电气工程及其自动化专业2014届毕业设计论文.docx

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；Based on the PLC intelligent water heaterAbstractThis subject mainly research the programmable controller (PLC) in the application of solar water heater.And solar water heater is described in detail the working principle, working process and system requirements.Focuses on the system hardware structure and software design.Topic by choosing through optical detector to detect light intensity to determine the circulation pump start-up or not, the use of temperature sensors detect the temperature of the collector to achieve anti-freezing control, using the water level sensor detection in the hot water tank water level to realize water level control, using the pressure sensor detect the pressure value at the ends of pipe and through the inverter control of pump operation to realize pressure control, temperature sensors to control the temperature of boiler start-up at the ends of pipe to realize the heating control.By using PLC for the transformation of solar energy, has been basically achieved the various system control requirements, the use of other components, greatly reduces the system to make the system wiring is simple, convenient maintenance and improve reliability, enhance the advanced nature of the system, and greatly reduces the manufacturing cost, can make more users to use the solar water heater.Keywords: PLC;Solar energy;The water heater 目录摘要……...……………………………………………………………………..1Abstract………………………………………………………………………….4第一章 绪 论……...…………………………………………………………..51.1选题的目的和意义.......................................................51.2国内外研究现状..........................................................5 1.2.1国内研究现状.....................