تحلیل انرژی عملکرد گردآورند PV/T مجهز به صفحه‌پره‌دار

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه آموزشی مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه تبریز

چکیده

چکیده
در این پژوهش تجزیه و تحلیل انرژی روی عملکرد گردآورنده حرارتی-فتوولتائیک (PV/T) مجهز به­صفحه‌پره‌دار با سیال خنک‌کننده هوا مورد بررسی قرار گرفت. از یک گردآورنده خورشیدی PV با همان مشخصات البته بدون سیال خنک­کننده برای مقایسه نتایج به­دست آمده بهره گرفته شد. هم­چنین از یک فن با دبی033/0 کیلوگرم‌ بر ثانیه برای ایجاد جریان همرفت اجباری استفاده گشت. در قسمت تحتانی مجرای هوا، یک صفحه با پره‌های ذوزنقه‌ای شکل به‌منظور ایجاد جریان آشفته در کانال هوا و افزایش ضریب انتقال حرارت بین صفحه جاذب و سیال هوا نصب شد. برای ثبت دما در مجرای هوا از 6 عدد حس‌گر حرارتی LM35 که برنامه‌نویسی آن‌ها توسط نرم‌افزار آردینو صورت گرفته بود استفاده گردید. محاسبات تئوری با استفاده از روش کدنویسی در نرم‌افزار متلب صورت گرفت.  نتایج نشان داد استفاده از سیال هوا، کاهش دمای سلول‌های خورشیدی و در نتیجه افزایش ولتاژ خروجی گردآورنده PV/T را به­میزان حدود 9% در تمامی ساعات آزمایش نسبت به­سیستم شاهد (PV) به‌دنبال داشت. بازدهی حرارتی PV/T در کار تجربی و تئوری به‌ترتیب47% و 51% محاسبه گشت. هم­چنین اختلاف دمای هوای خروجی کار تجربی با تئوری حدود 8% برآورد شد و حداکثر اختلاف دمای هوای خروجی در کار تجربی و تئوری با دمای محیط به‌ترتیب 06/7 و 25/10 و حداقل دما به‌ترتیب 4/1 و 97/2 درجه سلسیوس به­دست آمد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Thermal Performance Analysis of a Photovoltaic/Thermal (PV/T) Solar Collector with Fins

نویسندگان [English]

  • Ahmad Moradi
  • Yahya Ajabshirchi
  • Ali Deliran
Department of Biosystems Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
چکیده [English]

Abstract
In this study, the energy analysis of an air-cooled photovoltaic-thermal (PV/T) equipped with fins was investigated. A PV panel with the same characteristics without cooling fluid was used to compare the results as the control system. A fan with air flow rate of 0.033 kg s-1 was used to create forced convection flow. In the lower part of the air channel, a plate with trapezoid fins was mounted to create turbulent flow in the air channel to increase the heat transfer coefficient between the plate and air fluid. Six temperature sensors LM35 were used to record air temperature and a computer program in MATLAB was developed to compute the theoretical performance. The results showed that the use of air flow reduces the temperature of solar cells and thus increases the PV/T output voltage by about 9% over all hours of the experiment compared to the control system (PV). The theoretical and experimental thermal efficiency of the PV/T was calculated as 0.51 and 0.47, respectively. Also, the average difference between theoretical and experimental temperature was about 8%. The maximum difference between air outlet temperature and ambient temperature in measured and predicted were 7.06 and 10.25, respectively, and the minimum differences were 1.40 and 2.97, respectively.
 

کلیدواژه‌ها [English]

  • Keywords: Photovoltaic/Thermal collector
  • Photovoltaic panel
  • Solar energy
  • Thermal efficiency
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