شهرام دلفانی
استادیار، مرکز تحقیقات راه، مسکن و شهرسازی، تهران
[ 1 ] - بررسی عددی تأثیر پارامترهای مؤثر بر روی کارآیی کلکتور خورشیدی حجمی با استفاده از نانوسیال آب-اکسید مس
کلکتورهای خورشیدی سیستم‌هایی هستند که با انتقال انرژی خورشیدی به سیال باعث افزایش دمای آن می‌شوند. استفاده از سیالات پایه معمولی از قبیل آب و اتیلن گلیکول به علت خواص حرارتی نسبتاً ضعیف، راندمان پایینی در این وسایل ایجاد می‌کند؛ لذا اخیراً دانشمندان به فکر استفاده از نانوسیال‌ها که دارای خواص حرارتی ویژه‌ای هستند، افتاده اند. در این مقاله اثر پارامترهای جدیدی مثل ضخامت شیشه، ضخامت عایق کف کلکتور ...
[ 2 ] - تحلیل تجربی تاثیر نانوصفحات گرافن اکساید/آب دیونیزه بر عملکرد یک گردآورنده جذب مستقیم خورشیدی
از آنجا که انرژی خورشید یکی از شناخته شده ترین منابع مهم انرژی تجدیدپذیر می باشد راهکارهای افزایش جذب انرژی خورشیدی نقش قابل توجهی را در اثربخشی سیستم گردآورنده گرمایی ایفا می کند. هدف از این مطالعه تحلیل تجربی عملکرد گردآورنده جذب مستقیم خورشیدی با استفاده از نانوسیال نانوصفحات گرافن اکساید بر پایه آب دیونیزه می باشد. درصد وزنی گرافن اکساید در سیال پایه آب دیونیزه به ترتیب درصدهای 005/0 ، 015/...
[ 3 ] - Experimental investigation on performance comparison of nanofluid-based direct absorption and flat plate solar collectors
In the present work, a prototype of a new type of solar collectors, which called Direct Absorption Solar Collector, was built and its thermal performance is experimentally compared with conventional flat plate solar collector under transient and steady state conditions. Different volume fractions of multi wall carbon nanotubes in water and ethylene glycol mixture (70%:30% in volume) were used a...
[ 4 ] - Direct Absorption Solar Collector using Carbon Nanotubes Nanofluid: An Experimental Investigation
In this study, the efficiency of direct absorption solar collector (DASC) using carbon nanotube nanofluid in the mixture of water and ethylene glycol as the base fluid was experimentally investigated and compared with the efficiency of the flat plate solar collector (FPSC). The results show that the maximum efficiency of the DASC using the base fluid and absorptive bottom surface is about 4.7% ...
[ 5 ] - Experimental investigation on performance comparison of nanofluid-based direct absorption and flat plate solar collectors
In the present work, a prototype of a new type of solar collectors, which called Direct Absorption Solar Collector, was built and its thermal performance is experimentally compared with conventional flat plate solar collector under transient and steady state conditions. Different volume fractions of multi wall carbon nanotubes in water and ethylene glycol mixture (70%:30% in volume) were used a...
[ 6 ] - The Effect of Geometrical Characteristics of Desiccant Wheel on its Performance
Desiccant wheels are widely used in buildings to control humidity and reduce energy consumption. A model is presented based on transient coupled heat and mass transfer, to model, design and analyze the effects of geometrical characteristics of a honeycombed rotary desiccant wheel and its performance. Governing equations are solved numerically using finite volume method and the model is validate...
[ 7 ] - An Assessment of Indoor Air Quality and Thermal Comfort in Educational Spaces (Case Study: Girls' High Schools in Arak, Iran)
As students spend one-third of their time at school, their health, comfort, and productivity are mostly influenced by thermal condition and indoor air quality of classrooms. Regarding that manual window-opening is a common way for providing fresh air in classes and students aren't allowed to change their uniform, position or control the windows during the lesson hours, providing thermal comf...