需求控制通风（DCV）有可能通过根据CO2水平替代指示提供的占用水平降低通风率来节约能源。然而，安装、设计或操作不当的系统可能会以牺牲室内空气质量（IAQ）为代价节约能源，或以牺牲能源为代价提高室内空气质量。这些结果可能会破坏原本可行的能源效率措施的形象。本文报告了作者认为的DCV系统设计、安装和运行中的常见问题，该系统使用二氧化碳作为占用水平的替代物。 调查了六个暖通空调系统:两个商业办公室、两个医疗办公室和两个学校环境。对设计图纸、空气平衡报告和当前设备设置进行了调查。四个系统通过屋顶单元控制逻辑进行本地控制，两个系统由中央建筑能源管理系统控制。对设备进行功能测试，并记录系统参数，包括二氧化碳水平、风扇状态和气流温度。 功能测试分为三个系统方面。首先，进行二氧化碳控制信号功能测试，以确认二氧化碳传感器和外部空气挡板定位之间的控制链路已就位。其次，进行传感器布置功能测试，以确认传感器布置能够准确报告控制区的CO2水平。第三，通过检查空气平衡报告来进行室外空气（OSA）水平测试，以确定OSA率，并确认系统符合DCV标准。 研究发现，由于多种原因，没有一个系统能够正常运行，其中一些原因是相互重叠的。非功能性的原因包括传感器放置不当、机械明细表或设计文件中提供的信息不正确、风扇循环问题以及安装不当。将介绍故障模式的详细信息。将解释适当的工程文件要求。将介绍TAB的测试、调整、平衡（TAB）规范和DCV特定要求，以及建筑运营商需要了解的有关系统运行的信息。 引文:内华达州拉斯维加斯ASHRAE会议论文

Demand control ventilation (DCV) has the potential to save energy by reducing ventilation rates in accordance with occupancy levels provided by the surrogate indication of CO2levels. However, improperly installed, designed, or operated systems may save energy at the expense of Indoor Air Quality (IAQ) or enhance IAQ at the expense of energy. These outcomes may have the potential to foul the image of an otherwise viable energy efficiency measure. This paper reports what the authors believe to be common problems in the design, installation and operation of DCV systems which use CO2as a surrogate for occupancy levels.Six HVAC systems were investigated: two commercial offices, two medical offices, and two school environments. The design drawings, air balance reports, and current equipment set up were investigated. Four systems were controlled locally through roof top unit control logic and two systems were controlled by central building energy management systems. Functional testing of equipment was carried out and system parameters were logged including CO2levels, fans states, and air stream temperatures. Functional testing was broken up into three system aspects. First, CO2control signal functional testing was conducted to confirm that the control link between CO2sensors and outside air damper positioning was in place. Second, sensor placement functional testing was conducted to confirm that the sensors placement could accurately report the CO2levels of the controlled zone. Third, the Outside Air (OSA) level test was conducted by inspecting the air balance reports to determine the OSA rates and to confirm that the system was balanced in accordance with DCV standards.The study found that no systems were functioning properly for a number of reasons, some of which were overlapping. Reasons for non-functionality included poor sensor placement, improper information provided in mechanical schedules or design documents, fan cycling issues, and poor installation. Details on failure modes will be presented. Proper engineering documentation requirements will be explained. Test, Adjust, Balance (TAB) specifications and DCV specific requirements for TAB along with information that building operators need to know about system operation will be presented.