利用频域有限元法分析内嵌管式辐射地板频域热特性

分析内嵌管式辐射地板的频域热特性,便于进一步了解内嵌管式辐射地板的动态热特征,为辐射地板的系统和控制设计提供重要的参考依据。建立了内嵌管式辐射地板的频域有限元模型,同时采用ANSYS软件建立了内嵌管式辐射地板的时域传热模型,通过2个模型的对比说明了频域有限元模型的准确性。采用频域有限元模型计算并分析了内嵌管式辐射地板的频域热特性。结果表明,在低频区域,地板的频域热响应基本不随频率变化,其传热过程接近于稳态,而在高频区域,地板的频域热响应随频率的变化十分剧烈,地板传热呈现明显的动态特征。当房间内存在较多成分的高频热扰时,关于辐射地板的传热计算应采用动态计算方法。

Analysis on frequency thermal characteristics of pipe-embeddedradiant floor based on frequency-domain finite element method

Analyzing the frequency thermal characteristics of the pipe-embedded radiant floor may give a further insight into its dynamic thermal performance and important guidelines for the system and control design. A frequency-domain finite element model of the pipe-embedded radiant floor is developed. The time-domain model of this structure is also developed by using ANSYS (ANAYS model) for reference. The accuracy of the frequency-domain finite element model of this structure is evaluated by comparing its results with that of the ANSYS model. The frequency thermal characteristics of the pipe-embedded radiant floor are calculated and analyzed by using this frequency-domain finite element model. The frequency thermal responses of the pipe-embedded radiant floor are basically unchanged with the frequency in low-frequency range while change rapidly in high-frequency range. Therefore dynamic calculation method should be adopted in predicting the heat transfer of the pipe-embedded radiant floor especially when high-frequency thermal disturbances are dominant in the room.