Reducing Heat Conduction of Autoclaved Aerated Concrete Wall Using Phase Change Material

2013 ◽  
Vol 807-809 ◽  
pp. 2779-2783
Author(s):  
Atthakorn Thongtha ◽  
Somchai Maneewan ◽  
Chantana Punlek ◽  
Yothin Ungkoon
Keyword(s):  
Heat Conduction ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Source ◽  
Concrete Wall ◽  
Autoclaved Aerated Concrete ◽  
Thermal Delay ◽  
Aerated Concrete ◽  
Change Material ◽  
Minimum Heat

In this work, the effect of the salt hydrated phase change material (PCM) on microstructure and heat conduction of the autoclaved aerated concrete (AAC) was studied. The microstructure in the AAC and AAC with composed phase change material was imaged by scanning electron microscopy (SEM). The ability in heat conduction was compared among AAC (AAC1), AAC with composed phase change material (0.417 (AAC2) and 0.833 (AAC3) kg/m2 in contents), and AAC which was composed by PCM (0.417 (AAC4) and 0.833 (AAC5) kg/m2 in contents) and was coated by the cement in 2 sides. These ones were tested the thermal delay at 40, 50 and 60 °C using the heater that was the thermal source. It was found that the optimum content of PCM on top surface was found at 0.417 kg/m2 because the minimum heat conduction and the lowest average temperatures of inside wall and inside room were shown in this sample at 40, 50 and 60 °C.

scholarly journals Thermal Effectiveness Enhancement of Autoclaved Aerated Concrete Wall with PCM-Contained Conical Holes to Reduce the Cooling Load

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2170 ◽  
Author(s):  
Atthakorn Thongtha ◽  
Aitthi Khongthon ◽  
Thitinun Boonsri ◽  
Chan Hoy-Yen
Keyword(s):  
Room Temperature ◽  
Time Lag ◽  
Testing Temperature ◽  
Thermal Source ◽  
Concrete Wall ◽  
Thermal Dynamics ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
C 50 ◽  
Set Up

This work investigates and improves the thermal dynamics of autoclaved aerated concrete (AAC) wall containing phase change material (PCM). The PCM is paraffin wax loaded into conical holes drilled into the AAC. Filled AAC with three different numbers of PCM-filled holes (2, 3, and 4 conical holes, which are designated as AAC-2H, AAC-3H, and AAC-4H, respectively) as well as the unfilled original AAC were both tested under two different conditions: indoors (with controlled temperature) and outdoors (with actual weather). For the indoor experiment, a heater was used as a thermal source and set up to maintain the testing temperature at one of three levels: 40 °C, 50 °C, or 60 °C. The wall temperature was then measured on the surface with each horizontally-positioned wall as well as four different positions at various depths below the surface of the wall. It was found that AAC-4H was the optimum condition, which can produce outstandingly a time lag of approximately 27%, reduce a decrement factor of approximately 31%, and also decrease the room temperature. This reached approximately 9% when compared with that of ordinary AAC at the controlled testing temperature of 60 °C. All samples were further tested in actual weather to confirm the thermal performances of AAC-4H. Thermal effectiveness of AAC-4H was improved by extending approximately a 14.3% time lag, which reduces approximately a 4.3% decrement factor and achieving approximately 5% lower room temperature when compared with ordinary AAC.

Study on the heat conduction of phase-change material microcapsules

2013 ◽  
Vol 22 (3) ◽  
pp. 257-260 ◽  
Author(s):  
Gangtao Zhao ◽  
Xiaohui Xu ◽  
Lin Qiu ◽  
Xinghua Zheng ◽  
Dawei Tang
Keyword(s):  
Heat Conduction ◽  
Phase Change ◽  
Phase Change Material ◽  
Change Material

scholarly journals Thermal Response Of An Aerated Concrete Wall With Micro-Encapsulated Phase Change Material

2015 ◽  
Vol 23 (2) ◽  
pp. 19-22
Author(s):  
Dušana Halúzová
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Response ◽  
Concrete Wall ◽  
Laboratory Equipment ◽  
R Program ◽  
Concrete Blocks ◽  
Aerated Concrete ◽  
Encapsulated Phase Change Material ◽  
Change Material

Abstract For many years Phase Change Materials (PCM) have attracted attention due to their ability to store large amounts of thermal energy. This property makes them a candidate for the use of passive heat storage. In many applications, they are used to avoid the overheating of the temperature of an indoor environment. This paper describes the behavior of phase change materials that are inbuilt in aerated concrete blocks. Two building samples of an aerated concrete wall were measured in laboratory equipment called “twin-boxes”. The first box consists of a traditional aerated concrete wall; the second one has additional PCM micro-encapsulated in the wall. The heat flux through the wall was measured and compared to simulation results modeled in the ESP-r program. This experimental measurement provides a foundation for a model that can be used to analyze further building constructions.

Numerical Investigation of a Phase Change Material Building Integrating Solar Thermal Collector PCM-BST

2021 ◽  
pp. 1-34
Author(s):  
Benkadour Ayman ◽  
Mustapha Faraji
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Numerical Investigation ◽  
Melting Temperature ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Concrete Wall ◽  
Change Material

Abstract Sensible thermal energy storage systems can reduce energy environmental fluctuation dependency with the nocturnal energy needs usage in maintaining the building's comfort levels. In the present paper, Phase Change Material (PCM) is introduced to improve the thermal energy storage capacity of a solar collector integrating a novel composite Phase Change Material (PCM)/concrete wall. A mathematical model based upon the conservation and heat transfer equations has been developed using the enthalpy method. The Numerical investigation has been implemented into a personal FORTRAN code. Many series of simulation runs were executed. The position of the PCM layer within the wall and the PCM melting temperature are varied in the range 0 cm ≤ xm ≤ 7.5 cm and 15 °C ≤ Tm ≤ 35 °C, respectively. The objective is to let inner temperature Tin swing close to a comfort threshold. The position of PCM close to the absorber improves the efficiency of the room heating with good nocturnal use of latent heat stored during the day. PCM melting temperature affects deeply the composite PCM/concrete wall/solar collector behavior. Lastly, PCM gained the system an important benefit which is the solar collector high-Temperature isolation as to not reach the room and disturb the inside comfort zone by melting and solidifying. Those parameters can be considered as the primary pointers for PCM/wall integrated solar collector design. Also, a Daily Heating Potential, Qh, and Thermal Load Leveling, TLL, are introduced to evaluate the system performance.

scholarly journals Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 179
Author(s):  
Krzysztof Dutkowski ◽  
Marcin Kruzel ◽  
Bartosz Zajączkowski
Keyword(s):  
Phase Change ◽  
Specific Heat ◽  
Phase Change Material ◽  
Water Solution ◽  
Heat Of Fusion ◽  
Main Peak ◽  
Liquid Form ◽  
Microencapsulated Phase Change Material ◽  
Thermal Delay ◽  
Change Material

This paper details an experimental study that was performed to investigate the specific heat of microencapsulated phase change material (mPCM) slurry and its heat of fusion at the PCM phase change transition temperature. Six samples (mPCM slurry concentrate with the water solution of propylene glycol used as a main base liquid) were prepared. As the concentrate contains 43.0% mPCM, the actual mass fraction amounts to 8.6, 12.9, 17.2, 21.5, 25.8, and 30.1 wt%, respectively. The thermal delay method was used. Samples were cooled from 50 °C to 10 °C. A higher concentration of microcapsules caused a proportional increase in the specific heat of slurry at the main peak melting temperature. The maximum value of the specific heat changed from 9.2 to 33.7 kJ/kg for 8.6 wt%, and 30.1 wt%, respectively. The specific heat of the mPCM slurry is a constant quantity and depends on the concentration of the microcapsules. The specific heat of the slurry (PCM inside microcapsules in a liquid form) decreased from 4.0 to 3.8 kJ/(kgK) for 8.6 wt%, and 30.1 wt% of mPCM, respectively. The specific heat of the slurry (PCM inside microcapsules in a liquid form) was higher than when the PCM in the microcapsules is in the form of a solid and increased from 4.5 to 5.2 kJ/(kgK) for 8.6 wt% and 30.1 wt% of mPCM, respectively.

NUMERICAL STUDY OF A SOLAR GREENHOUSE DRYER WITH A PHASE-CHANGE MATERIAL AS AN ENERGY STORAGE MEDIUM

2018 ◽  
Vol 49 (6) ◽  
pp. 509-528 ◽  
Author(s):  
Orawan Aumporn ◽  
Belkacem Zeghmati ◽  
Xavier Chesneau ◽  
Serm Janjai
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Numerical Study ◽  
Storage Medium ◽  
Solar Greenhouse ◽  
Change Material
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