The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Lu Zuo - One of the best experts on this subject based on the ideXlab platform.

  • experimental research on Solar Chimneys integrated with seawater desalination under practical weather condition
    Desalination, 2012
    Co-Authors: Lu Zuo, Yue Yuan, Yuan Zheng
    Abstract:

    Abstract A small-scale experimental device for Solar Chimneys integrated with sea water desalination (abbreviated in integrated system) has been set up. Its performance has been studied based on the practical weather condition. The experimental results show that the integrated system can achieve simultaneously the multi-targeted production indeed, such as power and freshwater. The main period of the distilled water output is during the absence of Solar irradiance, but the minimum output is during the period of the strong radiance. The airflow temperature rises along the radial of the system and the temperature rise mainly occurs in the first 1/3 section of the heat collector radius. The variation trend of theoretical generated power against time is in accordance with that of air temperature at the chimney entrance. Compared to the solo Solar chimney power generation system, the integrated system would significantly improve the utilization efficiency of the Solar energy.

  • numerical analysis of flow heat transfer characteristics in Solar Chimneys integrated with seawater desalination
    International Conference on Sustainable Power Generation and Supply, 2012
    Co-Authors: Lu Zuo, Yue Yuan, Wenming Liu
    Abstract:

    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. (7 pages)

  • the influence of chiimney structural parameters on the Solar Chimneys integrated with seawater desalination
    International Conference on Sustainable Power Generation and Supply, 2012
    Co-Authors: Lu Zuo, Yuan Zheng, Yujun Sha
    Abstract:

    Comparison experimental devices with the different chimney structural parameters for the Solar chimney power generation system integrated with seawater desalination have been set up. The performances of these integrated devices have been tested and researched comparatively under the actual weather condition. Results show the seawater regeneration body in the system has certain load range to the flow rate of airflow. It is beneficial to strengthen the seawater evaporation, enhance the freshwater output that the diameter of the chimney is enlarged and the height is enhanced in this range. To the electricity power generation of the system, whether to increase the chimney diameter, or increase the chimney height, the volume of the chimney will be increased when other parameters are fixed, namely the flow rate of airflow will be increased, and the power generation will be significantly increased, thus the Solar energy utilization efficiency will significantly improve. In the actual project, it is very important that the optimal combination of different height and diameter of the chimney can be selected according to the actual situation for development of large-scale integrated system. (5 pages)

  • the influence of heat collector structural parameters on the Solar Chimneys integrated with seawater desalination
    International Conference on Sustainable Power Generation and Supply, 2012
    Co-Authors: Lu Zuo, Yue Yuan, Wenming Liu
    Abstract:

    An unsteady-state mathematical model of the heat transfer and flow of the integrated system under no-load condition has been developed. The influence of heat collector structural parameters on the system has been researched. The results show that the negative pressure, draft force, velocity and airflow temperature rise of integrated system increase significantly with the increasing of collector diameter. The collector diameter has no influence to the seawater temperature, glass cover temperature and hourly freshwater yield per unit area basically. With the increasing of collector inlet height, the negative pressure, velocity and temperature rise decrease, the seawater temperature and the glass cover temperature also decrease. The amplitude value of the glass cover temperature drop is bigger than that of the water temperature drop. The hourly freshwater yield increases in certain time periods and decreases in other time periods. The influence of collector inlet height on the characteristics of integrated system has a tendency to weaken with the increasing of collector inlet height. (7 pages)

  • Solar Chimneys integrated with sea water desalination
    Desalination, 2011
    Co-Authors: Lu Zuo, Yuan Zheng, Yujun Sha
    Abstract:

    Abstract A new Solar chimney power system with integration of sea water desalination has been introduced for the production of electricity and fresh water in this paper. Two mathematical models have been developed individually for a one-dimensional flow in solo Solar chimney power system and this system. Through theoretical analysis, it has been demonstrated the integrated system can significantly improve the Solar energy utilization efficiency as well as the land resources utilization efficiency, at the same time, the economic, social and ecological benefits can also be significant. The integrated system suits to be developed in Northwest China very much.

Roozbeh Sangi - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation of Solar chimney power plants in iran
    Renewable & Sustainable Energy Reviews, 2012
    Co-Authors: Roozbeh Sangi
    Abstract:

    Abstract The Solar chimney power plant is a simple Solar thermal power plant that is capable of converting Solar energy into thermal energy in the Solar collector. In the second stage, the generated thermal energy is converted into kinetic energy in the chimney and ultimately into electric energy using a combination of a wind turbine and a generator. The purpose of this study is to evaluate the performance of Solar chimney power plants in some parts of Iran theoretically and to estimate the quantity of the produced electric energy. A mathematical model based on the energy balance was developed to estimate the power output of Solar Chimneys as well as to examine the effect of various ambient conditions and structural dimensions on the power generation. The Solar chimney power plant with 350 m chimney height and 1000 m collector diameter is capable of producing monthly average 1–2 MW electric power over a year.

Abtin Ataei - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of a combined Solar chimney for desalination and power generation
    Energy Conversion and Management, 2017
    Co-Authors: Mohammad Asayesh, Alibakhsh Kasaeian, Abtin Ataei
    Abstract:

    Abstract Large footprint and very low efficiency are main disadvantages of Solar Chimneys. To resolve this, Solar desalination system has been added under the collector of a Solar chimney power plant. Generally the collector ground is completely covered by the desalination pond but here it is shown that more benefit can be achieved by partial occupation of the collector area. This is performed by implementing the particle swarm optimization (PSO) algorithm in conjunction with a one dimensional simulation code. The code is first validated using data of a laboratory scale Solar chimney. Then, optimization results show that for a collector diameter of 250 m and tower height of 200 m, a Solar pond located between radii 85 and 125 m of the collector can maximize the outcome of the combined system. Generally, dimensions of the desalination system depend on local cost of building the system and price of electricity and fresh water produced.

Alex Stojcevski - One of the best experts on this subject based on the ideXlab platform.

  • Solar chimney power plant and its correlation with ambient wind effect
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Mazdak Arzpeyma, Kazi Md. Salim Newaz, Mehdi Seyedmahmoudian, Naveed Akram, Ben Horan, Saad Mekhilef, Alex Stojcevski
    Abstract:

    The use of Solar energy in the present era is necessary and important as well. Solar chimney technology for power generation is one of the Solar energy harvesting techniques where the direct and dispersed Solar radiations are absorbed in the Solar chimney power plant. The effectiveness of Solar Chimneys has been proven for power generation, and it is a promising approach to future energy generation plans. This article provides a comprehensive scenario of the research and development of Solar energy technology as well as the history of Solar Chimneys in the last few decades. It describes the state of empirical and theoretical studies and the physical processes for this commonly used technology. Finally, this paper presents some avenues to cover the practical required approaches for Solar chimney power generation plant. In this study, the numerical investigation is also considered to study the stack configuration effect on the performance of a Solar chimney power plant. Numerical simulation of the proposed configuration shows that the speculated geometry can reduce the throttling effect of the deflected plume.

Lawrence L. Kazmerski - One of the best experts on this subject based on the ideXlab platform.

  • An overview of the use of Solar Chimneys for desalination
    Solar Energy, 2019
    Co-Authors: Cristiana Brasil Maia, Felipe Venancio Mitkiewicz Silva, Vinicius Cunha Oliveira, Lawrence L. Kazmerski
    Abstract:

    Abstract The increased world-demand for water and energy and rapidly growing investments in clean-energy sources have led to serious consideration for the use of renewable sources of energy to desalinate seawater or brackish water. There are several technologies used currently, and Solar energy has been shown to be a viable source for these important applications. But among the various Solar energy approaches (photovoltaics, Solar thermal), innovation is still required to improve performance and achieve economic viability. Solar Chimneys are devices that use Solar energy to generate a hot airflow that can drive wind turbines and produce electric power. One of the main disadvantages of Solar Chimneys is their very low efficiency. The overall performance can be improved significantly by combining water desalination and power generation in one system. There are still only a few studies reporting the use of Solar Chimneys for desalination, but these results are promising. Most of the studies available in the literature focus on numerical simulations, evaluating several possibilities to increase the overall performance and the utilization efficiency of Solar energy. No single hybrid chimney-desalination configuration has yet shown itself to be the obvious choice, and further studies are required. This paper discusses and reviews the main technologies used for Solar desalination and evaluates the most relevant approaches for the use of Solar Chimneys for such water treatment.