采用蒸发冷却的辐射供冷空调系统室内热环境模拟验证

Simulation Study on Indoor Thermal Environment of Radiant Cooling System Based on Evaporative Cooling

我国西北地区夏季气候干燥,蒸发冷却技术能以较高的COP值提供辐射供冷和新风系统需要的高温冷水和冷风,形成基于蒸发冷却的辐射供冷空调系统。介绍了复合系统的工作原理和流程,在此基础上,采用Airpak软件模拟了地板辐射供冷加置换通风复合系统以及顶板辐射供冷加置换通风复合系统的室内热环境。模拟结果表明,采用地板辐射供冷的复合系统室内垂直温度梯度大于顶板辐射供冷的复合系统,两系统室内温度场均匀,符合设计要求,并且0.1m和1.1m高对应的室内垂直温度差值均小于3℃,符合ISO7730规定的舒适性标准。CFD模拟结果与试验结果吻合良好,可采用该模拟方法进一步研究复合系统室内热环境。

In northwest China,because of the hot and arid summer climate,the cooled water of radiant cooling and cooled fresh air can be provided by evaporative cooling method with a high COP.That constitutes a hybrid radiant cooling air conditioning system based on evaporative cooling.The schematic diagram of the hybrid system was introduced.The indoor thermal environment of radiant floor and displacement ventilation system as well as chilled ceiling and displacement ventilation system were simulated by software Airpak.The simulation results indicated that the vertical temperature difference of the former system was higher than that of the later system.The corresponding temperature differences between 0.1m and 1.1m heights of both systems were lower than 3℃,the recommended comfort value of ISO7730 comfort standard.The simulated indoor air temperatures meet the designed criteria.The numerical simulation results coincided well with experimental data.Indoor thermal environment of proposed hybrid system can be further studied by this method.