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ارزیابی مبتنی بر شبیه‌سازی یک دودکش خورشیدی نصب‌شده روی دیوار برای پشتیبانی فصلی سامانه‌های تهویه مطبوع و بهره‌وری انرژی در گلخانه‌ها: مطالعه موردی در اهواز، ایران | ||
| مهندسی بیوسیستم ایران | ||
| دوره 55، شماره 3، مهر 1403، صفحه 87-108 اصل مقاله (2.71 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2025.388520.665581 | ||
| نویسندگان | ||
| سید مجید سجادیه* ؛ عیاد صابریان | ||
| گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| چکیده | ||
| این پژوهش عملکرد فصلی دودکش خورشیدی دیواری یکپارچه با سامانه تهویه مطبوع برای کنترل اقلیم گلخانه در اهواز را ارزیابی می‌کند. با استفاده از مدل‌های معتبر دینامیک سیالات محاسباتی، عملکرد سرمایشی، تهویه‌ای و گرمایشی سامانه در یک دوره 9 ماهه و با در نظر گرفتن تغییرات دما، تابش خورشیدی و تجهیزات حرارتی یک گلخانه سقف شیروانی دوتایی با ابعاد ۱۲×۲۰ مترمربع و ارتفاع تاج ۶ متر، تحلیل شد. نتایج نشان داد که در ماه‌های گرم سال، این سامانه دماهای داخلی را 13 تا 17 درجه سلسیوس کاهش داد، اما بازده سرمایشی (56/0در برابر 62/0)، نرخ تعویض ساعتی هوا (82/3 در برابر 01/9) و شاخص یکنواختی دما (73/0 در برابر 82/0) آن در مقایسه با سامانه متعارف فن-پد کمتر بود. با این حال، حذف توان محوری فن منجر به صرفه‌جویی قابل‌توجه انرژی شد. همچنین در ماه‌های سرد سال، دما را به میزان 24/6 درجه سلسیوس افزایش داد و شاخص یکنواختی دما را از 74/0 به 89/0 ارتقا داد، هرچند بازده گرمایشی آن 43/0 و کمتر از انتظار بود. این نتایج نشان می‌دهد که این سامانه، به ویژه در دوره‌های گرمایشی می‌تواند با صرفه‌جویی در انرژی و ارائه کنترل اقلیم مؤثر، جایگزینی پایدار برای سامانه‌های متداول باشد. بهینه‌سازی طراحی، مانند استفاده از پرده‌های حرارتی و سقف‌های موقت در ماه‌های سرد، می‌تواند عملکرد آن را بیشتر بهبود دهد. | ||
| کلیدواژه‌ها | ||
| دودکش خورشیدی برای سیستم تهویه مطبوع؛ دینامیک سیالات محاسباتی؛ سیستم‌های گلخانه‌ای کم‌مصرف انرژی؛ عملیات پایدار گلخانه‌ای؛ کنترل اقلیم گلخانه | ||
| عنوان مقاله [English] | ||
| Simulation-Based Evaluation of a Wall-Mounted Solar Chimney for Seasonal HVAC Support and Energy Efficiency in Greenhouses: A Case Study in Ahvaz, Iran | ||
| نویسندگان [English] | ||
| Seyed Majid Sajadiye؛ Ayad Saberian | ||
| Department of Biosystems Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| چکیده [English] | ||
| This study evaluates the seasonal performance of a wall-integrated solar chimney combined with an HVAC system for greenhouse climate control in Ahvaz. Using validated computational fluid dynamics (CFD) models, the system’s cooling, ventilation, and heating performance was analyzed over a nine-month period, considering temperature variations, solar radiation, and thermal equipment in a double-pitched roof greenhouse with dimensions of 12×20 m² and a ridge height of 6 m. Results indicated that during hot months, the system reduced indoor temperatures by 13–17°C. However, its cooling efficiency (0.56 vs. 0.62), air exchange rate (3.82 ACH vs. 9.01 ACH), and temperature uniformity index (0.73 vs. 0.82) were lower than those of the conventional fan-pad system. Nonetheless, eliminating fan shaft power resulted in significant energy savings. In cold months, the system increased indoor temperatures by 6.24°C and improved the temperature uniformity index from 0.74 to 0.89, although its heating efficiency (0.43) was lower than expected. These findings suggest that the system, particularly in heating periods, offers a sustainable alternative to conventional systems by enhancing climate control while reducing energy consumption. Design optimizations, such as incorporating thermal curtains and temporary ceiling structures during colder months, could further improve its performance. | ||
| کلیدواژه‌ها [English] | ||
| Computational Fluid Dynamics (CFD), Energy-Efficient Greenhouse Systems, Greenhouse Climate Control, Solar Chimney for HVAC, Sustainable Greenhouse Operations | ||
| مراجع | ||
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