مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی تاثیر استفاده از لوله مواج و پره تسمه‌ای در بهبود نرخ انجماد در سامانه ذخیره‌سازی یخ روی کویل

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشگاه شهید بهشتی
2 دانشگاه شهید یهشتی
چکیده
ذخیره­ سازی انرژی راه ­حل مشکل ناسازگاری میان زمان عرضه و تقاضا است. ذخیره سرمایشی، از جمله سامانه­های ذخیره­ساز انرژی می­باشد. یکی از معایب این نوع ذخیره­ سازها، نرخ پایین انتقال حرارت است که معمولاً ناشی از هدایت پایین ماده تغییر فاز دهنده و یا بازده پایین اجزاء سامانه می‌باشد. در این مقاله به­صورت تجربی به تاثیر استفاده از پره‌های تسمه‌ای در مقایسه با استفاده از لوله موج‌دار در بهبود نرخ تشکیل یخ در سامانه ذخیره سازی یخ روی کویل پرداخته شده است. مقایسه ضخامت یخ بدست آمده در دو حالت گواه بیشتر بودن کارایی لوله ­موج­دار می‌باشد. از مهم­ترین نتایج به­دست آمده می­توان به افزایش 08/21 % حجم یخ تشکیل شده در استفاده از کویل مسی موج­دار اشاره کرد. همچنین، میزان مصرف برق برای تولید هر لیتر یخ در حالت استفاده از لوله موج­دار 62/0 کیلووات ساعت و برای لوله تسمه دار 72/0 کیلووات ساعت می‌باشدکه نشانگر برتری روش استفاده از لوله موجدار می‌باشد. همچنین، نتایج حاکی از آن است که در حالت لوله ­موج­دار در برآمدگی­ها ضخامت یخ تشکیل شده در زیر لوله نسبت به روی لوله بیشتر است، این در حالی است که این مساله در فرورفتگی­ها برعکس است و ضخامت یخ در ناحیه روی لوله حدود 25% از ضخامت یخ زیر لوله بیشتر است. در ضمن، در دو حالت، ضخامت یخ در انتهای آزمایش در راستای عمودی و راستای افقی کمتر از 1% تفاوت دارند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental study of the effect of using wavy pipes and pipe with straps fins on the improvement of the ice formation rate in ice-on-coil thermal storage systems

نویسندگان English

sanaz kashani 1
Hamid Jannesari 1
Sahand Majidi 2
1 Shahid Beheshti University
2 Shahid Beheshti University
چکیده English

Cold storage is a commonly used form of the energy storage systems. A major drawback in this type of energy storage is its low heat-transfer rate caused by the low thermal conduction of the phase change material and/or inefficiency of the components utilized in the thermal system. In the present experimental research, straps fins are used to improve the solidification rate of an ice storage system equipped with coiled tubes. Furthermore, the effect of employing straps fins in improving the ice-formation process is compared to that of the strorage system equipped with wavy coil tubes. The results indicate that wavy tube demonstrate a superior performance in increasing the ice formation rate. Comparing the ice-thicknesses obtained from using either of these methods approves the better peoformance characterstics of the wavy tubes. Employing wavy tubes is shown to increase to stored ice volume by 21.08% compared to the use of straps fins. The required power consumption per one liter of ice produced in the system equipped with straps finned tube and wavy coil tube is 0.72 kWh and 0.62 kWh, respectively. Also, in the crest area of the wavy tube configuration, the ice formed on the lower tube surface is generally thicker than that on the upper tube surface. The ice formation behaviour is opposite in the troughs where the ice thickness on the upper surface is 25% higher that on the lower surface. Finally, the difference in the ice thicknesses measured in horizontal and vertical directions is less than 1%.

کلیدواژه‌ها English

Cold storage
straps fins
wavy pipe
secondary flow
Experimental Study
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