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气泡作为浮法玻璃熔制过程中不可避免的缺陷之一,极大程度影响着玻璃的质量等级和加工性能。该文对浮法玻璃熔制过程中气泡的来源、长大过程以及澄清机理进行了系统的研究和探讨。 相似文献
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利用质谱仪、光学显微镜等分析方法研究分析了浮法玻璃熔制过程中各类气泡产生原因、特征,并提出了控制气泡产生的方法。 相似文献
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通过对浮法玻璃生产过程中几种典型气泡缺陷产生原因的分析 ,总结出由缺陷的直观现象判断缺陷成因的思路和方法。 相似文献
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防火玻璃框架系统是主要由防火玻璃、钢制耐火框架和防火密封材料组成,在一定时间内满足耐火稳定性和(或)隔热性要求的非承重系统,主要包括防火玻璃门、防火玻璃隔墙、防火玻璃窗和防火玻璃幕墙.目前国内尚无完整的针对该体系的国家级规范.结合欧洲相关规定和技术论述防火玻璃框架系统的设计和应用. 相似文献
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点支承玻璃幕墙结构多采用四点支承玻璃板,当玻璃板的跨度过大时,可采用六点支承板,而现有的《玻璃幕墙工程技术规范》(JGJ102-2003)及《点支式玻璃幕墙工程技术规程》(CECS 127:2001)并未给出六点支承玻璃板应力及挠度的设计计算公式。本文主要通过有限元方法对六点支承玻璃板的抗弯性能进行分析,考虑面外均布荷载、玻璃板的厚度及平面尺寸的变化对六点支承玻璃板应力及挠度的影响,得到玻璃板的应力及挠度随上述各参数变化的规律;并比较了六点支承玻璃板和四点支承玻璃板的计算结果,提出了六点支承玻璃板的设计建议。 相似文献
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二氧化钒镀膜玻璃(下称VO2玻璃)是一种有前景的热致变色玻璃,具有相变机能,可以通过自身光学透过率的变化,调节进入建筑室内的太阳光,达到节能的目的。根据国家对建筑玻璃的测量标准,测量了VO2玻璃的可见光透射率、太阳光直接透射率、相变温度、发射率、可见光反射率等参数,计算出了VO2玻璃的遮阳系数Sc值。通过建立传热模型,模拟计算出了传热系数K值。最后将所有关于VO2玻璃的参数汇总并与目前常用节能玻璃进行性能的比较和分析,得出VO2玻璃优于部分目前常用节能玻璃,略弱于Low-E玻璃。VO2玻璃优势在其相变机能和对光污染的控制,缺点是采光性能一般,隔热性能不足,相变前后的透射率变化范围窄。对其性能不足的改进是未来的发展方向。 相似文献
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《Energy and Buildings》2005,37(7):725-738
This article is about a study on glass window and glass window with film of different types in aspect of thermal comfort and heat transmission. Different types of glass window, clear glass, tinted glass, reflective glass, double pane glass, and low-e glass were investigated. Films with different spectral optical properties were then adhered to the glass windows of different types and studied. The analysis was done based on the outside design weather condition which selected from 12 years of Bangkok meteorological data. Predicted percentage of dissatisfied (PPD) was selected as the thermal comfort index. The relative heat gain (RHG) based on local weather condition was selected as the heat transmission index. The PPD can be subdivided into the PPD due to surface temperature effect and the PPD due to solar radiation effect. The analysis indicated that, for most of the glass windows considered except the reflective glasses, the values of PPD due to solar radiation effect were much larger than the values of PPD due to surface temperature effect. And the most discomfort condition occurred when using a clear glass as window. Adhered films to the glass windows caused the PPD due to surface temperature effect increase and cause the PPD due to solar radiation effect decrease. It was also found that the PPD values due to solar radiation effect for glass windows and glass windows with films were varied linearly with the total transmittance of glass windows and glass windows with films. The PPD values due to surface temperature effect were varied with the total absorptance of glass windows and glass windows with films in an almost linear fashion. The heat transmission index, RHG, based on chosen design weather condition can be subdivided into the RHG due to conduction effect and RHG due to solar radiation effect. The analysis indicated that the values of RHG due to solar radiation effect were larger than the values of RHG due to conduction effect for all glass windows and glass windows with films considered in this study. Adhered film to the glass windows resulted in lowering the relative heat gain due to solar radiation in the amount corresponding to the film properties. But the film had very few effect on the relative heat gain due to conduction. The relative heat gain values were varied linearly with the total transmittances of the glass windows and glass windows with films. The relative heat gain values were also varied inversely with the absorptances of glass windows and glass windows with films in a linear fashion. 相似文献
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Tests to determine the characteristics of broken laminated safety glass and a calculation of the remaining structural capacity of a glass arch. The aim of this work is to show, in an exemplary way, using a glass arch with tension rod possibilities to calculate the remaining structural capacity of broken laminated glass. To achieve this aim tensile and bending tests on PVB‐foil and broken laminated safety glass were carried out at 10 °C. Furthermore experiments to determine the friction between broken laminated glass and steel and neoprene were performed. 相似文献
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立式平板玻璃堆垛机将玻璃片以立式一次性堆入玻璃集装架,能完成各种规格玻璃的堆垛,目前在平板玻璃生产线上应用广泛,但由于设备本身机构较为复杂,控制要求高,国内很少有厂家研发成功。本文着重分析设备本身的连杆机构在立式平板玻璃堆垛机中的应用分析。 相似文献