大空间下送风夏季非稳态全热B-G模型研究

Study on Transient Total Heat B-G Model of Air Supply in Large Space during Summer

本文针对一实际运行的下送风分层空调大空间建筑,引入谐波法求解具有蓄热特性的围护结构内壁面温度,利用不稳定实验结果考虑室内空气蓄热,并结合室内散湿特点,建立了夏季非稳态全热6区Block-Gebhart(B-G)模型。通过现场热环境在8个工况下进行对比实验研究,结果表明:离地以上的1~4区,空气温度和壁面温度的理论预测值与实验值平均绝对误差分别为0.44~1.12℃和0.63~1.96℃,室内空气焓值为1.85~1.96 kJ/kg;接近屋顶的5区、6区空气温度、壁面温度、空气焓值误差较大,并低于实验结果;说明采用谐波法以及实验结果解析大空间热环境不稳态解是可行的。

In this study,the harmonic method was introduced to solve the inner wall temperature problems of an envelope structure with heat storage characteristics in a large-space building with stratified air conditioning.The transient experimental results were used to calculate the heat storage of the indoor air.Combined with the diffusion characteristics of the indoor moisture,the transient full-heat six-zone Block-Gebhart(B-G)model was established under summer operating conditions.The results showed that the average absolute errors were between 0.44-1.12℃and 0.63-1.96℃,in terms of the differences between the predicted and experimental values of the air and wall temperatures in the four regions above ground level,respectively,while the indoor air enthalpy was 1.85-1.96 kJ/kg.However,the errors in air and wall temperature,as well as the air enthalpy in the fifth and sixth zones close to the roof were higher and the predictions lower than the experimental results.The results showed that it was feasible to use the harmonic method and experimental results to analyze the transient solution of the thermal environment in large-space buildings.