scholarly journals Temperature Control to Improve Performance of Hempcrete-Phase Change Material Wall Assemblies in a Cold Climate

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5343
Author(s):  
Miroslava Kavgic ◽  
Yaser Abdellatef
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Temperature Control ◽  
Energy Demand ◽  
Control Strategies ◽  
Cold Climate ◽  
Embodied Energy ◽  
Energy Storage Materials ◽  
Hysteresis Phenomenon ◽  
Change Material

Phase change material (PCM)-enhanced building envelopes can control indoor temperatures and save energy. However, PCM needs to undergo a phase change transition from solid to liquid and back to be fully effective. Furthermore, most previous research integrated PCM with high embodied energy materials. This study aims to advance the existing research on integrating PCM into carbon-negative wall assemblies composed of hempcrete and applying temperature control strategies to improve wall systems’ performance while considering the hysteresis phenomenon. Four hempcrete and hempcrete-PCM (HPCM) wall design configurations were simulated and compared under different control strategies designed to reduce energy demand while enhancing the phase change transition of the microencapsulated PCM. The HPCM wall types outperformed the hempcrete wall assembly through heating (~3–7%) and cooling (~7.8–20.7%) energy savings. HPCM walls also maintained higher wall surface temperatures during the coldest days, lower during the warmest days, and within a tighter range than hempcrete assembly, thus improving the thermal comfort. However, the results also show that the optimal performance of thermal energy storage materials requires temperature controls that facilitate their charge and discharge. Hence, applied control strategies reduced heating and cooling energy demand in the range of ~4.4–21.5% and ~14.5–55%, respectively.

Analysis of Phase Change Energy Storage Material Selected Based on Rural Kang Body

2014 ◽  
Vol 521 ◽  
pp. 699-702
Author(s):  
Hui Xing Li ◽  
Hong Yu Ding ◽  
Guo Hui Feng ◽  
Xiao Xu Cai
Keyword(s):  
Energy Storage ◽  
Surface Temperature ◽  
Phase Change ◽  
Energy Saving ◽  
Phase Change Material ◽  
Heat Storage ◽  
Material Selection ◽  
Energy Storage Materials ◽  
Storage Materials ◽  
Change Material

Improving rural living thermal environment and rural residential energy-saving effect has becomes a hot society issue. As to two main problems of rural kang which are poor regenerative performance and surface temperature uneven,combined with the characteristics of phase change energy storage technologies,phase change energy storage technology was used in kang body. Grasping the properties and characteristics of different types of energy storage materials,according to the requirement of the human body comfort temperature of the kang surface,selecting phase transition temperature of the phase change energy storage materials which should be put forward kang surface comfort temperature between 24 ~ 35°Cphase change heat storage is particularly important. Through the phase change material selection, get three types of phase change thermal storage materials which are suitable for rural kang, which provides analysis method and basic reference for the selection of the phase change material to kang body, enhanced the heat storage capacity of kang,protected kang surface temperature uniformity and improved the energy-saving efficiency of housing in rural areas.

scholarly journals Enhancement of heat transfer in phase change material using graphite-paraffin composites

2018 ◽  
Vol 172 ◽  
pp. 02001
Author(s):  
R Sathiyaraj. ◽  
R Rakesh. ◽  
N Mithran. ◽  
M Venkatesan.
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Thermal Environment ◽  
Graphite Powder ◽  
Energy Storage Materials ◽  
Melting Period ◽  
Change Material

Phase change materials (PCMs) are energy storage materials which can be used for maintaining a controlled thermal environment for various applications in earth and space. PCMs are used in advanced technologies in aerospace cooling applications like heat exchangers and heat pipes for re-entry vehicles and spacecraft. Paraffin is a phase change material (PCM) commonly used for energy storage-related applications. Paraffin wax exhibits slow thermal response due to low thermal conductivity value (~0.2 W/m K for most paraffin waxes). In the present work, an attempt is made to fabricate a composite PCM using graphite powder. Such a composite material has enhanced thermal conductivity along with reduced melting period which are desirable properties of a PCM during solid to liquid phase change process. The reduction in melting period is indicated by the difference in change in temperature measured by the thermocouples during a specified time. The temperature variation and solid-liquid interface formation during the melting process are experimentally studied. The results showed that composite graphite powder with paraffin can improve the total phase transition time.

A Review of Latent Heat Thermal Energy Storage Systems

2015 ◽  
Vol 787 ◽  
pp. 37-42 ◽  
Author(s):  
G. Murali ◽  
K. Mayilsamy ◽  
B.Mubarak Ali
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Energy Demand ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Thermal Energy Storage Systems ◽  
Change Material

Thermal Energy Storage (TES) has become extremely important in the recent years since it balances the energy demand and improves the efficiency of the solar systems. It is important that the thermal energy storage systems have the necessary characteristics to improve the performance of the storage. Usage of Phase Change Materials (PCM) for energy storage provides a great benefit but, their low thermal conductivity becomes a major drawback. This can be compensated with the use of phase change material in an appropriate design for successful functioning of the system. This review article summarizes the recent designs of thermal energy storage systems containing Phase Change Material that have been adopted for efficient energy storage.

scholarly journals Experimental Investigations Conducted for the Characteristic Study of OM29 Phase Change Material and Its Incorporation in Photovoltaic Panel

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 897 ◽  
Author(s):  
Rajvikram Elavarasan ◽  
Karthikeyan Velmurugan ◽  
Umashankar Subramaniam ◽  
A Kumar ◽  
Dhafer Almakhles
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Energy Demand ◽  
Back Surface ◽  
Experimental Investigations ◽  
Rear Side ◽  
Pv Module ◽  
Change Material

The solar photovoltaic (PV) system is emerging energetically in meeting the present energy demands. A rise in PV module temperature reduces the electrical efficiency, which fails to meet the expected energy demand. The main objective of this research was to study the nature of OM29, which is an organic phase change material (PCM) used for PV module cooling during the summer season. A heat transfer network was developed to minimize the experimental difficulties and represent the working model as an electrical resistance circuit. Most existing PV module temperature (TPV) reduction technology fails to achieve the effective heat transfer from the PV module to PCM because there is an intermediate layer between the PV module and PCM. In this proposed method, liquid PCM is filled directly on the back surface of the PV module to overcome the conduction barrier and PCM attains the thermal energy directly from the PV module. Further, the rear side of the PCM is enclosed by tin combined with aluminium to avoid any leakages during phase change. Experimental results show that the PV module temperature decreased by a maximum of 1.2 °C using OM29 until 08:30. However, after 09:00, the OM29 PCM was unable to lower the TPV because OM29 is not capable of maintaining the latent heat property for a longer time and total amount of the PCM experimented in this study was not sufficient to store the PV module generated thermal energy for an entire day. The inability of the presented PCM to lower the temperature of the PV panel was attributed to the lower melting point of OM29. PCM back sheet was incapable of dissipating the stored PCM’s thermal energy to the ambient, and this makes the experimented PCM unsuitable for the selected location during summer.

Study on Binary Fatty Acids/ Sepiolite Composite Phase Change Material

2011 ◽  
Vol 374-377 ◽  
pp. 807-810 ◽  
Author(s):  
Jian Hong Deng ◽  
Wen Biao Li ◽  
Da Hua Jiang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Energy Storage Materials ◽  
Binary Phase ◽  
Good Energy ◽  
Save Energy ◽  
Composite Energy ◽  
Change Material

Lauric acid/stearic acid as the binary phase change materials, modified sepiolite as the inorganic carrier, organic/inorganic composite energy storage materials was prepared by melting adsorption.Comprehensive experiment results show that binary phase change material is lower than single one at initial phase change temperature and phase change peak temperature, and it has good energy storage results, the composite material can be used in energy storage and heat recovery system to save energy.

scholarly journals Preparation of SA–PA–LA/EG/CF CPCM and Its Application in Battery Thermal Management

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1902
Author(s):  
Ziqiang Liu ◽  
Juhua Huang ◽  
Ming Cao ◽  
Yafang Zhang ◽  
Jin Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Management ◽  
Double Layer ◽  
Temperature Control ◽  
Single Layer ◽  
Mass Ratio ◽  
Change Material

To improve the heat dissipation efficiency of batteries, the eutectic mass ratios of each component in the ternary low-melting phase change material (PCM), consisting of stearic acid (SA), palmitic acid (PA), and lauric acid (LA), was explored in this study. Subsequently, based on the principle of high thermal conductivity and low leakage, SA–PA–LA/expanded graphite (EG)/carbon fiber (CF) composite phase change material (CPCM) was prepared. A novel double-layer CPCM, with different melting points, was designed for the battery-temperature control test. Lastly, the thermal management performance of non-CPCM, single-layer CPCM, and double-layer CPCM was compared via multi-condition charge and discharge experiments. When the mass ratio of SA to PA is close to 8:2, better eutectic state is achieved, whereas the eutectic mass ratio of the components of SA–PA–LA in ternary PCM is 29.6:7.4:63. SA–PA–LA/EG/CF CPCM formed by physical adsorption has better mechanical properties, thermal stability, and faster heat storage and heat release rate than PCM. When the CF content in SA–PA–LA/EG/CF CPCM is 5%, and the mass ratio of SA–PA–LA to EG is 91:9, the resulting SA–PA–LA/EG/CF CPCM has lower leakage rate and better thermal conductivity. The temperature control effect of single-layer paraffin wax (PW)/EG/CF CPCM is evident when compared to the no-CPCM condition. However, the double-layer CPCM (PW/EG/CF and SA–PA–LA/EG/CF CPCM) can further reduce the temperature rise of the battery, effectively control the temperature and temperature difference, and primarily maintain the battery in a lower temperature range during usage. After adding an aluminum honeycomb to the double-layer CPCM, the double-layer CPCM exhibited better thermal conductivity and mechanical properties. Moreover, the structure showed better battery temperature control performance, while meeting the temperature control requirements during the charging and discharging cycles of the battery.

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