Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userUse of PCM materials for the reduction of thermal energy requirements in buildings
استخدام المواد متغيرة الطور PCM لتخفيض احتياجات الطاقة في الأبنية السكنية
3092
7 141
0
(
0
)
Created by
Shamra Editor
Ask ChatGPT about the research
يعد تخزين الطاقة الحرارية بالطريقة الكامنة إحدى الطرق الاقتصادية لتحقيق ترشيد استيهلاك الطاقة في المباني و تأمين شروط الراحة. تم في هذا البحث دراسة تأثير استخدام ألواح من المواد متغيرة الطور في هيكل شقة سكنية تقع في مدينة حمص باستخدام برنامج النمذجة و المحاكاة PCM Express. حيث تم اختيار ألواح PCM لها درجة حرارة تحول طوري مساوية لدرجة الحرارة التصميمية الداخلية ركبت على الوجه الداخلي للجدران و السقف.
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 software. 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.
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
ASHRAE STANDARD,2007- Energy Standard for Buildings.IES, Willy, New York,189
rate research
Read More
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).
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.
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.
The Phase Change Materials (PCM) are materials which absorb a great quantity of
energy during the change of phase solid /liquid and relies it during solidification
An application of these materials is thermal energy storage. The PCM integrated into
materials of the building can reinforce their inertia and reduce the power necessary for the
heating and air conditioning. This is particularly true for the buildings of the tertiary sector
whose envelope is light. Nevertheless, one of the characteristics which limits the use of the
PCM is their low conductivity.
The objective of this article is to propose a selection of materials having a
conductivity high enough to make it possible to ensure an air conditioning in summer
while limiting, even while removing, the use of energy (electricity or fuel) thanks to walls
containing these PCMs. This article consists of two parts:
- The first part exposes the problems of the study and specifies the context in which
the use of a PCM as a passive air conditioning system fits.
- The second part fixes the selection criteria which will allow, in a first approach to
choose certain materials.
When the temperature of the external surface of a wall increases, it is important to predict what the thickness of the wall will be so that the internal surface of the wall does not exceed a limit value. We will study, by an analytical method, the ca
se in which the external surface temperature is linearly varying with time in order to determine the time for which the temperature does not exceed a predetermined limit value at a given depth from the surface. Two cases will be considered: the first one is for a wall made of a homogeneous material (e.g. concrete) and the second one is for a wall made up of concrete and phase-changing material whose melting temperature will be selected according to the desired temperature. The results obtained show that a significant delay to reach this temperature can be obtained between the two cases.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
