Solar Field Efficiency and Electricity Generation Estimations for a Hybrid Solar Gas Turbine Project in France

The production of electricity with gas turbine and solar energy project aims to install at the Themis site (Targasonne, France) a prototype of hybrid solar/fossil gas-turbine system for electricity generation. The system features a 3800kWth pressurized air solar receiver combined with a fossil backup feeding a recuperated 1400kWe Turbomeca gas turbine with an external combustion chamber.

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Considerations for the Design of Solar-Thermal Chemical Processes

Journal of Solar Energy Engineering ◽

10.1115/1.4001474 ◽

2010 ◽

Vol 132 (3) ◽

Cited By ~ 8

Author(s):

Janna Martinek ◽

Melinda Channel ◽

Allan Lewandowski ◽

Alan W. Weimer

Keyword(s):

Solar Energy ◽

Water Splitting ◽

Thermal Reduction ◽

Absorption Efficiency ◽

Chemical Processes ◽

Solar Thermal ◽

System Efficiency ◽

Field Efficiency ◽

Definition Of ◽

Solar Field

A methodology is presented for the design of solar thermal chemical processes. The solar receiver efficiency for the high temperature step, defined herein as the ratio of the enthalpy change resulting from the process occurring in the receiver to the solar energy input, is limited by the solar energy absorption efficiency. When using this definition of receiver efficiency, both the optimal reactor temperature for a given solar concentration ratio and the solar concentration required to achieve a given temperature and efficiency shift to lower values than those dictated by the Carnot limitation on the system efficiency for the conversion of heat to work. Process and solar field design considerations were investigated for ZnO and NiFe2O4 “ferrite” spinel water splitting cycles with concentration ratios of roughly 2000, 4000, and 8000 suns to assess the implications of using reduced solar concentration. Solar field design and determination of field efficiency were accomplished using ray trace modeling of the optical components. Annual solar efficiency increased while heliostat area decreased with increasing concentration due to shading and blocking effects. The heliostat fields designed using system efficiency for the conversion of heat to work were found to be overdesigned by up to 21% compared with those designed using the receiver efficiency alone. Overall efficiencies of 13–20% were determined for a “ferrite” based water splitting process with thermal reduction conversions in the range of 35–100%.

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Adaptation and Modification of Gas Turbines for Solar Energy Applications

Volume 5: Turbo Expo 2005 ◽

10.1115/gt2005-68122 ◽

2005 ◽

Cited By ~ 13

Author(s):

Joseph Sinai ◽

Chemi Sugarmen ◽

Uriyel Fisher

Keyword(s):

Solar Energy ◽

Gas Turbine ◽

Gas Turbines ◽

High Efficiency ◽

The United States ◽

Combined Cycle ◽

Energy Applications ◽

Equipment Utilization ◽

German Aerospace ◽

Solar Field

Adapting a gas turbine to high-temperature solar receivers and solar tower technology constitutes real progress towards commercial solar power utilization with high efficiency combined cycle power system. Solar gas turbine systems can also be adapted to hybrid solar/fossil fuel operation, thanks to its high efficiency conversion, relatively small solar field, and quick response to load fluctuations, low CO2 emissions, easy start, and more effective equipment utilization. ORMAT initiated adaptation and modification of gas turbines for solar energy applications in the early 1990s in cooperation with the Weizmann Institute of Science and later with the Boeing Corporation, with the support of the United States Israel Science and Technology Foundation (USISTF). Ultimately, the concept reached its successful realization (2001–2004) in the solar tower Plataforma Solar de Almeria (Spain) which has three solar receivers and a receiving system designed and supplied by the German Aerospace Center DLR.

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Optimizing Large-Scale Solar Field Efficiency: Latvia Case Study

Energies ◽

10.3390/en14144171 ◽

2021 ◽

Vol 14 (14) ◽

pp. 4171

Author(s):

Ilze Polikarpova ◽

Roberts Kakis ◽

Ieva Pakere ◽

Dagnija Blumberga

Keyword(s):

Solar Energy ◽

Influencing Factors ◽

Heat Carrier ◽

Thermal Energy ◽

Solar Collector ◽

Energy Production ◽

Large Scale ◽

District Heating ◽

Field Efficiency ◽

Solar Field

Solar energy transformation technologies are increasingly being used worldwide in the district heating sector. In the Baltic states, only one district heating company has implemented a large-scale solar collector field into its thermal energy production system, which is analyzed within this research. In this study, we analyzed the first year operation of the solar field, solar collector efficiency, and several influencing factors, i.e., ambient air temperature, heat carrier flow, and the temperature difference between the supply and return heat carrier temperatures. The study includes collecting and compilation of the data, analyzing influencing factors, and data analysis using the statistical analysis method. In addition, the research presents a simplified multi-regression model based on the actual performance of a large-scale solar field, which allows for forecasting the efficiency of solar collectors by taking into account the main operational parameters of the DH system. The results show that solar energy covers around 90% of the summer heat load of a particular district heating system. However, they also show room for improvements in producing all the necessary heat in the summer using solar energy. The regression analyses show that the most significant correlation between all parameters examined was obtained in May, reaching R2 = 0.9346 in solar field efficiency evaluation. This is due to several suitable conditions for solar energy production, i.e., placing solar collectors at an angle for them to be the most productive, having enough space in the storage tank, and the demand for thermal energy being still higher than in the summer months.

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Gas Turbine Cycle with External Combustion Chamber for Prosumer and Distributed Energy Systems

Energies ◽

10.3390/en12183501 ◽

2019 ◽

Vol 12 (18) ◽

pp. 3501 ◽

Cited By ~ 7

Author(s):

Mikielewicz ◽

Kosowski ◽

Tucki ◽

Piwowarski ◽

Stępień ◽

...

Keyword(s):

Combustion Chamber ◽

Gas Turbine ◽

Power Plants ◽

Pass System ◽

Turbine Efficiency ◽

Lower Heating Value ◽

Wide Scale ◽

Open Cycle ◽

External Combustion ◽

Gas Turbine Cycle

The use of various biofuels, usually of relatively small Lower Heating Value (LHV), affects the gas turbine efficiency. The present paper shows that applying the proposed air by-pass system of the combustor at the turbine exit causes tan increase of efficiency of the turbine cycle increased by a few points. This solution appears very promising also in combined gas/steam turbine power plants. The comparison of a turbine set operating according to an open cycle with partial bypassing of external combustion chamber at the turbine exit (a new solution) and, for comparison, a turbine set operating according to an open cycle with a regenerator. The calculations were carried out for different fuels: gas from biomass gasification (LHV = 4.4 MJ/kg), biogas (LHV = 17.5 MJ/kg) and methane (LHV = 50 MJ/kg). It is demonstrated that analyzed solution enables construction of several kW power microturbines that might be used on a local scale. Such turbines, operated by prosumer’s type of organizations may change the efficiency of electricity generation on a country-wide scale evidently contributing to the sustainability of power generation, as well as the economy as a whole.

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Daily performance of a solar hybrid regenerative gas turbine in Colombia

Journal of Physics Conference Series ◽

10.1088/1742-6596/2073/1/012012 ◽

2021 ◽

Vol 2073 (1) ◽

pp. 012012

Author(s):

F Moreno-Gamboa ◽

E Vera-Duarte ◽

G Guerrero-Gómez

Keyword(s):

Theoretical Model ◽

Solar Radiation ◽

Combustion Chamber ◽

Gas Turbine ◽

Inlet Temperature ◽

Solar Concentrator ◽

Engine Efficiency ◽

Central Receiver ◽

Solar Receiver ◽

The Impact

Abstract This work presents the evolution of the operation of a regenerative hybrid solar gas turbine in an average day of the year. The system is evaluated by means of a thermodynamic model that includes a solar concentrated heliostat field solar concentrator with central receiver, a combustion chamber, and the thermal engine. The model is applied in Barranquilla, Colombia using local temperature and the solar radiation estimated with a theoretical model. Power output, the global efficiency and thermal engine efficiency are estimated. Additionally, to estimate the temperatures in different states of the cycle with and without regenerator. Finally, the impact of the regenerator is evaluated, which can increase the temperature of the solar receiver by up to 13.6%, and the inlet temperature to the combustion chamber increases by 17.3% at noon, when solar radiation is maximum.

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