The weather in east china , hot and humid , is quite different from that in scandinavia region . since the indoor environment is closely related to the outdoor natural condition , many conclusions on displacement ventilation drawn in other countries may not be suitable for applications in china . therefore , it is necessary to study further effect of the existence of water vapor on displacement ventilation and to analyze humidity control problems 已有的关于置换通风的研究大都是植根于欧美自然气候条件下进行的，而我国华东大部分处于亚热带地区，夏季炎热潮湿，这和北欧地区干燥的气候有很大的差异，有必要进一步研究空气中水蒸气含量对置换通风系统的影响以及与系统的湿度控制相关的问题。
