Thermal and technical analyses of solar chimneys

Schlaich Bergermann und Partner, Hohenzollernstr. 1, D-70178 Stuttgart, Germany
Solar Energy (Impact Factor: 3.47). 12/2003; 75(6):511-524. DOI: 10.1016/j.solener.2003.09.012

ABSTRACT An analysis for the solar chimneys has been developed, aimed particularly at a comprehensive analytical and numerical model, which describes the performance of solar chimneys. This model was developed to estimate power output of solar chimneys as well as to examine the effect of various ambient conditions and structural dimensions on the power output. Results from the mathematical model were compared with experimental results and the model was further used to predict the performance characteristics of large-scale commercial solar chimneys. The results show that the height of chimney, the factor of pressure drop at the turbine, the diameter and the optical properties of the collector are important parameters for the design of solar chimneys.

61 Reads
    • "Employing Computational Fluid Dynamics method and their turbine design, Ruprecht et al. presented results for a solar chimney with rated capacity of 200 MW [13]. A computer-aided analytical study has been illustrated by Bernardes and Weinrebe to investigate thermal features of the chimney [14]. Several researchers have shown interest in introducing models capable of predicting overall performance of the solar chimney such as Chitsomboon [7], Schlaich et al. [15], Tingzhen et al. [10], Zhou et al. [16] and Koonsrisuk and Chitsomboon [17]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, an improved concept design is presented to increase the thermal efficiency of the Rankine cycle of a typical steam power plant by combining a solar chimney and a dry cooling tower. The sources of the wind energy generation, include: the rejected heat from condenser to the air entering dry cooling tower, solar radiation and the airlift pumping effect on the air flow created by the stack hot flue gas which is injected into the hybrid tower as a novel change. This research primarily focuses on the Shahid Rajaee 250 MW steam power plant to determine the velocity of generated flow at the turbine inlet; a numerical finite volume code was employed for a dry cooling tower having a base diameter and a chimney height of 250 and 200 m, respectively. Calculations have been iterated for different angles of chimney walls, slopes of collectors and the base ground to find their effects on the output power. A range of 360 kW to more than 4.4 MW power is captured by the wind turbine by changing the hybrid tower geometrical parameters. Obtained results reveal a maximum of 0.538% increase for the thermal efficiency of the fossil fuel power plant.
    Energy Conversion and Management 04/2015; 94. DOI:10.1016/j.enconman.2015.01.044 · 4.38 Impact Factor
  • Source
    • "Mathematical models were built to analyze the system performance (Haaf et al., 1983; Pasumarthi and Sherif, 1998a; Pretorius and Krö ger, 2006b), the solar collector performance (Gannon and von Backstrom , 2000), the chimney performance (Ming et al., 2011; von Backströ m et al., 2003; Zhou et al., 2009d), the turbine characteristics (Denantes and Bilgen, 2006; Fluri and von Backström, 2008a,b; Gannon and von Backströ m, 2003), and the airflow compressibility (von Backstrom, 2003; von Backstrom and Gannon, 2000). Further advanced mathematical models were established for the parameters sensitivity analysis (Petela, 2009; Pretorius and Krö ger, 2007), the heat transfer coefficients (Bernardes et al., 2009, 2003), the configuration dimensionless similarity (Koonsrisuk and Chitsomboon, 2007, 2009; Koonsrisuk et al., 2010; Onyango and Ochieng, 2006) and the environmental and atmospheric effects (Harte and van Zijl, 2007; Ninic, 2006; VanReken and Nenes, 2009; Zhou et al., 2012, 2009a, 2008). Numerical analyses were carried out to simulate the inner performance, such as the pressure, velocity and temperature fields and the turbine performance (Chergui et al., 2010; Ming et al., 2008a, 2006, 2008b; Onyango and Ochieng, 2006; Pastohr et al., 2004; Zhou et al., 2009e), and to optimize the structure and system operation strategy (Bernardes and von Backstrom, 2010; Kirstein and von Backstrom, 2006; Maia et al., 2009, 2011; Pretorius and Krö ger, 2006a). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The solar chimney power plant (SCPP) is dominated by the solar radiation, and therefore its discontinuous operation is an unavoidable problem. In this paper, low temperature geothermal water is introduced into the SCPP for overcoming this problem. Based on a developed transient model, theoretical analyses are carried out to investigate the performance of the geothermal–solar chimney power plant (GSCPP) with main dimensions the same as the Manzanares prototype in Spain. Three operation models, viz. the full solar model, the full geothermal model and the geothermal–solar combined model are compared in typical summer and winter days and throughout the year. It is found that the GSCPP can attractively run in the GSM to deliver power continuously. Due to the ambient-dependant geothermal water outlet temperature, introducing the geothermal water makes greater contribution in winter days than in summer days, in the night than in the daytime. Power generation under GSM is larger than the sum of FSM and FGM. GSM is not the simple superposition of FSM and FGM, but makes better utilization of solar and geothermal energy. In addition, introducing high temperature and mass flow rate geothermal water can doubled and redoubled improve the GSCPP’s power capacity.
    Energy Conversion and Management 08/2014; 84:186–195. DOI:10.1016/j.enconman.2014.04.015 · 4.38 Impact Factor
  • Source
    • "With chimney height and diameter of 60 m and 3 m, respectively, it was capable of generating about 400 W power in solar radiation of 800 W/m 2 (Gholamalizadeh and Mansouri, 2013). Bernardes et al. (2003) developed a mathematical model to investigate effect of various construction conditions on the power output. Their model was validated with the experimental data from the Manzanares prototype. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this communication, a multi-objective optimization method is implemented using evolutionary algorithm techniques in order to determine optimum configuration of solar chimney power plant. The two objective functions which are simultaneously considered in the analysis are power output and capital cost of the plant. Power output of the system is maximized while capital cost of the component is minimized. Design parameters of the considered plant include collector diameter (D-coll), chimney height (H-ch) and chimney diameter The results of optimal designs are obtained as a set of multiple optimum solutions, called 'the Pareto frontier'. For some sample points of Pareto, optimal geometric is presented. In addition, effect of changing design variables on both objective functions is performed. This multi-objective optimization approach is very helpful and effective for selecting optimal geometric parameters of solar chimney power plants. The results show that, power output of the plant increases linearly when solar irradiation increases and increase in ambient temperature causes slight decrease in power output of the plant.
    Solar Energy 07/2014; 105(C):603-612. DOI:10.1016/j.solener.2014.04.006 · 3.47 Impact Factor
Show more


61 Reads