scholarly journals Solar thermal conversion to electricity utilizing a central receiver, open cycle gas turbine design. Summary report

1977 ◽  
Author(s):  
Not Given Author
Keyword(s):  
Gas Turbine ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Summary Report ◽  
Central Receiver ◽  
Open Cycle ◽  
Turbine Design

Combined Solar Thermal Gas Turbine and Organic Rankine Cycle Application for Improved Cycle Efficiencies

2013 ◽  
Author(s):  
Karsten Kusterer ◽  
René Braun ◽  
Linda Köllen ◽  
Takao Sugimoto ◽  
Kazuhiko Tanimura ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Solar Thermal ◽  
Water Steam ◽  
Central Receiver ◽  
Combined Operation ◽  
Gas Turbine Cycle ◽  
Cycle Efficiency

Concentrating Solar Power (CSP) technologies are considered to provide a significant contribution for the electric power production in the future. Different kinds of CSP technologies are presently in operation or under development, e.g. parabolic troughs, central receivers, solar dish systems and Fresnel reflectors. In such applications, electricity is produced by thermal energy conversion cycles. For high MW-class CSP applications usually water/steam cycles (Rankine cycles) are used. Alternative technologies, especially for central receiver applications, are open and closed gas turbine cycles (Brayton cycles), where higher receiver fluid outlet temperatures can be applied. Therefore, there is the potential of higher cycle efficiencies and the advantage of reduced water consumption. The paper presents the results for design considerations to improve a gas turbine cycle of a 2 MWel class industrial gas turbine for solar-thermal application, where solar heat is fed in by a central receiver technology. The reference process is improved significantly by application of an intercooler between the two radial compressor stages and a recuperator, which recovers heat from the exhaust gases to the compressed air before the air is further pre-heated by the solar receiver. Hybrid operation of the gas turbine is considered. In order to further improve the overall cycle efficiency, the combined operation of the gas turbine and an Organic Rankine Cycle is investigated. The ORC can be coupled to the solar-thermal gas turbine cycle at the intercooler and after the recuperator. Therefore, waste heat from different cycle positions can be transferred to the ORC for additional production of electricity. The investigations have been performed by application of improved thermodynamic and process analysis tools, which consider real gas behavior of fluids and a huge number of organic fluids for application in ORCs. The results show that by choice of a suitable organic fluid the waste heat recovery can be further improved for the investigated gas turbine cycle. The major result of the study is that by combined operation of the solar thermal gas turbine and the ORC, the combined cycle efficiency is approximately 4%-points higher than in the solar-thermal gas turbine cycle.

Feasibility of Modifying Large Gas Turbines for Integration With External Heat Sources

1982 ◽  
Author(s):  
S. C. Kuo ◽  
T. L. O. Horton ◽  
E. R. Fisher ◽  
J. E. Bigger
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Thermal Power ◽  
External Heat ◽  
Solar Thermal ◽  
Heat Sources ◽  
Closed Cycle ◽  
Solar Thermal Power ◽  
Central Receiver ◽  
Near Term

This paper discusses the technical feasibility of modifying existing turbomachines for integration with external heat sources for electric power generation using renewable and/or alternate energy sources. One particular example is the use of a solar central receiver with a fossil combustor for hybrid solar thermal power conversion. The retrofit- and modification-of-turbomachinery approach would be applicable to both open- and closed-cycle operation with external heat sources. Therefore the open-cycle gas turbine modifications presented here are regarded as essential to closed-cycle applications as well. Four gas turbine models were selected as representative of the more attractive existing designs and sizes for solar thermal power applications, and the results of subsequent conceptual design modifications for near-term (20 to 50 MWe plant around 1990) and far-term (20 to 100 MWe plant after 1990) systems applications using turbine inlet temperatures of 840 C (1544 F) and 1100 C (2012 F), respectively, are presented.

scholarly journals Feasibility of a Helium Closed-Cycle Gas Turbine for UAV Propulsion

2020 ◽  
Vol 11 (1) ◽  
pp. 28
Author(s):  
Emmanuel O. Osigwe ◽  
Arnold Gad-Briggs ◽  
Theoklis Nikolaidis
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Pressure Ratio ◽  
Low Noise ◽  
Closed Cycle ◽  
Propulsion Systems ◽  
Component Design ◽  
Readiness Level ◽  
Aerial Vehicle ◽  
Turbine Design

When selecting a design for an unmanned aerial vehicle, the choice of the propulsion system is vital in terms of mission requirements, sustainability, usability, noise, controllability, reliability and technology readiness level (TRL). This study analyses the various propulsion systems used in unmanned aerial vehicles (UAVs), paying particular focus on the closed-cycle propulsion systems. The study also investigates the feasibility of using helium closed-cycle gas turbines for UAV propulsion, highlighting the merits and demerits of helium closed-cycle gas turbines. Some of the advantages mentioned include high payload, low noise and high altitude mission ability; while the major drawbacks include a heat sink, nuclear hazard radiation and the shield weight. A preliminary assessment of the cycle showed that a pressure ratio of 4, turbine entry temperature (TET) of 800 °C and mass flow of 50 kg/s could be used to achieve a lightweight helium closed-cycle gas turbine design for UAV mission considering component design constraints.

Self-encapsulating Ag nanospheres in amorphous carbon: A novel ultrathin selective absorber for flexible solar-thermal conversion

2021 ◽  
Author(s):  
Wei Li ◽  
Cheng-Bing Wang ◽  
Jinzhu Yang ◽  
Jiulong wang ◽  
Wenhe Zhang
Keyword(s):  
Energy Conversion ◽  
Amorphous Carbon ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Solar Absorbers ◽  
Energy Conversion Devices

Solar-thermal conversion is very appealing for various applications, especially in wearable energy conversion devices. Despite various solar absorbers having been developed, they are usually suitable only for rigid substrates. Hence...

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