Radiant energy conversion in three cultivars of Phaseolus vulgaris

1985 ◽  
Vol 35 (1-4) ◽  
pp. 21-29 ◽  
Author(s):  
C COULSON
Keyword(s):  
Phaseolus Vulgaris ◽  
Energy Conversion ◽  
Radiant Energy

scholarly journals Combined Gas and Steam Cycle for a Gas-Cooled Solar Tower Power Plant

1981 ◽  
Author(s):  
B. Becker ◽  
H. H. Finckh ◽  
R. Meyer-Pittroff
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Gas Turbine ◽  
Steam Generator ◽  
Solar Power ◽  
Waste Heat ◽  
Radiant Energy ◽  
Combined Cycle ◽  
Conversion System ◽  
Energy Conversion System

In gas-cooled solar power plants the radiant energy of the sun is transferred to the cycle fluid in a cavity type solar receiver and converted into electric energy by means of a combined gas and steam turbine cycle incorporating a waste heat steam generator. The design and optimization of the energy conversion system in accordance with solar-specific considerations are described with particular regard to the gas turbine. In designing the energy conversion system several variants on the combined cycle with waste heat steam generator are investigated and special measures for the improvement of the cycle efficiency, such as the refinement of the steam process through the addition of pressure stages are introduced. It is demonstrated that the solar power plant meets the requirements both for straight solar and constant load operation with fossil fuel substitution. In order to establish the possibilities of attaining high part-load efficiencies in straight solar operation, two modes, variable and constant speed of the gas turbine, are compared with one another.

Energy Conversion From Fossil Fuel Into Spectral-Controlled Radiation for TPV by Super-Adiabatic Combustion in Porous Quartz Glass

2007 ◽  
Author(s):  
Tomoyuki Kumano ◽  
Katsunori Hanamura
Keyword(s):  
Energy Conversion ◽  
Quartz Glass ◽  
Fossil Fuel ◽  
Radiant Energy ◽  
Total Efficiency ◽  
Total Thickness ◽  
Generation System ◽  
Glass Plates ◽  
The Individual ◽  
Porous Quartz

Characteristics of energy conversion from fossil fuel into radiant energy in the energy-recirculated thermophotovoltaic (TPV) generation system with piled porous quartz glass plates have been investigated through numerical simulation. When the total thickness of the quartz glass plates is fixed, it is revealed that the conversion efficiency of the system does not almost depend on a combination of the number of the quartz glass plates and the individual thickness. However, the spectral efficiency with respect to the specific TPV cell may be improved as both the number of the quartz plates is larger and the individual thickness is smaller. As a result, it is suggested that the achievable total efficiency of the TPV system is expected to be over 15% under the condition that the emitter of the system is regarded as gray body and the total thickness of the quartz media is 30mm.

Physics Considerations of Solar Energy Conversion

1984 ◽  
Vol 106 (1) ◽  
pp. 3-15 ◽  
Author(s):  
A. F. Haught
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Radiant Energy ◽  
Solar Energy Conversion ◽  
Quantum Processes ◽  
Maximum Conversion ◽  
Energy Conversion Systems ◽  
Maximum Conversion Efficiency

A comparative analysis is presented of the conversion of radiant energy to useful work by thermal and quantum processes. The operation of thermal and quantum converters and the thermodynamic conversion efficiency of each are developed in terms of the mechanism of radiation-matter interaction in thermal and quantum systems. From the analysis the maximum conversion efficiency of a single-collector thermal converter with unconcentrated solar radiation and an ambient (reservoir) temperature of 300 K is 0.540; for the same conditions the maximum conversion efficiency of a single-collector quantum system is 0.309. The analysis is extended to consider the effects on the conversion efficiency of heat reject temperature, cascaded operation, in which the reject heat of the quantum converter is used as the input to a thermal bottoming cycle, and of concentration of the solar radiation. The results obtained represent the thermodynamic limits for radiant energy conversion by thermal and quantum processes, and calculations with solar input serve as a reference against which to judge the performance and capabilities of prospective solar energy conversion systems.

Combined Gas and Steam Cycle for a Gas-Cooled Solar Tower Power Plant

1982 ◽  
Vol 104 (2) ◽  
pp. 330-340 ◽  
Author(s):  
B. Becker ◽  
H. H. Finckh ◽  
R. Meyer-Pittroff
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Gas Turbine ◽  
Steam Generator ◽  
Solar Power ◽  
Waste Heat ◽  
Radiant Energy ◽  
Combined Cycle ◽  
Conversion System ◽  
Energy Conversion System

In gas-cooled solar power plants the radiant energy of the sun is transferred to the cycle fluid in a cavity type solar receiver and converted into electric energy by means of a combined gas and steam turbine cycle incorporating a waste heat steam generator. The design and optimization of the energy conversion system in accordance with solar-specific considerations are described with particular regard to the gas turbine. In designing the energy conversion system several variants on the combined cycle with waste heat steam generator are investigated and special measures for the improvement of the cycle efficiency, such as the refinement of the steam process through the addition of pressure stages are introduced. It is demonstrated that the solar power plant meets the requirements both for straight solar and constant load operation with fossil fuel substitution. In order to establish the possibilities of attaining high part-load efficiencies in straight solar operation, two modes, variable and constant speed of the gas turbine, are compared with one another.

Crop Production Potential and Energy Conversion Efficiency in Different Environments

1970 ◽  
Vol 6 (3) ◽  
pp. 197-204 ◽  
Author(s):  
David Gibbon ◽  
Robert Holliday ◽  
Francesco Mattei ◽  
Gaetano Luppi
Keyword(s):  
Solar Radiation ◽  
Sugar Beet ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Crop Production ◽  
Crop Yields ◽  
Radiant Energy ◽  
Energy Conversion Efficiency ◽  
Production Potential ◽  
Almost All

SUMMARYA method of estimating crop production potential was devised and tested in a number of contrasting solar radiation climates. With increasing levels of solar radiation, total dry matter yields of kale, maize and sugar beet increased, whilst energy conversion efficiency declined in kale and sugar beet but increased in maize. Maximum potential crop yields in almost all environments were achieved with a conversion efficiency of approximately 2 per cent of total radiant energy.

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