Available energy of the air in solar chimneys and the possibility of its ground-level concentration

Ninić, Neven

doi:10.1016/j.solener.2005.05.010

Cited by 61 publications

(24 citation statements)

References 3 publications

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“…In the absence of cloud development, the presence of excess water in the chimney plume would have a negligible impact on plant performance beyond the thermodynamic effects noted previously be Kröger and Blaine [8] and Ninic [9]. The impact when cloud does form depends on the specifics of development, which again depend on the external environment.…”

Section: Implications For Facility Designmentioning

confidence: 96%

“…However, the impact of cloud formation would not occur in isolation, and it may be that the costs associated with excess water vapor and potential cloud formation would be offset by other gains. This is certainly a possibility if the water is added to the system to increase the potential energy of the parcel at the base of the chimney, as has been suggested by Ninic [9]. It may also be true that the gains realized by using the collector area for agriculture or by incorporating water-filled heat storage devices would outweigh the costs associated with evaporative losses.…”

Section: Implications For Facility Designmentioning

confidence: 99%

“…The potential impact of water vapor was discussed by Kröger and Blaine [8], who showed that moist air could improve plant performance. A more recent study by Ninic [9] also addressed this effect of water vapor on system efficiency, demonstrating that increasing the humidity at the collector inlet to the degree possible would maximize the potential energy of the air entering the base of the chimney. Ninic ultimately concluded that evaporating water in the collector would not be a cost effective means of increasing plant capacity, but also noted that increasing water vapor content of the air entering the collector would be beneficial.…”

Section: Introductionmentioning

confidence: 99%

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Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study

VanReken

Nenes

2009

Journal of Solar Energy Engineering

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The solar chimney power facility has the potential to become a valuable technology for renewable energy production. Its financial viability depends on a thorough understanding of the processes affecting its performance, particularly because of the large startup costs associated with facility design and construction. This paper describes the potential impacts on plant capacity resulting from cloud formation within or downwind of the solar chimney. Several proposed modifications to the basic concept of the solar chimney power facility have the potential to cause significant additions of water vapor to the air passing through the collector. As the air continues up through and out of the chimney, this excess water can condense to form cloud. This possibility is explored using a cloud parcel model initialized to simulate the range of expected operating conditions for a proposed solar chimney facility in southwestern Australia. A range of temperatures and updraft velocities are simulated for each of four seasonal representations and three levels of water vapor enhancement. Both adiabatic environments and the effects of entrainment are considered. The results indicate that for very high levels of water vapor enhancement cloud formation within the chimney is likely; at more moderate levels of water vapor enhancement the likelihood of plume formation is difficult to fully assess as the results depend strongly on the choice of entrainment rate. Finally, the impacts of these outcomes on facility capacity are estimated.2

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Section: Implications For Facility Designmentioning

confidence: 96%

Section: Implications For Facility Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study

VanReken

Nenes

2009

Journal of Solar Energy Engineering

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“…Ninic [129], in 2006, analyzed different types of collector with dry and humid air. The impact of the air humidity on increasing the operating potential and efficiency of the whole plant has also been analyzed.…”

Section: Analytical and Simulation Studiesmentioning

confidence: 99%

A review on solar chimney systems

Kasaeian

Molana

Rahmani

et al. 2017

Renewable and Sustainable Energy Reviews

151

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The increased utilization of solar energy has gained the attention of researchers to develop the solar chimney (SC) technology in recent years. Many studies have been conducted in this aear both experimentally and theoretically, whereas experimental studies are mainly focused on small-scale systems. This work provides a comprehensive and updated review that include most of the experimental studies, analytical and simulation works, the solar chimney applications, hybrid systems and geographical case studies based on extended references, citation of the updated works and the specified way of looking at different sections. The technological gaps in differnet sections are identified and a summary of suggestions is given for the future work, including more experimental works on the large-scale systems, and CFD analyses for optimization between the geometrical parameters and the output power. More studies on new applications of solar chimney technology including hybrid systems are also recommended.

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“…Solar chimney power generation system was presented by a German professor J.Schlaich in 1978 [1]. A pilot solar chimney power plant was constructed at Manzanares, Spain in 1981 [2][3][4].Since then, more and more researchers have shown strong interest in and studied such solar chimney power system for its huge potential of application all over the world [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Researches found that, from the viewpoint of thermodynamics, the solar chimney power system is an essential solar thermal power station, so it is restricted by the thermodynamics laws.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow heat transfer characteristics in solar chimneys integrated with seawater desalination

Zuo

Yuan

et al. 2012

International Conference on Sustainable Power Generation and Supply (SUPERGEN 2012)

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An unsteady-state mathematical model of the heat transfer and flow of the integrated system under no-load condition has been developed. The field distribution characteristics of the pressure, velocity and temperature of the integrated system have been researched. An optimization method based the temperature field distribution at the region where the wind turbine is placed has been proposed. The results show that the relative pressure within the system is negative value everywhere. The relative pressure and temperature are larger, the flowing is slowed down and the temperature distribution is non-uniform at the bottom of the center of the heat collector. The maximum negative pressure appears at the junction between the outlet of collector and the inlet of chimney, thus the place is the ideal region which the wind turbine will be installed. Optimizing the geometric dimensions of the local flow passage, the negative pressure and draft force can be significantly improved, and the speed can also be improved, and the energy loss can be obviously reduced. The flowing characteristics of the airflow in the collector changes little after the optimization of the geometric dimensions, the optimization does not basically affect on the freshwater production in the still.

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Available energy of the air in solar chimneys and the possibility of its ground-level concentration

Cited by 61 publications

References 3 publications

Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study

Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study

A review on solar chimney systems

Numerical analysis of flow heat transfer characteristics in solar chimneys integrated with seawater desalination

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