地板送风系统温度分层现象对能耗模拟程序的要求

Software Requirement of Energy Consumption Simulation Due to the Air Temperature Stratification in the Underfloor Air Distribution System

地板送风系统的室内温度分层现象对准确预测系统能耗非常重要。目前,大部分用来计算能耗的程序都采用同一的室内温度假设。对天花板送风系统(即混合送风系统)而言,由于空调送风与室内气流混合充分,利用同一室内温度进行能耗分析是准确合理的。而对地板送风系统而言,特别是大空间,室内温度分层是该系统的本质特性,只有从根本上模拟温度分层特性,才能保证能耗分析软件的真实有效性。对地板送风系统采用同一室内温度进行能耗分析并不妥。因此,首先阐述了地板送风系统温度分层现象,分析了该系统的优点。其次,针对温度分层现象,介绍了地板送风系统能耗分析模型和负荷减小系数概念。最后,列举了国外几个常用的模拟程序,指出对地板送风系统,能耗模拟程序需注意或要解决的问题。

In the undeoqoor air distribution （UFAD） system, the indoor air stratification plays an important role for the accurate predic- tion of system energy consumption. To date, most simulation programs utilize the uniform indoor air temperature as the base for energy con- sttmption sinud^iom For the mixing ventilatiort system （ceiling-level supply air）, this assumption is appropriate and validated by experimental data, However, for the UFAD system, indoor air temperature stratifwation is essential, especially for large space. Simulation program should in- volve the temperature stratification in order to obtain accurate results for the UFAD system. The characteristics of air temperature stratification are presented, as well as the mathematics model, involving air temperature stratification. Four simulation programs are compared, proposing what the programs should solve to accurately simulate energy consumption far the UFAD system.