【作者】 李玉梅；

【导师】 孙刚；

【作者基本信息】 哈尔滨工程大学 ， 热能工程， 2007， 硕士

【摘要】 在我国现行的标准规范中，墙体的平均传热系数和窗户的传热系数均没有考虑窗户洞口侧的热桥效应，而这部分影响是不可忽视的。按照《民用建筑热工设计规范》(GB50176-93)第4．3．5条规定，应对窗户洞口侧热桥的内表面温度进行温度场验算。本文利用FLUENT数值模拟软件模拟了实测墙体的温度场，直观的表示出计算面域的温度分布情况和热流的流向。对温度场进行了详细的分析，得出：大众新城小区和白毛小区的建筑结构在热流计的宽度范围内，温度基本呈线性分布，因而可以用热流计中点温度代表整个热流计测试位置的温度来定性计算传热系数，而汽轮机厂家属区的节能墙体，紧贴窗户洞口侧温度不是线性分布，为实验检测方案提供了重要的理论依据；同时，从数值模拟结果还可以较准确地评估窗户周边热桥的影响范围。在理论分析的指导下，本文采用热流计法对窗户旁边墙体的热流密度和对应位置的内、外表面温度进行了实验检测，并据此计算出各个测点的传热系数，分析了窗户旁边墙体的传热状况和热桥的影响范围，其中，汽轮机厂家属区的节能墙体的热桥影响范围最小，从应用的角度验证了理论模型及数值计算结果的准确性，给数值模拟传热的理论提供了发展的依据。本文还模拟了在室外温度周期性变化时，窗户旁墙体的非稳态热工性能，详细分析了墙体的延迟时间和衰减倍数等反映其热稳定性的物理量。更多还原

【Abstract】 In the present criterion of our country, the effect caused by the thermal bridge beside the windows is not given consideration in calculating the average heat transfer coefficient of walls and heat transfer coefficient of windows, which is not neglectable. According to the rule 4.3.5 in "Criterion for Thermal Capability of Residential Buildings"(GB50176-93), the checking computations of the temperature field for inner surface temperatures of the thermal bridge caused by windows should be done.In this paper, the FLUENT numerical simulation software are adopted to simulate the temperature field of the actual wall, which directly shows the temperature distribution of the computational zone’s and heat flux. By analyzing temperature field in detail, it was concluded that the middle temperature of the heat flow meter could be used to represent the temperature of the position measured for calculating the heat transfer coefficient, because the temperature in the building envelops of Dazhongxincheng residential area and Baimao residential area was in the range of the heat flow meter, also nearly linear. Nevertheless, the analysis indicated that the temperature in energy-saving walls close to windows in steamer factory’s residential area was not linear. All the conclusion mentioned above can provide theoretical bases for the test. Meanwhile, the scope of effect caused by the thermal bridge around the windows could be accurately estimated from the simulation results.On the basis of the analysis, the heat flow meter approach was used to detect the heat flux of walls beside the windows and temperatures of the inner surface and the outer surface in correspinding positions. According to these above, the heat transfer coefficient of each position measured was calculated, and the scopes of effect caused by the heat transfer of walls beside windows and the thermal bridge were analyzed. It was derived from analysis that the scope of effect caused by of thermal bridge energy saving walls in Qilunji factory’s residential area was the least one. The accuracy of the theory model and the computational results was validated from applications, also the reference was provided for the development of numerical simulation in heat transfer.In this paper, the unsteady-state thermal performance of walls beside windows was simulated with the temperature outside changing periodically. Additionally, the time delay and damping factor of walls were studied, which are the physical parameters that can show the thermal stability of walls.更多还原