کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1550756 998107 2011 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermal regimes in solar-thermal linear collectors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Thermal regimes in solar-thermal linear collectors
چکیده انگلیسی

The physics of linear receivers is analysed, including the effects of the natural aperture of the solar radiation (32′ conical angle) on the radiation concentration achievable with a given geometry. This analysis is oriented to identify features of the thermal performance of the receiver in different radiation conditions. It will be seen that two thermal regimes can be distinguished in that dependence, with a step-wise separation from the first one, at low levels of radiation intensity, to the second one, at high levels. The step appears at a value of the concentrated radiation intensity which depends on the temperature that must be achieved at the outlet of the receiver. This fact points out the need of studying at depth the features of systems with concentration factors around the threshold to the second regime, where thermal efficiencies reach a plateau. It is shown that some Fresnel structures with adequate concentrating geometries are able to go beyond the threshold for reaching final temperatures of 400 °C, which opens new possibilities for these structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 85, Issue 5, May 2011, Pages 857–870
نویسندگان
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