This work investigated the prediction of the optimum height and tilt angle of the solar receiver of a 30 kWe solar tower power plant for the electricity production in the Sahelian zone. Initially, ...the solar field is sized to determine the total reflecting surface area of the mirrors and the number of heliostats. A PS10-like radially staggered heliostat field is used to design the heliostat layout in the field using a Matlab code. The concentrated solar flux at the input of the receiver was determined using Soltrace software by the Monte Carlo ray tracing (MCRT) method. The sizing results show that the total reflecting surface area is 350 m2 for an optical efficiency of 76.4% and a reference DNI of 600 W/m2. The solar field layout indicates 175 heliostats of 2 m2 surface area and 1.5 m height each. The simulation results show that the optimum height and tilt angle of the solar receiver are 26 m and 65°, respectively.
This work investigated the prediction of the optimum height and tilt angle of the solar receiver of a 30kWe solar tower power plant for the electricity production in the Sahelian zone. Initially, the ...solar field is sized to determine the total reflecting surface area of the mirrors and the number of heliostats. A PS10-like radially staggered heliostat field is used to design the heliostat layout in the field using a Matlab code. The concentrated solar flux at the input of the receiver was determined using Soltrace software by the Monte Carlo ray tracing (MCRT) method. The sizing results show that the total reflecting surface area is 350msup.2 for an optical efficiency of 76.4% and a reference DNI of 600W/msup.2. The solar field layout indicates 175 heliostats of 2msup.2 surface area and 1.5m height each. The simulation results show that the optimum height and tilt angle of the solar receiver are 26m and 65°, respectively.
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•A 3D-CPC was designed for an indirectly irradiated solar receiver.•MCRT results are used to provide boundary conditions to the CFD model.•Volumetric heat source is implemented in ...Ansys Fluent by UDFs Functions.•The effects of geometric parameters and porous properties are analyzed and discussed.•Performance of the receiver were improved by using 3D-CPC and other parameters.
Solar Tower Power Plant (STPP) require a high concentration ratio to provide high working fluid temperatures for power generation. Three-dimensional Compound Parabolic Concentrator (3D-CPC) can be used to increase the concentration ratio in the receiver. This paper estimates the air outlet temperature of an indirectly irradiated solar receiver equipped with a 3D-CPC for STPP. For this purpose, the STPP subsystems such as the heliostat field, the 3D-CPC and the receiver are sized for an electrical power of 30 kW. An in-house Matlab code is developed and executed the configuration of the heliostats in the field. The result of the Monte Carlo ray tracing (MCRT) method is used to provide boundary conditions to the Computational Fluids Dynamics (CFD) model. The CFD model is used to simulate the conjugate heat transfer in the receiver. Based on this, a heat source is created from the solar rays absorbed in the receiver. This heat source is implemented as a volumetric heat source in Ansys Fluent by UDFs functions. Thus, the in-house Matlab code is validated by simulating the PS-10 heliostat field and the CFD model is also validated by simulating the Weizmann heliostat field. The results show that the solar field is consisted of 175 heliostats of 2 m2 surface area and 1.5 m height each. The 3D-CPC truncated at 35° increased the concentration ratio by a factor of 4.91 for an optical efficiency of 80.66 %. A receiver mesh count of 1,076,958 gave convergence of the air outlet temperature. 1.5 × 106 rays are found to get independence of the absorbed heat flux in the receiver. The temperature found on the heated solid is 1063.4 K. For a porosity of 56.02 % and a mass flow rate of 0.11 kg/s, a temperature of 1218 K is reached at the outlet of the receiver. The results show that the use of a 3D-CPC increase the concentration ratio and, consequently improve the thermal performance of the receiver. It is important to note that, parameters such as mass flow rate and porosity have a strong influence on the air outlet temperature.
Top 100 Cited Foot and Ankle-Related Articles DeHeer, Patrick A; Adams, William; Grebenyuk, Faye-Rose ...
Journal of the American Podiatric Medical Association,
11/2016, Letnik:
106, Številka:
6
Journal Article
Recenzirano
Article citations are a well-accepted method of evaluating the influence or impact of a particular article. Other medical specialties have published the top cited articles in their specialty. To ...date, an analysis of the foot and ankle podiatric medicine-related article citation method has not been published.
Three citation indices were used on October 10, 2014, February 20, 2015, and May 1, 2015, to determine the top 100 cited foot and ankle-related articles.
Most of the top 100 cited foot and ankle podiatric medicine-related articles were published in The Journal of Bone and Joint Surgery by medical doctors in the United States in the past two decades, with most of the article topics being the diabetic foot or trauma. The predominant level of evidence for the articles is evenly distributed among levels III, IV, and V.
Podiatric medical research and publication has made great strides during the past two decades, particularly in the diabetic foot, but continued research and peer-reviewed journal publication in additional areas regarding the foot and ankle must become a priority in the podiatric medical community.
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