本研究项目利用三种全数据趋势，对可变风量（VAV）系统（采用直接数字控制（DDC））在较长时间内重新调试过程的效益和寿命进行量化。从DDC性能角度判断系统性能，包括建筑物增压、室外空气量、管道静压、区域流量、温度控制以及建筑物增压。在重新调试过程之前、重新调试之后以及延长期限（至少6个月到最多2年）之后，对控制系统性能进行了考虑。 结果与最初的设计意图进行了比较。

This research project quantifies the benefits and the longevity of the recommissioning process on variable air volume (VAV) systems that incorporate direct digital control (DDC), over an extended period, utilizing three full data trends. System performance was judged from a DDC performance perspective and included building pressurization, outdoor air quantity, duct static pressure, zone flow, temperature control as well as building pressurization. Control system performance was considered prior to the recommissioning process, immediately after recommissioning and after an extended period (a minimum of 6 months to a maximum of ~2 years). Results were compared to the original design intents.