مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل انرژی و اگزرژی کلکتور خورشیدی جذب مستقیم سهموی با اصلاح سیال عامل توسط نانولوله‌های کربنی چند دیواره و نانوذرات تیتانیوم دی‌اکسید

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه علم و صنعت ایران
چکیده
تمرکز این پژوهش بر روی مقایسه‌ی اثر استفاده از دو نانوسیال نانولوله‌کربنی چند دیواره عامل‌دار کربوکسیل-آب و تیتانیوم دی‌اکسید-آب در کلکتورهای خورشیدی سهموی جذب مستقیم است. بدین منظور با ساخت دستگاه استاندارد تست عملکرد کلکتور خورشیدی و استفاده از نانوسیالات در غلظت‌های مختلف، بازده حرارتی و بازده اگزرژی کلکتور در هر حالت محاسبه شده است. برای تحلیل خواص تشعشعی نانوسیالات از آنالیز uv/vis استفاده شده است و ضریب هدایت حرارتی آن‌ها نیز اندازه‌گیری شده است. تست‌ها در جریان آرام با دبی‌های 20، 60 و 100 لیتر بر ساعت و دماهای ورودی 20، 30 و 40 درجه سانتیگراد در شرایط واقعی با تابش مستقیم خورشید انجام شده‌اند. بیشترین مقدار بازدهی حرارتی برای نانوسیال کربنی 96/44 درصد و برای نانوسیال تیتانیومی 98/34 درصد گزارش شده است. با توجه به افزایش قابل توجه بازده نسبت به سیال پایه (آب مقطر)، اثر ترکیبی استفاده از نانوسیالات نیز مورد مطالعه قرار گرفته است. بازده حرارتی نانوسیال ترکیبی تا حداکثر 77/48 درصد حاصل شده است. بازده اگزرژی در بیشترین دبی و دمای ورودی برای سیال پایه، نانوسیال حاوی تیتانیوم دی‌اکسید، نانوسیال نانولوله کربنی چند دیواره و نانوسیال ترکیبی برابر با 61/2، 98/4، 68/6 و 26/7 درصد حاصل شده است. مقدار افت فشار تمام نانوسیالات در لوله جاذب بین 5 تا 6/39 پاسکال است. نانوسیالات مورد بررسی، عملکرد گرمایی سیستم را بهبود داده و افت فشار پایینی در سیستم ایجاد می‌کنند که نشان‌دهنده‌ی کارایی بسیار مناسب آن‌ها در کلکتورهای خورشیدی جذب مستقیم است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Energy and Exergy Analysis of a Direct Absorption Parabolic Solar Collector Enhanced with Multi-Walled Carbon Nanotubes and Titanium Dioxide Nanoparticles

نویسندگان English

Amirhossein Edalatpour
Iman Shahdad
S.M. Hosseinalipour
Mahdi Moghimi
Iran University of Science and Technology
چکیده English

This study investigates the comparative effects of carboxyl-functionalized multi-walled carbon nanotube (MWCNT)/water nanofluids and titanium dioxide (TiO₂) /water nanofluids in direct absorption parabolic solar collectors. To achieve this, a standard testing apparatus was constructed, and the thermal and exergy efficiencies of the collector were calculated using nanofluids at various concentrations. UV/Vis analysis was used to analyze the radiative properties of the nanofluids, and their thermal conductivity was also measured. Experiments were conducted under laminar flow conditions with flow rates of 20, 60, and 100 liters per hour and inlet temperatures of 20, 30, and 40 °C under real conditions with direct solar irradiation. The highest thermal efficiency recorded for the carbon-based nanofluid was 44.96%, while the titanium-based nanofluid achieved a thermal efficiency of 34.98%. Given the substantial improvement in efficiency compared to the base fluid (distilled water), the combined effect of using both nanofluids was also examined, resulting in a maximum thermal efficiency of 48.77%. The exergy efficiency at the highest flow rate and inlet temperature for the base fluid, TiO₂ nanofluid, MWCNT nanofluid, and the hybrid nanofluid were 2.61%, 4.98%, 6.68%, and 7.26%, respectively. The pressure drop of all nanofluids in the absorber tube ranged from 5 to 39.6 Pascals. The studied nanofluids enhance the thermal performance of the system and create low pressure drop, indicating their high efficiency in direct absorption solar collectors.

کلیدواژه‌ها English

Solar Collector
Direct Absorption
Nanofluid
Multi-Wall Carbon Nanotubes
Titanium dioxide
Exergy
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