کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6767758 512463 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Field synergy principle analysis for reducing natural convection heat loss of a solar cavity receiver
ترجمه فارسی عنوان
تجزیه و تحلیل اصلی همجوشی زمینه برای کاهش گرما طبیعی گرما در یک گیرنده حفره خورشیدی
کلمات کلیدی
سیستم دنده موتور پارابولون خورشیدی، گیرنده حفره، تلفات حرارتی حرارتی طبیعی، اصل هماهنگی زمینه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
Due to the operating temperature from 900 K to 1300 K produced by the concentrating ratio over 2000 in solar parabolic dish-engine system, the natural convection heat loss driven by the buoyancy force of air contributes an important role in the energy loss of cavity receiver. 3-D numerical simulations were performed and the results are analyzed from the novel viewpoint of field synergy principle (FSP) in order to study the heat transfer and fluid flow characteristics in natural convection heat loss of cavity receiver. The effects of geometric parameters, including the inclination angle, aperture size, aperture position and cavity geometric shape on the natural convection heat loss of cavity receiver were examined. The FSP analysis on the simulation results demonstrates that FSP can well explain the reduction mechanism for natural convection heat loss of cavity receiver because the smaller inner production of velocity vector and temperature gradient always corresponds to the lower Nusselt number occurred in the cases with lager inclination angle, smaller aperture size, lower aperture position and frustum-cylinder cavity, respectively. Therefore, the reducing natural convection heat loss attributes to the weakening synergy between velocity vector and temperature gradient. In addition, the local heat transfer performance is studied by the presented distributions of heat transferred via fluid motion, where more interesting natural convection heat loss characteristics of cavity receiver and the detailed explanations were provided. The results of this work offer benefits for the development of theory and technique about reducing natural convection heat loss of cavity receiver.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 75, March 2015, Pages 257-265
نویسندگان
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