A thermal efficiency-enhancing strategy of parabolic trough collector systems by cascadingly applying multiple solar selective-absorbing coatings

2022 ◽  
Vol 309 ◽  
pp. 118508
Author(s):  
Kai Zhao ◽  
Hongguang Jin ◽  
Zhongrui Gai ◽  
Hui Hong
Keyword(s):  
Thermal Efficiency ◽  
Parabolic Trough ◽  
Parabolic Trough Collector

Construction and thermal efficiency test of 145m and 165m SpaceTube® large-aperture parabolic trough collector prototypes

2016 ◽  
Author(s):  
Salvador Valenzuela Rubia ◽  
Markus Schramm ◽  
Hülya Yildiz ◽  
Patrick Marcotte ◽  
David Martín Casero ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Large Aperture ◽  
Efficiency Test

Enhancing the thermal efficiency of parabolic trough collector using rotary receiver tube

2022 ◽  
Vol 51 ◽  
pp. 101941
Author(s):  
N. Sreenivasalu Reddy ◽  
S. Gowreesh Subramanya ◽  
K.C. Vishwanath ◽  
M. Karthikeyan ◽  
S. Kanchiraya
Keyword(s):  
Thermal Efficiency ◽  
Parabolic Trough ◽  
Parabolic Trough Collector

scholarly journals Optimal forecasting of thermal conductivity and storage in parabolic trough collector using phase change materials

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
P. Muruganantham ◽  
◽  
Balaji Dhanapal ◽  
Keyword(s):  
Solar Energy ◽  
Phase Change ◽  
Heat Loss ◽  
Thermal Efficiency ◽  
Phase Change Materials ◽  
Storage System ◽  
Solar Collectors ◽  
Parabolic Trough ◽  
Fluid Medium ◽  
Parabolic Trough Collector

Renewable energy is one of the cleaner energy generation strategies practiced all over the world to reduce environmental impacts and waste based on current sustainability in economic practices. Solar energy is one kind of renewable sources of energy practiced for different application. The thermal storage system in solar energy is one of the least practiced methods in research, and the utilization of solar energy in the thermal application is attaining higher responses and is quite possible. In this paper, solar heat generation is attained by solar parabolic trough collector using phase change materials. The ideology behind this research is to develop a thermal energy storage system using solar collectors and phase change materials. A composition mixture of MgCl2. 6H2O phase change materials used as the fluid medium in trough collector and thermal efficiency of the material is evaluated. For effective optimization, an imperialist competitive algorithm is used for optimizing the thermal efficiency of the solar collectors. The thermal efficiency of the collector is numerically experimented in the running platform of Mat Lab and executed in terms of heat gain, heat loss, and thermal efficiency of the parabolic trough collector, respectively. The efficiency of the proposed framework is 85%, and the current framework just has 80% efficiency. The heat loss in the proposed framework is lower than that of the current system, distinguished as 4200 W and 4520 W, respectively. It is shown from the research study that the proposed PCM composition is an optimal method for generating heat energy in solar parabolic trough collectors.

Experimental Study on Thermal Efficiency of Parabolic Trough Collector (PTC) Using Al2O3/H2O Nanofluid

2015 ◽  
Vol 787 ◽  
pp. 192-196
Author(s):  
E. Siva Reddy ◽  
R. Meenakshi Reddy ◽  
K. Krishna Reddy
Keyword(s):  
Experimental Study ◽  
Solar Energy ◽  
Thermal Efficiency ◽  
Base Fluid ◽  
Concentration Ratio ◽  
Volume Fraction ◽  
Nano Particles ◽  
Parabolic Trough ◽  
Flow Rates ◽  
Parabolic Trough Collector

Dispersing small amounts of solid nano particles into base-fluid has a significant impact on the thermo-physical properties of the base-fluid. These properties are utilized for effective capture and transportation of solar energy. This paper attempts key idea for harvesting solar energy by using alumina nanofluid in concentrating parabolic trough collectors. An experimental study is carried out to investigate the performance of a parabolic trough collector using Al2O3-H2O based nanofluid. Results clearly indicate that at same ambient, inlet temperatures, flow rate, concentration ratio etc. hike in thermal efficiency is around 5-10 % compared to the conventional Parabolic Trough Collector (PTC). Further, the effect of various parameters such as concentration ratio, receiver length, fluid velocity, volume fraction of nano particles has been studied. The different flow rates employed in the experiment are 2 ml/s, 4 ml/s and 6 ml/s. Volumetric concentration of 0.02%, 0.04% and 0.06% has been studied in the experiment. Surfactants are not introduced to avoid bubble formation. Tracking mode of parabolic trough collector is manual. Results also reveal that Al2O3-H2O based nanofluid has higher efficiency at higher flow rates.

scholarly journals Performance Evaluation of Multiple Helical Tubes as a Receiver for Solar Parabolic Trough Collector

2019 ◽  
Vol 6 (2) ◽  
pp. 115-122
Author(s):  
Swapnil N. Lotake ◽  
M. M. Wagh
Keyword(s):  
Mass Flow ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Focal Point ◽  
Thermal Power ◽  
Heat Transfer Fluid ◽  
Parabolic Trough ◽  
Black Paint ◽  
Parabolic Trough Collector ◽  
Helical Tubes

Solar parabolic trough collector consists of a parabolic reflector with a central receiver at a focal point through which heat transfer fluid is passed. Parabolic trough collector is used mostly in solar thermal power plants for generating electricity. This paper describes the experimental results of two straight tubes wrapped over each other to form a helically shaped receiver. The receiver was tested with aluminium material with and without black paint over it. Also, the helical tube receiver was tested with a glass cover over it, at two different mass flow rates and, with and without manual tracking. The tested instantaneous thermal efficiency ranges from 31.26% to 45.28% and the overall thermal efficiency ranges from 14.9% to 31.41% during the experimental period. The instantaneous thermal efficiency increased by an average of 1.32 times for unpainted receiver and 1.36 times for black painted receiver with the increase in mass flow rate. By tracking the parabolic collector according to sun’s position, there is an average increase in instantaneous thermal efficiency by 1.1 times for unpainted receiver and 1.04 times for black painted receiver. The paper further reveals that the use of multiple helical tubes as a receiver for parabolic trough collector increases the overall efficiency of the collector in a substantial manner.

scholarly journals Thermal Performance Comparison of Parabolic Trough Collector (PTC) Using Various Nanofluids

2021 ◽  
Vol 10 (4) ◽  
pp. 875-889
Author(s):  
Ashutosh Shirole ◽  
Mahesh Wagh ◽  
Vivek Kulkarni
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Large Scale ◽  
Solar Thermal ◽  
Pumping Power ◽  
Parabolic Trough ◽  
Parabolic Trough Collector

The objective of this paper is to investigate the theoretical performance of Parabolic Trough Collector (PTC) using various nanofluids. The theoretical performances are calculated for Al2O3, graphite, magnetite, SWCNH, CuO, SiO2, MWCNT, TiO2, Fe2O3, and ZnO in water nanofluids. The heat transfer equations, thermodynamic properties of nanofluid and pumping power are utilised for the development of novel thermal model.  The theoretical thermal efficiency of the PTC is calculated, and the economic viability of the technology is predicted for a range of nanofluid concentration. The results showed that the thermal conductivity increases with the concentration of nanoparticles in the base fluid. Magnetite nanofluid showed the highest thermal efficiency, followed by CuO, MWCNT, ZnO, SWCNH, TiO2, Fe2O3, Al2O3, graphite, and SiO2, respectively. The study reveals that MWCNT at 0.4% concentration is the best-suited nanofluid considering thermal gain and pumping power. Most of the nanofluids achieved optimum efficiency at 0.4% concentration. The influence of mass flow rate on thermal efficiency is evaluated. When the mass flow rate increased from 70 Kg/hr to 90Kg/hr, a 10%-20% efficiency increase is observed. Dispersing nanofluids reduces the levelized cost of energy of large-scale power plants. These findings add to the knowledge of the scientific community aimed explicitly at solar thermal energy technology. The report can also be used as a base to pursue solar thermal projects on an economic basis.

scholarly journals Performance Evaluation of Multiple Helical Tubes as a Receiver for Solar Parabolic Trough Collector

2020 ◽  
Vol 7 (1) ◽  
pp. 39-46
Author(s):  
Swapnil N. Lotake ◽  
M. M. Wagh
Keyword(s):  
Mass Flow ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Focal Point ◽  
Thermal Power ◽  
Heat Transfer Fluid ◽  
Parabolic Trough ◽  
Black Paint ◽  
Parabolic Trough Collector ◽  
Helical Tubes

Solar parabolic trough collector consists of a parabolic reflector with a central receiver at a focal point through which heat transfer fluid is passed. Parabolic trough collector is used mostly in solar thermal power plants for generating electricity. This paper describes the experimental results of two straight tubes wrapped over each other to form a helically shaped receiver. The receiver was tested with aluminium material with and without black paint over it. Also, the helical tube receiver was tested with a glass cover over it, at two different mass flow rates and, with and without manual tracking. The tested instantaneous thermal efficiency ranges from 31.26% to 45.28% and the overall thermal efficiency ranges from 14.9% to 31.41% during the experimental period. The instantaneous thermal efficiency increased by an average of 1.32 times for unpainted receiver and 1.36 times for black painted receiver with the increase in mass flow rate. By tracking the parabolic collector according to sun’s position, there is an average increase in instantaneous thermal efficiency by 1.1 times for unpainted receiver and 1.04 times for black painted receiver. The paper further reveals that the use of multiple helical tubes as a receiver for parabolic trough collector increases the overall efficiency of the collector in a substantial manner.

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