การลดความสูญเปล่าทางพลังงานของเครื่องทำความเย็นตามแนวทางของลีน กรณีศึกษา กระบวนการผลิตสารเคลือบกระป๋องชนิดโลหะ

Nivat Jantokul; Lerdlekha  Sriratana

Authors

Nivat Jantokul Engineering Management and Technology Program, Faculty of Engineering, Ramkhamhaeng University No. 2086, Ramkhamhaeng, Hua Mak, Bang Kapi, Bangkok, 10240
Lerdlekha Sriratana Engineering Management and Technology Program, Faculty of Engineering, Ramkhamhaeng University No. 2086, Ramkhamhaeng, Hua Mak, Bang Kapi, Bangkok, 10240

Keywords:

Lean, Chiller, Energy Waste, Internet of Things (IoT)

Abstract

This research aims to analyze the causes of energy waste in a refrigeration system (chiller) used in the metal can coating production process at a packaging manufacturing company. The chiller system was identified as the highest energy–consuming system in the production process, with an average electricity consumption of 16,042 kWh per month. The study identified two primary causes of energy waste: operating the system in standby mode and setting the chilled water temperature below the requirement, resulting in excessive energy consumption (over–supply). Based on these findings, four improvement measures were implemented: (1) increasing the chilled water temperature from 10 °C to 14 °C to better match the actual cooling load, (2) reducing the number of operating compressors from three units to two units, (3) establishing standard operating procedures (SOP), work instructions (WI), and user training programs, and (4) installing an Internet of Things (IoT) system to measure and monitor energy consumption in real time. The implementation results during January–March 2026 showed that the average electricity consumption decreased to 12,085 kWh per month, representing a reduction of 24.6%, without affecting the quality of the coating product. This resulted in an estimated annual energy cost saving of approximately 227,923 THB. In addition, employees became more involved in promoting efficient energy use practices.

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