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Título del libro: Proceedings Of The Solar World Congress 2005: Bringing Water To The World, Including Proceedings Of 34th Ases Annual Conference And Proceedings Of 30th National Passive Solar Conference
Título del capítulo: Outdoor uncertainty on heat mux measurement

Autores UNAM:
CARLOS ALBERTO PEREZ RABAGO; CLAUDIO ALEJANDRO ESTRADA GASCA;

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Autores externos:

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Idioma:

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Año de publicación:
2005

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Palabras clave:

Calibration data; CFD codes; Concentrated solar energy; Front face; Heat transfer mechanism; Linear correlation; Numerical heat transfer; Operational conditions; Sensor calibration; Solar irradiances; Standard measurements; Theoretical models; Thermal loss; Wind speed; Calibration; Gages; Heat transfer; Sensors; Solar radiation; Wind effects; Uncertainty analysis

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Resumen:

A numerical heat transfer study of Gardon gages is presented. This type of sensor is the most commonly used for the measurement of very high solar irradiance. When a high concentrated solar energy hiis the surface gage, a voltage caused by a temperature gradient at the absorption surface is measured. A linear correlation between the voltage measured and the solar irradiance is commonly assumed and it is used for the indoors sensor calibration. However, this assumption should be verified for all outdoors operational condiions of the gage. A 2.54 cm front-face Gardon gage was used for this study. The gauge range is from 0 to 1200 kW m-2. All heat transfer mechanisms are taken into accountin the theoretical model which is solved using a commercial CFD code (FLUENT). It was verified that the difference between the theoretical data and the calibration data is smaller to 5%. Also, the heat losses for different operational conditions were evaluated, doing mainly for varying the wind speed in the front face of the device. It was found that the thermal losses can be as high as 6.3% for wind speeds of 60 km h-1. In standard measurement of high irradiance flux, these losses are not taking into account.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9781622762637
Editorial:

Tipo de producto:
Conference Paper