共查询到19条相似文献,搜索用时 203 毫秒
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文章提出了一种利用海洋温差能和风能联合发电的方法及装置。利用海洋表层的热海水加热低沸点工质,使之蒸发.送入汽轮机推动汽轮发电机组做功发电,汽轮机排出的工质乏气用海洋深层的冷海水冷凝为液态,再用热海水加热,送入汽轮机,使之蒸发,推动汽轮机发电机组做功发电,如此循环,持续发电;并且利用洋面风力发电,并用该电力驱动热泵装置.由热泵装置的媒质将工质的温度进一步提高.增大工质体积膨胀率;由热泵装置的媒质将冷海水的温度进一步降低.再用该低温海水去冷凝工质乏气,增强对工质乏汽的冷凝效果。该装置既需要用到小型透平,又需要用到风力发电装置.十分适合公司发展。 相似文献
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辽阔的海洋犹如一个巨大的“储热库”,大量地吸收着太阳能,所得到的能量达60万亿千瓦左右。我国海域可利用的海水温差能达1.2亿千瓦。由于太阳辐射无法透射到海水深层,海水温度随着海洋深度的增加而降低。海洋表层海水与深500米处海水,其温度相差可达20℃以上。海洋上下水层 相似文献
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海洋温差能储量巨大,全球总量约400亿kW,我国温差能资源十分丰富,达3.67亿kW。海洋温差能清洁可再生、发电波动小、能量密度高,积极开发海洋温差能资源对实现科技兴海战略具有重要意义。高效热交换技术是海洋温差发电的核心技术。由于海洋温差发电过程中海水和工质流量大、换热器介质进出口温差小,开展高效热交换技术适应性分析十分必要。从高效热交换技术出发,对其换热形式进行综述,阐述并分析其在海洋温差能开发利用中的适应性,并对其发展方向进行展望,为海洋温差能发电工程示范和应用提出指导性建议。 相似文献
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风光互补发电系统是城市利用可再生能源最成熟、最广泛的一种方式。虽然郑州市是太阳能和风能资源都不丰富地区,但根据郑州市风能和太阳能资源特点,通过对风能和光伏发电系统进行经济技术分析后发现,风光互补发电在郑州市仍是有利用价值的。 相似文献
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An overview of ocean renewable energy resources in Korea 总被引:2,自引:0,他引:2
Gunwoo KimMyung Eun Lee Kwang Soo LeeJin-Soon Park Weon Mu JeongSok Kuh Kang Jae-Gwi SohHanna Kim 《Renewable & Sustainable Energy Reviews》2012,16(4):2278-2288
Korea relies on imported fossil fuels to meet its energy consumption demands. As such, there is a need to investigate alternative energy resources such as renewable energy. In this paper, assessments of the potential of various ocean renewable energy resources in the sea around Korea; potential sources of energy including wave energy, tidal energy, tidal current energy and ocean thermal energy. Tidal energy and tidal current energy are likely to play an important role in meeting the future energy needs of Korea, whereas the potentials of wave energy and ocean thermal energy for the same are relatively low. The level of technical development and the renewable energy market in Korea is currently in an early stage. The government will have to be more aggressive in the promotion of renewable energy to achieve sustainable development in Korea. 相似文献
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Ocean water covers a vast portion of the Earth's surface and is also the world's largest solar energy collector. It plays an important role in maintaining the global energy balance as well as in preventing the Earth's surface from continually heating up because of solar radiation. The ocean also plays an important role in driving the atmospheric processes. The heat exchange processes across the ocean surface are represented in an ocean thermal energy budget, which is important because the ocean stores and releases thermal energy. The solar energy absorbed by the ocean heats up the surface water, despite the loss of heat energy from the surface due to back‐radiation, evaporation, conduction, and convection, and the seasonal change in the surface water temperature is less in the tropics. The cold water from the higher latitudes is carried by ocean currents along the ocean bottom from the poles towards the equator, displacing the lower‐density water above and creating a thermal structure with a large reservoir of warm water at the ocean surface and a large reservoir of cold water at the bottom, with a temperature difference of 22°C to 25°C between them. The available thermal energy, which is the almost constant temperature water at the beginning and end of the thermocline, in some areas of the oceans, is suitable to drive ocean thermal energy conversion (OTEC) plants. These plants are basically heat engines that use the temperature difference between the surface and deep ocean water to drive turbines to generate electricity. A detailed heat energy budget of the ocean is presented in the paper taking into consideration all the major heat inputs and outputs. The basic OTEC systems are also presented and analyzed in this paper. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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A study of organic working fluids on system efficiency of an ORC using low-grade energy sources 总被引:1,自引:0,他引:1
Rankine cycles using organic fluids (as categorized into three groups: wet, dry, and isentropic fluids) as working fluids in converting low-grade energy are investigated in this study. The main purpose is to identify suitable working fluids which may yield high system efficiencies in an organic Rankine cycle (ORC) system. Efficiencies of ORC systems are calculated based on an assumption that the inlet condition of the working fluid entering turbine is in saturated vapor phase. Parameters under investigation are turbine inlet temperature, turbine inlet pressure, condenser exit temperature, turbine exit quality, overall irrversibility, and system efficiency. The low-grade energy source can be obtained from a solar pond or/and an ocean thermal energy conversion (OTEC) system. Results indicate that wet fluids with very steep saturated vapor curves in T-s diagram have a better overall performance in energy conversion efficiencies than that of dry fluids. It can also be shown that all the working fluids have a similar behavior of the efficiency-condenser exit temperature relationship. Furthermore, an appropriate combination of solar energy and an ORC system with a higher turbine inlet temperature and a lower condenser temperature (as operated deeply under sea level) would provide an economically feasible and environment-friendly renewable energy conversion system. 相似文献
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基于海洋油气开采设施的海洋新能源一体化开发技术 总被引:1,自引:0,他引:1
提出了海洋传统油气和海洋新能源一体化开发构想,依托于海洋油气生产设施在进行传统油气开采的同时,对天然气水合物进行全面的开发利用;同时依托于海洋油气设施,充分利用波浪能、潮汐能、洋流及海洋温差能等海洋能进行发电。该一体化开发还能够实现二氧化碳温室气体以水合物的形式在大洋深处进行封存,降低全球温室效应,这将大大拓宽海洋石油工业的发展领域,实现对可再生能源的充分利用,保证了未来能源的可持续发展。 相似文献
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为了提高能源利用率,实现节能减排,以总能系统概念为基础,采用燃气和太阳能为能源,水蒸气与有机工质为工作介质,建立燃气分布式供能系统的热力模型和能效模型,对其热经济性和有机工质进行了计算与筛选。以国内某机场分布式能源站机组为例,基于太阳能的能源补充作用以及有机工质气化潜热小的特性,建立燃气分布式能源光热补偿供能系统,经热经济性计算与分析,结果表明:在100%、75%、50%制冷(制热)工况时、新模型在维持原机组总热耗的情况下,机组冷源损失减少,热经济性提高;经过对3种有机工质的筛选,R245FA是较适合于新模型的有机工质。 相似文献
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Reunion Island is heavily dependent on fossil fuels, but seeks to become energy self‐sufficient by 2025. ocean thermal energy conversion provides a means of producing electricity that harnesses the available energy of the ocean by using the temperature gradient between its deep and its upper layers. This paper presents the projected experimental facility which is to be installed at the University of St. Pierre on Reunion Island. A dynamic model of the installation has been developed (on a Delphi interface) by using the concept of equivalent Gibbs systems. In such equivalent system, mass, energy, and entropy are linked through the Gibbs equation, and the entropy production can easily be expressed in terms of fluxes and their related forces. Assuming linear phenomenological laws, the phenomenological coefficients are assessed from technical data. Using a digital tool (Genopt), an optimization study has been conducted in order to determine the best operating parameters according to the temperature of the sea water. This model allows us to anticipate the potential of this technology on Reunion Island. Once validated on the facility, the model will serve as a tool to assist design of the future 10 MW pilot plant planned for 2014. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献