STUDY THE EFFECT OF USING DIFFERENT TYPES OF TWISTED TAPES ON THERMAL PERFORMANCE IN SOLAR COLLECTOR

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

The goal of this research is to study experimentally the effect of the use of twisted aluminum strips as turbulence promoters on the heat transferin terms of Nusselt number (Nu), the pressure drop in terms of the friction factor (ƒ),the thermal performance factor TPF and the efficiency (η) of the flat plate solar collector. This research focuses with process of energy conversation under steady-statestatusin the laminar flow situation for water as the working fluid. Experimental side includes design and constructuion of a simple solar collector (flat plate type) and four different kind sof twisted strips include curvatures and straight vortex generators (VGs) and twist ratio isY=2 (twisted tape with generator in front flow TTFF, twisted tape with curvature vortex generator in opposite flow TTOF, twisted tape with straight vortex generator TTS and typical twisted tape TT), dimensions of the vortex generator 2mm high and 1mm thick.The measuring instruments used in this experiment were solar irradiance meter, volumetric flowmeter, manometer, temperature record meter, and temperature sensors. The experiments are carried out in Babal, Iraq with latitude 32 ̊,13ˊ,27 N and longitude 44 ̊,22ˊ,36 E, the volumetric flow rates used are (7, 5,3 and 1.5) L / min .The experimental result showed that the decrease in flow rate was found to increase the variation in temperature of the water between the exit and the inlet of tubes fitted with twisted tape, the higher difference in temperature was (18.3 ° C) in tubes fitted with TTFF at volumetric rate 1.5 liter/ minuteand the maximum outlet temperature of the fitted tube (TTFF) was 98 ° C for 1.5 L / min.Also, thermal transfer rate in term number of Nusselt (Nu) and pressure dropin term factor of friction (ƒ) improved compared to other cases in the tube fitted with (TTFF),the Nusselt Number for riser tube equipped with (TTFF) enhanced to 31%,38.2%,40%, and 54.2% compared with the smooth tube at laminar flow with NumberofReynolds range (300<Re< 2000) respectively also the factor of friction increases with number of Reynolds Re decreases and for higher friction factor is achieved in the tube equipped with (TTFF, TTOF,and TTS) comparison with (TT) and plaintube, the parameter (ƒ) in the tube equipped with TTFF increases by about 18% to 30% above the plain tube. The empirical data also revealed the TPF thermal performance ratiofor TTFF was higher than the other twisted tapes with the same pumping capacity, the maximum thermal performance factor was 1.4 and the maximum efficiency of the TTFF tube was 64.7%.

روابط وملفات

التعريف والنوع

رقم الوثيقة

067cef15-0d93-4deb-99c8-a59d98679213

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf image

أسماء الملفات

067cef15-0d93-4deb-99c8-a59d98679213_1.pdf

بيانات النشر

ترجمة العنوان

دراسة تأثير أنواع مختلفة من الاشرطة الملتوية على الأداء الحراري للمجمع الشمسي

ألقاب المؤلفين

[{"name_ar":"أحمد هاشم يوسف","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"علي شاكر باقر","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"علي مجيد عبدالكريم","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

STUDY THE EFFECT OF USING DIFFERENT TYPES OF TWISTED TAPES ON THERMAL PERFORMANCE IN SOLAR COLLECTOR

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

أحمد هاشم يوسف, علي شاكر باقر

الإعداد

علي مجيد عبدالكريم

الاقتباسات الببليوغرافية