دراسة تأثير محاليل عمل مختلفة على فعالية آلة تبريد امتصاصية شمسية أحادية المرحلة
Abstract
يتناول البحث دراسة تأثير محاليل عمل مختلفة (أسيتون- بروميد الزنك, ماء - بروميد الليثيوم, أمونيا - ثيوسينات الصوديوم, أمونيا – ماء) على فعالية آلة تبريد امتصاصية أحادية المرحلة تعمل بالطاقة الشمسية باستخدام برنامج حاسوبي EES. تم الاعتماد على الخصائص الترموديناميكية لهذه المحاليل وعلى معادلات توازن الطاقة والحرارة وانتقال الكتلة لكل من مكونات الدارة, كما تم إجراء مقارنة لأداء هذه الدارات عند شروط حرارية مختلفة لكل من المولد والمبخر والمكثف.
بينت النتائج أن دارة أسيتون- بروميد الزنك تعطي أداء أفضل من دارة ماء - بروميد الليثيوم , بينما تعطي دارة أمونيا - ثيوسينات الصوديوم أداءً أفضل من دارة أمونيا - ماء. يزداد معامل الأداء لكل دارة مع ازدياد كل من درجة حرارة المولد والمبخر. يسبب ازدياد درجة حرارة المكثف انخفاضاً في أداء النظام لجميع الدارات.
تساعد هذه النتائج في اختيار ظروف التشغيل للنظم القائمة وتحقيق التشغيل الأمثل لها.
This study discusses the effect of different working solutions (acetone–zinc bromide, water- lithium bromide, ammonia-sodium thiocyanate, ammonia- water) on the efficiency of single stage solar absorption refrigeration machine using a computer simulation model EES. The model is based on thermodynamic properties for these working fluids and on detailed mass and energy balance and heat and mass transfer for the cycle components. The performances of these four cycles against various generator, evaporator, and condenser temperatures are compared.
The results show that the acetone–zinc bromide cycle gives better performance than the water- lithium bromide cycle. The ammonia-sodium thiocyanate cycle gives better performance than the ammonia- water. Increasing generator temperatures and evaporator cause are increasing in system performance for each cycle. Increasing condenser temperatures cause a decrease in system performance for each cycle.
These results can be used in selecting operating conditions for existing systems and for maintain optimum operation of the system.
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