شبیه‌سازی پویای خنک‌کننده جاذب رطوبت دسیکنت با استفاده هم‌زمان از انرژی‌های تجدیدپذیر خورشیدی و زمینی در آب و هواهای گرم و مرطوب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه تبدیل انرژی، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

2 تربیت مدرس

3 تربیت مدرس * مهندسی مکانیک

چکیده

در این مقاله، عملکرد پویای خنک‌کننده جاذب رطوبت دسیکنت و ترکیب شده با انرژی‌های خورشیدی و منبع زمینی ارائه می‌شود. از انرژی خورشیدی به منظور فراهم آوری حرارت مورد نیاز برای احیاء چرخ دسیکنت و از مبدل منبع زمینی به عنوان پیش خنک‌کن هوا استفاده شده است. پتانسیل خنک‌کننده در برقراری آسایش حرارتی در آب و هواهای گرم و مرطوب ارزیابی شده است. نتایج نشان می‌دهند که این خنک‌کننده می‌تواند با دماهای احیاء پایین (پایین‌تر از 75 درجه سلسیوس) آسایش حرارتی را در این مناطق برقرار کند. به عنوان رویکردی جدید، بیشینه دمای احیاء لازم برای چرخ دسیکنت کنترل شده است. تأثیر عملکرد چرخ دسیکنت و بیشینه دمای احیاء آن بر رفتار خنک‌کننده بررسی شده است. بر اساس نتایج، عملکرد قوی چرخ دسیکنت آسایش حرارتی را تا 40 درصد و سهم انرژی خورشیدی را تا 14 درصد نسبت به عملکرد ضعیف آن افزایش می‌دهد. با کاهش بیشینه دمای احیاء تا 50 درجه سلسیوس، آسایش حرارتی برقرار شده به کمتر از 30 درصد کاهش می‌یابد. استفاده از مبدل منبع زمینی آسایش حرارتی را بهبود می‌بخشد و درصد مشخصی از آسایش حرارتی با دماهای احیاء پایین‌تری برقرار می‌شود. تحلیل اقتصادی نشان می‌دهد که در شرایط برقراری کامل آسایش حرارتی توسط خنک‌کننده، زمان بازپرداخت برابر با 2/8 سال می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Dynamic Simulation of Desiccant Cooling System with Simultaneously Using Solar and Ground Renewable Energies in Hot-Humid Regions

نویسندگان [English]

  • Saeed Rayegan 1
  • Ghassem Heidarinejad 2
  • Hadi PasdarShahri 3
1 Energy conversion group, Faculty of mechanical engineering, Tarbiat Modares University, Tehran, Iran
3 Assistant Professor, Faculty of Mechanical Engineering, Tarbiat Modares University
چکیده [English]

This paper presents the dynamic operation of a desiccant cooling system combined with solar and ground source energies. Solar energy is used for providing the required energy for regenerating the desiccant wheel, and the ground source heat exchanger is exploited as an air pre-cooling component. The potential of the system in providing thermal comfort is assessed in hot-humid regions. Results reveal that this system is capable of providing thermal comfort in these regions with low-grade regeneration temperatures (lower than 75 ℃). As a new perspective, the maximum value of the desiccant wheel regeneration temperature is controlled. The effect of the desiccant wheel performance and its maximum regeneration temperature is evaluated on the behavior of the system. With results, high performance desiccant wheel increases the provided thermal comfort up to 40% and the contribution of solar energy up to 14% compared with its low performance. Reducing the maximum regeneration temperature to 50 ℃, decreases the achieved thermal comfort to lower than 30%. Ground source heat exchanger enhances the thermal comfort and a specified level of that can be provided with lower regeneration temperatures. The economical assessment shows that in entirely provided thermal comfort conditions by the system, the payback period is calculated to be 8.2 years.
 

کلیدواژه‌ها [English]

  • Desiccant Cooling System
  • Solar Energy
  • Ground Source Heat Exchanger
  • Dynamic Performance
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