Publication: Development of programmable logic controller based energy management system
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Date
2010-04-01
Authors
Saw, Cheng Ling
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Abstract
Energy management is an approach to reduce wastage due to inefficient use of energy in view of the stiffer energy challenge in decades to come. The Programmable Logic Controller (PLC) based Energy Management System is a collection of hardware and software components for the purpose of reducing energy wastage due to manual operation. Automated controls are carried out with a OMRON CQM1H-CPU51 PLC as the controller unit. Sensors are used to aid the controller in decision making by collecting status. In addition, features such as scheduling offers higher flexibility to the system operation in reducing energy consumption in buildings without sacrificing comfort. Data logging provides chances for building behavior analysis and trend study. A Graphic User Interface (GUI) developed with LabVIEW 6.1 offers an interactive yet simple controls way of control. The system is designed on a centralized control basis, with a host Personal Computer (PC) running the GUI. The project demonstrated the application of lights switching and fan speed manipulation based on illumination level, temperature, and occupancy. This project is a demonstration and preliminary study of future implementation of EMS in USM library building. It is expected to bring significant saving in utility bills when fully implemented.