scholarly journals Improvement of the Solar-Thermal Characteristics of the Flat-Plate Collector Using a Composite Coating

2021 ◽  
Vol 24 (1) ◽  
pp. 24-29
Author(s):  
Ruaa H. Jasim ◽  
◽  
Ahmed A. Al-Tabbakh ◽  
Sinan M. Hasan ◽  
◽  
...  
Keyword(s):  
Composite Coating ◽  
Thermal Characteristics ◽  
Thermal Conversion ◽  
Primary Component ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Black Paint ◽  
Reflectance Measurement ◽  
Collector Plate ◽  
Flat Plate Collector

A commercially available matt black paint is used as the primary component of a composite coating for low-temperature flat collector systems. The composite coating is composed of the paint, carbon black powder (CBP) and lithium metal oxide (LMO) powder. The CBP and LMO powders are added on the top of the primary paint to improve the solar-thermal conversion characteristics of the collector. The optical and solar-thermal conversion characteristics of these coatings are investigated by means of optical microscopy, optical spectrophotometry, total reflectance measurement, and the measurement of the maximum collector temperature. Results show that the solar-thermal conversion response (maximum temperature) of the collector plate can be improved with the addition of the CBP and LMO powder at low concentrations. This is been demonstrated and discussed in this report. The coatings prepared in the present work can easily be applied on the collector surface and exhibit competing characteristics to other coatings.

scholarly journals Numerical Simulations for Analyzing the Efficiency Parameters of a New Type of Flat-Plate Solar Collectors

2020 ◽  
Vol 20 (4) ◽  
pp. 70-85
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Cold Water ◽  
Thermal Characteristics ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Ansys Fluent ◽  
Collector Plate ◽  
Flat Plate Solar Collector

This article discusses a new design concept for a flat solar collector using flexible tubes. A flat-plate solar collector is designed to run cold water into solar heating systems instead of using expensive antifreeze fluids and to remove secondary media. The development of this type of solar thermal collectors will reduce the installation costs of traditional solar thermal systems without the need for secondary heat exchangers. We determined the main parameters of the heat capacity of a flat solar collector and computed the temperature profile of the absorber plate of a flat-plate solar collector with an inlet temperature of 30 °C. In contrast to a tube coil type temperature loop, it was found that the maximum temperature of the collector plate under the same inlet temperature conditions is much lower than that of the former. Using the CFD (Computational Fluid Dynamics) ANSYS FLUENT 19.0 commercial software package, a phase design was developed based on predictions of the reservoir thermal characteristics and the equivalent heat transfer coefficient of the absorber plates. Experimental test variables for a flat-plate solar collector were also calculated; these were higher with incident solar radiation than with ambient temperature.

Self-encapsulating Ag nanospheres in amorphous carbon: A novel ultrathin selective absorber for flexible solar-thermal conversion

2021 ◽  
Author(s):  
Wei Li ◽  
Cheng-Bing Wang ◽  
Jinzhu Yang ◽  
Jiulong wang ◽  
Wenhe Zhang
Keyword(s):  
Energy Conversion ◽  
Amorphous Carbon ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Solar Absorbers ◽  
Energy Conversion Devices

Solar-thermal conversion is very appealing for various applications, especially in wearable energy conversion devices. Despite various solar absorbers having been developed, they are usually suitable only for rigid substrates. Hence...

Concentrating Solar Power Development in China

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Zhifeng Wang ◽  
Xin Li ◽  
Zhihao Yao ◽  
Meimei Zhang
Keyword(s):  
Solar Power ◽  
Technology Development ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Energy Storage Materials ◽  
Concentrating Solar Power ◽  
Air Power ◽  
Conversion Materials ◽  
Solar Power Tower ◽  
Evacuated Tube

Research on concentrating solar power (CSP) technologies began in 1979 in China. With pressure on environmental and energy resources, the CSP technology development has been accelerating since 2003. After 30 years of development, China has made significant progress on solar absorbing materials, solar thermal-electrical conversion materials, solar energy storage materials, solar concentrator equipments, evacuated tube solar trough collectors, solar thermal receivers, solar dish-Stirling systems, solar high-temperature air power generations, and solar power tower system designs. A 1 MW solar tower plant demonstration project landmark is currently being built in Beijing, to be completed by 2010 with a maximum temperature of 390°C and pressure of 2.35 MPa.

Micro Solar Thermal Collector Glazing for Enhanced Thermal Energy Harvesting

2012 ◽  
Author(s):  
E. Ogbonnaya ◽  
L. Weiss
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Alternative Energy ◽  
Capture Efficiency ◽  
Solar Thermal ◽  
Small Scale ◽  
Collector Plate ◽  
Research Areas ◽  
Area Of Interest ◽  
Solar Thermal Collector

Increasing focus on alternative energy sources has produced significant progress across a wide variety of research areas. One particular area of interest has been solar energy. This has been true on both large and small-scale applications. Research in this paper presents investigations into a small-scale solar thermal collector. This approach is divergent from traditional micro solar photovoltaic devices, relying on transforming incoming solar energy to heat for use by devices like thermoelectrics. The Solar Thermal Collector (STC) is constructed using a copper collector plate with electroplated tin-nickel selective coating atop the collector surface. Further, a unique top piece is added to trap thermal energy and reduce convective, conductive, and radiative losses to the surrounding environment. Results show a capture efficiency of 92% for a collector plate alone when exposed to a 1000 W/m2 simulated solar source. The addition of the top “glazing” piece improves capture efficiency to 97%. Future work will integrate these unique devices with thermoelectric generators for electric power production. This will yield a fully autonomous system, capable of powering small sensors or other devices in remote locations or supplementing existing devices with renewable energy.

scholarly journals Recent Research Progress in Solar Thermal Conversion Theory and Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-2 ◽  
Author(s):  
Gang Pei ◽  
Yuehong Su ◽  
Sauro Filippeschi ◽  
Hongfei Zheng
Keyword(s):  
Thermal Conversion ◽  
Solar Thermal ◽  
Research Progress ◽  
Recent Research Progress
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