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Experimental investigation of cold draft induced by two different types of glazing panels in metal curtain walls

机译：两种不同类型玻璃幕墙在金属幕墙中诱发冷风的实验研究

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Metal curtain walls typically have a large portion of continuous glazing area. In cold climate, the cold draft induced by the large cold glazing surface may cause discomfort to occupants seated in the perimeter zone. This paper presents the experimental investigation of the characteristics of the cold draft induced by two different types of glazing panels and its effect on the occupant's local thermal sensation. A large-scale (3.8 m x 6.7 m) metal curtain wall specimen consisting of two different wall systems was tested in an Environmental Chamber. The effect of the thermal performance of glazing units, the frame projection, and the mechanical ventilator on the cold draft was studied. The measurements indicate that the better-insulated glazing unit reduces the cold draft considerably compared to the conventional glazing unit, thus increasing the comfort level of the occupants. The frame projection deflects the cold flow from the wall surface and causes mixing of the cold air with the room air thus elevating the temperature and decreasing the momentum of the cold air before it penetrates into the occupied zone. The mechanical ventilator, located at the end of the room side, simulates the design of moving the heating supply away from the exterior wall. The measurements show that the resultant air movement from the ventilator increases the draft risks at ankle level for the occupants, and the ASHRAE requirements cannot be met until the occupants seat 2 m away from the wall. The analysis shows that, for the test conditions of this study, the glazing surface temperature of both wall systems needs to be raised, through perimeter heating or ventilation system for example, in order to provide a comfortable indoor climate, the need for the better-insulated system being less than the conventional system.
机译：金属幕墙通常具有很大的连续玻璃面积。在寒冷的气候中，较大的冷玻璃表面引起的冷风可能会使坐在周边区域的乘客感到不适。本文介绍了两种不同类型的玻璃板引起的冷风特性及其对乘员局部热感的影响的实验研究。在环境室内对由两种不同墙体系统组成的大型（3.8 m x 6.7 m）金属幕墙样品进行了测试。研究了玻璃窗组件的热性能，框架凸起和机械通风机对冷风的影响。测量结果表明，与常规玻璃窗相比，隔热效果更好的玻璃窗显着降低了冷风，从而提高了乘员的舒适度。框架突出物使冷气流从壁表面偏转，并导致冷空气与室内空气混合，从而升高温度并降低冷空气在进入占用区域之前的动量。位于房间一侧末端的机械通风机模拟了将供热源从外墙移开的设计。测量结果表明，呼吸机产生的空气流动会增加乘员脚踝处的吃水风险，并且在乘员离墙2 m处就座之前无法满足ASHRAE的要求。分析表明，就本研究的测试条件而言，两个墙壁系统的玻璃表面温度都需要提高，例如通过周边加热或通风系统，以便提供舒适的室内气候，因此需要更好的-绝缘系统比常规系统少。

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