ارزیابی عملکرد حرارتی یک دودکش خورشیدی با دو حالت مستقل و تزریق هوا از کف - نمونه موردی: ساختمان اداری در شهر کرمان

نوع مقاله : مقاله های برگرفته از رساله و پایان نامه

نویسندگان

1 گروه معماری، واحد بین المللی کیش، دانشگاه آزاد اسلامی، جزیره کیش، ایران

2 استادیار گروه معماری، دانشکده معماری و شهرسازی، واحد قزوین، دانشگاه بین المللی امام خمینی، قزوین، ایران

3 استادیار گروه مکانیک، دانشکده فنی و مهندسی، واحد قزوین، دانشگاه بین المللی امام خمینی، قزوین، ایران

چکیده

سهم عمده‌ای از مصرف انرژی با بهره‌گیری از تجهیزات مکانیکی تأمین می‌گردد. روش طراحی غیرفعال می‌تواند به حفظ شرایط حرارتی آسایش در ساختمان‌ها و کاهش مصرف انرژی کمک کند. به‌طور‌خاص، اجرای دودکش‌های خورشیدی در جهت تهویه هوای داخلی ساختمان باعث کاهش راندمان انرژی می‌شود. در این مقاله یک ارزیابی عملکرد آسایش حرارتی در یک ساختمان دولتی با و بدون ادغام دودکش خورشیدی توسط برنامه شبیه‌سازی دیزاین‌بیلدر مدل‌سازی شده و با استفاده از روش دینامیک سیالات (CFD) به بررسی توزیع دمایی و نحوه جریان هوا پرداخته شد که نتایج نشان داد که ادغام دودکش های خورشیدی می‌تواندPMV (میانگین رأی پیش بینی شده) را به میزان 55 درصد نسبت به ساختمان پایه کاهش دهد و مقادیر آن به بازه استاندارد اشری 55 و ایزو7730 نزدیک گردد. در ادامه تحقیق آزمایش-هایی بر ایجاد حفره تحتانی دودکش انجام گرفته شد که مکش هوای بیرون به داخل دودکش را به‌عهده دارد و نتایج آن به افزایش عملکرد دودکش‌های خورشیدی و نزدیک کردن به معیار آسایش حرارتی فنگر انجامید. بطوریکه معیار آسایش حرارتی PMV از 63/4 واحد به میزان 56/2 واحد و میانگین دمای هوای اتاق‌ها در گرم‌ترین ماه سال (جولای) از 21/36 درجه سانتی‌گراد به 61/33 درجه رسید که میانگین دما، مقدار 6/2 درجه سانتی‌گراد کاهش پیدا کرده است. به‌طورکلی، سیستم ترکیبی دودکش خورشیدی و با تزریق هوا از کف آن، میزان تهویه بالاتری را در محیط داخلی ایجاد می‌کند و پتانسیل بالاتر آن را به‌عنوان یک سیستم تهویه غیرفعال در اقلیم گرم خودنمایی می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of thermal performance of a solar chimney with two independent modes and air injection from the floor - Case study: Office building in Kerman

نویسندگان [English]

  • Poopak Poursistani 1
  • Hossein Medi 2
  • mostafa mafi 3
1 Department of Architecture, Kish International Branch, Islamic Azad University, Kish island, Iran
2 Assistant Professor, Department of Architecture, Faculty of Architecture and Urban Planning, Qazvin Branch. Imam Khomeini International University, Qazvin, Iran.
3 Assistant Professor, Department of Mechanics, Faculty of Engineering, Qazvin Branch, Imam Khomeini International University, Qazvin, Iran Assistant Professor, Department of Mechanics, Faculty of Engineering, Qazvin Branch, Imam Khomeini International
چکیده [English]

The major share of energy consumption in the building sector includes cooling and heating systems. However, today the need for thermal comfort of users is met by using mechanical equipment. Passive design method can help maintain comfortable thermal conditions in buildings and reduce energy consumption by minimizing the use of mechanical or electromechanical air conditioning systems. In particular, the implementation of solar chimneys to ventilate the interior of the building reduces energy efficiency. Solar chimney is a passive and innovative design. In this article, an evaluation of thermal comfort performance in a government building with and without solar chimney integration in Kerman is presented, which is modeled by Design Builder simulation program and using fluid dynamics method. (CFD) The temperature distribution and airflow were studied. The results of this study showed that the integration of solar chimneys can reduce the PMV (predicted average vote) by 55% compared to the base building and its values ​​to The standard range of Ashri 55 and ISO 7730 is approaching. In the continuation of the research, experiments were performed on creating the lower cavity of the solar chimney. So that the PMV thermal comfort criterion from 4.63 units to 2.56 units and the average room temperature in the hottest month of the year (July) from 36.21 degrees Celsius to 33.61 degrees

کلیدواژه‌ها [English]

  • Solar Chimney
  • Thermal Assessment - Hot and Dry Climate
  • Builder Design
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