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Scientific Publications Year 2009 for Solar Updraft Chimneys

The 3rd International Conference on Solar Updraft Tower Power will take place from 26 to 28 October, 2012 at Huazhong University of Science and Technology, in Wuhan, China.
The homepage of the 3rd International Conference on Solar Updraft Tower Power Technology 2012 (SUTPT 2012) is available at http://www.sutpt2012.org .


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Scientific Publications in English
Title - Author – Reference - Abstract

Accuracy of theoretical models in the prediction of solar chimney performance
Solar Energy, Volume 83, Issue 10, October 2009, Pages 1764-1771
Atit Koonsrisuk, Tawit Chitsomboon
Abstract
A solar chimney is a solar power plant which generates mechanical energy (usually in terms of turbine shaft work) from a rising hot air that is heated by solar energy. The present paper compares the predictions of performances of solar chimney plants by using five simple theoretical models that have been proposed in the literature. The parameters used in the study were various plant geometrical parameters and the insolation. Computational Fluid Dynamics (CFD) simulation was also conducted and its results compared with the theoretical predictions. The power output and the efficiency of the solar chimney plants as functions of the studied parameters were used to compare relative merits of the five theoretical models. Models that performed better than the rest are finally recommended.

A single dimensionless variable for solar chimney power plant modeling
Solar Energy, Volume 83, Issue 12, December 2009, Pages 2136-2143
Atit Koonsrisuk, Tawit Chitsomboon
Abstract
The solar chimney power plant is a relatively new technology for generating electricity from solar energy. In this paper dimensional analysis is used together with engineering intuition to combine eight primitive variables into only one dimensionless variable that establishes a dynamic similarity between a prototype and its scaled models. Three physical configurations of the plant were numerically tested for similarity: fully geometrically similar, partially geometrically similar, and dissimilar types. The values of the proposed dimensionless variable for all these cases were found to be nominally equal to unity. The value for the physical plant actually built and tested previously was also evaluated and found to be about the same as that of the numerical simulations, suggesting the validity of the proposition. The physical meaning of this dimensionless (similarity) variable is also interpreted; and the connection between the Richardson number and this new variable was found. It was found also that, for a fixed solar heat flux, different-sized models that are fully or partially geometrically similar share an equal excess temperature across the roof outlet.

Partial geometric similarity for solar chimney power plant modeling
Solar Energy, Volume 83, Issue 9, September 2009, Pages 1611-1618
Atit Koonsrisuk, Tawit Chitsomboon
Abstract
A solar chimney power plant derives its mechanical power from the kinetic power of the hot air which rises through a tall chimney, the air being heated by solar energy through a transparent roof surrounding the chimney. In our previous studies, the achievement of complete dynamic similarity between a prototype and its models imposed the use of different solar heat fluxes between them. It is difficult to conduct an experiment by using dissimilar heat fluxes with different physical models. Therefore, this study aimed to maintain dynamic similarity for a prototype and its models while using the same solar heat flux. The study showed that, to achieve the same-heat-flux condition, the roof radius between the prototype and its scaled models must be dissimilar, while all other remaining dimensions of the models are still similar to those of the prototype. In other words, the models are ‘partially’ geometrically similar to the prototype. The functional relationship that provides the condition for this partial similarity is proposed and its validity is proved by scaling the primitive numerical solutions of the flow. Engineering interpretations of the similarity variables are also presented.

Analysis of chimney height for solar chimney power plant
Applied Thermal Engineering, Volume 29, Issue 1, January 2009, Pages 178-185
Xinping Zhou, Jiakuan Yang, Bo Xiao, Guoxiang Hou, Fang Xing
Abstract
Current in solar chimney power plant that drives turbine generators to generate electricity is driven by buoyancy resulting from higher temperature than the surroundings at different heights. In this paper, the maximum chimney height for convection avoiding negative buoyancy at the latter chimney and the optimal chimney height for maximum power output are presented and analyzed using a theoretical model validated with the measurements of the only one prototype in Manzanares. The results based on the Manzanares prototype show that as standard lapse rate of atmospheric temperature is used, the maximum power output of 102.2 kW is obtained for the optimal chimney height of 615 m, which is lower than the maximum chimney height with a power output of 92.3 kW. Sensitivity analyses are also performed to examine the influence of various lapse rates of atmospheric temperatures and collector radii on maximum height of chimney. The results show that maximum height gradually increases with the lapse rate increasing and go to infinity at a value of around 0.0098 K m−1, and that the maximum height for convection and optimal height for maximum power output increase with larger collector radius.

Analysis of some available heat transfer coefficients applicable to solar chimney power plant collectors
Solar Energy, Volume 83, Issue 2, February 2009, Pages 264-275
Marco Aurélio dos Santos Bernardes, Theodor W. Von Backström, Detlev G. Kröger
Abstract
A solar chimney power plant consists of a translucent collector which heats the air near the ground and guides it into the base of a chimney at its centre. The buoyant air rises in the chimney and electricity is generated through one or more turbines in or near the base of the chimney. Various studies about solar chimney power plant performance have been published. Different calculation approaches with a variety of considerations have been applied to calculate chimney power plant performance. In particular, two comprehensive studies are relevant, namely those of (Bernardes, M.A.d. S., Voß, A., Weinrebe, G., 2003. Thermal and technical analyses of solar chimneys. Solar Energy 75, 511–524; Pretorius, J.P., Kröger, D.G., 2006b. Solar chimney power plant performance. Transactions of the ASME 128, 302–311). The paper compares the methods used to calculate the heat fluxes in the collector, and their effects on solar chimney performance. Reasons for the discrepancies between the predictions of the two models are given. In general the Pretorius model produces higher heat transfer coefficients and higher heat rate fluxes for both the roof and for the ground surfaces. The two approaches lead to very similar air temperature rises in the collector and thus, similar produced power.

Theoretical evaluation of the influence of geometric parameters and materials on the behavior of the airflow in a solar chimney
Computers & Fluids, Volume 38, Issue 3, March 2009, Pages 625-636
Cristiana B. Maia, André G. Ferreira, Ramón M. Valle, Márcio F.B. Cortez
Abstract
An analytical and numerical study of the unsteady airflow inside a solar chimney was performed. The conservation and transport equations that describe the flow were modeled and solved numerically using the finite volumes technique in generalized coordinates. The numerical results were physically validated through comparison with the experimental data. The developed model was used for airflow simulation in solar chimneys with operational and geometric configurations different from those found in the experimental prototype. Analysis showed that the height and diameter of the tower are the most important physical variables for solar chimney design.
Article Outline
1. Introduction
2. Mathematical model
3. Experimental prototype and numerical methodology validation
4. Results and discussion
4.1. Influence of the tower radius
4.2. Influence of the tower height
4.3. Influence of the cover radius
4.4. Influence of the cover height
5. Conclusions


ReferencesNumerical investigation of a plume from a power generating solar chimney in an atmospheric cross flow
Atmospheric Research, Volume 91, Issue 1, January 2009, Pages 26-35
Xinping Zhou, Jiakuan Yang, Reccab M. Ochieng, Xiangmei Li, Bo Xiao
Abstract
A plume in an atmospheric cross flow from a power generating solar chimney is investigated using a three-dimensional numerical simulation model. The simulation model is validated by comparing the data calculated using our model with the numerical simulated results for one-dimensional buoyancy-driven compressible flow in a proposed 1500 m high solar chimney. In this paper, the parametric performances including static pressure, static temperature, density, streamline, and relative humidity field of the flow at the symmetry plane, at the cross plane 2700 m high and at the cross plane 750 m high in the geometry are simulated. It is found that relative humidity of the plume is greatly increased due to the jet of a plume into the surroundings colder than the plume. In addition to a great amount of tiny granules in the plume originating from the ground as effective condensation nuclei of moisture, a condensation would occur, a cloud system and precipitation e.g. rainfall, snow and hail would be formed around the plume when vapor is supersaturated. It is also found that with an increase in chimney height or relative humidity of atmosphere, or a reduction in wind velocity, relative humidity is increased, and increases the probability of precipitation and the potential precipitation areas. Furthermore, the latent heat released from the condensation of supersaturated vapor can aid the plume to keep on rising.

Economic analysis of power generation from floating solar chimney power plant
Renewable and Sustainable Energy Reviews, Volume 13, Issue 4, May 2009, Pages 736-749
Xinping Zhou, Jiakuan Yang, Fen Wang, Bo Xiao
Abstract
Solar chimney thermal power technology that has a long life span is a promising large-scale solar power generating technology. This paper performs economic analysis of power generation from floating solar chimney power plant (FSCPP) by analyzing cash flows during the whole service period of a 100 MW plant. Cash flows are influenced by many factors including investment, operation and maintenance cost, life span, payback period, inflation rate, minimum attractive rate of return, non-returnable subsidy rate, interest rate of loans, sale price of electricity, income tax rate and whether additional revenue generated by carbon credits is included or not. Financial incentives and additional revenue generated by carbon credits can accelerate the development of the FSCPP. Sensitivity analysis to examine the effects of the factors on cash flows of a 100 MW FSCPP is performed in detail. The results show that the minimum price for obtaining minimum attractive rate of return (MARR) of 8% reaches 0.83 yuan (kWh)−1 under financial incentives including loans at a low interest rate of 2% and free income tax. Comparisons of economics of the FSCPP and reinforced concrete solar chimney power plant or solar photovoltaic plant are also performed by analyzing their cash flows. It is concluded that FSCPP is in reality more economical than reinforced concrete solar chimney power plant (RCSCPP) or solar photovoltaic plant (SPVP) with the same power capacity.
Article Outline
1. Introduction
2. Floating solar chimney power plant (FSCPP)
3. Investment
3.1. Cost of collector
3.2. Cost of FSC
3.3. Cost of PCU
4. Expense and revenue analysis
4.1. Revenue analysis
4.2. Expense analysis
5. Results and discussion
5.1. Sensitivity analysis
5.2. Effect of inflation rate
5.3. Effect of MARR
5.4. Effect of non-returnable subsidy
5.5. Effect of interest rate of loans
5.6. Effect of income tax rate
5.7. Effect of electricity sale price
5.8. Effect of revenue generated by carbon credits
5.9. Effect of depreciation on capital
6. Comparison of FSCPP with reinforced concrete solar chimney power plant
7. Comparison of FSCPP with solar photovoltaic plant
8. Conclusions
Acknowledgements
References


Cost analysis of solar chimney power plants
Solar Energy, Volume 83, Issue 2, February 2009, Pages 246-256
T.P. Fluri, J.P. Pretorius, C. Van Dyk, T.W. Von Backström, D.G. Kröger, G.P.A.G. Van Zijl
Abstract
Several cost models for large-scale solar chimney power plants are available in the literature. However, the results presented vary significantly, even in cases where the input parameters and the used models are supposedly very similar. The main objective of this paper is to clarify this matter by comparing previous cost models to a newly developed alternative model. Further, the impact of carbon credits on the levelised electricity cost is also investigated.
A reference plant is introduced, with dimensions and financial parameters chosen specifically for the purpose of making the results of this analysis comparable to those of previous publications. Cost models are presented for the main components of a solar chimney power plant, i.e. the collector, the chimney and the power conversion unit. Results show that previous models may have underestimated the initial cost and levelised electricity cost of a large-scale solar chimney power plant. It is also shown that carbon credits significantly reduce the levelised electricity cost for such a plant.
Article Outline
Nomenclature
1. Introduction
2. Plant performance
3. Component design and cost
3.1. Chimney
3.2. Collector
3.3. Power conversion unit (PCU)
3.4. Component cost summary
4. Electricity cost calculations
4.1. Configuration II
4.2. Configuration III
5. Impact of carbon credits
6. Conclusions
Acknowledgements
Appendix A. Collector loading and support structure design
A.1. Loading
A.2. Support structure design
Appendix B. Design and cost model of the power conversion unit (PCU)
B.1. Turbine rotor blades
B.2. Pitch bearings
B.3. Rotor hub
B.4. Rotor shaft
B.5. Rotor bearings
B.6. Generator/power electrical converter
B.7. Control system
B.8. Turbine casing and duct
B.9. Support structure
B.10. Central structure
B.11. Balance of station
B.12. Results
References


Thermodynamic study of a simplified model of the solar chimney power plant
Solar Energy, Volume 83, Issue 1, January 2009, Pages 94-107
Richard Petela
Abstract
A simplified model of solar chimney power plant (SCPP) consists of a heating air collector, turbine and chimney. Thermodynamic interpretation of processes occurring in these SCPP components is based on the derived energy and exergy balances. The examples of the energy and exergy flow diagrams show how the SCPP input of 36.81 MW energy of solar radiation, corresponding to 32.41 MW input of radiation exergy, is distributed between the SCPP components. Responsive trends to the varying input parameters are studied. Additionally, the concept of mechanical exergy (ezergy) of air is applied and it allowed for quantitative determination of the effect attributed to the terrestrial gravity field on the component processes of the SCPP.
Article Outline
Nomenclature
1. Introduction
2. The main assumptions for the simplified mathematical model of the SCPP
3. Energy analysis
4. Exergy analysis
5. Exergy analysis with using mechanical exergy component for substance
6. Responsive trends to the varying input parameters
7. Conclusions
Acknowledgements
References


Elementary theory of stationary vortex columns for solar chimney power plants
Solar Energy, Volume 83, Issue 4, April 2009, Pages 462-476
N. Ninic, S. Nizetic
Abstract
This paper aims to develop and make use of the availability of warm, humid air. In particular, we focus on the possibility that this availibility can be concentrated at the ground level without using a solid “chimney”. The results reveal that this concentration can be achieved via the formation of an updraft “gravitational vortex column” (GVC) situated over turbines. A simplified physical and analytical GVC model is developed in this paper. A numerical solution is given for a characteristic case, with a GVC process as a part of the cycle, similar to the Brayton cycle obtained in a gravitational field.

Examining potential benefits of combining a chimney with a salinity gradient solar pond for production of power in salt affected areas
Solar Energy, Volume 83, Issue 8, August 2009, Pages 1345-1359
Aliakbar Akbarzadeh, Peter Johnson, Randeep Singh
Abstract
The concept of combining a salinity gradient solar pond with a chimney to produce power in salt affected areas is examined. Firstly the causes of salinity in salt affected areas of northern Victoria, Australia are discussed. Existing salinity mitigation schemes are introduced and the integration of solar ponds with those schemes is discussed. Later it is shown how a solar pond can be combined with a chimney incorporating an air turbine for the production of power. Following the introduction of this concept the preliminary design is presented for a demonstration power plant incorporating a solar pond of area 6 hectares and depth 3 m with a 200 m tall chimney of 10 m diameter. The performance, including output power and efficiency of the proposed plant operating in northern Victoria is analysed and the results are discussed. The paper also discusses the overall advantages of using a solar pond with a chimney for production of power including the use of the large thermal mass of a solar pond as a practical and efficient method of storing collected solar energy.
Article Outline
Nomenclature
1. Introduction
2. Solar pond basics
3. Causes of salinity, existing salinity mitigation schemes and the integration of solar ponds into salt works
4. Chimney incorporating an air turbine as a candidate for the heat engine for power generation from a solar pond
5. Integration of solar pond and solar chimney into salt works
6. Some notes on potential benefits of combining a solar pond with a tower for power production in salt affected areas
7. Types of heat exchanger
8. First demonstration project at RMIT of the concept of combining a tower with a solar pond
9. Conceptual design and preliminary sizing of a demonstration solar pond integrated with a salt works and combined with a chimney for production of power
9.1. Preliminary design and the initial salt and water requirements for the six hectares solar pond
9.2. Low salinity water required for maintenance of the salinity gradient
9.3. High salinity water required for maintenance of the salinity gradient
9.4. Solar pond performance and the estimated thermal energy output
9.5. Heat exchanger
9.5.1. Indirect contact heat exchanger
9.5.2. Direct contact heat exchanger
9.6. Performance modelling of solar pond integrated with a chimney
10.Analysis and discussion of the results
11. Conclusions and further remarks
Acknowledgements
References


Novel concept for producing energy integrating a solar collector with a man made mountain hollow
Energy Conversion and Management, Volume 50, Issue 3, March 2009, Pages 847-854
Xinping Zhou, Jiakuan Yang, Jinbo Wang, Bo Xiao
Abstract
The concept of the solar chimney thermal power technology was proven with the successful operation of the Manzanares prototype built in the 1980s. However, all previous attempts at producing energy from a commercial solar chimney thermal power plant on a large scale have failed because of bad engineering and safety. A novel concept for producing energy by integrating a solar collector with a mountain hollow is presented and described. Solar energy is collected in the collector and heats the ground, which is used to store heat energy and heat the indoor air. Then, the hot air is forced by the pressure difference between it and the ambient air to move along the tilted segment and up the vertical segment of the ‘chimney’, driving the turbine generators to generate electricity. The mountain hollow, formed by excavation in a large-elevation mountain, can avoid the safety issues of erecting a gigantic concrete chimney, which is needed for commercial solar chimney thermal power plants. Furthermore, it can also save a great amount of construction materials for constructing a robust chimney structure and reduce the energy cost to a level less than that of a clean coal power plant, providing a good solution to the reclamation and utilization of undeveloped mountains, especially in mountainous countries.

Hot air balloon engine
Renewable Energy, Volume 34, Issue 4, April 2009, Pages 1100-1105
Ian Edmonds
Abstract
This paper describes a solar powered reciprocating engine based on the use of a tethered hot air balloon fuelled by hot air from a glazed collector. The basic theory of the balloon engine is derived and used to predict the performance of engines in the 10 kW to 1 MW range. The engine can operate over several thousand metres altitude with thermal efficiencies higher than 5%. The engine thermal efficiency compares favorably with the efficiency of other engines, such as solar updraft towers, that also utilize the atmospheric temperature gradient but are limited by technical constraints to operate over a much lower altitude range. The increased efficiency allows the use of smaller area glazed collectors. Preliminary cost estimates suggest a lower $/W installation cost than equivalent power output tower engines.
Article Outline
1. Introduction
2. Description of the balloon engine
3. Theory of the balloon engine
4. Predicted performance of the balloon engine
5. Cost estimates
6. Discussion
7. Conclusion
References


Glasses for solar energy conversion systems
Journal of the European Ceramic Society, Volume 29, Issue 7, April 2009, Pages 1203-1210
J. Deubener, G. Helsch, A. Moiseev, H. Bornhöft
Abstract
Solar technologies are projected to increase tremendously over the next 10 years. Glasses are playing an important role as transparent materials of photovoltaic (PV) cells and concentrating solar power (CSP) systems. Glasses are materials of short energy payback time and environmental compatibility suitable for sustainable energy concepts. The paper reviews recent solar applications. Surface structuring and coating of glasses are shown to improve energy efficiency for solar conversion systems substantially. Encapsulated glass-to-glass PV modules and solar photocatalytic glass surfaces are identified as elements of a green architecture combining renewable power generating and destruction of air pollutants of urban environments. Emerging solar technologies for power generation, including transparent PV modules, solar chimney and thermoelectric systems may become significant areas of future solar glass applications.
Article Outline
1. Introduction
1.1. Solar electricity
1.2. Solar thermal systems
1.3. Solar chemical reactions
2. Glass for photovoltaic cells
2.1. Light trapping and anti-reflecting
2.2. Encapsulation
2.3. Building integrated photovoltaic (BIPV)
3. Glasses for solar thermal collectors
3.1. AR coating and heat insulation
3.2. Environmental compatibility and degradation
4. Glasses for solar chemical reactors
4.1. Photocatalysis
5. Outlook
References


A survey of energy and environmental applications of glass
Journal of the European Ceramic Society, Volume 29, Issue 7, April 2009, Pages 1193-1201
Richard K. Brow, Melodie L. Schmitt
Abstract
Glasses can be engineered with a wide range of properties and in a variety of forms that make them important materials for current and emerging energy and environmental technologies. The increasing worldwide demand for sustainable, environmentally friendly energy supplies, and for access to clean water, will provide glass scientists and manufacturers opportunities to develop new materials for new markets. Glass applications for solar, wind and nuclear power generation are reviewed, and recent research on new glassy materials for super-capacitors and electrochemical devices is discussed, with an emphasis on the needs that will drive glass research through the year 2020.
Article Outline
1. Introduction
2. Energy-related applications
3. Glasses for solar energy
4. Glass for solar-driven water purification
4.1. Photocatalysis using glass substrates
4.2. Solar stills for desalination
5. Glass fibers for wind-energy
6. Glasses for nuclear wastes
7. Glasses for other power sources
8. Glass microspheres for hydrogen storage
9. Summary and outlook
References


Parking the power: Strategies and physical limitations for bulk energy storage in supply–demand matching on a grid whose input power is provided by intermittent sources
Renewable and Sustainable Energy Reviews, Volume 13, Issue 8, October 2009, Pages 1934-1945
William F. Pickard, Amy Q. Shen, Nicholas J. Hansing
Abstract
It is shown that, in a sustainable energy future, energy for the electricity grid will probably be derived largely from the renewable sources of wind and solar radiation. Because both are intermittent, any infinite busbar grid supplying a metropolitan area must necessarily be buffered from these intermittencies by massive energy storage on the gigawatt-day level. It is then demonstrated that, under presently foreseeable scientific capabilities, only underground pumped hydro and advanced adiabatic compressed air energy storage appear capable of meeting anticipated technological and economic constraints. Neither has ever been constructed and tested; but even so it is predicted that underground pumped hydro ultimately will prove to be superior.
Article Outline
Nomenclature
1. Introduction
2. Sources of sustainable energy
2.1. Heat radiation from nuclear fusion reactions
2.1.1. Solar heat radiation: Natural photochemistry (biomass)
2.1.2. Solar heat radiation: Anthropogenic photchemistry
2.1.3. Solar heat radiation: Wind energy
2.1.4. Solar heat radiation: Rain (hydro) energy
2.1.5. Solar heat radiation: Wave energy
2.1.6. Solar heat radiation: Photovoltaic converters
2.1.7. Solar heat radiation: High temperature thermal converters
2.1.8. Solar heat radiation: Low temperature thermal converters.
2.2. Deep terrestrial fission reactions
2.2.1. Deep terrestrial nuclear processes: Geothermal energy
2.3. Human mediated nuclear reactions
2.3.1. Human-mediated nuclear reactions: Controlled fission
2.3.2. Human-mediated nuclear reactions: Controlled fusion
2.4. The need for energy storage
3. Storage of electrical energy in massive quantities
4. Discussion
Appendix. Candidate technologies for grid energy storage
A.1. Preliminaries
A.2. Underground pumped hydro
A.3. Advanced-adiabatic compressed-air energy storage (AA-CAES)
A.4. Batteries
A.5. Fuel cells
A.6. Flywheels
A.7. Superconducting magnetic energy storage (SMES)
A.8. Ultracapacitors
References


2009 Wilfried B. KRAETZIG, Reinhard HARTE, Ulrich MONTAG, Ralf WOERMANN: From large natural draft cooling tower shells to chimneys of solar upwind power plants

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2009 Reinhard HARTE, Wilfried B. KRATZIG, Hans-Jurgen NIEMANN: From Cooling Towers to Chimneys of Solar Upwind Power Plants

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2009 Ahlbrink, Belhomme, Pitz-Paal: Modeling and Simulation of a SCPP

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2009 David McCLAY: Sustainable Energy without the hot air (pages 65-73)

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2009 Deubener : Glasses for solar energy conversion systems

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2009 Edmonds : Hot air balloon engine

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2009 Harte: From Cooling Towers to Chimneys of SUPP

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2009 HE: Analysis of the temperature boundary layer of unsteady natural convection solar chimney

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2009 Klarin: Basic Solar Chimney Flow Improvements (p465-472)

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2009 Koonsrisuk Chitsomboon: Partial geometric similarity for SCPP modeling

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2009 Kraetzig: From large natural draft cooling tower shells

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2009 Larbi: Performance analysis of a SCPP in the south-western region of Algeria

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2009 LI: Research on the Chimney Power Used in the Recuperation of the Power Plant

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2009 Petela: Thermodynamic study of a simplified model of the SCPP

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2009 SHI: Analysis of flow and heat transfer characteristics for system equipped with hot air-flow turbine

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2009 Stamatov: Utilisation of SUPP for electricity generation and improvement of air quality

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2009 Zhou: Analysis of chimney height for SCPP

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2009 Zhou: Novel concept for producing energy integrating a solar collector with a man-made mountain hollow

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2009 Yabuz: The study on the constructional improvements and the research of methods to increase the performance of the solar chimney
(132pages in Turkish)

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2009 LI: New Type of Helical Heat Collecting Solar Chimney Power Generation System

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2009 Ming: Unsteady numerical conjugate simulation of the SCPP generation systems

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2009 Niemann: The SUPP Design and Optimization of the Tower for Wind Effects

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2009 SHI: Solar chimney power generation and its energy loss

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2009 Zhou: Analysis on the thermodynamic performance of the SCPP generation systems

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New type of Greenhouse configuration for SCPP (from LI and MING 2009)
New type of Greenhouse configuration for SCPP (from LI and MING 2009)
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2009
太阳能烟囱发电系统的CFD模拟研究
CFD simulation research on solar chimney power system
【作者】 范振河; 刘发英;
【Author】 FAN Zhen-he 1, LIU Fa-ying 2
(1. Shandong Chemical Engineering College, Zibo 255406, China;
2. Shandong University of Technology, Zibo 255049, China)
【机构】 山东化工职业学院; 山东理工大学;
【摘要】 太阳能烟囱发电技术是一项综合应用温室效应技术、烟囱技术及风力涡轮发电技术于一体的太阳能发电新技术,是实现大规模开发和利用太阳能的一种新途径。采用计算流体动力学(CFD)方法对太阳能烟囱发电系统的速度场、压力场和温度场进行了数值模拟。结果表明:在其它条件不变的情况下,集热棚周边高度对系统的发电功率没有影响;太阳能烟囱直径存在一最佳值,使发电系统输出的发电功率最大。 更多还原
【Abstract】 Solar chimney technology for electricity generation is a new technology for utilizing the greenhouse effect technology, the chimney technology and the turbine technology synthetically. It’s a new way to develop and make use of the solar energy. In this paper, the velocity field, the pressure field and the temperature field in the solar chimney system were simulated. According to the result: when other conditions are changeless, the surrounding height of solar collector has no influence on the power output; there is an optimal value of the solar chimney diameter, by which the power output of the system is the most.
【关键词】 太阳能烟囱; 数值模拟; 计算流体动力学; 影响因素;
【Key words】 solar chimney; numerical simulation; CFD; influence factor;
【文献出处】 可再生能源, Renewable Energy Resources, 编辑部邮箱 , 2009年04期

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2009
太阳能热气流发电系统透平发电及其能量损失
Solar chimney power generation and its energy loss
【作者】 时笑阳; 明廷臻; 许国良; 胡立业; 李钰; 雷俊;
【Author】 SHI Xiao-yang 1, MING Ting-zhen 1, XU Guo-liang 1,HU Li-ye 2, LI Yu 1, LEI Jun 1
(1. School of Energy & Power Engineering, Huazhong University of Science and Technology, Wuhan 430074,China;
2. East China Electric Power Test & Research Institute Co., Ltd., Shanghai 200437, China)
【机构】 华中科技大学能源与动力工程学院; 华东电力试验研究院有限公司;
【摘要】 对包含蓄热层、透平的太阳能热气流发电系统的流动及传热及发电特性进行数值模拟,建立了太阳能热气流发电系统的流动与传热数学模型,分析了太阳辐射和透平压降对系统透平发电输出功率以及系统各部件能量损失的影响。计算结果表明:当太阳辐射为800 W/m2、透平压降为400 Pa时,系统输出功率可达160 kW; 此外,大流量的流体流出烟囱成为造成系统能量损失的主要因素,集热棚顶棚也造成了大量的能量损失。 更多还原
【Abstract】 Numerical simulations of flow, heat transfer, and power generation characteristics of the solar chimney generation system with the energy storage layer and the turbine were carried out, and the mathematical models of flow and heat transfer were built. The effects of solar radiation and pressure drop across the turbine on the output power and energy loss of the solar chimney generation system were analyzed.Numerical simulation results showed that when the solar radiation is 800 W/m2 and the pressure drop in the turbine was 400 Pa, the system output power up to 160 kW. In addition, the large flow of fluid out of the chimney as the main energy loss caused by system factors, shed collector roof also caused a great deal of energy loss....

【关键词】 太阳能热气流发电系统; 集热棚; 蓄热层; 烟囱; 透平;
【Key words】 solar chimney generation system; collector; energy storage layer; chimney; turbine;
【基金】 教育部重点研究基金(104127)
【文献出处】 华东电力, East China Electric Power, 编辑部邮箱 , 2009年04期

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2009

太阳能热气流发电系统的热力性能分析
ANALYSIS ON THE THERMODEYNAMIC PERFORMANCE OF THE SOLAR CHINMEY POWER GENERATION SYSTEMS

【作者】 周洲; 明廷臻; 潘垣; 刘伟; 黄素逸;

【Author】 Zhou Zhou~1,Ming Tingzhen~(1,2),Pan Yuan~2,Liu Wei~1,Huang Suyi~1
(1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
2. College of Electrical and Electronic Engeering, Huazhong University of Science and Technology, Wuhan 430074, China)

【机构】 华中科技大学能源与动力工程学院; 华中科技大学电气与电子工程学院;

【摘要】 对太阳能热气流发电系统的热力学性能进行了分析,建立了系统的热力学循环,进一步分析了系统的实际循环效率和理想循环效率,对不同规模的太阳能热气流发电系统的热力学特性进行了计算比较。结果表明:大规模太阳能热气流发电系统相应的标准布雷顿循环效率、理想循环效率以及实际循环效率分别为:35%,10%~25%和0.9%~2.0%。分析结果为太阳能热气流发电技术的设计与商业应用提供理论参考。 更多还原

【Abstract】 Theoretical analysis is made on the air flow through various parts of a solar chimney power generation system and a thermodynamic cycle starting from the collector inlet, passing through collector and chimney outlet, and finally back to the collector inlet from the environment is established. Later, numerical models for ideal and actual cycle efficiencies are also established. The results showed that: a large-scale solar chimney power system corresponding standard Brayton cycle efficiency, the ideal cycle efficiency and the actual standard Brayton cycle efficiency were: 35%, 10% to 25% and 0.9% to 2.0%. The results for the solar chimney power generation technology is designed to provide a theoretical reference and business applications.

【关键词】 太阳能热气流发电; 集热棚; 烟囱; 布雷顿循环; 热效率;
【Key words】 solar chimney power generation; collector; chimney; Brayton cycle; thermal efficiency;

【基金】 教育部重点基金资助项目(104127)

【文献出处】 太阳能学报, Acta Energiae Solaris Sinica, 编辑部邮箱 , 2009年08期

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2009

太阳能热气流透平发电系统流动与传热特性分析
ANALYSIS OF FLOW AND HEAT TRANSFER CHARACTERS FOR POWER GENERATION SYSTEM EQUIPED WITH HOT-AIR-FLOW TURBINE USING SOLAR ENERGY【作者】 时笑阳; 明廷臻; 刘伟; 周洲;
【Author】 SHI Xiao-yang, MING Ting-zhen, LIU Wei, ZHOU Zhou
College of Energy and Power Engineering, Central China University of Science and Technology, Wuhan 430074, Hubei Province, PRC
【机构】 华中科技大学能源与动力工程学院;
【摘要】 建立了包含蓄热层和透平的太阳能热气流发电系统的流动与传热数学模型,分析了太阳辐射和透平压降对系统透平发电输出功率以及系统各部件能量损失的影响。对MW级太阳能热气流发电系统进行的二维稳态数值模拟计算结果表明:太阳辐射和透平压降对系统输出功率以及系统出口参数的影响均非常显著;当太阳辐射高于400W/m2、透平压降高于300Pa时,系统输出功率可达1MW以上;大流量的流体流出烟囱是造成系统能量损失的主要因素,集热棚顶棚也会引起较高的能量损失。 更多还原
【Abstract】 A mathematical model of flow and heat transfer for power generation system equiped with hot-air-flow turbine using solar energy,including heat energy storage layer and turbine proper, has been established, and the influence of solar radiation and pressure drop across the turbine upon power output from and energy loss in the said power generation system being analysed. The calculation results of 2-D steady state numerical simulation carried out on the MW-class power generation system using solar energy show that the solar rediation and pressure drop across the turbine both have signigicant effects upon the power output and outlet parameters of the said system; when the solar radiation is large than 600 W/m2, and pressure drop across the turbine is higher than 320 Pa, the power output of the system can reach 120 KW and more. The large mass flow rate of air through the chimney may be the main factor of energy loss in the system, while the canopy of heat collector may also result in large energy loss.
【关键词】 太阳能; 热气流发电; 集热棚; 蓄热层; 烟囱; 透平;
【Key words】 solar energy; hot-air-flow power generation; heat collector; heat storage layer; chimney; turbine;
【基金】 教育部重点研究基金(104127)
【文献出处】 热力发电, Thermal Power Generation, 编辑部邮箱 , 2009年06期

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2009
一种新型的太阳能热气流发电系统
New Type of Solar Chimney Power Generation System

【作者】 李卉梓; 陈念桥; 周洲; 李钰; 雷俊; 明廷臻; 许国良; 刘伟;
【Author】 LI Huizi 1 CHEN Nianqiao 2 ZHOU Zhou 3 LI Yu 3 LEI Jun 3 MING Tingzhen 3 XU Guoliang 3 LIU Wei 3
(1. Department of Electricand Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
2. Department of Capital Construction, Huazhong University of Science and Technology, Wuhan 430074, China;
3. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)
【机构】 华中科技大学电子科学与技术系; 华中科技大学基建处; 华中科技大学能源与动力工程学院;
【摘要】 提出了一种螺旋集热型太阳能热气流发电系统,建立了该系统的流动与传热特性数学模型。数值模拟结果表明,与西班牙太阳能热气流试验电站相比,在烟囱出口流动与传热特性参数及输出功率相同情况下,螺旋集热型太阳能热气流的集热棚半径减少了25%,占地面积减少了44%,具有较明显的经济性和商业优势。 更多还原
【Abstract】 A new helical heat-collecting solar chimney power generation system is put forward and mathematical model describing the characteristics of flow and heat transfer is established in this paper. Numerical simulation results show that: compared with the Spanish solar chimney prototype model, with the same chimney outlet parameters of flow and heat transfer characteristics and output power, the collector radius and the corresponding area of the helical heat-collecting solar chimney power generation air collector roof radius decreased by 25%, covering area decreased by 44%, with obvious economic and commercial advantages.

【关键词】 太阳能热气流发电; 螺旋集热; 集热棚; 烟囱; 透平;

【Key words】 solar chimney power plant system; helical heat-collection; collector; chimney; turbine;
【基金】 教育部重点研究基金资助项目(104127)
【文献出处】 水电能源科学, Water Resources and Power, 编辑部邮箱 , 2009年03期

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2009
太阳能烟囱发电技术
Solar Chimney Power Technology
【作者】 张轶群;
【Author】 ZHANG Yi-qun (Daqing Petroleum Institute e-Science Institute, Heilongjiang Daqing 163318, China)
【机构】 大庆石油学院电子科学学院;
【摘要】 叙述了太阳能烟囱发电技术的产生背景,介绍了太阳能烟囱发电技术原理、能量转化过程及效率,指出,太阳能烟囱发电所需投资相对较低,是一项很有发展前景的发电技术。 更多还原
【Abstract】 In the world today, many countries are paying close attention to the subject of Solar Energy. The study of the technology in energy saving is also included in Chinese Energy Policy. Utilization of energy can benefit us very much on energy saving, and also it may play an important part in reducing environment pollution. This article introduces the background of the technology of solar chimney for power generator, the present situation and progress of solar chimney technology in the world, and the theory of the solar chimney. Besides, the article makes the sizing of solar chimney systems and analyzes the primary technology concerned.
【关键词】 太阳能; 烟囱; 集热棚;
【Key words】 solar energy; chimney; collector shelf;
【文献出处】 山西能源与节能, Shanxi Energy and Conservation, 编辑部邮箱 , 2009年04期


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