علوم مهارتی و خلاقیت

علوم مهارتی و خلاقیت

طراحی و ساخت دستگاه اندازه‌گیری ضریب انتقال حرارتی جامدات بر اساس روش مقایسه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.
2 مدرّس و محقق پسادکتری، گروه برنامه‌ریزی شهری، دانشکده جغرافیا و برنامه‌ریزی، دانشگاه اصفهان، ایران.
چکیده
ضریب انتقال حرارت جامدات، یکی از پارامترهای متداول فیزیکی مواد است که برای تشخیص میزان هدایت حرارتی یا میزان عایق‌بودن جنس موردنظر در مقابل حرارت اندازه‌گیری می‌شود. هدف اصلی این مطالعه، طراحی، ساخت و بررسی عملکرد دستگاه اندازه‌گیری ضریب انتقال حرارتی جامدات بر اساس روش مقایسه‌ای و ارزیابی آن نسبت به روش مطلق می‌باشد. این دستگاه با قابلیت تنظیم روی دو وضعیت مطلق و مقایسه‌ای، امکان این ارزیابی و مقایسه را فراهم کرده است. در این دستگاه، تغییرات دما به‌صورت نمودار ثبت شده، با تعریف پارامترهای مستقیم، امکان محاسبه ضریب انتقال حرارت نمونه جامد فراهم شده است. در بخش سخت‌افزاری، تجهیزات الکتریکی (دیمر، ترموستات دمایی، ریزپردازنده، حسگر دمایی و رابط‌ها) و مکانیکی (دافع حرارت آلومینیومی، عایق‌های حرارتی، بدنه فولادی و اتصالات) مورد استفاده قرار گرفته است. پس از طراحی بخش نرم‌افزاری برای نظارت و محاسبه ضریب انتقال حرارت رسانشی، دو بخش سخت‌افزاری و نرم‌افزاری با یکدیگر مرتبط و هماهنگ‌سازی شده‌اند تا دستگاه به‌صورت یک بسته کاربردی ارائه شود. با توجه به نتایج به‌دست‌آمده از آزمایش نمونه‌های جامد انجام‌شده با دستگاه ارائه شده و مقایسه و تحلیل آنها نسبت به مقادیر موجود در منابع، این نتیجه به‌دست آمد که عملکرد دستگاه در بازه خطایی کمتر از 5 درصد واقع شده است. همچنین بر اساس پارامتر دمایی  مشخص شد که پایداری روش مقایسه‌ای به‌کارگرفته‌شده تا حدود 71 درصد بالاتر از روش مطلق می‌باشد.
کلیدواژه‌ها

عنوان مقاله English

Design and Fabrication of a Solid Thermal Conductivity Measurement Device based on Comparative Method

نویسندگان English

Mehdi Jafari Vardanjani 1
Maliheh Izadi 2
1 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
2 University of Isfahan, Faculty of Geography, Department of Urban Planning, Isfahan, Iran.
چکیده English

Heat transfer coefficient of solids is one of the common physical parameters which is measured to determine the degree of heat conduction or insulation of the desired material against heat. The main goal of this study was to design and fabricate a device for measuring the heat transfer coefficient of the solids based on the comparative method and its evaluation compared to the absolute method. In this device, temperature changes were recorded in the form of graphs. The conductive heat transfer coefficient of the solid samples was calculated after defining the parameters. In the hardware, electrical equipment (dimmer, temperature thermostat, microprocessor, temperature sensor, and interfaces) and mechanical equipment (aluminum heat sink, thermal insulation, steel body, and connections) were used and assembled. After designing the computer software for monitoring and calculating the conductive heat transfer coefficient, hardware and software sections were linked to make the device a functional set. According to the results obtained by testing solid specimens performed on the device, it was concluded that the performance of the device was within the error range of less than 5%. In addition, based on the temperature parameter , the stability of the comparative method was approximately 71% higher than the absolute method.

کلیدواژه‌ها English

Heat Transfer Coefficient
Solids
Laboratory Device
Physical Parameter
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  • تاریخ دریافت 09 اسفند 1402
  • تاریخ بازنگری 09 اردیبهشت 1403
  • تاریخ پذیرش 22 اردیبهشت 1403