基于CFD的严寒地区某工业厂房冬季供暖末端研究

Performance Investigation of Heating Terminals of an Industrial Factory in Northwest China Based on CFD

通过现场测试和计算流体动力学(CFD)模拟,对严寒地区某工业厂房冬季包括送风供暖和辐射供暖两种形式的5种不同的供暖末端进行了研究,以期能够进一步优化室内温度分布以及降低供暖能耗。结果表明,实际运行中室内供暖仅采用散热器,冷空气入侵对室内温度有很大影响,厂房的室内温度未达到设计温度16℃,甚至大门附近室内空气温度可能达到0℃以下。此外,供暖方案模拟表明,热风机难以将暖空气送至人员工作区域,并且会导致较大的垂直温度梯度与室内温度分布不均,从而增大所需供热量。散热器与燃气辐射管供暖的空间均匀性较差,在水平1.5m高度处的最大温差接近5~8℃,可考虑用作局部加热设备。而采用辐射地板可以以最少的热量供应达到相同的平均操作温度。

Indoor thermal environment and the effects of different heating terminals in an industrial factory in the cold region of China are investigated by performing on-site measurements and computational fluid dynamics(CFD) simulations. Five heating terminals, including air-supply and radiation systems, are simulated and compared to further optimize the indoor temperature distribution. The test result shows only radiator used for indoor heating in actual operation, and cold air infiltration has a great influence on indoor temperature, making the indoor temperature of the factory cannot reach the designed temperature of 16 ℃, and the indoor air temperature near the gate even reaches below 0 ℃. The simulation results show that it is difficult to send hot air to the occupant zone which results in a large vertical temperature gradient and uneven indoor temperature distribution so that make the increase of heat requirement. Both radiator and fired-gas radiant tubes exhibit poor spatial uniformity, where the maximum temperature difference at the height of 1.5 m approaches 5~8 ℃, which can be considered as local heating equipment. The heating mode combining the radiator and radiant floor helps to achieve a better spatial temperature uniformity and a lower horizontal temperature fluctuation.