建筑节能已经成为全球建筑界共同关注的焦点问题。建筑幕墙是现代建筑中采用较多的围护结构形式，它将建筑的使用功能与装饰效果巧妙地融为了一体。然而大面积建筑玻璃幕墙的使用却又带来了建筑高能耗以及热工性能差等问题。因此，研究建筑幕墙的节能效果具有非常重要的意义。 本文以点支承结构建筑幕墙的组成及形式为对象，并结合现场调研及郑州周边地区24栋建筑幕墙的现状，对其所使用的材料、支承方式、建筑应用形式进行归纳总结，以及幕墙中所使用的遮阳设施进行了归纳分析研究。得出中空玻璃在建筑幕墙中应用最为广泛，明框建筑幕墙的应用正在逐渐减少，点支承建筑幕墙正在逐渐增多。为了对不同幕墙所选用材料的热工性能指标进行研究，对其进行了传热系数的计算，得出玻璃的传热系数与玻璃的厚度有直接的关系，厚度越大，传热系数越小。且随着玻璃厚度的增加，其传热系数减少的速率逐渐降低。针对点支承建筑幕墙在传导、辐射、对流等方面的能耗影响，提出了降低点支承玻璃幕墙建筑能耗的技术措施。并结合点支承建筑幕墙在工程实例中的应用，提出了玻璃贴膜、更换Low-E中空玻璃、增加遮阳设施三种节能改进方案。 为了进一步验证建筑节能改进方案的适用性，本文以一个点支承玻璃幕墙工程为例，利用清华大学研发的DesT能耗模拟软件，分别对提出的三种节能改进方案进行能耗模拟并对比分析。研究表明，三种节能改进方案对点支承建筑幕墙的节能效果均有提高，而更换Low-E中空玻璃改进方案的节能效果最佳，更适宜在实际工程中广泛应用。因此，对点支承结构建筑幕墙的节能性研究将会对今后解决建筑幕墙热工性能差及建筑能耗高具有很重要的意义。

Building energy efficiency has become an issue of widely concern of the world's construction industry. Glass curtain wall is one of the most common envelope structures, which combines the using function and decorative function skillfully.However, large glass curtain walls may also brought the problem of high energy consumption. Therefore, the study of glass curtain wall has an important significance for the work of energy saving. Based on the analysis of the composition, structural forms and energy-saving measures of glass curtain walls, combine with the research information of 24 glass curtain wall buildings of Zhengzhou and the surrounding areas,the paper analyse the materials of the glass, supporting method,forms of the application and shading devices. According to the regulation of "civil thermal design",a comparative analysis of the common glasses’ heat transfer coefficient is done. For research different structures of glass curtain wall, respectively, exposed frame glass curtain wall, hidden frame glass curtain wall, point supported glass curtain wall appeared in energy efficiency analysis of the problem. Then analyse the influence factors of point supported glass curtain wall’s energy consumption, propose measures of decreasing the energy consumption. The analysis results of the whole system of the point supported glass curtain wall shows that the design work should focus on the heat transfer coefficient and shading coefficient of glass. Finally, proposed improvement projects of adding filmed glass, changing Low-E insulating glass and fixing shading facilities. To verify the applicability of the improvement projects, this paper, based on a practical engineering project, adopt DesT energy simulation software which is developed by Tsinghua University to simulate the energy consumption of the proposed projects. The results shows that Foil improvement program to replace the Low-E insulating glass improvement program, shade improvement program could increase the point supported glass curtain wall of energy efficiency, energy saving and the replacement of Low-E insulating glass improvement program is the most prominent, more suitable for the actual project widely used. The study can contribute to the application of energy saving measures and has some promotional value.