بررسی عملکرد هیدرولیکی- حرارتی، بازده انرژی و اگزرژی در کلکتور خورشیدی مجهز به مولد گردابه حاوی نانوسیال هیبریدی دوفازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

2 دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

3 گروه مهندسی شیمی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

چکیده

خورشید یک منبع تجدیدپذیر است که به کاهش انتشار دی‌اکسید کربن کمک کرده و تأثیر صنایع را بر آلودگی طبیعت کم می‌کند. در مطالعۀ حاضر با روش عددی و با کمک روش حجم محدود به بررسی تأثیرات استفاده از مولد گردابه در حالت‌های مختلف هندسی در لولۀ جاذب کلکتور خورشیدی سهموی پرداخته شد. همچنین نانوسیال هیبریدی آب/اکسید آهن-نانولولۀ کربنی با در نظر گرفتن مدل دوفازی در اعداد رینولدز 24000 تا 96000 به‌عنوان سیال انتقال حرارت مورد استفاده قرار گرفت. مولدهای گردابه با چهار حالت هندسی Case A، Case B، Case C و Case D مدل‌سازی شده و تأثیر آن‌ها بر پارامترهای مختلف در خروجی کلکتور خورشیدی سهموی بررسی شد. نتایج به‌دست‌آمده نشان داد به‌کار‌گیری مولد گردابه‌ها باعث بالا رفتن ضریب انتقال حرارت و درنتیجه افزایش بازده حرارتی در کلکتور خورشیدی سهموی شد. افزایش نسبت پیچش مولد گردابه میزان اثربخشی و بازده انرژی را در کلکتور خورشیدی سهموی افزایش داد. مطلوب‌ترین میزان بازده انرژی در عدد رینولدز 96000 و هنگام استفاده از مولد گردابه با شکل هندسی Case D رخ داد. مطلوب‌ترین میزان بازده اگزرژی در عدد رینولدز 48000 و هنگام استفاده از مولد گردابه با شکل هندسی Case D بود. بیشترین میزان افزایش عملکرد حرارتی به‌میزان 03/65 درصد نسبت به زمانی که کلکتور خورشیدی سهموی ساده بود، افزایش پیدا کرد.

کلیدواژه‌ها

موضوعات


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