基于PLC_的中央空调控制系统设计.docVIP

基于PLC的中央空调控制系统设计 中央空调现已广泛的应用在各大商场、办公大厦等场所中，传统控制系统中在控制较适宜的温度的同时，却消耗了大量的能量。如今，人们越来越重视中央空调的舒适性和节能性，本文重点研究了中央空调冷冻泵机组控制系统，为舒适的生活工作环境及有效节能提供了技术条件。 本文首先介绍了中央空调的结构和工作原理，总结了传统中央空调的缺点，即冷冻泵、冷却泵不能自我调节负载，长期处于满负荷运行，造成了极大的能源浪费，随着变频技术日趋成熟，利用变频器、PLC、数模转换模块、温度传感器等器件的有机结合，构成温差闭环自动控制系统，自动调节水泵的输出流量达到节能目的。该系统采用的作为主控制单元，通过变频器控制水泵运转速度，保证系统根据实际负荷的情况调整流量，实现恒温控制，同时又可以节约大量能源。关键词中央空调；；变频器； Abstract Central air conditioning has been widely used in major shopping malls, office buildings and other places, the traditional control system in the control of suitable temperature at the same time, it consumes a lot of energy. Nowadays, people pay more and more attention to central air conditioning comfort and energy efficiency, this paper focuses on the research of central air conditioning refrigeration pump unit control system, for comfortable living and working environment and effective energy-saving provide technical conditions. This paper introduces the structure and working principle of central air conditioning, summarizes the traditional central air-conditioning system shortcomings, namely refrigeration pump, cooling pump can not self regulation in long-term load, full load operation, causing great waste of energy, along with the frequency conversion technology is mature with each passing day, the use of frequency converter, PLC, digital to analog conversion module, temperature sensors and other devices the organic combination of form, thermoelectric closed-loop automatic control system, automatically adjust the pump output flow to achieve the purpose of energy saving. The system adopts FX2N-64MR as the main control unit, through the FR-F540-37K-CH inverter control pump speed, ensure the system according to the actual load adjusting flow, to achieve constant temperature control, but also can save a lot of energy. Keywords: Central air conditioning; PLC; inverter; temperature sensor 目 录 第1章 绪论 1 1.1 课题来源 1 1.2 课题简介 1 1.3 课题意义及目的 1 1.4 中央空调控制系统的研究现状 2 第2章 中央空调的控制技术 4 2.1 中央空调的简介 4 2.2 中央空调的分类 4 2.