@article { author = {Mohammad, Shaghayegh}, title = {Evaluating the thermal performance of wall construction materials* Case study: Residential buildings of Tehran}, journal = {Journal of Fine Arts: Architecture & Urban Planning}, volume = {18}, number = {1}, pages = {69-78}, year = {2013}, publisher = {University of Tehran College of Fine Arts}, issn = {2228-6020}, eissn = {2676-4318}, doi = {10.22059/jfaup.2013.36358}, abstract = {Abstract This study examines thermal performance of conventional wall construction materials and systems used in typical residential buildings in the city of Tehran; these materials are used instead of traditional heavyweight materials used in vernacular architecture of the region and represented appropriate potential in moderating outdoor weather conditions and providing thermal comfort for occupants. The necessity of this study is due to the important role of the building envelope, as an interface between indoors and outdoors, in control of the heat transfer and moderating weather conditions. With growing concern about climate change and global approach to cut CO2 emissions, application of construction systems which can help reduce energy consumption and associated carbon emissions are desired. As the wall area constitutes the largest part of the building envelope, its contribution to heat loss through the fabric is significant. Moreover, due to growing rate of the number of residential buildings in Tehran, there is a great potential of energy saving in improvement of the residential building’s envelope. The steady state thermal analysis is not an appropriate/ sufficient way of evaluating thermal performance of the building envelope as the indoor condition is the result of the dynamic response of the building fabric energy system to dynamic outdoor weather conditions. Therefore, apart from insulating capacity of the wall, its useful thermal mass which is a function of heat capacity, density and thermal conductivity of the composing layers of the wall, has an important role on its cyclic performance especially when the outdoor temperature starts cycling below and above indoor temperature. Therefore, a dynamic simulation tool (IES-VE) was used to analyse thermal performance of common wall construction alternatives in Tehran. These wall types are mostly made of hollow clay, LECA (Lightweight Expanded Clay Aggregates) and AAC (Autoclaved Aerated Concrete) blocks in combination with insulating materials (Expanded Polystyrene) and were tested on a reference building selected as a sample of typical residential buildings in Tehran. Indoor temperature resulted by each wall type was plotted against comfort temperature of the residents of Tehran in order and the deviation on indoor temperature from comfort temperature was measured to evaluate the level of comfort provided by each of these construction details. According to the results from the simulations, wall type L2 made of two layers of LECA blocks (100 mm) with a layer of polystyrene (50 mm) in between has the best performance in terms of providing indoor comfort condition among total six wall types introduced. Results show that there is a potential of 50% energy saving by application of wall type L2 instead of L1 (made of 200 mm hollow LECA blocks) which have the best and worst performance in terms of deviation of indoor temperature from comfort temperature}, keywords = {Key words: Building Envelope,Thermal Mass,Thermal Comfort,Non-Steady State Calculations,Dynamic Thermal Performance of Materials}, title_fa = {مطالعه رفتار حرارتی مصالح رایج در ساخت دیوار * مطالعه موردی: ساختمان¬های مسکونی شهر تهران}, abstract_fa = {چکیده پوسته ساختمان به عنوان واسطه اصلی بین  فضای بیرون و درون، نقش اساسی در کنترل شرایط محیطی و تامین آسایش ساکنین ساختمان ایفا می‌کند. در سال­های اخیر، با توجه به ضرورت کاهش و جلوگیری از صدور گازهای گلخانه‌ای، اهمیت مسئله طراحی و اجرای سیستم‌های ساخت و ساز که با کم‌ترین استفاده از سیستم‌های فعال توانایی تامین آسایش حرارتی برای ساکنین را دارا باشند، آشکار است. بررسی این امر که مصالح جدید و سیستم‌های ساخت دیوار رایج تا چه حد می‌توانند آسایش حرارتی ساکنین را تامین کنند، پرسشی است که این تحقیق در پی پاسخ آن است. این تحقیق با استفاده از نرم‌افزار شبیه‌سازی انرژی IES-VE ، به شبیه‌سازی نحوه رفتار گونه­های مختلف دیوار که از ترکیب بلوک­های سفالی، لیکا، هبلکس و عایق حرارتی ساخته شده و در ساختمان‌های مسکونی شهر تهران متداولند، می‌پردازد. ضمنِ پرداخت و تحلیل نتایج، مواردی از قبیل نقش متفاوت جرم حرارتی و عایق حرارتی، تعریف ویژگی‌های حرارتی دینامیک و رفتار دوره‌ای مصالح در مواجهه با شرایط ناپایدار محیط بیان می‌گردد. نتایج تحقیق نشان از لزوم استفاده از محاسبات شرایط ناپایدار به جای روش مرسوم محاسبات پایدار می‌دهد. همچنین از میان گونه‌های دیوار معرفی شده، دیوار ساخته­شده از دو ردیف بلوک لیکای ۱۰ سانتیمتری با ۵ سانتیمتر عایق در میانه آنها مناسب‌ترین عملکرد را از نظر توانایی تامین آسایش حرارتی داراست.}, keywords_fa = {Key words: Building Envelope,Thermal Mass,Thermal Comfort,Non-Steady State Calculations,Dynamic Thermal Performance of Materials}, url = {https://jfaup.ut.ac.ir/article_36358.html}, eprint = {https://jfaup.ut.ac.ir/article_36358_043975c1039f1969c43c1fe4836fb096.pdf} }