Abstract The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology. The computational fluid dynamic package STAR-CCM+ is used to implement an efficient multiphase model capable of simulating the behavior of direct steam generation in parabolic-trough Solar Collectors. This work describes the modeling approach and summarizes the comparison of simulation results with the measurements taken at a direct steam generation Solar test facility located at the Plataforma Solar de Almeria, Spain.
David H Lobon - One of the best experts on this subject based on the ideXlab platform.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:Abstract The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology. The computational fluid dynamic package STAR-CCM+ is used to implement an efficient multiphase model capable of simulating the behavior of direct steam generation in parabolic-trough Solar Collectors. This work describes the modeling approach and summarizes the comparison of simulation results with the measurements taken at a direct steam generation Solar test facility located at the Plataforma Solar de Almeria, Spain.
Masud Behnia - One of the best experts on this subject based on the ideXlab platform.
-
Hydrodynamic Analysis of Direct Steam Generation Solar Collectors
Journal of Solar Energy Engineering-transactions of The Asme, 1999Co-Authors: S.d. Odeh, Masud Behnia, Graham MorrisonAbstract:Direct steam generation Collectors are considered with the aim to improve the performance of a parabolic trough collector leading to a reduction of operating costs of Solar electric generation systems. In this study a hydrodynamic steady state model is developed and linked with a thermal model to optimize the performance of once-through direct steam generation Solar Collectors. The hydrodynamic model includes flow pattern classification and a pressure drop model. Flow pattern maps for typical DSG Collectors with horizontal and inclined absorber tubes are generated to investigate the variation of flow conditions with radiation level, tube diameter, tube length and flow rate. Two-phase flow frictional pressure drop correlations for the range of operating conditions in a DSG collector are selected from the wide range of published correlations by comparison with experimental data for typical steam-water flow conditions in a DSG collector. Pressure drop is calculated for different operating conditions for both horizontal and inclined Solar absorber tubes. Alternative operational strategies are evaluated to achieve optimum performance of a direct steam generation collector at different radiation levels.
-
modelling of parabolic trough direct steam generation Solar Collectors
Solar Energy, 1998Co-Authors: S.d. Odeh, G L Morrison, Masud BehniaAbstract:Solar electric generation systems (SEGS) currently in operation are based on parabolic trough Solar Collectors using synthetic oil heat transfer fluid in the collector loop to transfer thermal energy to a Rankine cycle turbine via a heat exchanger. To improve performance and reduce costs direct steam generation in the collector has been proposed. In this paper the efficiency of parabolic trough Collectors is determined for operation with synthetic oil (current SEGS plants) and water (future proposal) as the working fluids. The thermal performance of a trough collector using Syltherm 800 oil as the working fluid has been measured at Sandia National Laboratory and is used in this study to develop a model of the thermal losses from the collector. The model is based on absorber wall temperature rather than fluid bulk temperature so it can be used to predict the performance of the collector with any working fluid. The effects of absorber emissivity and internal working fluid convection effects are evaluated. An efficiency equation for trough Collectors is developed and used in a simulation model to evaluate the performance of direct steam generation Collectors for different radiation conditions and different absorber tube sizes. Phase change in the direct steam generation collector is accounted for by separate analysis of the liquid, boiling and dry steam zones.
Harald Ries - One of the best experts on this subject based on the ideXlab platform.
-
compact high flux two stage Solar Collectors based on tailored edge ray concentrators
Solar Energy, 1996Co-Authors: Robert P. Friedman, Jeffrey M. Gordon, Harald RiesAbstract:The recently-invented tailored edge-ray concentrator (TERC) approach permits the design of compact two-stage high-flux Solar Collectors, with a focusing primary reflector and a non-imaging TERC secondary reflector. We present a new primary reflector shape based on the TERC approach and a secondary TERC tailored to its particular flux map, such that more compact concentrators emerge at flux concentration levels in excess of 90% of the thermodynamic limit. Calculations and raytrace simulation results are also offered which demonstrate that V-cone approximations to a wide variety of TERCs attain the concentration of the TERC to within a few percent. These V-cones represent practical secondary concentrators that may be superior to corresponding compound parabolic concentrator or trumpet secondaries.
-
compact high flux two stage Solar Collectors based on tailored edge ray concentrators
SPIE's 1995 International Symposium on Optical Science Engineering and Instrumentation, 1995Co-Authors: Robert P. Friedman, Jeffrey M. Gordon, Harald RiesAbstract:Using the recently-invented tailored edge-ray concentrator (TERC) approach for the design of compact two-stage high-flux Solar Collectors--a focusing primary reflector and a nonimaging TERC secondary reflector--we present: 1) a new primary reflector shape based on the TERC approach and a secondary TERC tailored to its particular flux map, such that more compact concentrators emerge at flux concentration levels in excess of 90% of the thermodynamic limit; and 2) calculations and raytrace simulations result which demonstrate the V-cone approximations to a wide variety of TERCs attain the concentration of the TERC to within a few percent, and hence represent practical secondary concentrators that may be superior to corresponding compound parabolic concentrator or trumpet secondaries.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Loreto Valenzuela - One of the best experts on this subject based on the ideXlab platform.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology.
-
modeling direct steam generation in Solar Collectors with multiphase cfd
Applied Energy, 2014Co-Authors: David H Lobon, Emilio Baglietto, Loreto Valenzuela, Eduardo ZarzaAbstract:Abstract The direct steam generation in parabolic-trough Solar Collectors, using water as heat-transfer fluid, is an attractive option for the economic improvement of parabolic trough technology for Solar thermal electricity generation in the multi megawatt range or industrial process heat supply. But the existence of single-phase and two-phase flow in the absorber pipes of the Solar Collectors constitutes a challenge for the development of simulation tools and process control schemes suitable for this type of Solar technology. The computational fluid dynamic package STAR-CCM+ is used to implement an efficient multiphase model capable of simulating the behavior of direct steam generation in parabolic-trough Solar Collectors. This work describes the modeling approach and summarizes the comparison of simulation results with the measurements taken at a direct steam generation Solar test facility located at the Plataforma Solar de Almeria, Spain.
