نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده آموزش و پرورش، دانشکده سمنگان، سمنگان، افغانستان
2 دانشکده فیزیک دانشگاه تهران
چکیده
هدف در این پژوهش، پایین آوردن دمای فضای زیرشیروانی ساختمان دانشکده فیزیک دانشگاه تهران در فصل تابستان است. برای این کار 18 عدد هواکش خودکار روی سقف شیروانی نصب شدند. به دلیل عدم تأثیر این هواکش‌ها به تنهایی در کاهش اختلاف دمای فضای زیرشیروانی و فضای بیرون، از جریان هوای آرام و تند استفاده شد که در نتیجة اثرات جریان هوای آرام 2-5/1 درجه و جریان تند هوای 8-3 درجه دما کاهش یافت. چون ابعاد اتاق شیروانی بزرگ است (4533 متر مکعب)، به این منظور یک مدل کوچک در حیاط دانشکده با ابعاد (Cm3 33×47×51) طراحی و ساخته شد تا تأثیرات پوشش برگۀ آلومینیوم روی ایرانیت و رنگ کردن ایرانیت به عنوان بازتاب دهنده و نصب یک لایۀ یونولیت زیر ایرانیت به عنوان عایق در کاهش دما، مورد بررسی قرار گیرد. رنگ سفید براق روی ایرانیت 5-3 درجه، پوشش برگه آلومینیوم روی ایرانیت 5/3-2 درجه و لایه یونولیت زیر ایرانیت 2-1 درجه در کاهش دما اثر گذاشتند. دلیل چنین تغییراتی با طیف انعکاس اسپکتروفوتومتری فرا‌بنفش-مرئی-فرو‌قرمزنزدیک توضیح داده شد. همچنین شبیه‌سازی با نرم افزار کامسول نشان میدهد که نصب شش عدد فن در دو انتهای فضای زیر شیروانی با تولید جریان بادی به سرعت m/s 4 منجر به کاهش 10 درجهای دما خواهد شد.
کلیدواژه‌ها
عنوان مقاله [English]
Optimization of energy consumption in the building of department of physics, university of Tehran
نویسندگان [English]
- Wahidullah Enayat 1
- Mohammadreza Mohammadi Zadeh 2
- Massoud Mahjour Shafeie 2
1 Department of Education, Samangan University, Afghanistan
2 Physics department University of Tehran
چکیده [English]
The purpose of this study is to reduce the temperature of the attic of the building of department of physics in university of Tehran. To achieve this goal, eighteen natural ventilators with the area of 0.25 m2 each were installed on the roof. The natural ventilators alone did not decrease the temperature significantly. To help natural ventilation, a laminar flow of air from the floors to the attic was provided. This led to a temperature decrease around 1.5 to 2o C. In addition, a powered ventilation was resulted 3 to 8o C temperature decrease. Since the volume (4533 m3) and area (1416 m2) of the attic are too large, further tests were conducted on two small models (47×33×51 cm3) of the attic, build from the same material as the main attic. The models were used to investigate the effect of covering the roof with aluminum foil and painting the roof with a withe color as a reflector, and installation of polystyrene panels under the roof as an insulator. Covering with aluminum foil, painting in withe, and installation of polystyrene resulted in 3-5, 2-3.5, and 1-2 degrees decrease in temperature, respectively. Reason of these changes was explained by reflection spectrum of UV-Vis-NIR spectrophotometry. Finally, the attic was simulated by the COMSOL Multiphysics software. It showed that a temperature reduction of 10 degrees could be accomplished by installation of six fans as inlet in the gables, three in each gable. Each fan has to generate 4 m/sec air flow velocity.
کلیدواژه‌ها [English]
- energy consumption
- optimization
- aluminum foil
- white color
- polystyrene
- COMSOL
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