文档介绍：1基于PLC智能热水器摘要本课题主要研究了可编程控制器(PLC)在太阳能热水器中的实际应用。并介绍了太阳能热水器的工作原理、工作过程和系统要求。重点研究了系统硬件构成和软件设计。课题选用通过光辐射探测器判断光照强度来确定循环泵是否启动,利用温度传感器检测集热器的温度从而实现防冻控制,利用水位传感器判断热水箱中的水位高低,利用压力传感器检测管网末端的压力值并通过变频器控制水泵运行,利用温度传感器检测管网末端的温度从而控制锅炉是否启动来实现了加热控制。太阳能通过PLC已经基本实现了系统控制的各个要求,大大减少了系统对其它元器件的使用,从而使系统接线简单、检修方便快捷、可靠性能提高,提高了系统的先进性,很大程度上减少了制造成本,可以使更多的用户方便使用太阳能热水器。关键词:PLC;太阳能;热水器;2BasedonthePLCintelligentwaterheaterAbstractThissubjectmainlyresearchtheprogrammablecontroller(PLC),-upornot,theuseoftemperaturesensorsdetectthetemperatureofthecollectortoachieveanti-freezingcontrol,usingthewaterlevelsensordetectioninthehotwatertankwaterleveltorealizewaterlevelcontrol,usingthepressuresensordetectthepressurevalueattheendsofpipeandthroughtheinvertercontrolofpumpoperationtorealizepressurecontrol,temperaturesensorstocontrolthetemperatureofboilerstart-,hasbeenbasicallyachievedthevarioussystemcontrolrequirements,ponents,greatlyreducesthesystemtomakethesystemwiringissimple,convenientmaintenanceandimprovereliability,enhancetheadvancednatureofthesystem,andgreatlyreducesthemanufacturingcost,:PLC;Solarenergy;Thewaterheater目录摘要……...……………………………………………………………………..1Abstract………………………………………………………………………….4第一章绪论……...…………………………………………………………..............................................................................................................................................................................................................................................................................................................64第二章太阳能热水器的综述............................................................