توسعه و ارزیابی تجربی یک خنک‌کننده تبخیری با سطوح مرطوب

نوع مقاله : مقاله علمی

نویسندگان
حمید مرتضی پور 1
اعظم نوروزی 2
1 دانشیار، مهندسی، دانشگاه بزرگمهر قائنات، قائن، ایران
2 استادیار، فنی و مهندسی، دانشگاه تربت‌حیدریه، تربت‌حیدریه، ایران
10.22034/stme.2026.562938.1189
چکیده
سهم زیادی از انرژی مصرفی در ساختمان‌ برای تهویه مطبوع آن صرف می‌شود. خنک‌کننده‌های تبخیری، به دلیل سازگاری با محیط‌زیست و مصرف انرژی کم‌تر، در مقایسه با انواع تراکمی، از مقبولیت بالاتری برخوردار هستند. عامل اصلی مصرف انرژی در خنک‌کننده‌های تبخیری، عبور اجباری جریان هوا از میان مواد مرطوب شونده است که افت فشار شدید هوا را به دنبال دارد. در تحقیق حاضر، یک خنک‌کننده تبخیری ابتکاری با سطح‌های مرطوب که در آن هوا به‌جای عبور از میان مواد مرطوب، موازی با سطح آن‌ حرکت می‌کند، پیشنهاد گردید. به‌منظور ارزیابی روش پیشنهادی، نمونه آزمایشگاهی آن ساخته شد. مدل‌های ریاضی پیش‌بینی اثر دمای محیط و سرعت هوای عبوری بر شاخص‌های عملکردی خنک‌کننده، با داده‌های تجربی حاصل از آزمایش‌های میدانی، با روش رگرسیون چندگانه غیرخطی به دست آمد. در ادامه، برای اعتبارسنجی مدل‌های به‌دست‌آمده، تعدادی آزمایش، در شرایط متفاوت انجام و داده‌های تجربی حاصل از آزمایش‌ها با داده‌های محاسباتی مدل، با کمک شاخص‌های آماری ضریب تعیین و ریشه میانگین مربعات خطا مقایسه گردیدند. نتایج نشان داد که دمای محیط و سرعت هوا، هر دو، با رابطه‌های درجه 2 بر شاخص‌های عملکردی اثر می‌گذارند. بالاترین مقدار توان خنک‌کنندگی در آزمایش‌های تحقیق، 7/1 کیلووات بود که در که در دمای محیطی 5/23 درجه سلسیوس و سرعت هوای بیش از 3 متر بر ثانیه مشاهده گردید. در این شرایط، کارایی خنک‌کننده 34/0 بود. نتایج ارزیابی معادلات ریاضی به‌دست‌آمده (ضریب تعیین بالاتر از 98/0 و ریشه میانگین مربعات خطا کم‌تر از 00532/0) حاکی از آن بود که معادلات به‌خوبی داده‌های اندازه‌گیری شده را پیش‌بینی کرده‌اند.
کلیدواژه‌ها
توان خنک‌کنندگی
رگرسیون غیر خطی
سرعت هوا
نرخ تبخیر
موضوعات

عنوان مقاله English

Development and Experimental Evaluation of an Evaporative Cooling System with Wetting Surfaces

نویسندگان English

Hamid Mortezapour 1
Azam Noroozi 2
1 Associate Professor, Department of Mechanical Engineering, Bozorgmehr University of Qaenat, Qaen,Iran
2 Department of Civil Engineering and Architecture, University of Torbat Heydarieh, Torbat Heydarieh, Iran
چکیده English

A large share of the energy consumed in buildings is devoted to air conditioning. Evaporative cooling systems, due to their environmental compatibility and lower energy consumption compared to the vapor-compression ones, are more widely accepted. The main source of energy consumption in evaporative coolers is the forced passage of air through wetted materials, which causes a significant pressure drop. In this study, to address this challenge and reduce the energy consumption of evaporative coolers, an innovative design with wetted surfaces was proposed, in which air flows parallel to the wetted surface instead of passing through it. To evaluate the proposed method, a laboratory prototype was constructed. Mathematical models predicting the effects of ambient temperature and airflow velocity on the performance indices of the cooler were developed using nonlinear multiple regression, based on experimental data obtained from field tests. Field experiments were conducted within an ambient temperature range of 15–32 °C and airflow velocities between 1–3 m/s. For validation of the obtained models, additional experiments under different conditions were performed, and the experimental results were compared with model predictions using statistical indices of coefficient of determination (R²) and root mean square error (RMSE). The results showed that both ambient temperature and airflow velocity affect performance indices through quadratic relationships. Cooling capacity improved with increasing ambient temperature up to about 25 °C, after which it declined. The maximum cooling capacity and effectiveness values were 1.7 kW and 0.5, respectively, observed at an ambient temperature of 23.5 °C and airflow velocity of about 3 m/s. Evaluation of the developed mathematical equations (R² > 0.98 and RMSE < 0.00532) revealed that the models accurately predicted the measured data.

کلیدواژه‌ها English

cooling capacity
Nonlinear regression
air velocity
evaporation rate
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  • تاریخ دریافت 08 آذر 1404
  • تاریخ بازنگری 14 دی 1404
  • تاریخ پذیرش 02 اردیبهشت 1405
  • تاریخ اولین انتشار 02 اردیبهشت 1405
  • تاریخ انتشار 01 مرداد 1405