پایان نامه تحلیل عددی ذخیره سازی انرژی گرمایی در مبدل های حرارتی با مواد تغییر فاز دهنده

فهرست:

فصل اول: مقدمه  1

1- 1 مواد تغییر فاز دهنده (PCM) چیست؟. 2

1- 2 تاریخچه استفاده از مواد تغییر فازدهنده 2

1- 3 چگونگی عملکرد مواد تغییر فاز دهنده 2

1- 4 خصوصیات مواد تغییر فازدهنده 4

1- 5 انواع مختلف مواد تغییر فاز دهنده 5

1- 6 فرایند تغییر فاز 7

1- 7 کاربردهای مواد تغییر فازدهنده 9

1-7-1.. کاهش نوسانات دمایی در داخل ساختمان 11

1-7-2.. استفاده از ماده تغییر فازدهنده در سیستمهای خورشیدی 11

1-7-3.. مواد تغییر فاز دهنده و کاربرد آنها در منسوجات.. 12

1-7-3-1 فضانوردی.. 13

1-7-3-2 البسه ورزشی.. 13

1-7-3-3 لوازم خواب.. 13

1-7-3-4 کاربردهای پزشکی.. 14

1- 8 روش های ذخیره انرژی 14

1-8-1. ذخیره انرژی مکانیکی 14

1-8-2.. ذخیره انرژی الکتریکی 14

1-8-3.. ذخیره انرژی گرمایی 14

1-8-4.. ذخیره انرژی ترموشیمیایی 15

1- 9 مواد تغییر فاز دهنده و ذخیره سازی انرژی 15

1-9-1.. بازیافت اتلافات حرارتی در سیستم های تبرید تراکمی 18

1-9-2.. بازیافت اتلافات حرارتی در ساختمانها و گلخانه ها 19

1- 10........................................................................................................................................................................................ روشهای افزایش انتقال حرارت 20

1-10-1............................................................................................................................................................................................................. میکروکانالها 21

1-10-2.................................................................................................................................................................................. مواد افزودنی به مایعات   21

1-10-3.......................................................................................................................................................................................... استفاده از نانو سیال 22

1-10-4............................................................................................................................................................. استفاده از سطوح گسترش یافته 23

1-10-5 استفاده از پره‌های مخلوط کننده 24

1-10-6................................................................................................................................................................. افزایش انتقال حرارت گردابه‌ای 25

1-10-7............................................................................................................................................................................................................................ تزریق 25

1-10-8 مکش 25

1-10-9...................................................................................................................................................... ایجاد انقطاع و شکستگی در جریان 26

1-10-10 نوسان سطح و سیال 26

فصل دوم :  مروری بر کارهای گذشته 27

2-1. بررسی پیشینه کارهای انجام شده 28

فصل سوم  مدل سازی و تحلیل نتایج   43

3-1. مقدمه. 44

3-2. شبیه سازی مسئله. 44

3-2-1.. مقدمه ای بر دینامیک سیالات محاسباتی.. 44

3-2-2.. مقدمه ای بر فلوئنت... 46

3-2-3.. هندسه مسئله. 49

3-2-4 شبکه بندی.. 51

3-2-5.. حل مستقل از شبکه و حساسیت بازه زمانی.. 57

3-3. معادلات حاکم در این تحقیق.. 61

3-3-1.. شرایط مرزی و اولیه. 62

3-4. اعتبار سنجی.. 63

3-5. بررسی نتایج.. 66

3-5-1.. بررسی اثر تعداد پره ها 66

3-5-2  بررسی اثر ارتفاع پره ها 70

3-5-3.. بررسی اثر ضخامت پره ها 74

3-5-4  بررسی اثر جدا نمودن ماده تغییر فاز دهنده توسط پره ها 78

3-5-5.. بررسی اثر تغییرات جنس مبدل.. 82

3-5-6... بررسی اثر تغییرات دمای سیال  86

فصل چهارم: نتیجه‌گیری و پیشنهادات   91

4-1. نتیجه‌گیری.. 92

4-2. پیشنهادات برای ادامه کار 93

مراجع   95

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