光导照明在厂房中的应用

光导照明设备主要由采光装置、导光装置、漫射装置三部分组成。导光装置是一种远程传光系统，而且可以用来传输大的光通量，导光管内表面涂以金属反射层，用以产生境面反射，入射光线经过管道不断地被反射，直到很远。     

自然采光无电照明--东方风光绿色建筑节能技术开启零碳未来

正导光管采光系统整合太阳能光热技术、太阳能光电技术、室内环境控制调节技术,将太阳光导入室内需要光线的任何地方并提供室内照明,无需常规能源,做到了真正的绿色照明。导光管采光又称光导照明、日光照明、自然光照明、管道式采光、阳光导入照明和无电照明等,是一项对太阳能新利用的高效清洁的节     

基于Soltrace的聚光碟面反射目标靶设计方法

以Soltrace为基础,利用该软件的三坐标系统对碟式聚光单元进行建模,结合其光线追踪技术,给出可用于指导镜面精确安装调节以实现太阳光高效均匀汇聚的调光目标靶的设计方法。理论分析表明该方法能够有效地结合碟式聚光系统及其接收器的机械结构,在保证汇聚光完全通过热接收器入口的前提下,在发动机热头处获得能量集中且均匀分布的光斑。以此目标靶为基础的碟式聚光系统的安装调节结果表明该方法的正确性和有效性。     

二次反射多碟太阳能聚光器设计与性能分析

设计一种小规模的光线向下式焦点固定的多碟聚光集热系统,其特点是焦点固定,光线向下汇聚,吸热器开口向上,并提出该系统的追踪方式。通过对一次镜场和二次反射镜的分析和优化设计,使设计工况下吸热器入口的平均能流密度达到420 kW/m²,光学效率为87.4%,可为实现光线向下式焦点固定聚光系统的发展和优化提供技术方案。     

聚光太阳灶设计参数的选取

旋转抛物面具有良好的聚光特性,目前绝大多数聚光太阳灶的反射面均系抛物面,因此抛物面的设计是制作聚光太阳灶时首先要考虑的问题。一、采光面积的确定太阳灶的采光面积是指灶在正常使用时反射曲面在垂直于入射光线平面上的投影面积。一个实用的太阳灶必须具有一定的功率,因此,也就需要有适当的采光面积。采光面积的大小可用下式估     

平板集热器的最佳倾角

我们知道,到达集热器透明盖板采光面上的太阳辐射量,与太阳光线和集热器表面的法线之间的夹角(入射角)有关,它可用下式表示 H_b=H_ncosθ_T (1)式中,H_b为到达集热器采光面上的太阳直接辐射量,H_n为垂直于太阳光线平面上的直接辐射量,θ_T为入射角。上式表明,太阳光线的入射角越小,到达采光面的太阳能量越大,θ_T=0°时达最大。因此,对于固定安装的集热器,为了获得最大的太阳辐射量,就必须使采光面在正午辐射最强时,与太阳光线垂直(如图1所示)。这时有下述关系:     

用于玻璃幕墙的透射式太阳能聚光系统研究

提出一种用于玻璃幕墙的新型透射式聚光系统,利用光学软件模拟不同入射角下系统的聚光特性,分析微小聚光单元壁厚变化对聚光系统性能的影响,并与实体结构及梯形结构的聚光系统进行对比。仿真结果表明,该系统在入射角较小时接收率较高,入射角较大时透射率较高;且与其他结构相比该特点更加明显。根据仿真结果加工实验样件,选择一典型晴朗天气进行测试,实验结果与仿真结果具有很好的一致性,该系统在正午出现透射率最低值28.2%,而在09:40之前及15:40之后,透射率都能超过55%。结果表明,基于新型透射式聚光系统的玻璃幕墙系统可很好地实现控光功能,并能将能量进一步利用,应用前景广阔。     

用于土地灌溉的半掩埋管式聚光太阳能蒸馏器的实验研究

提出一种用于直接为植物根系供水的聚光式太阳能蒸馏管设计思想,对装置结构和运行原理进行介绍,对用于该蒸馏管的聚光面进行聚光性能仿真,证明其具有宽广的聚光角,当光线入射角等于30°时接收率仍然达到近65％.并在实际天气条件下对蒸馏管的产水性能和运行温度进行了实验测试,给出了装置内部的工作温度和产水性能随时间的变化曲线.实验...     

东方风光公司

<正>创立于2005年的东方风光公司(简称"公司"),是一家直接利用太阳能和风能从事导光管采光技术和自然通风技术研发与应用的专业公司,是国内首家开发和生产以"尚拓SUNTUBE"为品牌的导光管采光系统和自然通风系统的高新技术企业。2013年"公司"在深圳建成以导光管采光和自然通风技术为主导的建筑节能示范工厂,成立国内第一家导光管采光技术和自然通风技术的研发机构,目前已形成集产品研发、生产制造、工程设计、销售安装于一体的专业化公司。本着"让人类回归大自然"的理念,东方风光公司整合太阳能光热技术、太阳能光电技术、室     

基于复合抛物面的新型三维光伏聚光器

为提高太阳能电池的输出功率,设计了一种基于复合抛物面的矩形出口三维聚光器。运用光迹追踪软件,对传统二维槽式聚光器及新型三维聚光器的工作性能进行了比较。仿真显示,当光线的入射角在聚光器接收范围内时,新型三维聚光器具有大于90%的聚光效率和较高的聚光比。将接收半角为35°的三维聚光器应用于多晶硅太阳能电池上,在太阳辐照度为400 W/m2的情况下,电池最大输出功率可达到非聚光的2.25倍。     

Theoretical solution for light transmission of a bended hollow light guide

Hollow light guides with very high reflective inner surfaces are novel daylight systems that collect sunlight and skylight available on the roof of buildings transporting it into deep or windowless interiors in building cores. Thus the better utilization of daylight can result in energy savings and wellbeing in these enclosed indoor spaces. An analytical complex solution of a straight tube system was solved in the HOLIGILM method with a user-friendly tool available on the http://www.holigilm.info. An even more difficult light flow transport is to be determined in bended tubes usually placed on sloped roofs where a bend is necessary to adjust the vertical pass through the ceilings.This paper presents the theoretical derivation of the model with its graphical representation and coordinate system respecting backward ray-tracing bend distortions. To imagine the resulting illuminance on the horizontal plane element in the interior, the virtual ray (i.e. luminance in an elementary solid angle) has to pass the ceiling diffuser interface, the inner mirror like tube with a bend, through a roof cupola attachment to the element of the sky and sun light source. Due to this complexity and the lengthy derivation and explanations more practical applications will be published later in a separate contribution.     

Transmission of mirror light pipes with triangular, rectangular, rhombic and hexagonal cross section

This paper derives expressions for the transmission of mirror light pipes (MLP) with cross sections exhibiting congruent symmetry. These include rectangular, triangular, rhombic and hexagonal cross sections. For the case of rectangular MLP the transmissions calculated by this method are the same as the transmissions calculated by integrated ray trace methods. Measurements of the transmission of rectangular and triangular MLP were made and compared with calculated transmissions. It is shown that calculated transmissions are consistent with measured transmissions provided a reflectance that varies with incidence angle on the aperture of the MLP is used. A simple expression for this variation was found from the experimental measurements.     

Splayed mirror light pipes

An expression is given for the transmission of the rectangular-section mirror light pipe. The expression is used to model throughputs for simulated solar conditions over a calender year. It is found that the splaying of a mirror light pipe results in a significant increase in throughputs particularly in winter months.     

光导管冬季采光性能的实验研究

为了优化其采光性能,并为照明工程提供设计依据,对某一光导管进行了在冬季3种典型天气情况下的测量.通过本试验工作,得到了冬季各种典型天气情况下光导管的光通量、室内照度分布值,证明了光导管对散射光的采集作用.     

Theoretical analysis of error transfer from surface slope to refractive ray and their application to the solar concentrated collector

This paper discusses the error transfer from the slope of optical surface to the focus ray. It presents a general equation to calculate the standard deviation of the refractive ray error from that of slope error of the optical surface through geometric optics analysis, applying the equation to calculate the standard deviation of the focus ray error in 6 kinds of solar concentrator, and providing typical results. The results indicate that the slope errors in two directions are transferred to any one direction of the focus ray when the incidence angle is more than 0; for a point focus Fresnel lens, a point focus parabolic glass mirror, and a line focus parabolic glass mirror, the error transferring coefficient from the optical surface to the focus ray will increase when the rim angle or distance of reflection or refraction point to the axis increases; for a TIR-R concentrator, it will decrease; for a glass heliostat, it relates to the incidence angle and azimuth of the reflecting point. The results show that the slope error of the optical surface may be enlarged more than ten folds to the focus ray to decrease the optical efficiency of the solar concentrator greatly.     

Sunlight concentrator design using a revised genetic algorithm

Solar light is a source of green energy that poses no harm to the environment. The layout of a sunlight concentrator has a significant effect on prism-based sunlight concentration systems. This study develops a genetic algorithm that improves the layout efficiency and symmetry of sunlight concentration, by considering light reflection and refraction given the assumption of vertical incident light angle and known transmission rate. Results obtained from the experiments, which involved different settings, show that compared with the current design, more than 400% improvement in brightness and 80% in symmetry can be achieved by the proposed approach. In addition, sensitivity analyses are conducted to simulate different practical scenarios, including different incident light angles.     

基于槽式聚光的光热反应与集热协同实验研究

设计一种全光谱太阳能分级分质利用系统进行光热协同反应与集热一体化实验研究。该系统通过光热协同催化材料将太阳光中紫外及部分可见波段光的能量转化为化学能进行储存,并利用系统中的集热材料将太阳光中部分可见及红外波段的光能转化为热能进行储存,从而实现对全光谱太阳能的综合利用。实验以光热协同分解水制氢为目标反应,利用导热油进行集热。结果表明,在反应材料表面温度为414 ℃的条件下,氢气产量为15.65 μmol/g,系统集热效率可达43.61%。     

A new design of nontracking seasonally adjusted plane mirror linear trough solar concentrator with a flat horizontal absorber

This paper presents an optical design based on a single-reflection criterion, and performance characteristics of an east-west aligned nontracking seasonally adjusted linear trough solar concentrator with a flat horizontal absorber, using plane mirror elements. The design procedure allows the use of any desired number of mirror elements to reflect solar energy onto the base absorber in one reflection. The angle of inclination of each mirror element with respect to the absorber surface, and the width of the mirror element, are determined so that a ray incident on the extreme upper edge of the mirror element at a specified angle to the normal to the concentrator aperture (acceptance half-angle), after reflection, strikes the extreme edge of the absorber on the opposite side of the mirror element. Other rays making angles less than the design acceptance half-angle are also reflected onto the base absorber in one reflection. Concentrator designs resulting from this approach appear to have the important characteristic of relatively smaller heights, and hence appear highly cost-effective in terms of the amount of material required for fabrication. Some numerical calculations have been carried out to illustrate the performance of concentrators for different acceptance half-angles. Results obtained are presented in graphic and tabular forms, and are discussed.     

基于镜面积尘的线性菲涅尔系统聚光性能研究

针对线性菲涅尔反射式（LFR）聚光集热系统镜面积尘所引起的光学损失问题,建立镜面积尘的系统三维模型,利用蒙特卡洛光线追迹法进行光学仿真模拟,研究灰尘颗粒形状、粒径以及镜面积尘密度对光线路径、系统能流密度和聚光效率的影响,并利用LFR能流密度测试系统来验证仿真模拟方法的可靠性。结果表明,球体颗粒对光线有汇聚作用,入射至正方体颗粒的光线会被完全吸收,镜面积尘密度增加1 g/m²,吸热管周的平均能流密度降低625.17 W/m²,系统的聚光效率下降5.53%,且镜面积尘颗粒的粒径越小,吸热管周的能流密度下降越严重,不同积尘密度下仿真模拟与试验测试的能流密度变化趋势一致,两者之间误差为9.6%。