动态热湿气候风洞实验台的研制

Development of Dynamic Laboratory of Hot-Humid Climatic Wind Tunnel

研制风速、温度、湿度、热辐射参数的小时间步长周期性控制的模拟实验环境,是实现建筑围护结构热工性能的重复性实验、研究多孔建筑材料在自然气候要素下被动蒸发降温问题的重要手段.文中研制了一种热湿气候动态风洞实验台.该实验台除具有可调低速风外,还通过设置红外灯、加热与制冷、加湿与除湿装置,初步实现了对室外自然气候要素如太阳辐射、风速及温湿度环境的模拟控制.热湿气候风洞环境测控系统以计算机为核心,通过数据采集卡完成数据采集、反馈和控制指令输出,实现了风洞中环境参数的实时检测、数值显示和数据保存等.经专业机构校正,风洞内辐射照度、风速、温度和湿度的控制精度分别为±10W/m2、±0.2m/s、±0.5℃和±5%.

A simulated experimental environment of small-step periodically-controlled climatic parameters, such as air velocity, temperature, humidity and heat radiation, is important to the repeated experiments of thermal performance for building envelope structures, and is effective in the investigation of passive evaporative cooling effect of porous materials in natural climate. This paper develops a dynamic laboratory of hot-humid climatic wind tunnel, in which the low-speed air flow is adjustable and the infrared light, the humidifier as well as the heating/cooling facility are set up, thus primarily implementing the simulation and control of such natural environmental elements as solar radiation, air velocity, temperature and humidity. The PC-based measurement and control system of the hot-humid climatic wind tunnel uses a data collector block to manage the data collection, the data feedback and the control instruction output. Thus, the environmental elements can be real-timely examined, numerically displayed and effectively saved. It is shown from special mechanism calibration that the control precisions of solar radiation, air velocity, temperature and humidity in the developed dynamic laboratory are respectively ±10 W/m^2,±0.2 m/s, ±0.5℃ and ±5%.