基于PLC的空气源热泵热水器的控制系统设计 毕业论文 定稿.doc

智能加热控制系统 ——基于PLC的空气源热泵热水器的控制系统设计 摘要 环境问题和能源问题已成为制约国民经济发展的两大难题。近些年来，空气源热泵热水系统因其节能、环保等显著特点而越来越受到广大消费者的关注。PLC也因其可靠性高、控制功能强等优势逐渐在控制领域占据着举足轻重的地位。而一个热泵热水器如果没有好的控制系统，将会产生不必要的材料浪费和环境污染。所以本课题基于PLC的空气源热泵热水器的控制系统设计，就是要结合二者的特点使热泵的优势和效能得到最大程度的体现，从而达到缓解环境和能源问题的目的。 基于电机的功耗与其转速的立方成正比关系，所以本设计还用到了变频器，充分结合了系统的特点，同时也达到了节能的目的。 在控制领域，PID调节以其结构简单、稳定性好、工作可靠、调整方便成为工业控制的主要技术之一 本设计完成的是PLC控制中的下位机部分，实现了整个水箱水的一个加热全过程。并结合变频器和PID调节达到节能的目的。 关键字：PLC;变频器;PID调节  INTELLIGENT HEATING CONTROL SYSTEM --PLC-BASED AIR SOURCE HEAT PUMP WATER HEATER CONTROL SYSTEM ABSTRACT Environmental issues and energy issues have become the two major problems restricting the development of the national economy. In recent years, the air source heat pump hot water system because of its remarkable characteristics such as energy-saving, environmental protection, which has attracted the attention of consumers. PLC also holds an important position in control field for its high reliability and strong control function. And if a heat pump water heater has not a good control system, it will generate unnecessary material waste and environmental pollution. So this topic based on PLC, air source heat pump water heater control system design, is to combine the characteristics of them to make the advantages and efficiency heat get maximum embodiment, to achieve the mitigation of environmental and energy purposes. Based on motor power is proportional to the cube of its speed, so the design also uses a frequency converter, is combined with the characteristics of the system, but also to achieve energy-saving purposes. In the field of control PID regulator for its simple structure, stable, reliable, and convenient adjustment of industrial control has become one of the main technology. This also comes with a PLC PID regulation module to regulate the motor speed, this not only ensures a reasonable water supply, but also reduces the system power consumption. This design has completed the PLC programming control part, achieved a whole tank wate