Improving the performance of an active greenhouse dryer by integrating a solar absorber north wall coated with graphene nanoplatelet-embedded black paint

Solar Energy ◽  
2022 ◽  
Vol 231 ◽  
pp. 140-148
Author(s):  
Fatih Selimefendigil ◽  
Ceylin Şirin ◽  
Hakan F. Öztop
Keyword(s):  
Black Paint ◽  
Graphene Nanoplatelet ◽  
Solar Absorber ◽  
North Wall

Experimental Evaluation of a Cylindrical Parabolic Solar Collector

1977 ◽  
Vol 99 (2) ◽  
pp. 163-168 ◽  
Author(s):  
J. W. Ramsey ◽  
B. P. Gupta ◽  
G. R. Knowles
Keyword(s):  
Heat Pipe ◽  
Solar Collector ◽  
Elevated Temperatures ◽  
Heat Losses ◽  
Solar Flux ◽  
Parabolic Trough ◽  
Peak Efficiency ◽  
Black Paint ◽  
Technical Feasibility ◽  
Solar Absorber

Results are presented for a series of solar collector experiments in which the incident solar flux was concentrated by a single-axis tracking parabolic trough mirror. The concentrated solar flux was directed onto an absorber tube whose axis coincided with the focal axis of the concentrator. The performance of the collector was evaluated using three different absorbers; a black painted tube designed to operate near ambient temperature, a heat pipe which had a selective solar absorber coating applied to its surface, and a heat pipe which had its surface coated with a nonselective black paint. The peak efficiency for the collector in the absence of heat losses is approximately 62 percent when the incoming solar energy is normal to the collector aperture. The heat losses which occurred at elevated temperatures (300°C) decreased the peak efficiencies to 50 and 30 percent, respectively, for the selectively coated and black painted tubes. The experimental results establish the technical feasibility of using parabolic trough collectors for applications requiring thermal energy at temperatures up to 300°C.

scholarly journals A Thermoelectric Energy Harvester Based on Microstructured Quasicrystalline Solar Absorber

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 393
Author(s):  
Vinícius Silva Oliveira ◽  
Marcelo Miranda Camboim ◽  
Cleonilson Protasio de Souza ◽  
Bruno Alessandro Silva Guedes de Lima ◽  
Orlando Baiocchi ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Solar Radiation ◽  
Heat Sink ◽  
Energy Harvester ◽  
Black Paint ◽  
Solar Absorber ◽  
Thermoelectric Energy ◽  
Thermoelectric Energy Harvesting ◽  
Smart Agriculture ◽  
Iot Devices

As solar radiation is the most plentiful energy source on earth, thermoelectric energy harvesting emerges as an interesting solution for the Internet of Things (IoTs) in outdoor applications, particularly using semiconductor thermoelectric generators (TEGs) to power IoT devices. However, when a TEG is under solar radiation, the temperature gradient through TEG is minor, meaning that the TEG is useless. A method to keep a significant temperature gradient on a TEG is by using a solar absorber on one side for heating and a heat sink on the other side. In this paper, a compact TEG-based energy harvester that features a solar absorber based on a new class of solid matter, the so-called quasicrystal (QC), is presented. In addition, a water-cooled heat sink to improve the temperature gradient on the TEG is also proposed. The harvester is connected to a power management circuit that can provide an output voltage of 3 V and store up to 1.38 J in a supercapacitor per day. An experimental evaluation was carried out to compare the performance of the proposed QC-based harvester with another similar harvester but with a solar absorber based on conventional black paint. As a result, the QC-based harvester achieved 28.6% more efficient energy generation and achieved full charge of a supercapacitor around two hours earlier. At last, a study on how much the harvested energy can supply power to a sensor node for Smart agriculture during a day while considering a trade-off between the maximum number of measurements and the maximum number of transmission per day is presented.

Dry sliding wear behavior of aluminum graphene nanoplatelet (GNP) composites

2016 ◽  
Vol 58 (7-8) ◽  
pp. 640-643 ◽  
Author(s):  
Ilyas Istif ◽  
Mehmet Tunc Tuncel
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Graphene Nanoplatelet

High Concentration Graphene Nanoplatelet Dispersions in Water Stabilized by Graphene Oxide

Carbon ◽  
2020 ◽  
Author(s):  
Sreemannarayana Mypati ◽  
Andrew Sellathurai ◽  
Marianna Kontopoulou ◽  
Aristides Docoslis ◽  
Dominik P.J. Barz
Keyword(s):  
Graphene Oxide ◽  
High Concentration ◽  
Graphene Nanoplatelet

Double-layer solar absorber coating based on high entropy ceramic AlCrMoTaTiN: Structure, optical properties and failure mechanism

2021 ◽  
Vol 24 ◽  
pp. 101062
Author(s):  
Hui-Xia Guo ◽  
Dong-Mei Yu ◽  
Cheng-Yu He ◽  
Xiao-Li Qiu ◽  
Shuai-Sheng Zhao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Failure Mechanism ◽  
Double Layer ◽  
High Entropy ◽  
Solar Absorber

scholarly journals Broadband Solar Absorber Based on Square Ring cross Arrays of ZnS

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 909
Author(s):  
Feng Xu ◽  
Lixia Lin ◽  
Jun Fang ◽  
Mianli Huang ◽  
Feng Wang ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Visible Light ◽  
Surface Plasmon ◽  
Wide Spectrum ◽  
Clean Energy ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Plasmon Mode ◽  
Solar Absorber ◽  
Absorbing Material

Solar energy is an inexhaustible clean energy. However, how to improve the absorption efficiency in the visible band is a long-term problem for researchers. Therefore, an electromagnetic wave absorber with an ultra-long absorption spectrum has been widely considered by researchers of optoelectronic materials. A kind of absorbing material based on ZnS material is presented in this paper. Our purpose is for the absorber to achieve a good and wide spectrum of visible light absorption performance. In the wide spectrum band (553.0 THz–793.0 THz) of the absorption spectrum, the average absorption rate of the absorber is above 94%. Using surface plasmon resonance (SPR) and gap surface plasmon mode, the metamaterial absorber was studied in visible light. In particular, the absorber is insensitive to both electric and magnetic absorption. The absorber can operate in complex electromagnetic environments and at high temperatures. This is because the absorber is made of refractory metals. Finally, we discuss and analyze the influence of the parameters regulating the absorber on the absorber absorption efficiency. We have tried to explain why the absorber can produce wideband absorption.

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