بررسی، تحلیل و ارزیابی تجربی میدان مغناطیسی بر عملکرد حرارتی سیستم گردآورنده‌ی خورشیدی سهموی خطی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پردیس علوم و فناوری‌های نوین، دانشگاه سمنان، سمنان، ایران

2 گروه خودرو، دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

3 گروه تبدیل انرژی، دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

چکیده

در پژوهش حاضر، برای بهبود انتقال حرارت گردآورنده‌ی سهموی خطی خورشیدی، یک بار از ذرات آهن در سیال بدون آهنربا و بار دیگر به همراه آهنربا روی لوله جاذب استفاده شد. با استفاده از سیال ‌کاری آب و سیال‌ مغناطیسی در 4 درصد حجمی 2، 2/5، 3 و 3/5 درصد برای لوله جاذب‌ ساده و لوله جاذب با آهنربای دائمی نئودیمیم در جریان آشفته و بر اساس استاندارد اشری 93، آزمایش‌ها انجام شد. راندمان حرارتی برای سیال کاری آب و سیال مغناطیسی در چهار درصد حجمی2، 2/5، 3 و 3/5 درصد، با میانگین رینولدزهای5643، 12987، 13918 و 14845، برای لوله‌ی ساده به ترتیب، 50/6،55/50، 60/55، 56/29 و 70/73 به صورت تجربی اندازه‌گیری و محاسبه شد. همچنین در میانگین‌ رینولدزهای5643، 12987، 13918 و 14845 برای لوله با آهنربا دائمی راندمان حرارتی برای سیال کاری آب و سیال مغناطیسی در چهار درصد حجمی2، 2/5، 3 و 3/5 درصد، به ترتیب، 52/94، 57/69، 62/79، 68/01 و 73/02 به صورت تجربی اندازه‌گیری و محاسبه شد. همانگونه که مشاهده شد با افزایش درصد حجمی سیال مغناطیسی به طور قابل ملاحظه راندمان حرارتی افزایش یافت. همچنین با ایجاد میدان مغناطیسی جذب حرارت افزایش یافت و راندمان حرارتی سیستم گردآورنده‌ی سهموی خطی خورشیدی افزایش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study of the Magnetic Field on the Thermal Performance of the Parabolic Solar Collector System

نویسندگان [English]

  • Sara Vaghf 1
  • Shahaboddin Kharazmi 2
  • Mohammad Sadegh Valipour 3
1 Master of Science in Energy Systems, Faculty of Science and New Technologies, Semnan University, Semnan, Iran
2 Department of Automotive, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
3 Department of Thermal Engineering, Fluid Mechanics, and Energy Conversion, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
چکیده [English]

In the present research, to improve heat transfer in the parabolic solar collector, experiments were conducted using water and magnetic fluid as the working fluids at volume percentages of 2%, 2.5%, 3%, and 3.5% for the simple absorber tube and the absorber tube with a neodymium permanent magnet in turbulent flow, based on ASHRAE Standard 93. The thermal efficiency for water and magnetic fluid at volume percentages of 2%, 2.5%, 3%, and 3.5% was empirically measured and calculated for the simple tube at average Reynolds numbers of 5643, 12987, 13918, and 14845, yielding efficiencies of 50.6%, 55.0%, 60.5%, 65.29%, and 70.73%, respectively. Additionally, for the tube with a permanent magnet, the thermal efficiency for water and magnetic fluid at the same volume percentages was empirically measured and calculated at the same average Reynolds numbers, resulting in efficiencies of 52.94%, 57.69%, 62.79%, 68.01%, and 73.02%, respectively. As observed, with the increase in the volume percentage of the magnetic fluid, the thermal efficiency significantly increased. Furthermore, the creation of a magnetic field enhanced heat absorption, leading to an increase in the thermal efficiency of the parabolic solar collector system.

کلیدواژه‌ها [English]

  • Experimental Investigation
  • Linear Parabolic Collector System
  • Thermal Performance
  • Ferro fluid
  • Magnetic Field

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 57، شماره 8
آبان 1404
صفحه 1013-1036

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