Thermodynamic analysis and optimization of the cycle parameters of regenerative gas-turbine converters for solar power stations /SGTS/

Relative cost-effectiveness of CPC reflector designs suitable for evacuated absorber tube solar collectors

We propose a novel design method for reflective nonimaging concentrators that is based on maximizing system performance beyond standard nonimaging metrics of transfer efficiency and proscribed illumination distribution. This new technique enables system operation characteristics to influence the algorithm, including nongeometrical parameters. This algorithm is termed non-edge-ray design (NERD) because we found that edge rays do not always give optimal illumination design. The case of a diode-pumped, Nd:YAG solid state laser is provided as a confirmation of the design utility. The pump-to-mode configuration, which includes a nonimaging pump cavity reflector, is the focus of this investigation. The merit function of the design process includes not only the transfer efficiency from an extended, 2-D laser diode array, but also the mode coupling of the absorption distribution within a laser rod to its desired output mode. Standard edge-ray design is shown to limit performance, with both numerical and experimental results. Two alternative pump cavity reflectors are developed and the improvements in the outputs from the lasers in TEM00 modes are presented. A periodic cavity sees over 8% improvement in optical efficiency at an output power of 10 W, while an averaging cavity provides nearly 5% improvement.

Non-edge-ray design: improved optical pumping of lasers

Discussion des proprietes et des avantages d'une famille de concentrateurs ideaux a absorbeurs polygonaux

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Ideal concentrators with polygonal absorbers

Two ideal concentrators with fin absorbers in dielectric rhombuses are described. Expressions for the design, height, and mirror length are derived. The devices have a concentration factor (n/sin ϑM) that is clearly higher than the traditional air-filled ideal concentrators. They do not require more mirrors or space and, when such easily available dielectrics as glass and water are used, offer useful configurations for purposes such as the collection of solar energy.

Thermodynamic analysis and optimization of the cycle parameters of regenerative gas-turbine converters for solar power stations /SGTS/

Citations

Relative cost-effectiveness of CPC reflector designs suitable for evacuated absorber tube solar collectors

Non-edge-ray design: improved optical pumping of lasers

Ideal concentrators with polygonal absorbers

Ideal nonfocusing concentrator with fin absorbers in dielectric rhombuses

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