تحلیل حرارتی دیوار خورشیدی مجهز به ماده تغییر فاز حاوی نانو ذرات

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه سیستان و بلوچستان، زاهدان، ایران

چکیده

در این مقاله تحلیل حرارتی دیوار خورشیدی مجهز به ماده تغییر فاز حاوی نانو ذرات به صورت عددی بررسی شده است. معادله حاکم بر مسئله انتقال حرارت هدایتی گذرا می‌باشد و توسط تکنیک اختلاف محدود بر پایه روش آنتالپی حل شده است. اعتبارسنجی نتایج عددی تحقیق حاضر با داده‌های تجربی تحقیقات گذشته انجام شده است و توافق مناسبی برقرار است. در مطالعات پارامتری تاثیر کسر حجمی نانو لوله‌های کربنی و نانو ذرات کروی اکسید آلومینیوم و اثر تغییر ضخامت ماده تغییر فاز بررسی شده است. نتایج نشان می‌دهد که بهبود مناسبی در عملکرد حرارتی دیوار خورشیدی به واسطه افزودن نانو لوله‌های کربنی و نانو ذرات کروی اکسید آلومینیوم به ماده تغییر فاز پایه حاصل می‌شود. البته نانو لوله‌های کربنی عملکرد بهتری را در اختیار می‌گذارند. دلایل این بهبود شامل افزایش سرعت انتقال حرارت به واسطه افزایش رسانندگی حرارتی و همچنین کامل شدن فرآیندهای ذوب و انجماد در ماده تغییر فاز می‌باشد. برآیند این اتفاقات افزایش راندمان حرارتی دیوار خورشیدی به اندازه 9% برای نانو لوله‌های کربنی با کسر حجمی 3%  است. در کل از نتایج تحقیق حاضر می‌توان برای طراحی یک دیوار خورشیدی مجهز به ماده تغییر فاز با راندمان حرارتی در حدود %40 استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Thermal Analysis of a Solar Wall Equipped to Nano Phase Change Material

نویسندگان [English]

  • Mohsen Irani
  • Faramarz Sarhaddi
  • Amin Behzadmehr
Department of Mechanical Engineering, University of Sistan and Baluchestan, Zahedan, Iran
چکیده [English]

In this paper, the thermal analysis of a solar wall equipped to nano phase change material is carried out, numerically. The governing equation of transient heat conduction is solved by a finite difference technique based on enthalpy method. The validation of numerical results of present study is carried out with the experimental data. There is a fair agreement between numerical results and experimental data. In parametric studies the volume fraction effect of carbon nano tubes and alumina nano particles and the thickness of phase change material is investigated. Present study results showed that suitable improvement in solar wall thermal performance is obtained due to the addition of carbon nano tubes and alumina nano particles to base phase change material. However, carbon nano tubes yield better performance. Performance improvement reasons include the increase of heat transfer speed due to the increase of thermal conductivity and the completion of melting and solidification process. Occurrences resultant leads to a 9% increase in the thermal efficiency of solar wall for 3% volume fraction of carbon nano tubes. Generally, the results of present study give the possibility of the design of a solar wall equipped to phase change material with about 40% of thermal efficiency.

کلیدواژه‌ها [English]

  • Solar wall
  • Phase change material
  • Carbon nano tube
  • Spherical nano particles of alumina

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 51، شماره 4
مهر و آبان 1398
صفحه 131-140

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