شبیه‌سازی عددی مبدل حرارتی زمین گرمایی مجهز به توربولاتورحاوی نانوسیال هیبریدی دوفاز

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مکانیک، دانشگاه کاشان، کاشان، ایران

چکیده

این مطالعه یک مبدل حرارتی زمین‌گرمایی را به‌صورت عددی با استفاده از دینامیک سیالات محاسباتی شبیه‌سازی کرد. مبدل حرارتی زمین‌گرمایی مجهز به یک توربولاتور و ترکیبی همزمان از توربولاتور و مولد گرداب است که با یک نانوسیال دوفازی نانولولۀ کربنی-مس/آب هیبریدی پر شده است. هندسۀ مبدل حرارتی زمین‌گرمایی با استفاده از Ansys Fluent به‌صورت سه‌بعدی تحلیل می‌شود. به‌منظور مدل‌سازی ویسکوزیته و جریان دوفازی به‌ترتیب از مدل آشفتگی K-Epsilon Realizable و مدل مخلوط استفاده شده است. این مطالعۀ اقلیمی با فرض اقلیم گرم نیمه‌خشک استان اصفهان در عمق 1 متری زمین انجام شد. نتایج به‌دست‌آمده از این مطالعه نشان می‌دهد که با افزایش سرعت ورودی در مبدل حرارتی زمین‌گرمایی و کسر حجمی نانوذرات، عملکرد حرارتی و افت فشار در تمامی مراحل شبیه‌سازی عددی افزایش می‌یابد. همچنین حداکثر عملکرد حرارتی مبدل زمین‌گرمایی هنگام استفاده از ترکیب توربولاتور و مولد گرداب 4 درصد کسر حجمی و عدد رینولدز 32000 است و همچنین شاخص ارزیابی حرارتی-هیدرولیکی در تمامی موارد بیشتر از 1 است. بنابراین استفاده از توربولاتور، ورتکس مولد و ترکیبی از مولد گرداب و توربولاتور به‌طور همزمان در مبدل زمین‌گرمایی ازنظر شاخص معیارهای ارزیابی عملکرد مطلوب است. علاوه‌بر این، افزایش عدد رینولدز در ورودی مبدل حرارتی زمین‌گرمایی باعث افزایش راندمان اگزرژی می‌شود.

کلیدواژه‌ها


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