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فصلنامه علمی کارافن

شبیه‌سازی عددی طرحی نو از بادگیر مشتمل بر مواد تغییر فاز دهندۀ کپسوله و بررسی اثر پارامترهای مختلف بر عملکرد حرارتی آن

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان
استادیار، گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران.
چکیده
با توجه به اهمیت صرفه‌جویی در مصرف انرژی به‌ویژه برای تأمین شرایط آسایش در ماه‌های گرم سال و همچنین توجه به این نکته که بادگیر به‌تنهایی قادر به سرمایش هوا نبوده و از طرفی مواد تغییر فاز دهنده ظرفیت بالایی در ذخیره‌سازی انرژی گرمایی را دارا هستند، در این پژوهش طرحی نو از بادگیر مشتمل بر مواد تغییر فاز دهنده کپسوله مورد مطالعه قرارگرفته و اثر  قطر و میزان استفاده از ذرات کپسوله تغییر فاز دهنده و همچنین تخلخل و نوع ماده تغییر فاز دهنده بر عملکرد حرارتی مدل پیشنهادی بررسی ‌شده است. بررسی‌ها برای 7 هندسه متفاوت و 3 نوع ماده تغییر فاز دهنده مختلف در حالت سه‌بعدی و غیر دائم  انجام ‌شده ‌است. نتایج نشان داد که طرح پیشنهادی در مقایسه با بادگیرهای رایج عملکرد حرارتی بسیار مطلوب‌تری دارد همچنین کاهش تخلخل و افزایش قطر ذرات کپسوله، کاهش دمای میانگین خروجی و بهبود عملکرد حرارتی سیستم را به همراه دارد. علاوه این نتایج نشان داد هرچه میزان مواد تغییر فاز دهنده کپسوله در بادگیر بیشتر باشد عملکرد حرارتی آن مطلوب‌تر است. البته موجبات افت فشار خروجی را به همراه دارد. درنهایت نتایج بررسی برای نوع ماده تغییر فاز دهنده نشان داد که استفاده از ماده تغییر فاز دهنده ترکیبی SP-28 به دلیل خواص بهبودیافته و ثبات دمایی ایجادشده، در مقایسه با هیدارت نمکیCacl2.6H2o  و پارافین RT21HC  به ترتیب 88/5 % و82/8% افزایش راندمان حرارتی مدل پیشنهادی را به همراه دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Simulation of a New Design of the Windcatcher Containing Encapsulated Phase Change Materials and Investigating the Effect of Different Parameters on its Thermal Performance

نویسندگان English

Ehsan Mehrabi Gohari
Moslem Mohammadi Soleymani
Assistant Professor, Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran.
چکیده English

Considering the importance of saving energy consumption, particularly for providing comfortable conditions in the hot months of the year, and also paying attention to the fact that the wind catcher alone is not able to cool the air, and phase change materials have a high capacity in storing thermal energy. In this research, a new design of windcatcher containing encapsulated phase change materials was studied and the effect of diameter and amount of phase change particles as well as porosity and type of phase change material on the thermal performance of the proposed model was investigated. Investigations were carried out for 7 different geometries and 3 different types of phase change materials in a three-dimensional and unsteady simulation. The results showed that the proposed design has a better thermal performance compared to the usual windcatcher. The reduced porosity and increased diameter of the capsule particles decreased the average outlet temperature and improved the thermal performance of the system. In addition, the results showed that the higher the amount of capsule phase change material in the windcatcher, the better its thermal performance although it also caused a drop in outlet pressure. Finally, the results of the investigation for the type of phase change material showed that the use of SP-28 combined phase change material compared to Cacl2.6H2o salt hydrate and RT21HC paraffin increased the thermal efficiency by 5.88% and 8.82%, respectively due to its improved properties and temperature stability.

کلیدواژه‌ها English

Phase Change Material
Windcatcher
Thermal Performance
Porosity
Particle Encapsulation
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دوره 21، شماره 1 - شماره پیاپی 66
فنی و مهندسی
بهار 1403
صفحه 509-532

  • تاریخ دریافت 26 خرداد 1402
  • تاریخ بازنگری 07 آذر 1402
  • تاریخ پذیرش 10 دی 1402