基于频域回归法的混凝土辐射供冷楼板非稳态传热模型的建立及验证

Establishment and Validation of a Dynamic Heat Transfer Model for Concrete Core Cooling Slab Based on Frequency-Domain Regression Method

以辨识理论和反应系数法为基础,利用频域回归法计算混凝土辐射供冷楼板热力系统吸热和传热反应系数,建立混凝土辐射供冷楼板的二维非稳态传热模型.通过实验数据对所构建模型的计算结果进行验证.结果表明:稳态工况热流密度误差不超过6%,,表面温度误差在0.3,℃以内;非稳态工况热流密度误差不超过9%,,表面温度误差在0.5,℃以内.最后利用该模型计算了工程常用混凝土辐射供冷楼板的传热延迟时间,为其系统的负荷计算和运行策略提供参考.

Based on the identification theory and reaction coefficient method,two-dimensional dynamic heat transfermodel of concrete core cooling slab is established.In this model,the thermal response factors of concrete core coolingslab are calculated by frequency-domain regression method.The model is validated with the experimentaldata.The errors of slab surface heat flux and surface temperature are within 6%, and 0.3,℃ respectively under steadyconditions and within 9%, and 0.5,℃ respectively under unsteady conditions.The result indicates that the calculationsof the model have good coincidence with the measurement.Finally,using the model,the delay time from pipe toindoor is computed which can provide reference for the load calculation and operation strategy of this system.