The stratified air conditioning systems are widely used in large space buildings. Stratified air conditioning load (SACL) is the basis for determining the cooling capacity of air conditioning system, and it is also the key to assess its energy savings of stratified cooling. Calculation of the radiant heat transfer load (RHTL) is the difficult point to determine the SACL. In recent years, there have been many researches on the calculation of SACL. Most of them are steady-state calculation processes, and there are few studies on dynamic calculation processes. Therefore, the RHTL is taken as the research object, a novel calculation method is proposed according to the harmonic reaction method (HRM) and verified by the experiments. Experimental radiant heat transfer load can be received through convection and radiation separating method. The experimental and theoretical values of RHTL were compared and it was found that the theoretical values were in good agreement with experimental values. Therefore, the proposed method can be used to predict the unsteady RHTL accurately. Based on the verified calculation method, the effects of outdoor climatic conditions, building types and stratified heights on RHTL of an actual large space building are analyzed, which will contribute to the design and optimization of stratified air conditioning system for large space buildings.

分层空调系统广泛用于大型建筑物。分层空调负荷（SACL）是确定空调系统冷却能力的基础，也是评估分层冷却节能的关键。辐射热负荷（RHTL）的计算是确定SACL的难点。近年来，对SACL的计算已有许多研究。它们大多数是稳态计算过程，而关于动态计算过程的研究很少。因此，以RHTL为研究对象，根据谐波反应法（HRM）提出了一种新的计算方法，并通过实验进行了验证。通过对流和辐射分离方法可以承受实验性辐射传热负荷。比较了RHTL的实验值和理论值，发现其理论值与实验值吻合良好。因此，所提出的方法可以用来准确地预测非稳态RHTL。基于验证的计算方法，分析了室外气候条件，建筑物类型和分层高度对实际大型空间建筑物的RHTL的影响，这将有助于大型空间建筑物的分层空调系统的设计和优化。