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摘要 通过文献阅读、实验研究、工程调查，分析了现行的地板送风系统负荷计算和送风量确定过程中存在的主要问题。实验室实验和工程实践结果表明：在国内采用地板送风系统的一般办公室中，很难形成空气分层，分层与否影响空调送风量，而送风量又决定了空气是否分层；地板送风系统的负荷和送风量计算与顶送风常规空调系统并无本质区别，考虑到人体舒适感，地板送风系统的送风温度更高，送风量一般明显大于顶送风常规空调系统。空调负荷和送风量计算是地板送风系统设计中的关键，其正确与否，不但影响系统的经济性，而且还会影响系统的可行性，有必要进行深入的研究、分析和探讨。 关键词 地板送风系统 负荷计算 送风量 空气分层 Identification of air conditioning energy conservation technologies and measures（2）: some uncertain points in UFAD system design(Ⅰ) By Yin Ping Abstract Analyses the main problems of load and total supply air rate calculation in the actual underfloor air distribution (UFAD) systems based on literature consulting, experimental studies and engineering surveys. Laboratory experiments and engineering practice reveal that it is difficult to form the room air stratification in ordinary offices in which the UFAD system is adopted, and the supply air rate depends on whether the room air stratification forms or not and the supply air rate in turn influences formation of the stratification; and that there is little essential difference between the UFAD system and conventional overhead (OH) system in load and total supply air rate calculation and considering human comfort，the supply air by an UFAD system provides higher temperature and the total air flow rate is generally larger than that of OH system significantly. The calculation of air conditioning load and the total air flow rate as the key issue in UFAD system designing, its correctness will affect the economic results and the practicability of the system, therefore needing deepened research and discussion. Keywords UFAD system， load calculation， supply air rate， air stratification