在建筑模拟程序中，采用质量和能量平衡方法来描述具有固定气流的平行风机驱动终端单元（FPTU）的性能。该方法包括在一个由风扇供电的并联终端单元中，为每个组件（加热线圈、风扇/电机组合和混合器）建立相关的质量和能量平衡方程。考虑了加热盘管的两个位置。一个被指定为传统配置的位置位于装置的排放口。第二个位置被指定为替代配置，位于二次空气入口。 固定气流并联风扇驱动终端装置使用风扇电机，包括由可控硅整流器控制的永久分裂电容器电机或电子换向电机。本文演示了如何将永久分裂电容器和电子换向电机的风扇/电机组合性能模型纳入质量和能量平衡方法。这些风扇模型是根据多家FPTU制造商提供的性能数据开发的。风扇/电机性能数据包括FPTU，风扇气流范围为250至3500 ft³/min（0。 118至1.65 m³/s），电机尺寸范围为0.333至1 hp（249至746 W）。模型中包括泄漏。该系统在工程方程求解器（EES）中实现，提供的结果说明了冷却和加热操作中泄漏的影响。引用:2016年年度会议，密苏里州圣路易斯，2016年交易，第122卷。2.

A mass and energy balance approach was used to characterize the performance of parallel fan-powered terminal units (FPTUs) with fixed airflow for applications in building simulation programs. The approach included developing relevant mass and energy balance equations for each component--heating coil, fan/motor combination, and mixer--in a parallel fan-powered terminal unit. Two locations of the heating coil were considered. One location, designated as the traditional configuration, was at the discharge of the unit. The second location, designated as the alternative configuration, was at the secondary air inlet. Fixed-airflow parallel fan-powered terminal units use fan motors that include either permanent split capacitor motors controlled by silicon controlled rectifiers or electronically commutated motors. This paper demonstrates how to incorporate fan/motor combination performance models for both permanent split capacitor and electronically commutated motors into the mass and energy balance approach. These fan models were developed from performance data provided by multiple FPTU manufacturers. The fan/motor performance data included an FPTU, a fan airflow range from 250 to 3500 ft3/min (0.118 to 1.65 m3/s), and a motor size range from 0.333 to 1 hp (249 to 746 W). Leakage was included in the models. The system was implemented in Engineering Equation Solver (EES) and results provided to illustrate the effect of leakage in both cooling and heating operations.