کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7936789 1513083 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A numerical and experimental investigation on the performance of a low-flux direct absorption solar collector (DASC) using graphite, magnetite and silver nanofluids
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
A numerical and experimental investigation on the performance of a low-flux direct absorption solar collector (DASC) using graphite, magnetite and silver nanofluids
چکیده انگلیسی
Application of nanofluids as a potential working fluid in solar-to-thermal energy conversion systems has shown remarkable improvements in solar power systems. Herein, a combined numerical and experimental study has been conducted on a nanofluid direct absorption collector utilizing three types of nanoparticles (i.e., graphite, magnetite, and silver) dispersed in deionized water as the absorbing medium. To increase the dispersion stability, surface modification was performed on the nanoparticles prior to the preparation of nanofluids via the two-step method and the optical characteristics of nanofluids were experimentally evaluated prior to their use in the DASC. A two-dimensional computational fluid dynamics simulation model was developed to solve the radiative transfer in particulate media and heat transfer equations. Considering the absorption and scattering within the nanofluid medium, the nanofluid temperature distribution within the collector was evaluated. Simultaneously, experiments were performed on a direct absorption collector to validate the numerical model and to investigate the effect of solar flux intensity, nanoparticle concentration and flow rate on the collector thermal performance. According to the results, nanofluids promoted the thermal and exergy efficiencies by 33-57% and 13-20%, respectively than the base fluid.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 135, October 2016, Pages 493-505
نویسندگان
, ,