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Volume 7
Innovative Energy & Research
ISSN: 2576-1463
Advanced Energy Materials 2018
August 13-14, 2018
Page 65
conference
series
.com
August 13-14, 2018 | Dublin, Ireland
20
th
International Conference on
Advanced Energy Materials and Research
Marie Duquesne, Innov Ener Res 2018, Volume 7
DOI: 10.4172/2576-1463-C1-001
Organic biosourced phase change materials for seasonal thermal energy storage
O
ur work focused on thermal energy storage in a seasonal basis for heating and domestic hot water supply in buildings.
The objective is to develop and study innovative organic bio sourced phase change materials (PCM) able to compete with
water and surpass the performances of commonly used PCM today (low cost, high energy density, compactness, thermal losses
reduction, environmentally friendly etc.). Sugar alcohols (SA) and their blends could provide high storage energy densities in
the range of 120–190 kWh/m
3
at temperatures inferior to 100°C with limited thermal losses due to high undercooling. They
are compatible with commonly used container materials and with cheap solar collectors. They present long-term stability (no
separation, no segregation, controllable thermal degradation) and moderate-to-low volume changes. Their prices are acceptable.
First, a screening of SA and SA-blends to select the ones with melting temperatures inferior to 100°C was done. Then, an
experimental characterization of the selected SA and SA-blends was performed. This encompasses the measurements of their
melting point, their latent heat of fusion and the experimental determination of all key physical properties (specific heat, thermal
conductivity, thermal diffusivity, density, viscosity) as a function of the temperature. The activation of the energy discharge process
(crystallization) is difficult and the subsequent crystallization rates (discharge powers) are very low. Therefore, it was important to
find out an easy to implement and efficient solution to discharge the storage system at the required power when needed. When the
energy is needed, the storage system is discharged by activating SA crystallization using the efficient method found out in previous
step. The associated discharge power depends on the SA crystal growth kinetics. The final step aims at measuring and modeling
crystal growth rates in undercooled melts of SA and SA blends according to the temperature and determining the involved crystal
growth mechanisms.
Figure 1:
Activation of undercooled SA by bubbling (a-d) and optical and infrared images of one SA initiated crystallization (e & f)
Recent Publications
1.
E Palomo Del Barrio, R Cadoret, J Daranlot and F Achchaq (2016) Infrared thermography method for fast estimation of phase
diagrams. Thermochimica Acta 625:9-19.
2.
E Palomo Del Barrio, R Cadoret, J Daranlot and F Achchaq (2016) New sugar alcohols mixtures for long-term thermal energy
storage applications at temperatures between 70°C and 100°C. Solar Energy Materials and Solar Cells 155:454-468.
3.
E Palomo del Barrio, AGodin, MDuquesne, J Daranlot, J Jolly, WAlshaer, TKouadio and A Sommier (2017) Characterization
of different sugar alcohols as phase change materials for thermal energy storage applications. Solar Energy Materials and Solar
Cells 159:560-569.
Marie Duquesne
Bordeaux INP - CNRS, France