Thermal Stability of Attic Spaces with Integrated PCMs during the Climatic Year

2013 ◽  
Vol 649 ◽  
pp. 175-178
Author(s):  
David Bečkovský ◽  
Milan Ostrý ◽  
Tereza Kalábová ◽  
Vladimír Tichomirov
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Transition Period ◽  
Temperature Stability ◽  
Building Structures ◽  
Heating Period ◽  
Indoor Climate ◽  
Summer Time ◽  
The Impact ◽  
Thermal Stability Of

This paper deals with the impact of using phase change materials (PCM) in light building constructions. It describes how these materials react during the whole year, how they impact the summer temperature stability of a room and how they react in the transition period and in the heating period. Measuring was carried out in the experimental and reference room in the attic of the Institute of Building Structures. The layout of these identical rooms enables to compare the measured values. The measuring of the indoor climate, which had been carried out during the whole year in the reference and experimental room, was analyzed. The analysis was used to create the basic methodological procedure for using PCM in light building constructions. These materials proved to be efficient in the summer time. During the heating period the power consumption was monitored in relation to the application of the phase change materials.

Thermal Stability of Building Structures with Phase-Change Materials

2010 ◽  
Author(s):  
Stanislav Št’astník ◽  
Theodore E. Simos ◽  
George Psihoyios ◽  
Ch. Tsitouras
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Materials ◽  
Building Structures ◽  
Thermal Stability Of

scholarly journals Thermo-physical characteristics of building integrated phase change materials (PCM) and their applicability to energy efficient homes

2021 ◽  
Author(s):  
Omar Siddiqui
Keyword(s):  
Compressive Strength ◽  
Phase Change ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Physical Characteristics ◽  
Comfort Level ◽  
Thermal Mass ◽  
Lower Phase ◽  
Physical Test ◽  
The Impact

The applicability of utilizing a variety of thermal mass including phase change materials with commonly used building materials is investigated through the use of simulations and physical testing. The thermal performance and occupant comfort potential of a novel solid-solid phase change material, known as Dal HSM, is compared and contrasted to commonly available forms of thermal mass. Detailed experimentation is conducted to successfully integrate Dal HSM with gypsum and concrete. The measurement of physical characteristics such as compressive strength and modulus of rupture is conducted to ensure that the PCM-composite compound retains the structural integrity to be utilized in a typical building. The use of thermal mass in the Toronto Net Zero house was found to contribute to energy savings of 10-15% when different types of thermal mass were used. The comfort level of the indoor occupants was also found to increase. The performance of Dal HSM was found to be comparable to a commercially available PCM known as Micronal in the heating mode. The cooling mode revealed that Dal HSM provided slightly lower energy savings when compared to Micronal due to a lower phase transition temperature and latent heat. The performance of physical test revealed a decrease in the compressive strength as the concentration of Dal HSM was increased in the PCM-gypsum specimens. Tests were also performed to analyze the impact of increasing the PCM concentration on the flexural strength of PCM-gypsum composite.

scholarly journals Computational Study of Heat Transfer inside Different PCMs Enhanced by Al2O3 Nanoparticles in a Copper Heat Sink at High Heat Loads

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 284 ◽  
Author(s):  
Nadezhda S. Bondareva ◽  
Nikita S. Gibanov ◽  
Mikhail A. Sheremet
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Computational Study ◽  
Conjugate Problem ◽  
High Heat ◽  
Solid Particles ◽  
Heat Sinks ◽  
Al2o3 Nanoparticles ◽  
Electronic Elements ◽  
The Impact

The cooling of electronic elements is one of the most important problems in the development of architecture in electronic technology. One promising developing cooling method is heat sinks based on the phase change materials (PCMs) enhanced by nano-sized solid particles. In this paper, the influence of the PCM’s physical properties and the concentration of nanoparticles on heat and mass transfer inside a closed radiator with fins, in the presence of a source of constant volumetric heat generation, is analyzed. The conjugate problem of nano-enhanced phase change materials (NePCMs) melting is considered, taking into account natural convection in the melt under the impact of the external convective cooling. A two-dimensional problem is formulated in the non-primitive variables, such as stream function and vorticity. A single-phase nano-liquid model is employed to describe the transport within NePCMs.

Extending Die-Attachment Fatigue Life of Power Electronics Using Phase Change Materials

2016 ◽  
Author(s):  
Levi J. Elston
Keyword(s):  
Phase Change ◽  
Power Electronics ◽  
Phase Change Materials ◽  
Operating Conditions ◽  
Device Structure ◽  
Die Attachment ◽  
Advanced Packaging ◽  
Life Improvement ◽  
Solid Liquid ◽  
The Impact

The ever-increasing power throughput and ever-decreasing size of modern electronics, specifically power electronics, requires more advanced packaging techniques and materials to maintain thermal limits and sustain mechanical life. Specific applications with known operating conditions for these components can realize added benefits through a tailored thermal-mechanical-electrical optimized assembly, potentially utilizing niche material classes. Without losing any expected functionality, solid-liquid phase change materials could be incorporated into the device structure to reduce peak temperature and/or suppress high-cycle fatigue problems commonly found at die-attachment interfaces. The purpose of this study was to investigate, through model-based design and analysis, the impact of using organic phase-change materials (PCMs) at two strategic locations in the standard device stack. The results suggest noteworthy life improvement (40%) is possible when optimizing for a given melt point material. Additionally, further improvements were predicted through future material enhancements, namely thermal conductivity and latent heat.

Thermal stability of renewable diesters as phase change materials

2016 ◽  
Vol 644 ◽  
pp. 61-68 ◽  
Author(s):  
Latchmi Raghunanan ◽  
Michael C. Floros ◽  
Suresh S. Narine
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Stability Of

Preparation and Thermal Performance of Poly(Methyl Methacrylate)/Binary Alkane-Alcohol Organic Eutectic Microcapsules as Phase Change Materials for Cold Storage

2016 ◽  
Vol 852 ◽  
pp. 614-617
Author(s):  
Ni Gao ◽  
Li Xian Sun ◽  
Fen Xu ◽  
Huan Zhi Zhang ◽  
Zhong Cao
Keyword(s):  
Methyl Methacrylate ◽  
Phase Change ◽  
Phase Change Materials ◽  
Spherical Shape ◽  
Polymerization Reaction ◽  
Poly Methyl Methacrylate ◽  
Organic Eutectic ◽  
Heat Value ◽  
Ft Ir ◽  
Thermal Stability Of

In this study, the microcapsules containing binary alkane-alcohol organic eutectic of mixed n-tetradecane and 1-dodecanol (TD-DD) phase change materials as the core and poly (methyl methacrylate)(PMMA) as the shell were prepared by emulsion polymerization reaction. The microcapsules were characterized by using DSC, SEM, FT-IR and TG. The results of DSC test showed that melting and freezing temperatures of the microcapsules are-6.136 °C and 5.203 °C, and total latent heat value are-82.522 J/g and 77.632 J/g, respectively. The SEM and FT-IR analyses indicated that PMMA shell has successfully encapsulated TD-DD. The TD-DD and the microcapsules exhibited in spherical shape. Additionally, the TG test showed that the thermal stability of TD-DD was increased after encapsulation.

The Experimental Research on the Thermal Properties of Shape-Stabilized Phase Change Materials

2013 ◽  
Vol 291-294 ◽  
pp. 1159-1163
Author(s):  
Quan Ying Yan ◽  
Li Hang Yue ◽  
Li Li Jin ◽  
Ran Huo ◽  
Lin Zhang
Keyword(s):  
Thermal Stability ◽  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Materials ◽  
Liquid Paraffin ◽  
Capric Acid ◽  
Good Thermal Stability ◽  
Change Material ◽  
Thermal Stability Of ◽  
Better Than

This paper investigated the thermal performance of shape stabilized phase change paraffin and shape-stabilized phase change fatty acid. And the PCMs are mixtures of 60% 46# paraffin and 40% liquid paraffin, 65 % 48# paraffin and 35% liquid paraffin,30%capric acid and 70% lauric acid, 30%capric acid and 70% myristic acid. Support material is high-density polyethylene. The results in this paper show that: Thermal stability of both of the two types of phase change materials are good, thermal stability of shape stabilized phase change fatty acid is better than that of paraffin. Results in this paper can provide references and basis for the application of phase change material walls in the practice building.

scholarly journals Effects of Neglecting PCM Hysteresis While Making Simulation Calculations of a Building Located in Polish Climatic Conditions

2021 ◽  
Vol 11 (19) ◽  
pp. 9166
Author(s):  
Anna Zastawna-Rumin ◽  
Katarzyna Nowak
Keyword(s):  
Surface Temperature ◽  
Phase Change ◽  
Phase Change Materials ◽  
Model Building ◽  
Experimental Tests ◽  
Climatic Conditions ◽  
Heat Accumulation ◽  
Noticeable Effect ◽  
Change Temperature ◽  
The Impact

The use of phase change materials (PCM) in different building applications is a hot topic in today’s research and development activities. Numerous experimental tests confirmed that the hysteresis of the phase change process has a noticeable effect on heat accumulation in PCM. The authors are trying to answer the question of whether the neglecting of hysteresis or the impact of the speed of phase transformation processes reduce the accuracy of the simulation. The analysis was performed for a model building, created to validate the energy calculations. It was also important to conduct simulations for the polish climatic conditions. The calculations were conducted for three variants of materials. In addition, in the case of models containing layers with PCM, calculations were made both taking into account, as well as excluding material hysteresis in the calculations. In the analyzed examples, after taking into account hysteresis in the calculations, the period of time when surface temperature is below the phase change temperature of the materials decreased by 10.6% and 29.4% between 01 June to 30 September, for the options with PCM boards and Dupont boards, respectively. Significant differences in surface temperature were also observed. The effects of neglecting, even relatively small hysteresis, in the calculations are noticeable and can lead to significant errors in the calculation.

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