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Register a new userAnalyzing of Convection Heat Transfer in Absorber Tube of Direct Steam Generation Parabolic Trough Collector (DSG-PTC)
تحليل الإنتقال الحراري بالحمل في الأنبوب الماص لمركز شمسي قطعي يستخدم لتوليد البخار بشكل مباشر
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اكتسب توليد البخار بشكل مباشر في المركزات الشمسية القطعية أهمية كبيرة في الأونة الأخيرة نظرًا لميزاته الترموديناميكية و الإقتصادية و تعددت الأبحاث في هذا المجال, نظرًا لذلك تم في هذا البحث دراسة الإنتقال الحراري بالحمل من الأنبوب الماص لهذا المركز إلى الماء المار داخله في أطواره الثلاث المائع و البخار المشبع الرطب و البخار الجاف بشكل تفصيلي على طول مركز قطعي ثابت الطول يقوم بتوليد بخار محمص ذو درجة حرارة عالية (561 °C). تم نمذجة كافة عمليات الإنتقال الحراري في المركز ثم دراسة معدل إنتقال الحرارة بالنسبة لواحدة الطول من ناحية تغير درجة حرارة السائل و فرق درجة الحرارة بين معدن الأنبوب و هذا السائل و تغير معامل الإنتقال الحراري بالحمل و ذلك عند تغير ظروف التشغيل من ضغط السائل تدفقه الكتلي شدة الإشعاع الشمسي المباشر الهابط على المركز.
Direct steam generation in parabolic trough collector (DSGPTC) has had a great importance because of its thermoeconomic advantages and many researches have be done in this field. Due to that reason this paper studies the convection heat transfer from absorber tube of a PTC to all phases of water (liquid water, wet steam and dry steam) along the whole distance of fixed length of a DSG-PTC generates a high temperature superheated steam (561 °C). All heat transfer operations in PTC has been modelled and then the convection' components which are; fluid temperature, tube wall-fluid temperatures difference and heat transfer coefficient have been analyzed in details at different operation conditions such as inlet fluid pressure, direct solar beam and mass flow.
References used
Price H. Lu¨pfert E. Kearney D. Zarza E. Cohen G., Gee R., Mahoney R. 2002 Advances in Parabolic Trough Solar Power Technology Journal of Solar Energy Engineering, Vol. 124 / 109-125
Dudley VE, Kolb GJ, Sloan M, Kearney D. Test results: SEGS LS-2 solar collector, Report SAND94-1884, Sandia National Laboratories, Albuquerque, NM; 1994
Kreith F. Goswami D.Y. 2007 - Handbook of Energy Efficiency and Renewable Energy. CRC press, 1st Ed, New York, 1586
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