تخمین همزمان خواص ترموفیزیکی و ضرایب انتقال‌حرارت جابجایی یک اتاق نمونه در تهران در یک مساله محاسبه بار حرارتی-برودتی معکوس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد دماوند، دماوند، ایران

2 دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد اهواز، اهواز، ایران

3 دانشکده مهندسی مکانیک، دانشگاه صنعتی شریف، تهران، ایران

4 استادیار مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

چکیده

در این مقاله، خواص ترموفیزیکی و ضرایب انتقال‌حرارت جابجایی یک اتاق نمونه در تهران، در یک مساله محاسبه بار حرارتی-برودتی معکوس بطور جداگانه و همزمان تخمین زده شده‌اند. در این راستا، ابتدا مدل‌سازی حرارتی اتاق جهت محاسبه بار حرارتی-برودتی آن بعنوان مساله مستقیم با فرض اینکه خواص ترموفیزیکی و شرایط مرزی معلوم هستند، انجام گرفته‌است. معادلات حاکم بر این مساله، معادلات هدایت حرارتی گذرا در دیوارها به همراه شرایط مرزی ترکیبی جابجایی و تشعشع با در نظر گرفتن تشعشع بین سطوح داخلی دیوارهای اتاق و همچنین مدل توده‌ای برای بقای انرژی فضای اتاق هستند. برای حل عددی این معادلات از روش حجم محدود و همچنین برای حل عددی معادلات مربوط به مدل توده‌ای فضا و ضرایب حساسیت از روش گسسته‌سازی تفاضل محدود پسرو استفاده شده‌است. سپس از روش تخمین پارامتر گرادیان مزدوج برای تعیین پارامترهای مجهول ضریب انتقال‌حرارت هدایت، ظرفیت حرارت کلی، و ضرایب انتقال‌حرارت جابجایی داخلی و خارجی با استفاده از مقادیر تجربی شبیه‌سازی‌شده با/بدون اغتشاش انجام پذیرفته‌است. نتایج نشان می‌دهند که تخمین جداگانه و همزمان پارامترهای موثر بر بار حرارتی-برودتی و مصرف انرژی ساختمان با استفاده از روش تخمین پارامتر گرادیان مزدوج قابل حصول می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Simultaneous estimation of thermophysical properties and convective boundary conditions of a sample room in Tehran using inverse analysis

نویسندگان [English]

  • Z. Poolaei Moziraji 1
  • A. Azimi 2
  • S. Kazemzadeh Hannani 3
1 Mechanical Engineering Department, Damavand Branch, Islamic Azad University, Tehran, Iran
2 Mechanical Engineering Department, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 Mechanical Engineering Department, Sharif University, Tehran, Iran
چکیده [English]

In this paper, the thermophysical properties and convective heat transfer coefficients of a sample room in Tehran have been estimated separately and simultaneously in an inverse heating-cooling calculation problem. So at first the thermal modeling of the room has been performed as a direct problem. In the direct problem, it is assumed that the thermophysical properties and boundary conditions are known. The governing equations for this problem are transient heat conduction equations in the walls with the combined convection and radiation boundary conditions and the consideration of radiation among the room internal walls’ surface, and also bulk model for energy conservation in the room. To solve numerically these equations, finite volume method has been employed. In addition, to discretize the equation of bulk model and sensitivity coefficients, a backward finite difference method has been used. Then, the parameter estimation technique based on conjugate gradient method has been used for the estimation of the unknown parameters including conductive heat transfer coefficient, volumetric heat capacity, and internal and external convective heat transfer coefficients by with/without noise in measured values. The results show that separate and simultaneous estimations of the parameters that affect the building energy and thermal load of the room are available using the parameter version of conjugate gradient method.

کلیدواژه‌ها [English]

  • Simultaneous Estimation
  • Conjugate Gradient Method
  • Inverse Analysis
  • Boundary Conditions Estimation
  • Building Thermal Load

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 49، شماره 1
اردیبهشت 1396
صفحه 147-160

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