在以玻璃幕墙、天窗和金属屋顶为主要围护结构的机场、火车站等大空间建筑中，地板辐射供冷是一种有效的显热排出终端，可与高温墙面直接进行长波辐射换热，吸收太阳辐射。金属和许多先进材料（如low-e涂层）的发射率在0.2到0.9之间，这与传统建筑材料的发射率（0.9到0.95）有显著不同。文献中长波辐射换热的计算方法是以壁面发射率在0。 9~0.95，不适用于低发射率材料的场合。本文提出了一种新的计算不同发射率的地板辐射面与室内墙面长波辐射换热的简便方法。结合大空间建筑常用材料的发射率数据，对新方法的精度进行了估计，并与文献中现有的计算方法进行了比较，表明考虑发射率影响的计算方法更适合于大空间建筑辐射地板的制冷量预测。 引用:ASHRAE论文:2015年ASHRAE年会，伊利诺伊州芝加哥

In large space buildings, such as airports and railway stations, the envelope of which is dominated by glass facade, skylight and metal roof, radiant floor cooling is an effective sensible heat remove terminal for its direct longwave radiant heat exchange with high-temperature wall surface and absorption of solar radiation. The emissivity of metal and many advanced materials (such as low-e coating) range from 0.2 to 0.9, which are markedly different from the emissivity of traditional building materials (between 0.9 and 0.95). The calculation methods of the longwave radiant heat exchange in literatures were based on the precondition that the emissivity of the wall surfaces are in the range of 0.9~0.95, which are not suitable for the occasion with low-emissivity materials. In this paper, a new simple calculating method of the longwave radiant heat exchange between the radiant floor surface and indoor wall surfaces with different emissivity is proposed. Combined with the emissivity data of common materials in large space buildings, the accuracy of the new method is estimated and compared with current calculation methods in literatures, which shows that the calculating method taking the influence of emissivity into consideration is more suitable for predicting the cooling capacity of radiant floor in large space buildings.