Design of a Thermoelectric Generator-Assisted Energy Harvesting Block Considering Melting Temperature of Phase Change Materials

2021 ◽  
Author(s):  
Jinyoung Ko ◽  
Seong-Yong Cheon ◽  
Yong-Kwon Kang ◽  
Jae-Weon Jeong
Keyword(s):  
Energy Harvesting ◽  
Phase Change ◽  
Melting Temperature ◽  
Thermoelectric Generator ◽  
Phase Change Materials

Phase change materials confined into sunlight capturer sponge towards thermal energy harvesting and storage

Solar Energy ◽  
2021 ◽  
Vol 226 ◽  
pp. 147-153
Author(s):  
Dongli Fan ◽  
Yaqing Lu ◽  
Yufeng Cao ◽  
Jie Liu ◽  
Shaohui Lin ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Phase Change ◽  
Thermal Energy ◽  
Phase Change Materials ◽  
Thermal Energy Harvesting ◽  
And Storage

scholarly journals Breakdown of the Stokes-Einstein relation above the melting temperature in a liquid phase-change material

2018 ◽  
Vol 4 (11) ◽  
pp. eaat8632 ◽  
Author(s):  
Shuai Wei ◽  
Zach Evenson ◽  
Moritz Stolpe ◽  
Pierre Lucas ◽  
C. Austen Angell
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Melting Temperature ◽  
Phase Change Materials ◽  
Dynamic Properties ◽  
Switching Behavior ◽  
Einstein Relation ◽  
Elastic Neutron ◽  
Phase Switching ◽  
Memory Applications

The dynamic properties of liquid phase-change materials (PCMs), such as viscosity η and the atomic self-diffusion coefficientD, play an essential role in the ultrafast phase switching behavior of novel nonvolatile phase-change memory applications. To connect η toD, the Stokes-Einstein relation (SER) is commonly assumed to be valid at high temperatures near or above the melting temperatureTmand is often used for assessing liquid fragility (or crystal growth velocity) of technologically important PCMs. However, using quasi-elastic neutron scattering, we provide experimental evidence for a breakdown of the SER even at temperatures aboveTmin the high–atomic mobility state of a PCM, Ge1Sb2Te4. This implies that although viscosity may have strongly increased during cooling, diffusivity can remain high owing to early decoupling, being a favorable feature for the fast phase switching behavior of the high-fluidity PCM. We discuss the origin of the observation and propose the possible connection to a metal-semiconductor and fragile-strong transition hidden belowTm.

scholarly journals Thermomagnetic energy harvesting with first order phase change materials

2013 ◽  
Vol 114 (3) ◽  
pp. 033915 ◽  
Author(s):  
Alexander Post ◽  
Chris Knight ◽  
Erich Kisi
Keyword(s):  
Energy Harvesting ◽  
Phase Change ◽  
Phase Change Materials ◽  
First Order ◽  
First Order Phase

Bioinspired roll-to-roll solar-thermal energy harvesting within form-stable flexible composite phase change materials

2020 ◽  
Vol 8 (40) ◽  
pp. 20970-20978 ◽  
Author(s):  
Chao Chang ◽  
Xiao Nie ◽  
Xiaoxiang Li ◽  
Peng Tao ◽  
Benwei Fu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Phase Change ◽  
Thermal Energy ◽  
Phase Change Materials ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Storage Media ◽  
Roll To Roll ◽  
Composite Phase Change Materials ◽  
Thermal Energy Harvesting

Roll-to-roll charging of flexible composite phase change materials enables fast solar-thermal energy harvesting within bulk storage media.

scholarly journals Temperature Control in (Translucent) Phase Change Materials Applied in Facades: A Numerical Study

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3286 ◽  
Author(s):  
Tenpierik ◽  
Wattez ◽  
Turrin ◽  
Cosmatu ◽  
Tsafou
Keyword(s):  
Temperature Gradient ◽  
Phase Change ◽  
Specific Heat ◽  
Melting Temperature ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Melting Process ◽  
Large Temperature ◽  
Energy Efficient Buildings ◽  
High Solar Radiation

Phase change materials (PCMs) are materials that can store large amounts of heat during their phase transition from solid to liquid without a significant increase in temperature. While going from liquid to solid this heat is again released. As such, these materials can play an important role in future energy-efficient buildings. If applied in facades as part of a thermal buffer strategy, e.g., capturing and temporarily storing solar energy in so-called Trombe walls, the PCMs are exposed to high solar radiation intensities, which may easily lead to issues of overheating. This paper therefore investigates the melting process of PCM and arrives at potential solutions for countering this overheating phenomenon. This study uses the simulation program Comsol to investigate the heat transfer through, melting of and fluid flow inside a block of PCM (3 × 20 cm2) with a melting temperature of around 25 °C. The density, specific heat and dynamic viscosity of the PCM are modeled as a temperature dependent variable. The latent heat of the PCM is modeled as part of the specific heat. One side of the block of PCM is exposed to a heat flux of 300 W/m2. The simulations show that once part of the PCM has melted convection arises transporting heat from the bottom of the block to its top. As a result, the top heats up faster than the bottom speeding up the melting process there. Furthermore, in high columns of PCM a large temperature gradient may arise due to this phenomenon. Segmenting a large volume of PCM into smaller volumes in height limits this convection thereby reducing the temperature gradient along the height of the block. Moreover, using PCMs with different melting temperature along the height of a block of PCM allows for controlling the speed with which a certain part of the PCM block starts melting. Segmenting the block of PCM using PCMs with different melting temperature along its height was found to give the most promising results for minimizing this overheating effect. Selecting the optimal phase change temperatures however is critical in that case.

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