التوزیع المکانی للترکیزات الداخلیة للغازات الدفیئة والأمونیا فی مبنى لماشیة اللبن مهوى طبیعیا

نوع المستند : Original Article

المؤلفون

1 أستاذ مساعد، قسم الهندسة الزراعیة، قسم الهندسة الزراعیة، کلیة الزراعة - جامعة القاهرة، مصر.

2 مدرس، قسم تطبیقات اللیزر فی المقاییس، الکیمیاء الضوئیة والزراعة، المعهد القومى لعلوم اللیزر - جامعة القاهرة، مصر.

3 أستاذ مساعد، قسم التطبیقات الهندسیة للیزر، المعهد القومى لعلوم اللیزر - جامعة القاهرة، مصر.

المستخلص

تشکل مبان الماشیة مصدرا رئیسیا للانبعاثات الغازیة مثل الأمونیا (NH3) والمیثان (CH4) وثانی أکسید الکربون(CO2)  وأکسید النیتروز(N2O) . إن تحدید التوزیع المکانی للترکیزات الغازیة فی الأماکن المغلقة مهمة صعبة للغایة. لذلک تهدف هذه الدراسة إلى دراسة الترکیزات الداخلیة لکل من NH3، والمیثان، وثانی أکسید الکربون، وأکسید النیتروز وتحلیل توزیعها المکانی. حیث أجریت قیاسات مستمرة للترکیزات الغازیة الداخلیة فی مبنى لماشیة الألبان مهوى طبیعیا. وقدرت معدلات التهویة وتم تحدید معدلات الانبعاث. ونتیجة لذلک، تمت مقارنة النتائج مع بعضها البعض من خلال إجراء تحلیل الارتباط والانحدار لتطویر الدوال التی تقدر العلاقات بین هذه الغازات. تم إجراء اختبار t متعدد لجمیع الغازات للکشف عما إذا کانت الترکیزات الداخلیة فی نقاط القیاس المختلفة تختلف اختلافا کبیرا عن بعضها البعض. وقد أجری تحلیل الحساسیة لتقییم تأثیر عدم الیقین فی الافتراضات الفردیة على النتائج الإجمالیة لمعدلات التهویة والانبعاث.  وأظهرت النتائج أن التوزیع المکانی للترکیزات الغازیة فی الأماکن المغلقة لیس موحدا، حیث کانت الترکیزات فی الجانب الجانبی (الغیر مواجه لاتجاه الریاح) للمبنى أعلى بکثیر من الترکیزات فی الجانب المواجه لاتجاه الریاح. وکانت معاملات الانبعاث هی 1,8 و 10,2 و 351 و 0,1 جم. س -1 وحدة حیوانیة -1 بالنسبة إلى کل من  NH3 و CH4 و CO2 و N2O  على التوالی.

الكلمات الرئيسية

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