کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5478611 1521898 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of the temperature distribution on the thermal resistance of double u-tube borehole heat exchangers
ترجمه فارسی عنوان
اثرات توزیع دما بر مقاومت حرارتی مبدل های گرمای دو لوله ای گوه
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی
The effects of the surface temperature distribution on the thermal resistance of a double U-tube Borehole Heat Exchanger (BHE) are studied by finite element simulations. It is shown that the thermal resistance of a BHE cross section is not influenced by the bulk-temperature difference between pairs of tubes, but is influenced by the thermal conductivity of the ground when the shank spacing is high. Then it is shown that, if the real mean values of the fluid bulk temperature and of the BHE external surface are considered, the 3D thermal resistance of the BHE coincides with the thermal resistance of a BHE cross section, provided that the latter is invariant along the BHE. Finally the difference between the BHE thermal resistance and the effective BHE thermal resistance, defined by replacing the real mean temperature of the fluid with the average of inlet and outlet temperature, is evaluated in some relevant cases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geothermics - Volume 71, January 2018, Pages 46-54
نویسندگان
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