Low-E中空玻璃最佳气体间隔层厚度的研究

在综合文献资料的基础上,给出了Low-E中空玻璃系统U值和Sc值的计算公式。根据U值计算结果,研究了玻璃厚度、配置情况,3#面玻璃辐射率,填充气体种类和环境条件等对最佳气体间隔层厚度的影响。研究结果对于Low-E中空玻璃设计、生产和应用有一定指导和参考价值。     

影响建筑玻璃组件节能效果的因素

通过对试验数据的分析,说明玻璃厚度、玻璃间隔层的厚度、玻璃的辐射率、玻璃组件空腔内的气体种类等对玻璃组件的热传导系数、太阳热获得系数、遮蔽系数、相对热增的影响。     

Low—E玻璃对建筑节能的贡献

在《玻璃》2011年第7期《低辐射玻璃的概念与应用问题的讨论》的基础上,进一步讨论了Low-E玻璃的辐射系数对Low-E中空玻璃、Low-E充气中空玻璃和Low-E真空玻璃的隔热保温性能的影响,给出了有关计算结果,说明了Low-E中空玻璃的中间层厚度不应小于6mm。采用辐射系数E=0.25、中间层6mm的Low-E玻璃,可以满足北京地区建筑节能65%的要求。充填氩气等低导热气体取代空气,中空玻璃的保温性能有所提高。Low-E玻璃的辐射系数对Low-E真空玻璃传热系数的影响更大,真空玻璃虽然厚度比中空玻璃小很多,但传热系数更小,建筑节能效果更好。     

浅淡被动式门窗中空玻璃U值

简要介绍了国内外被动式建筑节能标准要求,并对中空玻璃传热系数U值几个容易混淆的相关概念加以理解,同时给出传热系数测试方法、测试标准及其运用计算软件的点评,通过运用中空玻璃稳定状态下传热系数U值的计算公式及取值,计算出各种配置中空玻璃的U值,重点论述中空玻璃配置、中空腔气体组成、气体层厚度和玻璃厚度对中空玻璃稳态U值的影响,并分别给出了满足欧洲标准和河北标准对被动式门窗用中空玻璃U_g值的要求的各种配置下的中空玻璃气体层厚度和玻璃厚度范围和较为经济的范围。     

类金刚石薄膜对Low-E膜系的保护作用分析

采用射频等离子体增强化学气相沉积法(RF-PECVD),在Low-E玻璃表面沉积类金刚石(DLC)薄膜作为保护层,通过耐洗刷试验和耐酸腐蚀试验研究了DLC薄膜对Low-E膜系的保护作用;同时对镀DLC薄膜的Low-E玻璃进行热处理,研究热处理后Low-E玻璃膜层结构、低辐射性能和光学性能的变化;然后通过摩擦磨损实验对镀DLC膜提高Low-E玻璃耐洗刷的原因进行分析。结果表明:DLC膜能够有效提高Low-E玻璃耐洗刷性和耐酸腐蚀性;并且DLC膜可以通过热处理去除,且热处理后的Low-E低辐射性能和光学性能未受到影响;一定厚度DLC膜能够有效降低Low-E玻璃摩擦系数,是提高Low-E玻璃耐磨性的主要原因。     

Low-E玻璃的性能分析及在节能建筑中的应用

Low-E玻璃全称为低辐射镀膜玻璃(low emissivity coated glass),因所镀膜层具有极低的表面辐射率而得名.对Low-E玻璃的主要性能、建筑节能及其在节能建筑中的应用进行了分析,可根据我国不同气候区选用高透型或者遮阳型低辐射玻璃.     

超厚SGP夹层Low-E玻璃生产工艺探究

Low-E与SGP夹层的结合使用提高了建筑玻璃的安全性、舒适性,可以满足对玻璃要求更厚、更大、更安全的多元化设计要求,但超厚SGP夹层Low-E玻璃采用传统的加工方式存在效率低、成品率低的缺点。通过探究超厚SGP夹层LowE玻璃的生产工艺,研究了加热方式及SGP类型对10/10及以上厚度SGP夹层Low-E玻璃的影响,并通过实验证明了产品的安全性能。     

钢化应力与硫化镍结石对钢化玻璃自爆率的影响

通过设定不同钢化应力、硫化镍粒径及距中心面位置、玻璃厚度,计算出不同条件下钢化玻璃内部应力,得到了残余应力分布曲线及自爆临界曲线,并结合80例钢化玻璃自爆源样品测试,讨论了降低自爆率的途径.结果表明:玻璃厚度不变时,随着表面压应力值的增大,自爆临界曲线的截止粒径逐渐变小,截止位置也趋近中心面;表面压应力不变时,截止粒径及截止位置不受玻璃厚度影响;若排除临界尺寸0.046 mm以上的结石,自爆率可由现在的0.3％降低至0.003％.     

硬质保护层Low-E镀膜玻璃的工艺技术研究

Low-E镀膜玻璃广泛应用于建筑领域,其对降低建筑能耗、节约能源起着显著的作用。通过对硬质保护层Low-E镀膜玻璃的技术开发及工艺研究,在Low-E镀膜工艺中成功新增了金属锆靶,并对设备工艺进行了改造,制备了硬质保护层Low-E镀膜玻璃。该产品具有良好的耐氧化、耐腐蚀和可加工性,有效解决了镀膜玻璃中空加工时除膜导致的效率低、废品率高的难题。     

低辐射玻璃的概念与应用问题的讨论

针对我国玻璃科技期刊、书籍上出现的对Low-E玻璃的定义、节能机理和Low-E玻璃的应用等一些缺乏科学分析的论述,作者从Low-E的英文原意、玻璃对红外线的吸收作用、建筑玻璃的传热机理和Low-E玻璃的节能作用等多个方面,讨论了Low-E玻璃的概念、节能机理,说明了Low-E玻璃的正确应用方式。     

3D heat transfer modeling and parametric study of a human body wearing thermal protective clothing exposed to flash fire

Understanding the heat transfer mechanism through a clothed man system in extreme environments is of great significance for human thermal protection. Three‐dimensional heat transfer models were developed based on the computational fluid dynamics considering a real‐shape human body in this study. The influences of air gap width, clothing thickness, and emissivity on the heat transfer within a dressed manikin exposed to flash fire were investigated. Simulated results indicated that the heat transfer in the air space was more complicated on the garment level than the fabric, because of the varying relative positions between different body segments and the heat source, as well as the ventilation openings. Increasing the fabric thickness was an effective method to reduce the transferred energy, which could remarkably lower the skin temperature. Decreasing both of the surface and backside emissivity from 0.9 to 0.3 could increase the protective performance, where surface emissivity reduction was recommended since the decrease of clothing temperature could minimize the risks of fabric degradation. The purpose of assuming the uniform air gap was to perform the parametric study, which was unrealistic indeed. The model with real clothing shape will be developed and investigated in the near future.     

最大效率发挥Low-E玻璃的节能作用——剖析Low-E玻璃应用中的一些谬误

就我国Low-E玻璃技术发展与优劣进行了比对,对Low-E玻璃在应用中出现的一些谬误引用热辐射基本原理进行了剖析、阐述,提出了如何更好地正确选用Low-E中空玻璃,充分发挥其优良隔热性能的思路。     

The Emissivity of Transparent Materials

The emission of thermal radiation by transparent materials is reviewed from first principles and is compared with the more familiar emission of radiation by opaque surfaces. The comparison leads to an expression for volume emissive power, which is an important concept for discussions of radiative effects in glass. The present treatment differs from that of McMahon in that it takes account of the diffuse character of radiation. As a result, it also constitutes a simple proof of the often overlooked fact that the radiant flux within a transparent radiator exceeds that emitted into air by a factor approximately equal to the square of the refractive index. Using these concepts, the spectral emissivities of isothermal transparent sheets are expressed in terms of their thickness and the optical properties of their materials. The results are illustrated by a discussion of the total hemispherical emissivities of sheets of window glass at various temperatures. The commonly accepted value of about 0.91 is the same for all glasses having a refractive index of 1.5. However, it applies only for sheets above a certain minimum thickness. For window glass this ranges from 3/16 in. at 200°C. to as much as 8 in. at 1000°C. At 1000°C. a sheet 3/16 in. thick has an emissivity of only 0.59. The application of results to calculations of the radiative cooling of transparent sheets is briefly indicated.     

低辐射建筑节能玻璃研究进展

低辐射玻璃由于其较低的红外辐射率而具有优异的节能效果,被誉为21世纪的节能环保玻璃。主要阐述了低辐射节能玻璃开发意义、节能原理、分类及相应的生产工艺。结合国内外研究现状,对不同低辐射玻璃的节能效果与特性进行对比,提出今后低辐射玻璃的发展应用方向。     

超白在线Low-E玻璃

建筑节能已日益成为国家重点关注的领域,中航三鑫股份有限公司海南中航特玻基地通过引进美国PPG公司在线CVD镀膜技术,成功研制开发出超白在线Low-E玻璃,其产品指标达到国际先进水平。该产品具有可见光高透过、膜层牢固、辐射率底、可二次加工、不易自爆等特点,可广泛应用于建筑节能门窗及大面积幕墙工程。     

浮法在线Low—E玻璃镀膜区的设计及改造

简要介绍了浮法在线低辐射镀膜玻璃（Low—E玻璃）的性能、生产工艺特点,以及在线Low—E玻璃镀膜工艺对镀膜区的工艺要求,论述了满足浮法在线Low—E玻璃工艺要求的镀膜区-锡槽尾端和退火窑AO区的设计和改造方法。     

科学地宣传和使用Low-E玻璃

目前,对Low-E玻璃的宣传存在一些误区。比如片面强调Low-E膜的高红外反射作用,认为使用单片Low-E玻璃就能够使室内夏天凉爽,冬季温暖,达到较好的节能效果。对于由Low-E玻璃制作的中空玻璃或真空玻璃,认为其节能效果是镀膜玻璃双面高红外反射的结果。本文将从Low-E玻璃的红外反射特性、传热系数及遮阳系数方面分析其节能原理,说明Low-E玻璃在中空玻璃、真空玻璃等节能玻璃中的重要作用。     

钢化加热炉内气体流场的模拟研究

着重研究了Low-E玻璃在钢化加热炉内加入空气进行对流传热时,气流的气动特性及速度场分布情况,从而讨论了它对炉内传热所做的贡献.