توزيع الرغوة المعدنية شبه المنتظم في المجمع المكافئ: نهج تجريبي لتحسين الأداء الحراري في ظل الظروف الجوية العراقية
محتوى المقالة الرئيسي
الملخص
في العمل الحالي، تم التحقيق تجريبيًا في تأثير الرغوة المعدنية على الكفاءة الحرارية لمجمع الطاقة الشمسية ذو القطع المكافئ (PTC) باستخدام نوعين من المستقبلات: واحدة تحتوي على إدخالات من الرغوة المعدنية (MFI) والأخرى بدونها. تم إجراء الاختبارات باستخدام نسبة ملء 30% (FR) من كتل الرغوة النحاسية، تتألف من 10 أقراص، كل منها بسمك 45 مم، موزعة بشكل شبه موحد على طول أنبوب المستقبل. كانت الرغوة النحاسية ذات كثافات مسامية تتراوح بين 10 و40 PPI ومسامية تبلغ 0.903 و0.8983. تمت التجارب وفقًا لمعايير ASHRAE 93، مع تغيير معدلات التدفق من 0.1 إلى 0.3 لتر/دقيقة، باستخدام الماء كوسيط لنقل الحرارة. أجريت التجارب في العراق في مايو 2024، من الساعة 9:00 صباحًا إلى 4:00 مساءً، تحت ظروف إشعاع شمسي. لضمان موثوقية البيانات، تم إجراء تحليلات للشكوك على درجة الحرارة، والإشعاع الشمسي، ومعدل التدفق، وفقدان الضغط. أشارت النتائج إلى أن استخدام الرغوة المعدنية في المستقبل حسن من كفاءة المجمع، مع زيادة ملحوظة قدرها 16.74% عند 40 PPI و0.3 لتر/دقيقة. تم تحقيق أعلى كفاءة حرارية مع 40 PPI، مما رفع درجة حرارة مخرج PTC إلى 58 درجة مئوية عند 0.1 لتر/دقيقة، مقارنة بـ 53 درجة مئوية للأنبوب بدون رغوة. وفقًا لمعايير تقييم الأداء، تتفوق رغوة 10 PPI على رغوة 40 PPI. وبالمقارنة مع رغوة 40 PPI الأكثر كثافة، تعمل مسام 10 PPI الأكبر على تحسين تدفق المياه وتقليل المقاومة وتتطلب طاقة أقل لضخ سائل نقل الحرارة (HTF). ومع ذلك، وجدت النتائج أنه رغم أن الرغوة المعدنية تحسن من كفاءة نقل الحرارة، فإنها تزيد من فقدان الضغط، مما يبرز أهمية موازنة هذه العوامل في تصميم النظام.
تفاصيل المقالة
القسم
كيفية الاقتباس
المراجع
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