The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
S K Tyagi - One of the best experts on this subject based on the ideXlab platform.
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Exergetic analysis of Solar Concentrator aided coal fired super critical thermal power plant (SACSCTPT)
Clean Technologies and Environmental Policy, 2013Co-Authors: V. Siva Reddy, S C Kaushik, S K TyagiAbstract:Comparative energetic and exergetic analysis of coal-fired supercritical thermal power plant (CSCTPT) and Solar Concentrator aided coal fired supercritical thermal power plant (SACSCTPT) have been carried out in this article. Optical analysis of Linear Fresnel reflecting (LFR) Solar Concentrator is used to predict the effect of focal distance and width of reflector upon the local concentration ratio and the tilt (θ) angles that are important parameters for SACSCTPT performance studies. Energetic and exergetic analysis for evaluating the effect of concentration ratio and inlet temperature of the fluid on LFR Solar Concentrator are carried out. An instantaneous increase in power generation capacity of about 20 % is observed by substituting turbine bleed streams to all the low pressure and high pressure feed water heaters of CSCTPT with Solar Concentrator aided feed water heaters (SAFWH). Coal consumption is increased by 3.35 % for reheat of the steam by substitution of high pressure feed water heaters with SAFWH. Energetic efficiencies of SACSCTPT appear high as compared to the Solar alone thermal power plant and low as compared to coal-fired super critical thermal power plants. Furthermore, for a SAFWH, it is found that the land area requirement is 4.78 ha/MW.
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exergetic analysis of Solar Concentrator aided natural gas fired combined cycle power plant
Renewable Energy, 2012Co-Authors: Siva V Reddy, S C Kaushik, S K TyagiAbstract:This article deals with comparative energy and exergetic analysis for evaluation of natural gas fired combined cycle power plant and Solar Concentrator aided (feed water heating and low pressure steam generation options) natural gas fired combined cycle power plant. Heat Transfer analysis of Linear Fresnel reflecting Solar Concentrator (LFRSC) is used to predict the effect of focal distance and width of reflector upon the reflecting surface area. Performance analysis of LFRSC with energetic and exergetic methods and the effect, of concentration ratio and inlet temperature of the fluid is carried out to determine, overall heat loss coefficient of the circular evacuated tube absorber at different receiver temperatures. An instantaneous increase in power generation capacity of about 10% is observed by substituting Solar thermal energy for feed water heater and low pressure steam generation. It is observed that the utilization of Solar energy for feed water heating and low pressure steam generation is more effective based on exergetic analysis rather than energetic analysis. Furthermore, for a Solar aided feed water heating and low pressure steam generation, it is found that the land area requirement is 7 ha/MW for large scale Solar thermal storage system to run the plant for 24 h.
Tara Chandra Kandpal - One of the best experts on this subject based on the ideXlab platform.
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Optical performance analysis of a seasonally adjusted circular cylindrical Solar Concentrator
Energy Conversion and Management, 2003Co-Authors: Punita Taneja, S.s. Mathur, Tara Chandra KandpalAbstract:Abstract Optical performance of a seasonally adjusted circular cylindrical Solar Concentrator has been studied in detail, using three different absorber configurations. The effect of angle of incidence of direct Solar radiation, mirror rim angle, absorber size, mirror shading and absorber defocusing/lateral shift on the concentration characteristics is evaluated for the three absorber configurations.
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Thermal performance of a linear Fresnel reflector Solar Concentrator using a black liquid
Renewable Energy, 1992Co-Authors: Mohammed Nurul Islam, B.s. Negi, Tara Chandra KandpalAbstract:Results of some simple experiments conducted on a Linear Fresnel reflector Solar Concentrator using a tubular transparent corning glass absorber through which a highly absorbent black liquid is passed are presented in this short communication.
John L. Richter - One of the best experts on this subject based on the ideXlab platform.
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Optics of a two-trough Solar Concentrator
Solar Energy, 1996Co-Authors: John L. RichterAbstract:A linear focusing Solar Concentrator is described that uses two reflecting troughs, one is a large, stationary hemi-cylinder and the other is small and tracks the sun. The small reflector weighs less than a parabolic trough with the same Concentrator aperture therefore diurnal steering is more feasible. Energy is carried to the job by Solar heated fluid in a pipe at focus in the secondary reflector assembly. Theory is presented and comparisons are given for east-west and north-south oriented parabolic and two-trough collectors. In the ideal world, the parabolic outperforms the two-trough collector however in the real world, the simplifications due to the immobile, hemi-cylinder, large reflector may outweigh its disadvantages.
Hongfei Zheng - One of the best experts on this subject based on the ideXlab platform.
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performance investigation of a concentrating photovoltaic thermal system with transmissive fresnel Solar Concentrator
Energy Conversion and Management, 2016Co-Authors: Hongfei Zheng, Chaoqing Feng, Rui WangAbstract:Abstract A design method of a cycloidal transmissive Fresnel Solar Concentrator which can provide a certain width focal line was presented in this study. Based on the optical principle of refraction, the dimensions of each wedge-shaped element of Fresnel lens are calculated. An optical simulation has been done to obtain the optical efficiency of the Concentrator for different tracking error and axial incidence angle. It has been found that about 80% of the incident sunlight can still be gathered by the absorber when the tracking error is within 0.7°. When the axial angle of incidence is within 10°, it almost has no influence to the receiving rate. The concentrating photovoltaic/thermal system with transmissive Fresnel Solar Concentrator has been designed in this paper. Take the gallium arsenide high concentrated battery as the receiver, experimental research about cylindrical Fresnel concentrating photovoltaic/thermal system is undertaken in the real sky. Main parameters are tested such as the temperature distribution on receiver, electric energy and thermal energy outputs of concentrating photovoltaic/thermal system, the efficiency of multipurpose utilization of electric and heat, and so on. The test results in clear weather show that maximum electric generating efficiency is about 18% at noon, the maximum heat receiving rate of cooling water is about 45%. At noon time (11:00–13:00), the total efficiency of thermal and electricity can reach more than 55%. Performance of this concentrating photovoltaic/thermal system with transmissive Fresnel Solar Concentrator is studied and compared in two types typical weather, hazy weather and clear weather, it can be known from results that hazy weather has great influence to electric generation efficiency but it has less effect to heat efficiency of cooling water.
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Design and experimental analysis of a cylindrical compound Fresnel Solar Concentrator
Solar Energy, 2014Co-Authors: Hongfei Zheng, Chaoqing Feng, Jing DaiAbstract:Abstract This study presents the design of a cylinder shaped Solar Concentrator which is comprised of an arched Fresnel lens and a Fresnel mirror and a secondary reflector. An evacuated-tube or a concentrating photovoltaic cell can be used as the receiver being placed at the focus of the Concentrator. This cylindrical compound Fresnel Solar Concentrator may have the advantages of good weather resistance, low driving force during tracking, good appearance and easy modularization. The dimensions of the Fresnel lens and the Fresnel reflector are calculated on the basis of optical principle. An optical simulation tool is used to obtain the optical efficiency of the Concentrator for different incidence angles and therefore determine the allowable tracking error. It has been found that about 90% of the incident sunlight can still be gathered by the absorber when the tracking error is within 1.5°. Discussion is also made about the influence of the Solar azimuth angle on the optical efficiency. A preliminary measurement of the optical efficiency of a prototype cylindrical Concentrator is introduced. The experimental data generally agrees with the simulation result.
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experimental test of a novel multi surface trough Solar Concentrator for air heating
Energy Conversion and Management, 2012Co-Authors: Hongfei Zheng, Huifang Kang, Yuehong SuAbstract:Abstract This study presents the experimental test of a novel multi-surface trough Solar Concentrator for air heating. Three receivers of different air flow channels are individually combined with the Solar Concentrator. The air outlet temperature and Solar irradiance were recorded for different air flow rates under the real weather condition and used to determine the collection efficiency and time constant of the air heater system. The characteristics of the Solar air heater with different airflow channels are compared, and the variation of the daily efficiency with the normalized temperature change is also presented. The testing results indicates that the highest temperature of the air heater with a circular glass receiver can be over 140 °C. When the collection temperature is around 60 °C, the collection efficiency can be over 45%. For the rectangular receivers, the system also has a considerable daily efficiency at a larger air flow rate. The air heater based on the novel trough Solar Concentrator would be suitable for space heating and drying applications.
Abdulkarim Mayere - One of the best experts on this subject based on the ideXlab platform.
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A new trough Solar Concentrator and its performance analysis
Solar Energy, 2010Co-Authors: Zheng Hongfei, He Kaiyan, Abdulkarim MayereAbstract:The operation principle and design method of a new trough Solar Concentrator is presented in this paper. Some important design parameters about the Concentrator are analyzed and optimized. Their magnitude ranges are given. Some characteristic parameters about the Concentrator are compared with that of the conventional parabolic trough Solar Concentrator. The factors having influence on the performance of the unit are discussed. It is indicated through the analysis that the new trough Solar Concentrator can actualize reflection focusing for the sun light using multiple curved surface compound method. It also has the advantages of improving the work performance and environment of high-temperature Solar absorber and enhancing the configuration intensity of the reflection surface.
