scholarly journals Molecular solar thermal systems – control of light harvesting and energy storage by protonation/deprotonation

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6356-6364 ◽  
Author(s):  
Martin Drøhse Kilde ◽  
Paloma Garcia Arroyo ◽  
Anders S. Gertsen ◽  
Kurt V. Mikkelsen ◽  
Mogens Brøndsted Nielsen
Keyword(s):  
Optical Properties ◽  
Energy Storage ◽  
Heat Release ◽  
Reaction Rate ◽  
Light Harvesting ◽  
Solar Thermal ◽  
Back Reaction ◽  
Thermal Systems ◽  
Systems Control

The optical properties of pyridyl-substituted dihydroazulene (DHA) photoswitches can be tuned by protonation/deprotonation as well as the thermal back-reaction rate and amount of heat release from the vinylheptafulvene (VHF) photoisomers.

Integration of Heat Pumps With Solar Thermal Systems for Energy Storage

2021 ◽  
Author(s):  
Joshua D. McTigue ◽  
Pau Farres-Antunez ◽  
Christos N. Markides ◽  
Alexander J. White
Keyword(s):  
Energy Storage ◽  
Heat Pumps ◽  
Solar Thermal ◽  
Thermal Systems

Azobenzene-based solar thermal energy storage enhanced by gold nanoparticles for rapid, optically-triggered heat release at room temperature

2020 ◽  
Vol 8 (36) ◽  
pp. 18668-18676 ◽  
Author(s):  
Liqi Dong ◽  
Yuanhao Chen ◽  
Fei Zhai ◽  
Lin Tang ◽  
Wenchao Gao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Energy Storage ◽  
Heat Release ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Room Temperature ◽  
Solar Thermal ◽  
Solar Thermal Energy

The energy storage and heat release of this STF sample can be controlled completely using light alone at room temperature.

Potential Heat Transfer Fluids (Nanofluids) for Direct Volumetric Absorption-Based Solar Thermal Systems

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Vikrant Khullar ◽  
Vishal Bhalla ◽  
Himanshu Tyagi
Keyword(s):  
Heat Transfer ◽  
Optical Properties ◽  
Amorphous Carbon ◽  
Solar Thermal ◽  
Solar Irradiation ◽  
Working Fluid ◽  
Distilled Water ◽  
Thermal Systems ◽  
Nanoparticle Dispersions ◽  
Carbon Based

Nanoparticle dispersions or more popularly “nanofluids” have been extensively researched for their candidature as working fluid in direct-volumetric-absorption solar thermal systems. Flexibility in carving out desired thermophysical and optical properties has lend the nanofluids to be engineered for solar thermal and photovoltaic applications. The key feature which delineates nanofluid-based direct absorption volumetric systems from their surface absorption counterparts is that here the working fluid actively (directly) interacts with the solar irradiation and hence enhances the overall heat transfer of the system. In this work, a host of nanoparticle materials have been evaluated for their solar-weighted absorptivity and heat transfer enhancements relative to the basefluid. It has been found that solar-weighted absorptivity is the key feature that makes nanoparticle dispersions suitable for solar thermal applications (maximum enhancement being for the case of amorphous carbon nanoparticles). Subsequently, thermal conductivity measurements reveal that enhancements on the order of 1–5% could only be achieved through addition of nanoparticles into the basefluid. Furthermore, dynamic light scattering (DLS) and optical measurements (carried out for as prepared, 5 h old and 24 h old samples) reveal that nanoclustering and hence soft agglomeration does happen but it does not have significant impact on optical properties of the nanoparticles. Finally, as a proof-of-concept experiment, a parabolic trough collector employing the amorphous carbon-based nanofluid and distilled water has been tested under the sun. These experiments have been carried out at no flow condition so that appreciable temperatures could be reached in less time. It was found that for the same exposure time, increase in the temperature of amorphous carbon based nanofluid is approximately three times higher as compared to that in the case of distilled water.

Promoting the thermal back reaction of Vinylheptafulvene to Dihydroazulene by physisorbtion on metallic nanoparticles

2021 ◽  
Author(s):  
Andreas Erbs Hillers-Bendtsen ◽  
Magnus Bukhave Johansen ◽  
Kurt V Mikkelsen
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Metallic Nanoparticles ◽  
Storage Systems ◽  
Solar Thermal ◽  
Back Reaction ◽  
Solar Thermal Energy ◽  
Energy Storage Systems ◽  
Thermal Energy Storage Systems

We investigate the effects of nanoparticles on molecular solar thermal energy storage systems and how one can tune chemical reactivities of a molecular photo- and thermoswitch by changing the nanoparticles....

Pyrazolium Phase Change Materials for Solar-Thermal and Wind Energy Storage

2019 ◽  
Author(s):  
Karolina Matuszek ◽  
R. Vijayaraghavan ◽  
Craig Forsyth ◽  
Surianarayanan Mahadevan ◽  
Mega Kar ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
High Efficiency ◽  
Scale Up ◽  
Solar Thermal ◽  
Energy Storage Materials ◽  
Solar Thermal Energy ◽  
Storage Materials

Renewable energy has the ultimate capacity to resolve the environmental and scarcity challenges of the world’s energy supplies. However, both the utility of these sources and the economics of their implementation are strongly limited by their intermittent nature; inexpensive means of energy storage therefore needs to be part of the design. Distributed thermal energy storage is surprisingly underdeveloped in this context, in part due to the lack of advanced storage materials. Here, we describe a novel family of thermal energy storage materials based on pyrazolium cation, that operate in the 100-220°C temperature range, offering safe, inexpensive capacity, opening new pathways for high efficiency collection and storage of both solar-thermal energy, as well as excess wind power. We probe the molecular origins of the high thermal energy storage capacity of these ionic materials and demonstrate extended cycling that provides a basis for further scale up and development.

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