Design and Implementation of a PLC-Based Multi-Evaporator Temperature Control System for Cold Storage Applications

Abstract

The paper aims to the design, implementation, and evaluation of a PLC-based temperature control system for a multi evaporator cold storage store. The system was developed to manage three independent storage rooms dedicated to meat, fish, and chicken each requiring separate temperature ranges. By employing Siemens S7-1200 PLCs, PT100 sensors, and solenoid valves, the system achieves precise temperature regulation through individual PID control loops. The project included comprehensive hardware integration, software development using TIA Portal, and rigorous field testing. Results indicate that the system-maintained temperature set points within ±0.5°C, reduced energy consumption by approximately 18%, and achieved 99.5% uptime over three months. The system's modular design, advanced control logic, and user-friendly HMI interface demonstrate the effectiveness of PLCs in improving efficiency, reliability, and flexibility in cold storage environments. Recommendations are provided for future enhancements, including IoT integration and predictive maintenance features, to further elevate system performance and sustainability.