Investigation on the properties of a new type of concrete blocks incorporated with PEG/SiO2 composite phase change material

Xu, Tao; Chen, Qinglin; Zhang, Zhengguo; Gao, Xuenong; Huang, Gongsheng

doi:10.1016/j.buildenv.2016.05.003

Cited by 68 publications

(14 citation statements)

References 34 publications

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“…The thermal conductivity value of 70-wt% PEG/DPMS was 0.491 W/(m·K), which was 1.89 times larger than that of the pure PEG (0.260 W/(m·K)), and moreover, the thermal conductivity value of 70-wt% PEG/DPMS was larger than that of PEG/SiO 2 /MWCNT (0.463 W/(m·K)), 40 PEG/SiO 2 (0.359 W/(m·K)), 41 PEG/ASB (0.251 W/(m·K), and PEG/ASB CPCMs (0.303 W/(m·K)). The thermal conductivity value of 70-wt% PEG/DPMS was 0.491 W/(m·K), which was 1.89 times larger than that of the pure PEG (0.260 W/(m·K)), and moreover, the thermal conductivity value of 70-wt% PEG/DPMS was larger than that of PEG/SiO 2 /MWCNT (0.463 W/(m·K)), 40 PEG/SiO 2 (0.359 W/(m·K)), 41 PEG/ASB (0.251 W/(m·K), and PEG/ASB CPCMs (0.303 W/(m·K)).…”

Section: Thermal Conductivity Of Peg/dpms Compositesmentioning

confidence: 85%

“…Thermal conductivity value is one of the essential parameters of PCMs, and high thermal conductivity could shorten the heat absorption and release time and then enhance the heat storage efficiency of PCMs. The thermal conductivity value of 70-wt% PEG/DPMS was 0.491 W/(m·K), which was 1.89 times larger than that of the pure PEG (0.260 W/(m·K)), and moreover, the thermal conductivity value of 70-wt% PEG/DPMS was larger than that of PEG/SiO 2 /MWCNT (0.463 W/(m·K)), 40 PEG/SiO 2 (0.359 W/(m·K)), 41 PEG/ASB (0.251 W/(m·K), and PEG/ASB CPCMs (0.303 W/(m·K)). 42 Therefore, the supporter of DPMS could increase the thermal conductivity value of PEG significantly, and PEG/DPMS possessed great potential in practical applications.…”

Section: Thermal Conductivity Of Peg/dpms Compositesmentioning

confidence: 85%

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Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

et al. 2019

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Summary Dopamine‐functionalized mesoporous silica (DPMS), which was prepared by using a facile, easy to operate, and environmentally friendly biomimetic method, was synthesized as a new supporter of polyethylene glycol (PEG) to prepare shape‐stabilized phase‐change material (ss‐PCM) of PEG/DPMS with improved enthalpy. The thermal properties of PEG/DPMS were investigated, and the study results demonstrated that dopamine functionalization could regulate the crystallization property of PEG molecules immobilized in PEG/DPMS, and then the enthalpy of PEG/DPMS could be improved effectively. Compared with the ss‐PCM of PEG/SBA‐15 that was synthesized by using unfunctionalized silica molecular sieve (SBA‐15) as the matrix, after dopamine modification, the fusion and solidification enthalpies of 70‐wt% PEG/DPMS increased from 47.25 and 34.96 J/g to 69.77 and 67.54 J/g, respectively. The interaction mechanism study results suggested that the amino groups in the molecule of poly‐dopamines on the surface of DPMS could interact with the oxygen atoms in the molecules of PEG to form hydrogen bonds. Additionally, the PEG/DPMS had favorable thermal reliability and prominent thermal stability. Hence, the DPMS could be applied as a promising supporter for the fabrication of ss‐PCM.

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Section: Thermal Conductivity Of Peg/dpms Compositesmentioning

confidence: 85%

Section: Thermal Conductivity Of Peg/dpms Compositesmentioning

confidence: 85%

Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

et al. 2019

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“…The maximum melting enthalpy was achieved by PEG4000 at approximately 202.1 J/g. Next, Xu et al . investigated the feasibility of PEG/SiO 2 composites in concrete blocks to reduce the energy requirements of building with a melting temperature of 28 °C and a latent heat of 113.6 kJ kg −1 .…”

Section: Introductionmentioning

confidence: 99%

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Fauziyah

Hilmi

Zainuri

et al. 2019

J of Applied Polymer Sci

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Polyethylene glycol (PEG)/quartz (denoted as BP/Q) composites have been investigated as candidates of phase change materials (PCMs) due to their thermomechanical properties around the glass transition temperature as well as thermal properties between 30 and 600 C. Quartz (q-SiO 2 ) powders were extracted from local sand in Tanah Laut, Pelaihari, South Kalimantan, Indonesia. The composites were prepared by dispersing q-SiO 2 powders in the PEG matrix followed by the wet mixing process. The thermal properties of the composites were characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), while the thermomechanical properties were examined using a dynamic mechanical analyzer (DMA) in a three-point bending mode around the PEG glass transition temperature range (−100-50 C). The morphology and interface bonding were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From the DSC measurement, the endothermic peak of the composites showed a shift of approximately 7-12 C toward higher temperatures than that of the pure polymer. The melting enthalpy values (ΔH m ) of the BP/Q composites covered the required PCM application range, that is, between 139 and 182 J/g. The TGA of the composites showed that thermal degradation occurs in the range of 250-450 C. We found that solid-solid PCMs (ssPCMs) were successfully fabricated with the addition of 10 and 20 wt% q-SiO 2 . From DMA characterization, the BP/Q 20 wt% composite exhibited the maximum E' and the minimum energy dissipation (E"). Its E' value was approximately 250 MPa more than that of the pure PEG. The glass transition (T g ) temperatures of PEG and BP/Q composites (5, 10, and 20 wt%) were around −24.5, −19.1, −17.1, and − 5.3 C, respectively. In addition, the E" and tan δ values decreased with q-SiO 2 filler content. Furthermore, the Cole-Cole plots of the BP/Q composites revealed a better interfacial bonding between the q-SiO 2 and the PEG matrix in the composites with higher silica content. A compact morphology was shown by the BP/Q 20 wt% composite due to high silica concentration.

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“…Oruc 15 investigated a (PCM)‐embedded radiant wall heating system with different kinds of PCMs and found out that a commercially available PCM with a melting point at 26°C leads to a significant increase in both energy and exergy efficiency. Concrete blocks designed by Xu et al 16 contained 7.5% of a form‐stable PEG/SiO 2 composite PCM and Voelker 17 equipped a lightweight building test room with PCM. Overall, they compared paraffin and a salt hydrate mixture based on CaCl*6H 2 O and achieved a reduction of the indoor peak temperature of 4 K with a combination of both.…”

Section: Introductionmentioning

confidence: 99%

Passive room conditioning using phase change materials—Demonstration of a long‐term real size experiment

et al. 2020

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Summary The thermal properties of lightweight buildings can be efficiently improved by using phase change materials (PCMs). The heat storage capacity of the building can be extended exactly at the desired temperature level, which leads to an enormous increase in residential comfort. This is shown in the present paper using the example of a prefabricated wooden house. The house was divided into two identical rooms. One of them was equipped with almost one ton of phase change material based on salt hydrates with a melting temperature of approx. 21°C. The material was encapsulated in 1‐l Polyethylene containers and installed in two back‐ventilated layers inside of the walls. The house was monitored for a period of 87 days in terms of temperatures, solar radiation and air velocity inside the PCM wall system. A considerable temperature buffering could be observed in the PCM room compared to the reference room. An overall reduction of the temperature fluctuations of 57% and a reduction of the day/night fluctuations of 62% compared to the reference room could be obtained. In addition, a prediction regarding the energy demand of such buildings is discussed on the basis of a simulation program. Thus, the annual cooling capacity can be reduced by 36.5% compared to the regular timber construction technique by introducing PCM. Furthermore, the good correlation of the simulation results with the experimental ones allows using the simulation as a tool to design a house with additional thermal storages.

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Investigation on the properties of a new type of concrete blocks incorporated with PEG/SiO2 composite phase change material

Cited by 68 publications

References 34 publications

Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

Facile functionalized mesoporous silica using biomimetic method as new matrix for preparation of shape‐stabilized phase‐change material with improved enthalpy

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Passive room conditioning using phase change materials—Demonstration of a long‐term real size experiment

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