采用工程方程求解器（EES）（Klein and Alvarado 2015）实现了质量和能量平衡（MEB）方法，以估算单风管可变风量（VAV）系统的年度能量性能，该系统采用固定和可变气流并联风机驱动终端装置（FPTU）。评估了由可控硅整流器控制的永久分裂电容电机和电子交流电机（ECM）的风扇，以及泄漏的能量影响。还对变量进行了比较- 和固定气流系列FPTUs。五区建筑中的每小时分区广告是使用Energy Plus生成的。每小时区域负荷和天气数据被用作单管道VAV系统模型的输入，使用EES估算五个城市五个区域建筑的能源使用:德克萨斯州休斯顿；亚利桑那州凤凰城；伊利诺伊州芝加哥；纽约；结果显示，固定气流ECM和PSCparallel FPTUs之间的能耗差异不到0.4%。可变气流并联装置提供的最大值为0。 与基线固定气流平行FPTU相比，节省8%。对并联FPTU模拟了冷却模式下5%和10%的泄漏。泄漏率为5%的并联机组与可变气流串联机组的性能相当。在所有五个城市中，将泄漏增加到10%否定了并联机组相对于可变气流串联机组的任何好处。引用:2019年冬季会议，佐治亚州亚特兰大，技术论文

A mass and energy balance (MEB) approach was implementedusing Engineering Equation Solver (EES) (Klein andAlvarado 2015) to estimate the annual energy performanceofasingle-duct variable-air-volume(VAV)system with fixedandvariable-airflow parallel fan-powered terminal units(FPTUs). Fans with both permanent-split capacitor motorscontrolled by silicon control rectifiers and electronicallycommutated motors (ECMs) were evaluated, along with theenergy impact of leakage. A comparison was also providedto variable- and fixed-airflow series FPTUs. Hourly zoneloads in a five-zone building were generated using Energy-Plus. The hourly zone loads and weather data were used asinput to a single-duct VAV system model using EES to estimatethe energy use for a five-zone building in five cities:Houston, TX; Phoenix, AZ; Chicago, IL; New York, NY; andSan Francisco, CA. The results showed less than 0.4% differencein energy use between the fixed-airflow ECM and PSCparallel FPTUs. Variable-airflow parallel units provided amaximum of 0.8% savings compared to the baseline fixedairflowparallel FPTU. Leakages of 5% and 10% in coolingmode were simulated for parallel FPTUs. Parallel units with5% leakage performed comparably to variable-airflowseries units. Increasing leakage to 10% negated any benefitthat a parallel unit had over the variable-airflow series unitsin all five cities.