太阳能-地热联合闪蒸发电方法探讨

传统的太阳能和地热能的利用,都是局限在单独的太阳能和地热能利用系统,这样就使这些新能源在利用过程中受它们本身所具有的季节性、随机性、间歇性特点的限制,不能很好地提供连续稳定的电力能源。文章介绍一种全新的太阳能-地热联合闪蒸发电系统。该系统具有发电效率高,可连续稳定运行,清洁无污染的特点。     

浅层地热能+太阳能联合系统在冀南地区新农居中的应用

以河北省冀南地区某新农村住宅为研究对象，分析太阳能资源和浅层地热能资源的分布规律和特征，提出2种运行模式，进行了全年运行数据监测，从技术性和经济性等角度对联合系统和单一系统的运行效果进行综合对比分析。结果表明：联合系统的综合性能优于单一地源热泵系统，在冀南地区采用联合系统更高效节能。     

基于氢氧联合循环的分布式能源系统设计

风能、太阳能等新能源发电迅速发展,新能源发电系统联网对于缓解传统电网供电压力,改善能源结构具有重要作用.这些能源表现出波动性和间歇性,给电网运行带来前所未有挑战.通过分析以清洁能源发电为主的分布式电源大量联网的局限性,结合微网技术,提出了在氢氧联合循环发电系统基础上的分布式能源系统,系统采用联合最优功率控制模式,与清洁...     

运行调节方式对斯特林发电装置性能的影响分析

碟式斯特林发电系统是一种新型的具有广阔应用前景的新能源动力系统,其性能研究和开发利用受到世界许多国家的重视。本文以等温模型为基础,考虑各部件中工质流动损失、热损失,对20 k W级碟式太阳能聚光器双作用斯特林发电系统在两种不同运行调节方式下的性能进行模拟计算。结果显示:无论从发电量、发电功率、发电效率大小及波动性,还是运行调节参数的波动性、控制性等方面考虑,压力调节运行方式均优于温度调节运行方式。     

加快发展河北省太阳能光热发电的建议和对策

太阳能作为一种可再生的新能源,越来越引起人们的关注。我国每年太阳能资源理论储量折合标准煤达17000亿t,而包括风能、水能、生物质能、地热能在内的其它所有可再生能源折合标准煤不到60亿t,太阳能利用潜力巨大。太阳能发电主要有光伏发电和光热发电。太阳能光热发电比光伏发电具有更多的优势。阐述了太阳能光热发电的国内外发展现状,分析了河北省太阳能的资源潜力,并提出了河北省发展太阳能光热发电的建议和对策.     

太阳能与浅层地热能联合供暖运行模式分析

文章通过太阳能与浅层地热能联合供暖的必要性,介绍了一种太阳能与浅层地热能联合供暖系统,探讨了联合供暖的运行模式,并对其经济性进行了分析,为综合利用太阳能和浅层地热能提供参考。     

新型复合式太阳能热电系统稳态特性分析

以太阳能为主的新能源利用技术近年来得到迅速发展。介绍了一种采用环形热管降低光伏电池片温度的新型复合式太阳能热电系统,提高了太阳能系统的综合利用率。分析了系统的基本原理和主要构成,同时搭建室内太阳能光热光电实验平台,进行太阳能热电系统稳态特性的测试研究,对太阳辐射强度、空气温度、空气流速及热泵蒸发温度等影响因素进行分析和探讨。该系统对太阳能在建筑中的综合利用有实际应用价值。     

可再生能源联合发电技术

近年来,随着国家倡导低碳经济,以风电、水电、太阳能、生物质能为代表的新能源得到了快速的发展。风能、水能、太阳能、生物质能等多种可再生能源联合发电是一种有效的可再生能源利用方式。简述了风能、水能,太阳能和生物质能的发电原理,并探讨了目前国内关于多种能源联合互补发电系统的设计研究成果。     

太阳能热风发电技术及其应用

在太阳能热气流发电的基础上增设进风口,形成了利用太阳能和风能的太阳能热风发电系统。建立了太阳能热风发电热动力稳态数学模型,通过此模型可判断出发电系统的稳定性,并可解出热风风速、集热棚出口温度及稳态数学模型的其它参数。文章介绍了太阳能热风发电系统的实际运行情况,运行结果与数学模型计算结果相吻合。理论分析和运行实践表明,提高塔筒高度、加大塔筒内外温差、增加集热棚的太阳能吸收率、增大集热棚面积系数及风力发电机组的风能利用率,是提高太阳能热风发电量的途径。     

再压缩sCO2 CPG联合循环热力优化

将CO_2地质封存与地热能开采相结合,利用CO_2羽流地热(CPG)系统开采超临界CO_2(sCO_2),并通过再压缩sCO_2布雷顿循环进行发电。建立了以太阳能为辅助热源的再压缩sCO_2布雷顿循环-CPG联合发电系统模型,研究了两类参数对联合发电系统性能的影响,并根据遗传算法进行全局参数优化以获得最大系统效率及最小度电耗sCO_2量。结果表明:再压缩sCO_2布雷顿循环-CPG联合发电系统具有较高的热效率,其中,主压缩机入口压力与分流比是影响系统热力学性能的主要参数,通过设计参数优化,系统效率可高达18.47%,度电耗sCO_2量减小至60.31 kg/(kW·h)。     

Turkey's Renewable Energy Facilities in the Near Future

In this work, renewable energy facilities of Turkey were investigated. Electricity is mainly produced by thermal power plants, consuming coal, lignite, natural gas, fuel oil and geothermal energy, and hydro power plants in Turkey. Turkey has no large oil and gas reserves. The main indigenous energy resources are lignite, hydro and biomass. Turkey has to adopt new, long-term energy strategies to reduce the share of fossil fuels in primary energy consumption. For these reasons, the development and use of renewable energy sources and technologies are increasingly becoming vital for sustainable economic development of Turkey. The most significant developments in renewable production are observed hydropower and geothermal energy production. Renewable electricity facilities mainly include electricity from biomass, hydropower, geothermal, and wind and solar energy sources. Biomass cogeneration is a promising method for production bioelectricity.     

低温热能发电的研究现状和发展趋势

低温热能种类繁多,数量巨大,利用这部分能源意义重大。介绍了低温热能发电技术的研究现状和发展趋势。低温热能发电技术主要应用于太阳能热电、工业余热发电、地热发电、生物质能发电、海洋温差发电等方面。现阶段低温热能发电的研究重点有:工质的热物性和环保性能、循环优化研究;提高低温热能发电效率的研究,包括混合工质循环、Kalina循环、回热、氨吸收式动力制冷循环等;基于有限时间热力学的系统最优控制等方面的研究。     

Advancement in solar photovoltaic/thermal (PV/T) hybrid collector technology

This article presents an overview on the research and development and application aspects for the hybrid photovoltaic/thermal (PV/T) collector systems. A major research and development work on the photovoltaic/thermal (PVT) hybrid technology has been done since last 30 years. Different types of solar thermal collector and new materials for PV cells have been developed for efficient solar energy utilization. The solar energy conversion into electricity and heat with a single device (called hybrid photovoltaic thermal (PV/T) collector) is a good advancement for future energy demand. This review presents the trend of research and development of technological advancement in photovoltaic thermal (PV/T) solar collectors and its useful applications like as solar heating, water desalination, solar greenhouse, solar still, photovoltaic-thermal solar heat pump/air-conditioning system, building integrated photovoltaic/thermal (BIPVT) and solar power co-generation.     

Geothermal energy utilization trends from a technological paradigm perspective

The use of geothermal energy and its associated technologies has been increasing worldwide. However, there has been little paradigmatic research conducted in this area. This paper proposes a systematic methodology to research the development trends for the sustainable development of geothermal energy. A novel data analysis system was created to research the geothermal energy utilization trends, and a technological paradigm theory was adopted to explain the technological changes. A diffusion velocity model was used to simulate and forecast the geothermal power generation development in the diffusion phase. Simulation results showed that the development of installed capacity for geothermal generation had a strong inertia force along with the S-curve. Power generation from geothermal power sources reached a peak in 2008 and is estimated to be saturated by 2030. Geothermal energy technologies in hybrid power systems based on other renewable energy sources look to be more promising in the future.     

Performance analysis of a hybrid solar-hydrogen-retired EV batteries (REVB) energy system with thermal-electrical loops

Utilizing solar energy is an efficient method to provide hybrid renewable energy system with sufficient thermal/electrical energy. Meanwhile, the rapid development of electrical vehicles leads to an excess of retired electric vehicles. As a combination of the abovementioned two conceptions, this study proposed and examined a hybrid solar-hydrogen-retired electrical vehicle battery energy system to meet thermal and electrical loads for small-scale usage. The novelty of this research is delivered as follows: first of all, the proposed hybrid energy system supplies both thermal and electrical energy to small-scale end users; secondly, the retired electrical vehicle batteries are recycling to relieve the pressure of battery demand; thirdly, an energy management strategy to regulate the complicated hybrid energy system is designed. The results show that with assistance of fuel cell as an energy storage unit, solar energy can basically satisfy the annual thermal/electrical load with maximum monthly energy supplement of 1220.43 MJ and 1572.75 kWh, respectively. However, the solar radiation serving as single energy source is not very reliable for large-scale utilization. Although the state of charge does not fluctuate greatly, the small range charge/discharge between 59% and 63% can still guarantee the normal operation of the proposed hybrid energy system.     

Use of solar assisted geothermal heat pump and small wind turbine systems for heating agricultural and residential buildings

The main objective of the present study is twofold: (i) to analyze thermal loads of the geothermally and passively heated solar greenhouses; and (ii) to investigate wind energy utilization in greenhouse heating which is modeled as a hybrid solar assisted geothermal heat pump and a small wind turbine system which is separately installed in the Solar Energy Institute of Ege University, Izmir, Turkey. The study shows 3.13% of the total yearly electricity energy consumption of the modeled system (3568 kWh) or 12.53% of the total yearly electricity energy consumptions of secondary water pumping, brine pumping, and fan coil (892 kWh) can be met by using small wind turbine system (SWTS) theoretically. According to this result, modeled passive solar pre heating technique and combined with geothermal heat pump system (GHPS) and SWTS can be economically preferable to the conventional space heating/cooling systems used in agricultural and residential building heating applications if these buildings are installed in a region, which has a good wind resource.     

Numerical simulation of geothermal-PVT hybrid system with PCM storage tank

As the increase in greenhouse emissions, climate changes, and other irreversible repercussions stems from environmentally destructive energies such as fossil fuels, exploiting solar and geothermal energy as unlimited clean sources of energy in the renewable energy technologies can survive the planet earth, which is facing a catastrophe on a global scale. The main purpose of this research is to study Techno analysis of the combined ground source heat pump (GSHP) and photovoltaic thermal collectors (PVTs) with a “phase-change material” (PCM) storage tank to fulfill the energy demands of a residential building. In the first step of this study, in order to model the heat pump behavior in multi-usage operation modes (heating and cooling), a numerical transient simulation of a water-to-water GSHP, which includes a vertical U-type ground source heat exchanger (GSHX) and a variable speed drive (VSD) compressor, was conducted by developing a numerical code in Engineering Equation Solver software. To study the thermodynamic aspect of the hybrid system in terms of exergy and energy, a transient numerical simulation was accomplished using the TRNSYS program. Also, the impact of effective characteristics of ingredients such as areas of PVT panels and the volume of the storage tank of PCMs on the performance of the hybrid system are investigated. On top of that, the two types of the GSHP-PVT-PCMs and GSHP-PV from the energy and exergy points of view are compared. The obtained results demonstrate that the irreversibility of the solar modules of the GSHP-PVT-PCMs is 6.6% lower than that of the GSHP-PV. Furthermore, the calculation of the annual required load of the building for these two kinds of hybrid systems shows that the use of collectors in this combined system has reduced the total load of the building by 6.5%. The use of collectors in the GSHP-PVT-PCM gives rise to a difference in the value of solar factor (SF) of this system by 1.4% more than the one for the hybrid system without thermal collectors.     

An innovative compressed air energy storage (CAES) using hydrogen energy integrated with geothermal and solar energy technologies: A comprehensive techno-economic analysis - different climate areas- using artificial intelligent (AI)

The present study evaluates the optimal design of a renewable system based on solar and geothermal energy for power generation and cooling based on a solar cycle with thermal energy storage and an electrolyzer to produce hydrogen fuel for the combustion chamber. The subsystems include solar collectors, gas turbines, an electrolyzer, an absorption chiller, and compressed air energy storage. The solar collector surface area, geothermal source temperature, steam turbine input pressure, and evaporator input temperature were found to be major determinants. The economic analysis of the system showed that the solar subsystem, steam Rankine cycle, and compressed air energy storage accounted for the largest portions of the cost rate. The exergy analysis of the system demonstrated that the solar subsystem and SRC had the highest contributions to total exergy destruction. A comparative case study was conducted on Isfahan, Bandar Abbas, Mashhad, Semnan, and Zanjan in Iran to evaluate the performance of the proposed system at different ambient temperatures and irradiance levels during the year. To optimize the system and find the optimal objective functions, the NSGA-II algorithm was employed. The contradictory objective functions of the system included exergy efficiency maximization and cost rate minimization. The optimal Exergy round trip efficiency and cost rate were found to be 29.25% and 714.25 ($/h), respectively.     

太阳能与燃煤机组混合发电方式的热经济性研究

阐述了分别从锅炉蒸发受热面、高压加热器汽侧和汽轮机低压缸引入太阳热能与燃煤机组进行混合发电的3种集成方案,定义了太阳能热电转换率、单位时间节煤量及太阳能热贡献率等评价指标,并以某300 MW燃煤机组为例,应用变热量等效焓降法计算理论对3种太阳能与燃煤机组混合发电集成方案的热经济性指标进行了计算和比较,确定了混合发电的最优集成方式,并对其经济性进行了初步分析.结果表明：混合发电集成方案2-1（取代2号高压加热器抽汽）的热经济性指标、运行安全性和稳定性均较好,因此选取方案2-1作为混合发电最优集成方案;太阳能的单位发电成本为0.63元/（kW·h）,低于单纯太阳能发电站的0.75～1.85元/（kW·h）.