ارزیابی عملکرد خشک کردن و بازده انرژی خشک‌کن خورشیدی مجهز به مواد تغییر فاز دهنده و سامانه جریان بازگشتی

نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

• محدثه احمدی ¹
• هادی صمیمی اخیجهانی ¹
• پیمان سلامی ²

¹ گروه مهندسی بیوسیستم دانشکده کشاورزی، دانشگاه کردستان، سنندج، ایران

² گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه کردستان، سنندج، ایران

10.22067/ifstrj.2023.79695.1218

چکیده

جمع­کننده خورشیدی تخت یکی از اجزای مهم سامانه­های جاذب انرژی خورشیدی مانند خشک­کن­های خورشیدی است. در این تحقیق در درون جمع‌کننده خورشیدی صفحه تخت از مواد تغییر فاز دهنده به‌صورت لوله­ای استفاده شد. این لوله­ها در پنج ردیف پنج تایی به فواصل 5، 10 و 15 سانتی­متر روی ردیف­ها قرار گرفتند. برای ارزیابی عملکرد حرارتی سه سرعت هوا (m.s^-1 5/0، 1 و 2) و برای ارزیابی عملکرد خشک کردن محصول سنجد در نظر گرفته شد. رطوبت این نمونه­ها برای آسیاب نمودن بایستی به کمتر از 10 درصد می­رسید. برای مدلسازی سینتیک خشک شدن، پنج مدل ریاضی به داده­های خشک شدن برازش شد و مدل هندرسون و پاپیس با ضریب همبستگی بیشتر از 97/0 و ریشه میانگین مربعات خطا کمتر از 05/0 به‌عنوان بهترین مدل انتخاب شد. تأثیر سرعت هوا نسبت به جایگاه قرارگیری مواد تغییر فاز دهنده بر خشک شدن بیشتر بود. با بررسی بازده حرارتی جمع‌کننده خورشیدی این نتیجه حاصل شد که بهترین بازده حرارتی در سرعت هوای m.s^-1 2 با PCM به فواصلcm 15 به میزان 29/56 درصد اتفاق می­افتد. در این حین بیشترین بازده خشک کردن نیز 72/36% به‌دست آمد. استفاده از مواد تغییر فاز دهنده به همراه سامانه جریان بازگشتی اثر منفی بر کیفیت محصول خشک شده نداشت.

کلیدواژه‌ها

• بازده حرارتی
• سامانه جریان بازگشتی
• سنجد
• مواد تغییر فاز دهنده

موضوعات

• مهندسی مواد غذایی

©2023 The author(s). This is an open access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source.

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