Application of Fatty Acid Based Phase-Change Material to Reduce Energy Consumption From Roofs of Buildings

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Ahmad K. Sleiti ◽  
Edward J. Naimaster
Keyword(s):  
Fatty Acid ◽  
Energy Consumption ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Energy Performance ◽  
Department Of Energy ◽  
Total Energy Consumption ◽  
Scanning Calorimetry ◽  
Change Material

Buildings account for a significant portion of the total energy consumption in the U.S., especially the energy-inefficient commercial building sector. As part of the future path toward realizing net zero energy buildings, innovative energy-efficient technologies must be developed. In this study, the potential of phase-change material (PCM)-enhanced constructions to lower heating, ventilating, and air conditioning (HVAC) energy consumption in a commercial restaurant building was investigated. A commercially available fatty acid based PCM product was selected due to their promising thermal and chemical properties. Differential scanning calorimetry (DSC) was used in isothermal step mode to accurately measure the latent heat energy storage of the PCM. A U.S. Department of Energy (DOE) commercial reference building model with a PCM-enhanced ceiling was simulated using a finite-difference conduction heat transfer algorithm in EnergyPlus to determine the effects of the PCM on the building energy performance. It was found that, although the PCM-enhanced ceiling had a beneficial stabilizing effect on the interior surface temperature of the ceiling, the zone mean air temperatures were not significantly altered. As such, minimal HVAC energy savings were seen. Future work should focus on active PCM systems, which utilize heat exchanging fluids to discharge the PCM to remove the stored thermal energy of the PCM during the night in summer, overcoming the fundamental issue of the passive PCM system returning stored thermal energy back into the building.

Potential of Phase Change Material-Enhanced Constructions in Commercial Buildings

2012 ◽  
Author(s):  
Edward J. Naimaster ◽  
Ahmad K. Sleiti
Keyword(s):  
Energy Consumption ◽  
Phase Change ◽  
Phase Change Material ◽  
Energy Savings ◽  
Chemical Properties ◽  
Energy Performance ◽  
Commercial Building ◽  
Total Energy Consumption ◽  
Scanning Calorimetry ◽  
Change Material

Buildings account for a significant portion of the total energy consumption in the US, especially the energy-inefficient commercial building sector. As part of the future path towards realizing net zero energy buildings, innovative energy-efficient technologies must be developed. In this study, the potential of phase change material (PCM)-enhanced constructions to lower HVAC energy consumption in a commercial building was investigated. A commercially available fatty acid-based PCM product was selected due promising thermal and chemical properties. Differential scanning calorimetry (DSC) was used in isothermal step mode to accurately measure the latent heat energy storage of the PCM. A US DOE commercial reference building model with a PCM-enhanced ceiling was simulated using a finite-difference conduction heat transfer algorithm in EnergyPlus to determine the effects of the PCM on the building energy performance. It was found that, although the PCM-enhanced ceiling had a beneficial stabilizing effect on the interior surface temperature of the ceiling, the zone mean air temperatures were not significantly altered. As such, minimal HVAC energy savings were seen. Future work should focus on the potential of active PCM constructions, which could successfully remove stored thermal energy from the PCM without increasing the space cooling energy consumption.

Form-stable phase change material based on fatty acid/wood flour composite and PVC used for thermal energy storage

2020 ◽  
Vol 209 ◽  
pp. 109663 ◽  
Author(s):  
Xing Jingchen ◽  
Yang Keyan ◽  
Zhou Yucheng ◽  
Yu Yuxiang ◽  
Chang Jianmin ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Wood Flour ◽  
Stable Phase ◽  
Change Material

The Properties of OMMT-PAN-Binary of Fatty Acids Blends as Phase Change Materials

2011 ◽  
Vol 239-242 ◽  
pp. 1101-1104
Author(s):  
Jing Guo ◽  
Heng Xue Xiang ◽  
Cheng Nv Hu
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Heat Insulation ◽  
Cooling Curve ◽  
Polyacrylonitrile Fiber ◽  
Scanning Calorimetry ◽  
Thermal Circulation ◽  
Change Material

Using stearic acid-lauric acid binary of fatty acid as phase change material, waste polyacrylonitrile fiber (PAN) as supporting material, organic montmorillonite (OMMT) as modifier, and N, N-dimethylformamide as solvent, OMMT-PAN-binary fatty acid composite phase change materials(PCM) is prepared by solution blending. Using Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TG) study the structure and properties of PCM, the optimized preparation techniques of PCM obtained by orthogonal tests. SEM results showed that the PCM was homogeneous structure, binary of fatty acid dispersed in the continuous phase PAN; TGA results indicated that the degradation of the phase change material can be divided into three steps; DSC results showed that the crystallization enthalpy of PCM reached 143.27 J/g, the phase change temperature was around 23°C, and the DSC thermal circulation showed good thermal stability of the PCM; cooling curve showed that the PCM had good heat insulation properties, holding time reached 800s, and after repeated thermal circulation, heat insulation properties remained the same.

scholarly journals Numerical Investigation of Cold Thermal Energy Storage Using Phase Change Material in Freezer

2017 ◽  
Vol 2 (9) ◽  
pp. 1
Author(s):  
Omid Ghahramani Zarajabad ◽  
Rouhollah Ahmadi ◽  
Saeed Ghaffari
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Phase Change ◽  
Numerical Investigation ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Period ◽  
Is Implementation ◽  
Change Material

Freezer is one of the electrical components that can be found in any building. Like any electrical appliance domestic freezer consumes a significant amount of energy during its working time. During recent decades a lot of solutions have been found to reduce this energy consumption. One of the most usable and appropriate ones is implementation of phase change material (PCM) in a Cold Thermal Energy Storage (CTES) system which can be installed in a household freezers. In this paper numerical investigation of using CTES system in a domestic freezer in order to diminish energy consumption during pick hours (18-22:30), is studied. Regard to the temperature ranges of the freezer, NaCl-H2O is used as a PCM in the CTES system. In a distinct period of time, a large amount of cold thermal energy in latent heat form is stored at low temperature in the PCM, and it is released in the freezer’s cabin when the compressor is off. Accordingly, numerical modeling and simulation using Computational Fluid Dynamics (CFD) software on charging and discharging cycle of PCM are done to measure cold storage period and amount of saved energy. The results reveal that using CTES could keep the freezer in the standard thermal condition without using a compressor, for 4.5 hours. These results show that if the PCM used in CTES system for a year, it could reduce energy, fossil fuel consumption and CO2 emission up to 45.7 kWh, 13.7 liters and 32.0 kg, respectively.

scholarly journals Phase Change Material dari Campuran Parafin untuk Tekstil Swa-Termoregulasi

Texere ◽  
2020 ◽  
Vol 18 (2) ◽  
pp. 162-176
Author(s):  
Tisna Kusumah ◽  
Tatang Wahyudi ◽  
Mohamad Widodo
Keyword(s):  
Differential Scanning Calorimetry ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Scanning Calorimetry ◽  
Change Material

Phase change material (PCM) organik seperti lilin parafin memiliki kemampuan untuk menyerap sejumlah energi panas atau entalpi (kJ/kg) pada saat lilin parafin mengalami perubahan fasa dari padat ke cair, dan sebaliknya, melepaskan energi panas saat berubah fasa dari cair ke padat. Kemampuan unik lilin parafin ini telah diteliti oleh banyak peneliti seperti mengenai sifat-sifat termal dan pemanfaatannya sebagai thermal energy storage. Penelitian-penelitian tentang PCM organik yang telah banyak dikerjakan, umumnya menggunakan bahan kelas sintesa yang memiliki keunggulan dalam hal kemurnian tetapi memiliki kesulitan untuk diaplikasikan dalam skala industri karena faktor keekonomisan dan ketersediaan bahan yang sulit didapat dalam skala besar. Oleh karena itu, penelitian ini difokuskan untuk mengetahui perubahan sifat termal dari campuran lilin parafin padat dan cair kelas mutu industri sebagai bahan utama PCM yang dapat dimanfaatkan dalam industri tekstil untuk membuat material tekstil yang responsif dan adaptif terhadap perubahan suhu lingkungan. Hasil analisa DSC (differential scanning calorimetry) menunjukkan bahwa pencampuran lilin parafin padat:cair dengan komposisi 9:1, 8:2, 7:3, dan 6:4 memperlihatkan adanya pembentukan entitas senyawa baru dengan sifat termal yang berbeda. Masing-masing kombinasi campuran yang berbeda memiliki titik leleh dan kandungan entalpi yang semakin menurun dari 60,4 ºC (9:1) ke 51,4 (6:4) seiring dengan menurunnya komposisi lilin parafin padat dan bertambahnya komposisi lilin parafin cair.

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