不同设计理念在风机盘管机组制造与选型上的碰撞  

Collision of different design concepts in fan-coil unit manufacture and selection

作　　者：刘新民 Liu Xinmin(Xiamen)

机构地区：[1]不详

出　　处：《暖通空调》2023年第9期20-31,共12页Heating Ventilating & Air Conditioning

摘　　要：为夯实集中式空调冷水系统末端设备控制的研究基础,探索了常见冷水系统小温差运行的原因。通过对供冷工况风机盘管机组不同设计思维和研究思路的比较,从基本机理认知出发,摒弃了小流量大温差的传统思维。通过理论探索和实践尝试,对ASHRAE手册(2016)第13章第2.7节“一般冷却盘管换热特性”和第47章第3节“典型的循环加热或冷却盘管”性能曲线的相关论述提出质疑,指出冷盘管与热盘管、干盘管换热特性的本质性区别在于对空气中潜热处理的能力,采用空气侧与冷水侧的对数平均温差进行计算机辅助设计时需格外谨慎,避免出现本质性的结论谬误。强调热湿交换过程中能量传递在时间上存在显著的滞后,分析研究时应充分考虑。提出了一种非标准风机盘管机组超设计冷量选型和工程应用的解决方案。In order to strengthen the research foundation of terminal equipment control of centralized air conditioning chilled water systems,the reasons of common chilled water system small temperature difference operation are explored.By comparing different design thinking and research ideas of fan-coil units under cooling conditions,starting from the basic mechanism cognition,the traditional thinking of small flow rate and large temperature difference is abandoned.Through the theoretical exploration and practical attempts,the ASHRAE manual(2016),chapter 13,section 2.7“General cooling coil heat transfer characteristics”and chapter 47,section 3“Typical circulating heating or cooling coil”performance curves are questioned.It is pointed out that the essential difference of heat transfer characteristics between cooling coils,heating coils and dry coils lies in the ability to deal with the latent heat in the air,and that extra caution is needed when using the logarithmic average temperature difference between the air side and the chilled water side for computer-aided design to avoid essential fallacies in the conclusions.It is emphasized that there is a significant time lag in energy transfer during the heat and humidity exchange process,which should be fully considered in the analysis and study.A solution of super design cooling capacity selection and engineering application of non-standard fan-coil units is proposed.

关 键 词：风机盘管机组 冷盘管 热盘管 小流量 大温差 低流速 对数平均温差 换热时间 

分 类 号：TU831.4[建筑科学—供热、供燃气、通风及空调工程]