THE INFLUENCE OF HEAT-CONDUCTIVE INCLUSIONS ON THE ENERGY EFFICIENCY OF THE EXTERNAL WALLS OF A DWELLING BUILDING WITH A MONOLITHIC FRAME

Yiriy Bodnar, Maksym Bosetskyi
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Abstract

The influence of "cold bridges" on the reduced heat transfer resistance of wall enclosures, which characterizes their thermal insulation properties and energy efficiency, was studied. A nine-story monolithic frame residential building in the city of Lviv was considered. Wall enclosing structures 250 mm thick made of hollow ceramic blocks on a cement-sand mortar. The thermal insulation of the walls is made by the wet method with plates made of mineral wool 100 mm thick. Windows and transparent facade systems made of PVC profiles filled with double-glazed windows. The following heat-conducting inclusions were considered: mineral wool fastening dowels, window slopes, inter-floor and balcony ceilings, columns, corner joints. To determine the reduced heat transfer resistance, modeling of wall nodes was performed using the finite element method using the Agros2D software complex. As a result of the calculations, the temperature fields and heat flows for the corresponding nodes with "cold bridges" were obtained. Based on calculations of two-dimensional temperature fields of wall fragments, linear heat transfer coefficients for linear heat-conducting inclusions were calculated. The reduced heat transfer resistance for the external walls of the building in question was determined, taking into account the named "cold bridges". The results indicate a significant influence of these heat-conducting inclusions. The influence of each heat-conducting inclusion on the heat transfer coefficient was evaluated. It is concluded that heat transfer inclusions such as ceilings have the greatest impact on heat transfer for the house under study. The results of the research will be useful in the analysis of energy efficiency and the design of multi-story residential buildings with a monolithic frame.
导热夹杂物对整体框架住宅建筑外墙能效的影响
研究了 "冷桥 "对墙体围护结构热传导阻力降低的影响,墙体围护结构的热传导阻力是其隔热性能和能源效率的特征。研究对象是利沃夫市的一栋九层整体框架住宅楼。围墙结构厚 250 毫米,由水泥砂浆上的空心陶瓷砌块制成。墙体的隔热层采用湿法,用 100 毫米厚的矿棉板制成。窗户和透明外墙系统由装有双层玻璃窗的 PVC 型材制成。考虑了以下导热夹杂物:矿棉紧固镙钉、窗户斜面、地板间和阳台天花板、柱子、角接缝。为了确定减小的传热阻力,使用 Agros2D 综合软件,采用有限元法对墙体节点进行了建模。通过计算,获得了带有 "冷桥 "的相应节点的温度场和热流。根据对壁碎片二维温度场的计算,计算出了线性导热夹杂物的线性传热系数。考虑到被命名为 "冷桥 "的情况,确定了相关建筑物外墙的热传导阻力降低值。结果表明,这些导热夹杂物的影响很大。评估了每种导热夹杂物对传热系数的影响。结论是天花板等导热夹杂物对所研究房屋的传热影响最大。研究结果将有助于对采用整体框架的多层住宅建筑进行节能分析和设计。
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