مطالعۀ عملکرد حرارتی و هیدرودینامیکی یک کلکتور خورشیدی سهموی خطی با استفاده از نانوسیال هیبریدی نانولوله‌های کربنی چنددیواره/اکسید آهن– ترمینول وی پی 1

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه کاشان

چکیده

در مطالعۀ حاضر به‌صورت تئوری بر مبنای یک مدل حرارتی به بررسی عملکرد یک کلکتور سهموی خطی با استفاده از نانوسیال هیبریدی و مقایسۀ آن با مونو نانوسیال و سیال پایه پرداخته شده است. از ترمینول وی پی 1 به‌عنوان سیال پایه و از نانوذرات اکسید آهن برای تولید مونو نانوسیال و از نانوکامپوزیت نانولوله‌های کربنی چنددیواره- اکسید آهن به‌عنوان ذرات نانو برای تولید نانوسیال هیبریدی استفاده شده است. جریان سیال داخل لولۀ جاذب کلکتور به‌صورت مغشوش فرض شده است. نتایج نشان داد که وقتی از نانوسیال هیبریدی و مونو نانوسیال استفاده می‌شود، راندمان‌های انرژی و اگزرژی کلکتور نسبت به شرایط استفاده از سیال پایه بیشتر هستند، ولی مقدار آن‌ها با استفاده از نانوسیال هیبریدی اندکی کمتر از شرایطی است که سیال عامل مونو نانوسیال باشد. بیشترین افزایش راندمان انرژی کلکتور برای نانوسیال هیبریدی و مونو نانوسیال نسبت به سیال پایه به‌ترتیب برابر با 17/2% و 22/2% و بیشترین میزان افزایش راندمان اگزرژی به‌ترتیب برابر 49/1% و 58/%1 به دست آمد. با وجود این ضریب اصطکاک مونو نانوسیال نسبت به نانوسیال هیبریدی به‌طور متوسط حدود 7% بیشتر به دست آمد. نتایج نشان داد که معیار ارزیابی عملکرد کلکتور (بازده حرارتی- هیدرودینامیکی) وقتی از نانوسیال هیبریدی استفاده شود، بیشتر از شرایطی است که از مونو نانوسیال استفاده شود.

کلیدواژه‌ها


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