共查询到20条相似文献，搜索用时 31 毫秒
1.
LI Wei ZHU Xin-jian CAO Guang-yi 《浙江大学学报(A卷英文版)》2007,8(5):734-740
This paper describes a solar photovoltaic fuel cell (PVEC) hybrid generation system consisting of a photovoltaic (PV) generator, a proton exchange membrane fuel cell (PEMFC), an electrolyser, a supercapacitor, a storage gas tank and power conditioning unit (PCU). The load is supplied from the PV generator with a fuel cell working in parallel. Excess PV energy when available is converted to hydrogen using an electrolyser for later use in the fuel cell. The individual mathematical model for each component is presented. Control strategy for the system is described. MATLAB/Simulink is used for the simulation of this highly nonlinear hybrid energy system. The simulation results are shown in the paper. 相似文献
2.
为进一步提高太阳能利用效率和太阳能辅助空气源热泵供热系统的性能,提出了一种新型太阳能空气源热泵供热系统,并研究了该供热系统的性能和特性.基于自行设计的10kW空气源热泵,建立了供热系统的数学模型,通过模拟得出了不同环境温度和出水温度下供热系统的运行特性和性能规律.结果表明：基于新型太阳能辅助空气源热泵供热系统,热泵的性能得到较大的提高.当环境温度为7℃时,空气源热泵的COP最大可增加26%.这为进一步研究新型太阳能辅助空气源热泵供热系统在供暖季节的性能奠定了基础. 相似文献
3.
作者研究发的太阳能-空气双源热泵热水系统,将太阳能热泵与水蓄热结合,根据用户的需要和室外气象条件的变化,具有单独太阳能制热水、单独空气源制热水、制热水兼制冷、单独制冷、供暖等多种功能,可以节约能源,减少环境污染,是绿色建筑值得推广的一项技术。该系统运行稳定,能效比高,不但可以作为一项新技术在实际工程上推广,而且能够进行科研实验,又可供学生进行系统的测试、调试,作为教学仪器使用。 相似文献
4.
Study on performance of a packed bed latent heat thermal energy storage unit integrated with solar water heating system 总被引：1，自引：0，他引：1
NALLUSAMY N. SAMPATH S. VELRAJ R. 《浙江大学学报(A卷英文版)》2006,7(8):1422-1430
INTRODUCTION Efforts of rational and effective energy man-agement, as well as environmental considerations, increase the interest in using renewable energy sources, especially solar energy. Because of discrep-ancy between the energy supply and demand in solar heating applications, a thermal energy storage (TES) device has to be used for the most effective utilization of the energy source. Energy storage combined with solar collectors and photovoltaic systems have been developed over the… 相似文献
5.
A maximum power point tracker for photovoltaic energy systems based on fuzzy neural networks 总被引：1，自引：0，他引：1
Chun-hua Li Xin-jian Zhu Guang-yi Cao Wan-qi Hu Sheng Sui Ming-ruo Hu 《浙江大学学报(A卷英文版)》2009,10(2):263-270
To extract the maximum power from a photovoltaic （PV） energy system, the real-time maximum power point （MPP） of the PV array must be tracked closely. The non-linear and time-variant characteristics of the PV array and the non-linear and non-minimum phase characteristics of a boost converter make it difficult to track the MPP for traditional control strategies. We propose a fuzzy neural network controller （FNNC）, which combines the reasoning capability of fuzzy logical systems and the learning capability of neural networks, to track the MPP. With a derived learning algorithm, the parameters of the FNNC are updated adaptively. A gradient estimator based on a radial basis function neural network is developed to provide the reference information to the FNNC. Simulation results show that the proposed control algorithm provides much better tracking performance compared with the filzzy logic control algorithm. 相似文献
6.
In order to improve the output efficiency of a photovoltaic (PV) energy system, the real-time maximum power point (MPP) of the PV array should be tracked closely. The non-linear and time-variant characteristics of the photovoltaic array and the non-linear and non-minimum phase characteristics of a boost converter make it difficult to track the MPP as in traditional control strategies. A neural fuzzy controller (NFC) in conjunction with the reasoning capability of fuzzy logical systems and the learning capability of neural networks is proposed to track the MPP in this paper. A gradient estimator based on a radial basis function neural network is developed to provide the reference information to the NFC. With a derived learning algorithm, the parameters of the NFC are updated adaptively. Experimental results show that, compared with the fuzzy logic control algorithm, the proposed control algorithm provides much better tracking performance. 相似文献
7.
The charging characteristics of the valve-regulated lead acid (VRLA) battery driven by solar energy were experimentally studied
through the pressure-control method in this paper. The aims of the research were to increase charging efficiency to make the
most of solar energy and to improve charging quality to prolong life of battery. The charging process of a 12 V 12 A·h VRLA
battery has been tested under the mode of a stand-alone photovoltaic (PV) system. Results show that the pressure-control method
can effectively control PV charging of the VRLA battery and make the best of PV cells through the maximum power point tracking
(MPPT). The damage of VRLA battery by excess oxygen accumulation can be avoided through the inner pressure control of VRLA
battery. Parameters such as solar radiation intensity, charging power, inner pressure of the battery, and charging current
and voltage during the charging process were measured and analyzed. 相似文献
8.
根据目前光伏电池领域的知识类别和能源化工专业学生的理论基础条件,确定课程知识框架。通过对教学参考书的整理研究,结合现今太阳能光伏产业的发展和技术革新状况,建构适合能源化工专业学生学习的内容体系,并对具体教学内容进行选编,使学生掌握基本的太阳电池相关知识。 相似文献
9.
文章分析了光伏发电照明系统的太阳能电池组件选择、主要部件的容量计算和安装,以及将LED作为照明灯具等问题,提出了图书馆太阳能光伏发电照明系统的方案设计．以3kW光伏电站为样本,估算投资分布与发电成本,结果显示其成本与同类发电站成本相同,而太阳能光伏系统中最大的成本累积在蓄能环节．同时探讨了太阳能光伏发电系统的效率优化问题并提出了应对策略． 相似文献
10.
Experimental investigation on system with combination of ground-source heat pump and solar collector
This paper presents the heating performance and energy distribution of a system with the combination of ground-source heat pump and solar collector or a solar-assisted ground-source heat pump system (SAGSHPS) by calculation and experiment.The results show that the average absolute error is less than 0.6 ℃ and the relative error is less than 5% under the pulse load when the analytical solution to the 2-D solid cylindrical source model is used for the SAGSHPS.The coefficient of performance (COP) of the SAGSHPS is 2.95-4.70.The average fluid temperature in the borehole heat exchanger can increase by 3 ℃ with the assistance of solar collector,which will improve the COP of the heat pump by approximately 10% from the experimental data.The energy contributions to the total heating load of soil,electricity and solar are 56.30%,36.87% and 6.83%,respectively. 相似文献
11.
通过对空气源热泵热水器的性能进行实验研究,考察了空气的相对湿度对其性能的影响。实验结果表明：空气的相对湿度对蒸发压力、COP和吸气温度等性能有一定的影响;相对湿度的增大会导致蒸发器表面冷凝水增多,有效润湿面积增大,空气侧与制冷剂侧换热系数增加,最终导致蒸发器潜热换热量增加,从而强化了传热。 相似文献
12.
太阳能供热采暖系统是指将太阳能转换成热能,供给建筑物冬季采暖和全年其他用热的系统。本研究提出了太阳能-空气源复合热源热泵系统,采用辅助加热炉为辅助热源和采用辅助热泵为辅助热源,系统由集热模块、控制模块、采暖模块组成,采用防过热选择性吸收涂层的集热器和防过热旁路散热器,解决了系统过热问题;同时对空气源热泵、辅助加热设备与太阳能集热器结合系统的运行性能进行了研究,优化了系统运行控制策略。 相似文献
13.
为了更好的普及太阳能综合利用技术,丰富教学、实训资源,深圳职业技术学院结合本院多年的教学经验,自主开发研制了一套太阳能综合利用教学、实训装置。为了更好的说明该套装置的功能和特点,将以系统总述、硬件构成、上位机系统、数据采集及通信系统、太阳能光伏发电及实训项目、太阳能＆空气双源热泵热水系统等6篇文章详细介绍相关的内容。本文为系列文章（Ⅰ）——系统总述,从整体上对该套装置进行了描述,并重点阐述了该套装置的设计思路及其功能特点,对类似教学设备的开发有一定的指导意义。 相似文献
14.
A mathematical optimization model was set up for a ground-solar combined system based on in-situ experimental results,in which the solar collector was combined serially with a ground-coupled heat pump(GCHP).The universal optimal equations were solved by the constrained variable metric method considering both the performance and economics.Then the model was applied to a specific case concerning an actual solar assisted GCHP system for space heating.The results indicated a system coefficient of performance(COP)of 3.9 for the optimal method under the seriaI heating mode,and 3.2 for the conventional one.In addition,the optimum solution also showed advantages in energy and cost saving.1eading to a 16.7%improvement in the heat pump performance at 17.2%less energy consumption and 11.8%lower annual cost,respectively. 相似文献
15.
韩群勇 《Journal of Zhangzhou Technical Institute》2012,14(2):17-19,36
研究太阳能光伏系统向一个边远山区畜禽养殖场供电,设计了一种可门动控制的光伏发电系统,能充分利用太阳能这…取之不尽的清洁能源,义不会对环境造成污染,具有应用前景。 相似文献
16.
杨红 《青海师范大学学报(哲学社会科学版)》2014,(4):11-14
当前,中国正在由世界第一光伏生产大国走向光伏应用大国。加快太阳能光伏产业的发展与推广应用是青海应对能源发展新形势的必然选择。本文通过介绍青海光伏产业发展现状,阐述了太阳能光伏产业发展中“青海现象”产生的必然性,进而分析了青海光伏产业发展中存在的问题,并结合光伏产业发展趋势,提出了发展青海光伏产业的相关建议和思考。 相似文献
17.
分析了换热器对集热器效率的影响,确定了换热器对集热器的削弱因子;提出了二次换热平板型太阳热水系统的能量方程。对自然循环二次换热平板型太阳热水系统系统的热性能进行了测试与分析,测试表明,自然循环二次换热平板型太阳热水器的平均日效率低于普通平板型太阳热水器,但高于真空管太阳热水器。 相似文献
18.
目前,世界正在面临寻找替代能源以减少对常规能源的依赖,太阳能便是一个很好的解决方案。但是太阳能辐射强度和环境温度对太阳能电池技术参数和输出特性有很大影响,这里采用了太阳能电池的实用化的工程数学模型,在Matlab/Simulink的仿真系统中,建立了太阳能电池阵列的仿真模型,便于运用到太阳能的开发研究工作中。 相似文献
19.
Sheela K. Ramasesha 《Resonance》2013,18(5):440-457
The global warming issues were discussed in Part 1 of this series of articles. This part describes the different solar energy technologies that are available for generating electricity to meet our daily power requirement. The article focuses on different kinds of materials that can be used to make the photovoltaic cells. The most common photovoltaic cells are made with monocrystalline or polycrystalline silicon. The next generation photovoltaic cells are thin film based. The high efficiency multijunction and concentrated solar cell technologies are also introduced in this article. The concept of power generation using solar thermal energy is explained. In the Indian scenario, there are about 250–300 sunny days in most parts of the country. A brief summary of the solar sector achievements in the country is given. 相似文献
20.
黎艺华 《柳州职业技术学院学报》2012,12(3):48-51
利用丰富的太阳能资源来解决边远无电地区用电问题是非常有效的途径之一。介绍了针对边远无电地区农牧民、海上岛屿、船舶、河流船只、山区林场等家庭及单位的太阳能户用电源系统设计方法和应用实例。 相似文献