کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5450718 1513065 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical properties of high temperature molten salt mixtures for volumetrically absorbing solar thermal receiver applications
ترجمه فارسی عنوان
خواص نوری مخلوط های نمکی مذاب با درجه حرارت بالا برای جذب طیفی از کاربردهای گیرنده حرارتی خورشیدی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی


- Developed an apparatus for high temperature fluid optical property measurements.
- Properties of molten salts and effects of thermal decomposition are characterized.
- Volumetric receiver performance parameters are proposed.
- Performance of fluids is given in terms of receiver size and solar concentration.

Molten salts are promising candidates for liquid volumetric absorbers in concentrated solar power systems. To characterize absorption and heat transfer performance in high temperature applications, their optical properties are required. Thus a method for experimentally determining the absorption coefficient of non-scattering high temperature semi-transparent liquids for large (∼1 m-deep) direct absorption solar receiver applications was developed. It was used to measure the absorption coefficient in liquids over a broad spectral range and temperatures up to 800 °C in a 40 wt.% KNO3:60 wt.% NaNO3 binary nitrate molten salt mixture (solar salt) and a 50 wt.% KCl:50 wt.% NaCl binary chloride molten salt mixture. The binary nitrate and binary chloride both demonstrated well distributed solar absorption (>95% absorption through 1 m and 2 m, respectively). At 400 °C, the binary nitrate is optically thick in its re-emission spectrum and behaves as a blackbody radiator. The effects of thermal decomposition were also shown to have significant consequences on the overall performance of the binary nitrate mixture, transforming it into an opaque surface absorber following thermal degradation (>95% in <0.25 m). The implications of these results for solar receiver design are discussed in terms of volumetric absorption, total effective emissivity, and capture efficiency. The measurement technique developed and results are relevant in a variety of high temperature applications including heat transfer systems, materials processing, pharmaceuticals, and food processing facilities.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 153, 1 September 2017, Pages 238-248
نویسندگان
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