Portable PCM Cooling Box with IoT Monitoring for Safe Vaccine and Medicine Transportation

Abstract

The increasing demand for efficient cold-chain management in healthcare, pharmaceutical, and food transportation sectors requires reliable and energy-efficient cooling solutions. Conventional cooling boxes often suffer from poor temperature stability, lack of intelligent monitoring, and limited remote accessibility. To address these challenges, this paper presents the design and implementation of a Smart PCM Cooling Box integrated with Internet of Things (IoT) technology for real-time monitoring and thermal management. The proposed system utilizes Phase Change Material (PCM) for passive thermal energy storage and an ESP32 microcontroller for intelligent control and wireless communication. Temperature and environmental parameters are continuously monitored using sensors, while real-time data are transmitted to cloud platforms through Wi-Fi and Bluetooth communication. The system also incorporates an OLED display, buzzer alerts, and mobile-based monitoring for enhanced user interaction and safety. Experimental analysis was carried out to evaluate temperature stability, sensor accuracy, communication reliability, and power consumption. The results demonstrate that the PCM-based cooling system maintains lower and more stable temperatures compared to conventional cooling methods while consuming minimal power. The developed prototype provides an effective, low-cost, portable, and scalable solution for applications such as vaccine transportation, medical storage, food preservation, and smart cold-chain logistics. The integration of PCM technology with IoT-based monitoring improves operational efficiency, remote accessibility, and thermal performance, making the proposed system suitable for next-generation intelligent cooling applications..

Introduction

The text describes a portable, IoT-enabled cooling system designed to safely transport temperature-sensitive items like medicines, vaccines, and perishable food.

It explains that traditional refrigeration systems and ice-based cooling methods are unreliable because they require continuous power, offer limited cooling duration, and lack real-time temperature monitoring. These issues often lead to spoilage, reduced drug effectiveness, and financial losses.

To solve this, the proposed system uses Phase Change Materials (PCMs) for passive and stable cooling, combined with IoT technology for real-time monitoring. The setup includes an ESP32 microcontroller, temperature sensors (DS18B20), OLED display, alerts (buzzer/LED), and cloud or mobile connectivity for continuous tracking. It operates on rechargeable batteries and can maintain cooling for about 6–12 hours at low cost.

The literature review shows that PCMs improve thermal stability and IoT systems enable monitoring, but most existing solutions are either large-scale, expensive, or lack integration for personal portable use. The key research gap is the absence of a low-cost, portable PCM-based cooling system with integrated IoT monitoring for individual travel and healthcare needs.

The methodology explains a step-by-step system: selecting materials (PCM and insulated box), collecting temperature data using sensors, triggering alerts when temperature crosses safe limits, and continuously monitoring and transmitting data via Wi-Fi or Bluetooth.

Conclusion

The Smart PCM Cooling Box successfully demonstrates an intelligent and energy?efficient solution for maintaining temperature?sensitive products during storage and transportation. By integrating PCM technology with IoT monitoring, the system addresses limitations of conventional cooling methods [1], [2], [3]. The experimental methodology involved the implementation of temperature sensors, RTC module, OLED display, alert system, and wireless communication using Wi-Fi and Bluetooth. Experimental results confirmed that the PCM cooling box maintained lower and more stable temperatures compared to traditional cooling methods. The sensor readings showed high accuracy with minimal error, while the IoT communication system enabled real-time cloud monitoring and instant alert notifications during abnormal conditions. The system also demonstrated low power consumption, making it suitable for portable and battery-operated applications. The novelty of this research lies in combining PCM-based passive cooling with IoT-enabled intelligent monitoring in a compact and low-cost architecture. The innovation includes remote temperature tracking, smart alert generation, cloud data storage, and efficient thermal management for healthcare and food preservation applications. Overall, the developed system provides a reliable, portable, and scalable cooling solution suitable for vaccine transportation, pharmaceutical storage, medical logistics, and cold-chain applications. Future improvements may include solar power integration, AI-based predictive monitoring, and advanced cloud analytics for enhanced performance and automation.

References

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Copyright

Copyright © 2026 Amol More, Tanvi Pawar, Jivan Pagadle, Harshavardhan Lodhe, Mahesh Darade, Dipshika Chavhan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.