介绍了暖通空调系统(HVAC) 故障检测与诊断(FDD) 的概念,发生故障的原因以及主要的故障检测与诊断方 法,比较了常用的故障检测与诊断方法的优缺点,分析了国内、外暖通空调故障检测与诊断的研究现状和应用情况,对暖 通空调故障检测与诊断的发展过程与方向进行了总结和展望
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HVAC节点环境参数测试,采用DS18B20,湿度模块,测量温湿度,并控制光照度,风扇。数码管显示
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HVAC Manual ASHRAE-F2005
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HVAC Manual ASHRAE-2005
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HVAC Manual ASHRAE-2005
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HVAC Manual ASHRAE-2005
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HVAC Manual ASHRAE-2005
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HVAC 风机三相 ECM 电机控制器(原理图+PCB+设计说明+BOM)HVAC 风机三相 ECM 电机控制器(原理图+PCB+设计说明+BOM)
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●抗线路接反功能可在线路跨接出错时为技术员节省查找故障所消耗的大量时间; ●采用与 RS-485 相同的外引脚,无需重新设计电路板; ●总线引脚能承受 –35V 至 +40V 之间的故障,可为典型 24 Vac HVAC 电源最大限度地降低直接短路所造成的损害; ●多达 32 个节点的高输入阻抗可在统一网络上支持多节点,无需中继器,从而可降低系统成本
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上传时间: 2013-06-22
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When a system designer specifies a nonisolated dc/dc powermodule, considering the needed input voltage range isequally as important as considering the required performanceattributes and features. Generally, nonisolated moduleshave either a narrow or a wide input voltage range. Narrowinputmodules typically have a nominal input voltage of3.3, 5, or 12 V. For systems that operate from a tightlyregulated input bus—such as those that do not use batterybackup—a narrow-input module is often adequate sincethe input remains fairly stable.Offering greater flexibility, wide-input modules operatewithin a range of 7 to 36 V, which includes the popular12- or 24-V industrial bus. This enables a single module tobe used for generating multiple voltages. These modulesare ideal for industrial controls, HVAC systems, vehicles,medical instrumentation, and other applications that usea loosely regulated distribution bus. In addition, systemspowered by a rectifier/battery charger with lead-acidbattery backup almost always require wide-input modules.System designers who choose power supplies may wantto take a close look at the latest generation of wide-inputdc/dc modules.
标签: Wide-input modules offer dc
上传时间: 2014-12-24
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