The study of the effect of solar radiation on the built environment is a significant subject especially in the radiant systems and it is increasingly important because large glazed envelopes are widely adopted in modern architecture. In this paper, a radiant heating system was analyzed the effect of solar radiation on indoor thermal comfort using CFD simulations and experiments.

The results show that the existence of the sunspot on the floor and the heated window significantly affect the indoor thermal behaviors. Occupants could feel local discomfort near the superheated surfaces even if they can maintain global thermal comfort in most areas of the room in the presence of solar radiation. The local thermal comforts of three cases were studied and compared. Compared to the Case without solar radiation, the vertical air temperature difference (VATD) between the ankle and the head is smaller near the window. But the low-temperature fresh air from the air inlet may cause a high VATD and draught rate (DR), particularly in the cold season. When solar radiation was included, the radiant asymmetry at head level is about 4 °C higher than that of when solar radiation was not included. It is found that the interior shading can alter thermal behaviors in a radiant system. The important suggestions of this study are to reduce the difference between the radiant panels temperature and the supply air temperature while maintaining heat balance in a radiant heating system and properly controlling the temperature of the superheated surfaces in the presence of solar radiation.

研究太阳辐射对建筑环境的影响是一个重要的课题，尤其是在辐射系统中，并且它越来越重要，因为在现代建筑中广泛采用了大型玻璃围护结构。在本文中，使用CFD模拟和实验分析了辐射供暖系统对太阳辐射对室内热舒适性的影响。

结果表明，地板上存在黑子和加热的窗户显着影响了室内的热行为。即使在有太阳辐射的情况下，乘员在房间的大部分区域都可以保持整体的热舒适性，他们也可能会在过热的表面附近感到局部不适。研究并比较了三种情况的局部热舒适性。与没有太阳辐射的情况相比，脚踝和头部之间的垂直空气温度差（VATD）在窗户附近较小。但是，进气口中的低温新鲜空气可能会导致较高的VATD和通风率（DR），尤其是在寒冷季节。当包括太阳辐射时，头部水平的辐射不对称性比不包括太阳辐射时高约4°C。发现内部阴影可以改变辐射系统中的热行为。这项研究的重要建议是减少辐射板温度和送风温度之间的差异，同时保持辐射加热系统中的热量平衡，并在存在太阳辐射的情况下适当控制过热表面的温度。