نوع مقاله : مقاله پژوهشی

نویسندگان

• مرضیه طبیبی ¹
• سید محمد صفی الدین اردبیلی ²
• محمدجواد شیخ داودی ³

¹ دانش آموخته کارشناسی ارشد مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

² استادیار گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

³ استاد بازنشسته گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

در این پژوهش امکان استفاده از یک سامانه سرمایشی جذبی خورشیدی برای کمک به تامین بار برودتی یک سردخانه مواد گوشتی در شرایط آب و هوایی اهواز مورد مطالعه و ارزیابی قرار گرفت. برای تامین انرژی ورودی این سامانه از انرژی گرمایی حاصل از تابش خورشید، یک جمع کننده سهمی خطی طراحی، ساخت، شبیه‏سازی و مورد آزمایش و ارزیابی قرار گرفت. شبیه­سازی متمرکزکننده نیز با استفاده از داده­های تابشی ناسا برای مکان و زمان آزمایش­ها و بوسیله نرم افزار ترنسیس انجام شد و عملکرد آن در روزهای ماه­های تیر، مرداد و شهریور سال 1398 بررسی و ارزیابی شد. نتایج شبیه سازی سامانه در نرم افزار ترنسیس نشان داد که متمرکزکننده ساخته شده قابلیت تولید سیالی با دمای بالای 98 درجه سلسیوس در ماه­های تیر و مرداد و شهریور دارد. بیشینه انرژی و بازده  متمرکز کننده به ترتیب 318/240 وات-ساعت بر مترمربع و 63/05 درصد بدست آمد. بر اساس محاسبات و ارزیابی انجام شده حداکثر بار برودتی مورد نیاز برای سردخانه مفروض در حدود 126/324 کیلووات برآورد شد. همچنین، مساحت متمرکزکننده لازم برای تامین انرژی ورودی چیلرجذبی 584/687 مترمربع بدست آمد.

کلیدواژه‌ها

• سرمایش خورشیدی
• متمرکزکننده سهموی خطی
• بازده

عنوان مقاله [English]

Feasibility of using solar absorption chillers for food products cold storages in Ahvaz

نویسندگان [English]

• Marzie Tabibi ¹
• Seyed Mohammad Safieddin Ardebili ²
• Mohammad Javad Sheikhdavoodi ³

¹ Student of Master Science, Department of Biosystems Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz,, Iran

² Assistant professor, Department of Biosystems Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

³ Professor, Department of Biosystems Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

چکیده [English]

Introduction Cooling systems such as refrigeration and air conditioning are considered as basics of everyday life. However, the required energy for the above-mentioned applications is mainly generated by non-renewable electricity. Due to the depletion of fossil fuels as a source of electricity, the development of renewable energies for such systems is necessary. Considering all these issues, as cooling needs, most of the time coincides with the solar radiation availability; therefore, exploring solar energy seems an exciting idea. A number of investigations were performed to design/develop new cooling techniques using solar energy. A solar cooling system is capable of considerably reducing the environmental effects of traditional refrigerating machines while allowing significant energy saving. The present work searches for the best choice of configuration/design factors of food refrigeration systems combined with solar-powered absorption chillers unit in Ahvaz as a case study. 
Materials and Methods In the present study, a linear parabolic collector with specific dimensions, was made, so that first, the initial design of the collector with longitudinal dimensions of 1 and a width of 0.6 meters was selected by Katia software, and then using related relations and calculations of other structural parameters based on which the collector was built, the collector simulation was performed using NASA radiation data for the place and time of the experiments and by using the Transient Simulation Software and its performance in the days of the month July, August and September 2019 were reviewed and evaluated. Also, the necessary calculations were performed on the results of performance tests by Excel software, and diagrams of changes in the radiant energy absorbed by the collector and the efficiency of the radiated energy absorbed were drawn from 10:00 AM to 6:00 PM. Using the diagrams obtained from the system simulation in TRNSYS software, it is concluded that the built-in collector has the ability to produce a fluid with a temperature above 98 degrees Celsius required for the absorption chiller in July, August, and September.  
Results and Discussion According to the evaluations of the collector's performance in the three months of July, August, and September from 10 AM to 6 PM showed that collector energy and efficiency reached their maximum values ​​in July with 318.240 w-h/m2 and 63.05 %, respectively. While in August, the amount of energy and efficiency was found to be 299.311 w-h/m² and 61.94%, respectively. The minimum value of the parameters were recorded as 283.379 w-h/m² and 61% in September, respectively. The potential analysis conducted showed an excellent saving potential in terms of energy obtained. According to the results, the useful collector energy was achieved to be 227.664 w-h/m², 217.006 w-h/m², and 210.406 w-h/m² in July, August, and September, respectively. According to the obtained results, the maximum refrigeration load needed for the studied cold storage was about 126324 w. According to the results, the average energy obtained for the collector in the three months of July, August, and September was about 216.054 w-h/m². Finally, the area of the collector was calculated, the results showed that the required surface of the collector was found to be 584.687 m².
Conclusion Solar cooling system for food products cold storage in Ahvaz city is a promising and innovative alternative to decline the peak energy consumption generated by the combustion of fossil fuels, especially during the summer months.

کلیدواژه‌ها [English]

• Solar cooling
• parabolic trough collectors
• performance