A novel approximate harmonic method for the dynamic cooling capacity prediction of radiant slab floors with time variable solar radiation
A novel approximate harmonic method for the dynamic cooling capacity prediction of radiant slab floors with time variable solar radiation
复制标题
一种新颖的近似调和方法，用于预测随时间变化太阳辐射的辐射板地板的动态冷却能力
DOI：
10.1016/j.enbuild.2020.110117
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发表时间：
2020-09-15
影响因子：
6.7
通讯作者：
Li, Chunying
中科院分区：
文献类型：
--
作者：
Tang, Haida;Zhang, Tao;Li, Chunying
玻璃幕墙的入射太阳辐射照射在地板辐射冷却系统上，增大了地板辐射冷却系统的制冷量。本文采用一种新颖的近似谐波方法，导出了时变太阳辐射作用下辐射楼板动态热响应的解析表达式。利用多层辐射楼板的热特性计算衰减率和滞后时间等特征参数来表征太阳辐射波的热响应。将近似谐波法的计算结果与辐射楼板三维模型的计算结果进行了比较，以评价近似谐波法的偏差。结果表明，采用近似谐波方法计算的动态传热过程与三维模型吻合较好。具体而言，采用近似谐波法计算的设计日瞬态地板表面温度和制冷量与三维模型计算的结果接近，均方根误差分别小于0.25℃和1.6 W/m(2)。根据新的近似谐波方法，辐射地板比热的增大增大了其衰减速率，减小了时变太阳辐射对制冷量影响的波动范围。(C) 2020 Elsevier B.V.版权所有
The incident solar radiation from glass curtain walls shinning on the radiant floor cooling system enlarges its cooling capacity. In this study, an analytic expression using a novel approximate harmonic method is derived for the dynamic thermal response of the radiant slab floor with time variable solar radiation. The characteristic parameters, namely the decay rate and time lag which could be calculated by the thermal properties of the multi-layered radiant slab floor, are introduced to characterize the thermal response of the solar radiation waves. We compared the results calculated using the novel approximate harmonic method with that using a three-dimensional model of the radiant slab floor to evaluate the deviation of the novel approximate harmonic method. The results indicated that the dynamic heat transfer process calculated through the novel approximate harmonic method accords well with the three-dimensional model. Specifically, the transient floor surface temperature and cooling capacity in a design day calculated using the novel approximate harmonic method were close to that by the three-dimensional model with Root Mean Square Errors below 0.25 degrees C and 1.6 W/m(2), respectively. According to the novel approximate harmonic method, the augment of the specific heat of the radiant floor increases the decay rate and decreases the fluctuation range of the cooling capacity influence by the time variable solar radiation. (C) 2020 Elsevier B.V. All rights reserved.