不同风系统末端装置的能效比比较
Comparison of EERt between different terminal devices of air systems
摘要：
从设计与运行角度对3种常见空调系统形式——风机盘管加新风系统、定风量系统、变风量系统的末端能效比进行了比较，比较内容包括市场典型厂家风机盘管、空调机、新风机单机末端能效比及考虑新风机后的综合末端能效比；同时对比了几栋大型公共建筑案例设计及实际末端能效比。结果表明，由于设计选型偏大等多种因素，设计末端能效比仅能达到市场综合末端能效比的一半。在设计阶段，输送相同的冷量，风机盘管加新风系统能耗为全空气系统的一半左右。除了运行良好的变风量系统，实际末端能效比均比设计值有所下降。从实际案例来看，风机盘管加新风系统的实际末端能效比在13左右，变风量系统为6，定风量系统只有4。
Abstract：
Compares the rated, designed and practical EERt(energy efficiency ratio of terminal system) of different terminal devices between three typical air systems—fan coil unit plus outdoor air handle unit system (FCU+OA), constant air volume system (CAV), variable air volume system (VAV). Calculates the EERt with and without consideration of outdoor air handle unit system of each air system. Compares the designed and practical EERt among several large public buildings. Compared with rated parameters, designed EERts decrease about 50% in actual design projects. The energy consumption of FCU+OA system is about 50% of that of all-air system for the same cooling supply in design. Practical EERts are usually less than design parameters except in well designed VAV system. As a result of cases study, the practical EERt of FCU+OA system is around 13, that of VAV system is 6 and that of CAV system is 4.
Keywords:EERt of terminal device，FCU+OA system，CAV system，VAV system