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Register a new userThermal analysis of PCM wallboards to be used in building envelopes for energy conservation
التحليل الحراري للجدران الحاوية على المواد متغيرة الطور لاستخدامها في ترشيد استهلاك الطاقة في هياكل الأبنية
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تم في هذا البحث إجراء دراسة رياضية تحليلية لألواح المواد متغيرة الطور PCM wallboards بالاعتماد على محاكاة السلوك الحراري لها حيث تم تحديد المعادلات الناظمة لعملية انتقال الحرارة ضمن الألواح عند تغير حالتها الطورية و تم تشكيل الموديل الرياضي اللازم و إنشاء نموذج للوح المادة متغيرة الطور و تم استخدام النموذج لمحاكاة السلوك الحراري لعدة بُنى مختلفة للجدار (لوح مفرد لمادة متغيرة الطور، لوح مادة متغيرة الطور مع طبقة عازل حراراي، لوح مادة متغيرة الطور مع بلوك اسمنتي).
In this paper, an analytical and mathematical study of the PCM wallboards was done by simulate its thermal behavior, depending on governing heat transfer equations which describe the phase change process of the PCM wallboard . A mathematical model was done and used to simulate the thermal behavior of several different structures of the wall (single PCM wallboard, PCM wallboard + thermal insulation layer, PCM wallboard + a concrete block).
References used
Ahmad M., Bontemps A., Sallée H., Quenard D. (2006a) Thermal testing and numerical simulation of a prototype cell using light wallboards coupling vacuum isolation panels and phase change material. Energy and Buildings 38:673-681
Ahmad M., Bontemps A., Sallée H., Quenard D. (2006b) Experimental investigation and computer simulation of thermal behavior of wallboards containing a phase change material. Energy and Buildings 38:357-366
Diaconu B.M., Cruceru M. (2010) Novel concept of composite phase change material wall system for year-round thermal energy savings. Energy and Buildings 42:1759-1772
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Thermal energy can be stored as a latent heat in building structures
by materials with low phase change temperature called phase
change materials (PCM).
In this paper, an analytical and mathematical study of the PCM
wallboards was done by simulat
e its thermal behavior, depending on
governing heat transfer equations which describe the phase change
process of the PCM wallboard.
Latent heat storage is an economical way to achieve energy
efficiency and improve thermal comfort in buildings.
In this research, the effects of using PCM Wallboards in a
residential apartment envelop located in Homs was studied by PCM
Express so
ftware.
PCM wallboard with 23°C melting temperature was used and
installed on the inner face of the walls and ceiling of the apartment.
This investigation shows that the importance of using PCMs in
buildings envelope, compared with conventional thermal insulation
materials, due to the effectiveness of PCMs materials and storing
and releasing of thermal energy, which contributed to reducing of
thermal loads and improved the internal thermal comfort.
Calculation of fire resistance for any structural member divided in two independent steps . The first step involves predicting the temperature distribution inside the structural members, referred to as ‘thermal analysis’. The second step of the analy
sis, termed the ‘structural analysis’, is carried out for the main purpose of determining the response of the structure due to static and thermal loading. The first stages of analysis are discussed in this paper, using finite element method by a structural analysis program " ANSYS "
The research aims to reach fuel conservation opportunities and environment Protection while heating the water, by comparing the most common uses of primary and secondary energy carriers in our country . For example, water heating using electricity ge
nerated by fuel oil and gas, or the direct use of gas and diesel oil for water heating.
The coast of heating the water domestic uses was calculated by various ways, in order to find a low coast method and to avoid environmental damage.
In this research ,the conservation of primary energy for water heating while using gas and diesel oil boilers, was 4 times larger compared to the use of electricity generated by gas and fuel oil .As a result, the coast of water heating using gas burner was 4 times lower, while the coast of water heating using gas boiler was 10 times lower, compared to the coast of electricity heating method. this research also showed, that the use of gas fuel , is the best water heating method, concerning fuel conservation and environment Protection.
The objective of this investigation is to study the influence of application of phase
change material (PCM) in solar basin stills for improving its productivity.
The experimental results of this investigation showed that using phase change
materia
l (paraffin wax) in solar basin still improved its daily productivity, which increased
with increasing the mass of phase change material. The highest increase ratio of daily
productivity was 26.3[%] when using 3.5[kg] of phase change material in plastic case, and
it was 34.74[%] when using 4.5[kg] of phase change material (PCM) in metal case.
Also the experimental results of this investigation showed an increase in the period
of working basin still provided with phase change material compared with basin still
without phase change material. This is owing to the latent heat stored in phase change
material, which is emitted to water when solar radiation decreases. This results in longer
period of work for the basin still.
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