ارزیابی مصرف برق و آب مجازی چیلرهای هواخنک با پیش‌سرمایش آدیاباتیک در سه اقلیم شاخص ایران

نوع مقاله : مقاله علمی

نویسندگان
1 استادیار، پردیس مهندسی، دانشگاه بیرجند، بیرجند، ایران
2 کارشناسی ارشد، پردیس مهندسی، دانشگاه بیرجند، بیرجند، ایران
چکیده
با توجه به افزایش روزافزون استفاده از چیلرهای تراکمی هواخنک و راندمان سرمایی پایین‌تر آن‌ها نسبت به نمونه‌های آب‌‌خنک هم‌ظرفیت، این مطالعه به بررسی تأثیر کاهش دمای هوای ورودی به کندانسور از طریق سامانه پیش‌سرمایش آدیاباتیک به‌طور همزمان بر بازده سرمایی، مصرف برق و مصرف آب مجازی چیلرهای هواخنک می‌پردازد. برای تحلیل و ارزیابی یک مدل ریاضی مبتنی بر روابط ترمودینامیکی و انتقال حرارت تدوین شد که در آن پارامترهای کلیدی مورد شبیه‌سازی قرار گرفت. شبیه‌سازی‌ها بر روی چیلر تراکمی هواخنک مدل 30XA-1352 Carrier با ظرفیت سرمایی ۱۴۰۳ کیلووات (معادل ۴۰۰ تن تبرید) انجام شد. نتایج شبیه‌سازی در اقلیم سه شهر مشهد، تبریز و یزد برای دوره یک‌ساله جمع‌آوری و شاخص‌های ضریب عملکرد (COP)، مصرف برق و مصرف آب مجازی ارزیابی شد. در شهر مشهد میانگین کاهش مصرف برق سالانه معادل 29% و افزایش COP  برابر %41 همراه با صرفه‌جویی 1665 مترمکعب آب مجازی به‌دست آمد. در تبریز کاهش مصرف برق 26%، افزایش COP %36 و صرفه‌جویی 1130 مترمکعب آب مجازی مشاهده شد. برای یزد به ترتیب %32 کاهش مصرف برق، %47 افزایشCOP و 3200 مترمکعب صرفه‌جویی آب مجازی محاسبه شد. همچنین نتایج نشان می‌دهد در اقلیم یزد اثر پیش سرمایش هوای ورودی بیشتر از سایر شهر‌ها است. این نتایج حاکی است که به‌کارگیری سامانه پیش‌سرمایش آدیاباتیک در چیلرهای تراکمی هواخنک، به‌طور قابل‌توجهی کارآیی سرمایی را ارتقا داده و مصرف انرژی الکتریکی و آب مجازی را در اقلیم‌های مختلف کاهش می‌دهد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Evaluation of Power Consumption and Virtual Water Use of Air-Cooled Chillers with Adiabatic Pre-Cooling in Three Representative Iranian Climates

نویسندگان English

Ali Saeedi 1
Jamal Rokhsat 2
1 Assistant professor, Department of Mechanical Engineering, University of Birjand, Birjand, Iran
2 M.Sc, Department of Mechanical Engineering, University of Birjand, Birjand, Iran
چکیده English

Air‑cooled vapor‑compression chillers are increasingly deployed because they are compact and easy to install, yet their efficiency lags behind water‑cooled machines of comparable size. This study evaluates whether adiabatic pre‑cooling of condenser‑inlet air can offset that handicap while simultaneously curbing electricity use and the virtual water embodied in power generation. A first‑principles thermodynamic model was formulated for a 1,403 kW (400 RT) Carrier 30XA‑1352 chiller and validated against catalogue data. Hourly weather files for Mashhad, Tabriz, and Yazd drove year‑long simulations. Pre‑cooling lowered condenser air temperature, thereby boosting the annual coefficient of performance (COP) by 41 %, 36 %, and 47 % in Mashhad, Tabriz, and Yazd, respectively. Corresponding electricity savings reached 29 %, 26 %, and 32 %. Although the evaporative system consumed 5.9–11.1 × 10³ m³ of water per year, the reduction in power demand trimmed virtual water withdrawals at power plants by 1.1–3.2 × 10³ m³. Benefits were most pronounced in Yazd’s hot–dry climate, highlighting the climate sensitivity of adiabatic pre‑cooling effectiveness and offering a scalable, cost‑effective retrofit option.

کلیدواژه‌ها English

Vapor-Compression Chiller؛ Adiabatic Pre-Cooling؛ Electricity Consumption؛ Virtual Water

اصل مقاله

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