ارزیابی عملکرد سامانه سرمایش سقفی تابشی از منظر آسایش حرارتی با در نظر گرفتن حضور انسان و غیر یکنواختی دمای سطح سقف

نوع مقاله : مقاله پژوهشی

نویسندگان

امین حقیقی پشتیری

محمد علیپور دهسری

دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت.

10.22067/jacsm.2025.92064.1315

چکیده

در این مطالعه، شرایط آسایش حرارتی در اتاقی مجهز به سامانه سرمایش سقفی و با در نظر گرفتن حضور انسان برای بررسی تاثیر تغییرات دمای سقف به‌صورت عددی تحلیل شد. مدل‌های k-ε، مختصات گسسته و ری‌تریسینگ برای شبیه‌سازی جریان هوا، تابش خورشید و تشعشع استفاده شدند و آسایش حرارتی با مدل فنگر ارزیابی شد. اعمال اختلاف دمای سقف 1، 3 و 5 درجه سانتیگراد موجب نقض آسایش حرارتی شد. در شرایط دیگر، با اعمال اختلاف دمای سقف با میانگین برابر با حالت سقف دما ثابت، شرایط آسایش حرارتی بهبود یافت و مقدار پی ام وی به ترتیب 0.52، 0.55 و 0.59 شد. بررسی تأثیر اختلاف دمای سقف بر توزیع آسایش حرارتی در 9 ناحیه مختلف اتاق نیز نشان داد با اعمال اختلاف دمای 1 درجه سانتیگراد در سقف، تنها ناحیه مرکزی از شرایط آسایش حرارتی خارج می‌شود. در شرایط اعمال اختلاف دمای3 درجه سانتیگراد، تعداد نواحی خارج از آسایش حرارتی به دو ناحیه افزایش‌یافته و در اختلاف دمای 5 درجه سانتیگراد، این تعداد به سه ناحیه می‌رسد.

کلیدواژه‌ها

سرمایش سقفی

بررسی عددی

آسایش حرارتی

حضور انسان

تغییرات دمای سطح سقف

موضوعات

• انتقال حرارت

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عنوان مقاله English

Evaluation of the performance of radiant ceiling cooling system from the perspective of thermal comfort, considering human presence and non-uniformity of the ceiling surface temperature

نویسندگان English

Amin Haghighi Poshtiri

Mohammad Alipour Dehsari

Associate Professor, Faculty of Mechanical Engineering, University of Guilan, Rasht.

چکیده English

In this study, the thermal comfort in a room equipped with a ceiling cooling system and considering the presence of humans were numerically analyzed to investigate the effect of ceiling temperature changes. k-ε models, discrete coordinates, and raytracing were used to simulate air flow, solar radiation, and radiation, and thermal comfort was evaluated with the Fanger model. Application of ceiling temperature difference of 1C, 3C and 5C caused violation of thermal comfort. By applying the ceiling temperature difference with an average equal to the constant temperature ceiling condition, thermal comfort improved and PMV value was 0.52, 0.55 and 0.59, respectively. Investigating the effect of ceiling temperature difference on thermal comfort in 9 different areas of the room also showed that at temperature difference of 1C for the ceiling, only the central area is out of thermal comfort conditions. At temperature difference of 3C, the number of areas outside of thermal comfort increased to two areas, and at the temperature difference of 5C, this number reached three areas.

کلیدواژه‌ها English

Roof cooling

numerical analysis

thermal comfort

human presence

roof surface temperature changes

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