Turbine Selection for Small Capacity Solar-Power Generation

Mobarak, A.; Rafat, N.M.; Saad, Michel A.

doi:10.1016/b978-1-4832-8437-8.50091-0

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Among others, compressors and expanders can be employed in Rankine cycle engines, including organic (ORC) equivalents [16], for power generation. In fact, an efficient and low-cost expander is a crucial component of any economically efficient ORC system.…”

Section: Rankine Cycle Expandersmentioning

confidence: 99%

A Framework for the Analysis of Thermal Losses in Reciprocating Compressors and Expanders

Mathie

Markides

White

2014

Heat Transfer Engineering

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This article presents a framework that describes formally the underlying unsteady and conjugate heat transfer processes that are undergone in thermodynamic systems, along with results from its application to the characterization of thermodynamic losses due to irreversible heat transfer during reciprocating compression and expansion processes in a gas spring. Specifically, a heat transfer model is proposed that solves the one-dimensional unsteady heat conduction equation in the solid simultaneously with the first law in the gas phase, with an imposed heat transfer coefficient taken from suitable experiments in gas springs. Even at low volumetric compression ratios (of 2.5), notable effects of unsteady heat transfer to the solid walls are revealed, with thermally induced thermodynamic cycle (work) losses of up to 14% (relative to the work input/output in equivalent adiabatic and reversible compression/expansion processes) at intermediate Péclet numbers (i.e., normalized frequencies) when unfavorable solid and gas materials are selected, and closer to 10-12% for more common material choices. The contribution of the solid toward these values, through the conjugate variations attributed to the thickness of the cylinder wall, is about 8% and 2% points, respectively, showing a maximum at intermediate thicknesses. At higher compression ratios (of 6) a 19% worst-case loss is reported for common materials. These results suggest strongly that in designing high-efficiency reciprocating machines the full conjugate and unsteady problem must be considered and that the role of the solid in determining performance cannot, in general, be neglected.

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Section: Rankine Cycle Expandersmentioning

confidence: 99%

A Framework for the Analysis of Thermal Losses in Reciprocating Compressors and Expanders

Mathie

Markides

White

2014

Heat Transfer Engineering

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“…This boiler is the only custom component of the power plant, but it employs conventional heat exchanger technology so no fabrication difficulty is anticipated. Radial turbines are recommended for low power and low head applications and also for refrigerant Rankine cycles [3]. Due to the finite number of turbines available on the market, a specific turbine in the desired power range is chosen, and then all other system components are selected to match.…”

Section: Fig 3 Solar Collector Arrangementmentioning

confidence: 99%

Cost-Effective and Reliable Design of a Solar Thermal Power Plant

Aliabadi

Wallace

2009

Transactions of the Canadian Society for Mechanical Engineering

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A design study was conducted to evaluate the cost-effectiveness of solar thermal power generation in a 50 kWe power plant that could be used in a remote location. The system combines a solar collector-thermal storage system utilizing a heat transfer fluid and a simple Rankine cycle power generator utilizing R123 refrigerant. Evacuated tube solar collectors heat mineral oil and supply it to a thermal storage tank. A mineral oil to refrigerant heat exchanger generates superheated refrigerant vapor, which drives a radial turbogenerator. Supplemental natural gas firing maintains a constant thermal storage temperature irregardless of solar conditions enabling the system to produce a constant 50 kWe output. A simulation was carried out to predict the performance of the system in the hottest summer day and the coldest winter day for southern California solar conditions. A rigorous economic analysis was conducted. The system offers advantages over advanced solar thermal power plants by implementing simple fixed evacuated tube collectors, which are less prone to damage in harsh desert environment. Also, backed up by fossil fuel power generation, it is possible to obtain continued operation even during low insolation sky conditions and at night, a feature that stand-alone PV systems do not offer.

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“…When designing smaller solar power plants (up to 500 kW), the component with the major design problem is the turbine, ecpecially if the working fluid is steam [12,13]. For this power range the open-cycle gas turbine offers a better solution, since the overall dimensions of the turbomachinery and the prevailing blade heights could lead to still reasonable efficiency values.…”

Section: Turbomachinerymentioning

confidence: 99%

Small Gas Turbine With Large Parabolic Dish Collectors

Bammert¹,

Sutsch

Simon

et al. 1981

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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An alternative solution for solar energy conversion to the heliostat-tower and solar farm (parabolic trough) concept is presented in the form of large parabolic dish collectors using small high temperature gas turbines for producing electricity from solar thermal energy. A cost and efficiency comparison for the different solar thermal power plants has shown that the large parabolic dish with gas turbine set is a superior system design especially in the net power range of 50 to 2000 kW. The important advantages of the large parabolic dish concept are discussed. For the important components such as the gas turbo converter, the receiver and the parabolic dish collector, design proposals for economic solutions are presented. An advanced layout for a 250-kW gas turbo converter with recuperator is presented in detail.

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Turbine Selection for Small Capacity Solar-Power Generation

Cited by 4 publications

References 5 publications

A Framework for the Analysis of Thermal Losses in Reciprocating Compressors and Expanders

A Framework for the Analysis of Thermal Losses in Reciprocating Compressors and Expanders

Cost-Effective and Reliable Design of a Solar Thermal Power Plant

Small Gas Turbine With Large Parabolic Dish Collectors

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