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Register a new userControlling the Flow of Conditioning Liquid and Return air to Reduce the Electrical Energy Consumption of HVAC Systems
التحكم بتدفق سائل التكييف و الهواء الراجع لخفض استهلاك أنظمة التكييف المركزية من الطاقة الكهربائية
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Added by
Tishreen University ورقة بحثية
Publication date
2013
fields
Electrical Power Engineering
and research's language is
العربية
Created by
Shamra Editor
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تعدّ إعادة استخدام الهواء الراجع في أنظمة التكييف المركزية من أهم الإجراءات الموفرة لاستهلاك الطاقة الكهربائية, إلا أن حاجة الأشخاص الموجودين ضمن الحيز المكيف للهواء النقي يفرض تحديد عدد مرات استخدامه. يهدف هذا البحث إلى ربط عمل نظام التكييف (التدفئة) لمنشأة ما بعدد الأشخاص الموجودين ضمنها, و ذلك عن طريق تعديل نسبة مزج الهواء الراجع و الهواء الخارجي بهدف ترشيد استهلاك الطاقة الكهربائية, و رفع درجة حرارة المزيج الهوائي عن طريق التحكم بتدفق الماء الساخن بشكل مستمر, و ليس بطريقة الفتح و الإغلاق المتبعة سابقا, و ذلك بهدف الاستجابة لأي تغيير في عدد الأشخاص, و التخلص من الإقلاعات المتكررة للمعدات. تم إنجاز بحثنا باستخدام أنموذج فيزيائي تم إعداده خصيصاً, مكون من غرفة اختبار و حساسات حرارة و حركة و مضخة و خزان ماء و مبادل حراري و شفرات خلط الهواء. تعمل هذه الأجهزة بقيادة متحكم PIC16F877A . أظهرت النتائج التي حصلنا عليها تجريبيا إمكانية التحكم بكمية الهواء الراجع تبعا لعدد الأشخاص و التحكم بسرعة المضخة بشكل مستمر مع توفير في استهلاكها للطاقة الكهربائية يصل إلى 68% بالمقارنة مع حالة العمل عند السرعة الكاملة.
The re-use of return air in central conditioning systems is one of the most important procedures for saving power consumption. However, the requested fresh air of the people existed within the conditioning space imposes determining the number of times to be used. This research aims to link the work of the central conditioning system (heating) of a facility with the number of people existing within this facility by modifying the ratio of mixed fresh air and return air to save the electrical power consumption. Also, to raise the temperature of the mixture air by controlling the flow of hot water continuously rather than using on-off technique. As well as, to respond to any change in the number of people and get rid of repeated machine starting. Our research has been done by using specialized physical model consisted of test room, heat and movement sensors, pump, water tank, heat exchanger and air mixing blades. These devices are controlled by microcontroller type PIC16F877A. The experimentally obtained results showed the ability of controlling the amount of return air depending on the number of people and controlling the speed of the pump continuously providing a saving of electrical energy consumption up to 68% compared with the case of full speed.
References used
RESTREPO, A.; GONZÁLEZ, A.; ORDUZ, S. Cost effective control strategy for small applications and pilot plants: on–off valves with temporized PID controller. Chemical Engineering Journal, 2002, pp.101–107
Riederer, P. From sizing and hydraulic balancing to control using the simbad toolbox. Eighth International IBPSA Conference, 2003, pp.1101-1108
ZAHEER, M.; TUDOROIU, N.; Neuron-PID tracking control of a discharge air temperature system. Science Direct, Canada, 2004, pp.2405-2415
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