Numerical Comparison of Elliptical and Conical Cavity Receiver of Solar Parabolic Dish Collector System

2022 ◽  
pp. 607-618
Author(s):  
M. Tharun ◽  
S. R. Navin ◽  
K. Arjun Singh ◽  
Arivazhagan Sampathkumar ◽  
Sendhil Kumar Natarajan
Keyword(s):  
Numerical Comparison ◽  
Conical Cavity ◽  
Collector System ◽  
Parabolic Dish

scholarly journals Comparative Study of Modified Conical Cavity Receiver With Other Receivers for Solar Paraboloidal Dish Collector System

2021 ◽  
Author(s):  
Arjun Singh K ◽  
SENDHIL KUMAR NATARAJAN
Keyword(s):  
Heat Losses ◽  
Comsol Multiphysics ◽  
The Novel ◽  
Step Size ◽  
Conical Cavity ◽  
Collector System ◽  
Parabolic Dish ◽  
Institute Of Technology ◽  
Conversion Technologies ◽  
Minimum Heat

Abstract Solar Parabolic Dish Concentrators are one of the most efficient solar power conversion technologies. The cavity receivers are most common type, used for reducing the heat losses from the receiver. In this paper a novel cavity receiver is proposed and the objective is to compare the novel modified conical cavity receiver with the existing cavity receivers such as cylindrical, conical and modified cavity receivers. The cavity receivers are designed for the parabolic dish of 4m diameter which is installed at National Institute of Technology Puducherry, India. Ray tracing analysis is carried out to determine the size of the receiver. The analysis was carried out for various orientations of the receivers from 0° to 90° with a step size of 15° and also for the cavity temperatures: 300℃, 400℃, 500℃, 600℃ and 700℃. Based on the results obtained the modified conical cavity receiver is found to be the best design in terms of minimum heat losses compared to other receivers. The next best choices are found to be modified cavity, conical cavity and cylindrical cavity receiver. The whole analysis is conducted with a developed model in COMSOL Multiphysics.

scholarly journals Integration of a Solar Parabolic Dish Collector with a Small-Scale Multi-Stage Flash Desalination Unit: Experimental Evaluation, Exergy and Economic Analyses

2021 ◽  
Vol 13 (20) ◽  
pp. 11295
Author(s):  
Ali Babaeebazaz ◽  
Shiva Gorjian ◽  
Majid Amidpour
Keyword(s):  
Solar Radiation ◽  
Flow Rate ◽  
Quality Parameters ◽  
Small Scale ◽  
Conical Cavity ◽  
Multi Stage ◽  
Circulation Circuit ◽  
Parabolic Dish ◽  
Economic Analyses ◽  
The Cost

In this study, a small-scale two-stage multi-stage flash (MSF) desalination unit equipped with a vacuum pump and a solar parabolic collector (PDC) with a conical cavity receiver were integrated. To eliminate the need for heat exchangers, a water circulation circuit was designed in a way that the saline feedwater could directly flow through the receiver of the PDC. The system’s performance was examined during six days in July 2020, from 10:00 a.m. to 3:00 p.m., under two distinct scenarios of the MSF desalination operation under the vacuum (−10 kPa) and atmospheric pressure by considering three saline feedwater water flow rates of 0.7, 1 and 1.3 L/min. Furthermore, the performance of the solar PDC-MSF desalination plant was evaluated by conducting energy and exergy analyses. The results indicated that the intensity of solar radiation, which directly affects the top brine temperature (TBT), and the values of the saline feedwater flow rate have the most impact on productivity. The maximum productivity of 3.22 L per 5 h in a day was obtained when the temperature and saline feedwater flow rate were 94.25 °C (at the maximum solar radiation of 1015.3 W/m2) and 0.7 L/min, respectively, and the MSF was under vacuum pressure. Additionally, it was found that increasing the feedwater flow rate from 0.7 to 1.3 L/min reduces distillate production by 76.4% while applying the vacuum improves the productivity by about 34% at feedwater flow rate of 0.7 L/min. The exergy efficiency of the MSF unit was obtained as 0.07% with the highest share of exergy destruction in stages. The quality parameters of the produced distillate including pH, TDS, EC and DO were measured, ensuring they lie within the standard range for drinking water. Moreover, the cost of freshwater produced by the MSF plant varied from 37 US$/m3 to 1.5 US$/m3 when the treatment capacity increased to 8000 L/day.

scholarly journals Prediction of Focal Image for Solar Parabolic Dish Concentrator With Square Facets – An Analytical Model

2021 ◽  
Author(s):  
Arjun Singh Kopalakrishnaswami ◽  
Reyhaneh Loni ◽  
Ghoalmhosein Najafi ◽  
SENDHIL KUMAR NATARAJAN
Keyword(s):  
Electrical Power ◽  
Efficient Design ◽  
Aperture Diameter ◽  
Collector System ◽  
Image Dimension ◽  
Proposed Model ◽  
Parabolic Dish ◽  
Influencing Parameters ◽  
Parabolic Dish Concentrator ◽  
Good Agreement

Abstract Solar parabolic dish concentrator is one of the high-temperature applications of more than 400 °C for thermal and electrical power generation. In the solar parabolic dish concentrator, the arrangement of reflectors over the surface area is the significant factor for effective concentration of solar radiation. Also, focal image is one of the most influencing parameters in the design of receiver. Among the various reflectors, the square shaped reflectors (facets) are comparatively effective in converging the incoming radiations to attain better focal image. In this regard, an attempt has been made to predict the focal image diameter of a solar parabolic dish concentrator with a square facet of different influencing parameters using a novel mathematical model. The influencing parameters considered for the study are aperture diameter, rim angle, and facet length of the dish concentrator. Based on the proposed model, the focal image dimension and aperture area of a solar parabolic dish concentrator with square facets can be predicted accurately for efficient design of a solar parabolic dish collector system. Finally, the proposed model is validated with the experimentally obtained focal image diameter and it is observed that the predicted result is in good agreement with the experimental one. Thus, the proposed model can be effectively used for the design of parabolic dish system for sustainable development.

Thermal Performance of Solar Parabolic Dish Concentrator with Hetero-Conical Cavity Receiver

2015 ◽  
Vol 787 ◽  
pp. 197-201 ◽  
Author(s):  
V. Thirunavukkarasu ◽  
M. Cheralathan
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
High Efficiency ◽  
Heat Transfer Fluid ◽  
Solar Collectors ◽  
Metal Tube ◽  
Conical Cavity ◽  
Concentrated Solar Energy ◽  
Parabolic Dish ◽  
Parabolic Dish Concentrator

Concentrated solar collectors have high efficiency as compared to flat plate and evacuated tube solar collectors. Cavity receivers are mainly used on the parabolic dish concentrators and tower type concentrator systems. The heat transfer surfaces of cavity receiver are composed by coiled metal tube. Heat transfer fluid flows in the internal spaces of coiled metal tube, and the external surfaces would absorb the highly concentrated solar energy. This paper explains the thermal performance of parabolic dish concentrator system with hetero-conical cavity receiver. The experimental analysis was done during the month of April 2014 on clear sunny days at Chennai [Latitude: 13.08oN, Longitude: 80.27oE] to study its thermal performance.

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