通过使用直接数字控制（DDC）系统编程逻辑，以及通过创建简洁的楼宇监控系统（BMS）屏幕来对供暖、通风和空调（HVAC）系统进行故障诊断，建筑操作员可以节省大量时间。这些方法还可以降低能源成本。一个成熟的能源效率实用程序使用DDC系统控制逻辑中的基本湿度公式和参数来检查传感器性能、改进设备操作，以及验证阀门和阻尼器的操作。相对湿度传感器控制加湿器和除湿盘管，并被间接用于计算省煤器中的焓。将基本暖通空调公式应用于DDC控制逻辑，可以识别相对湿度传感器中的不准确，如果不进行纠正，可能会导致省煤器性能不佳，或不必要的加湿和除湿。 这些问题经常会增加暖通空调的运行成本。效率实用程序还计算了室外空气露点，以检查传感器性能并优化冷却器和加湿系统性能。本文定义了几种条件下的露点，描述了它与相对湿度的区别，并描述了露点在潜在和显式冷负荷和热负荷上的变化。它还介绍了湿度事实，以及如何使用它们来检查HVAC系统的性能。将该逻辑编程到DDC中涉及简单的“如果”语句，可以识别故障传感器。引用:2016年年度会议，密苏里州圣路易斯，会议论文

Building operators can save significant time by using direct digital control (DDC) system programming logic, and by creating concise building monitoring system (BMS) screens to troubleshoot heating, ventilating, and air conditioning (HVAC) systems. These approaches can also lower energy costs. A mature energy efficiency utility uses fundamental psychrometric formulas and parameters in DDC systems' control logic to check sensor performance, improve equipment operation, and verify valve and damper operation. Relative humidity sensors control humidifiers and dehumidification coils, and have been used indirectly to calculate enthalpy in economizers. Applying fundamental HVAC formulas to DDC control logic identifies inaccuracies in relative humidity sensors, which—if left uncorrected—can result in poor economizer performance, or unnecessary humidification and dehumidification. These problems frequently increase HVAC operating costs. The efficiency utility has also calculated outdoor air dew-points to check sensor performance and optimize chiller and humidification system performance. This paper defines dew-point under several conditions, describes how it differs from relative humidity, and describes dew-point changes on latent and sensible cooling and heating loads. It also presents psychrometric facts and how they can be used to check HVAC system performance. Programming this logic into the DDC involves simple "if" statements and can identify faulty sensors.