Experimental Investigation of Refrigeration System Performance Using Nano-refrigerants and Phase Change Material Condensers

Abstract

The increasing demand for energy-efficient and environmentally sustainable refrigeration systems has led to the exploration of advanced heat transfer enhancement techniques. This study presents an experimental investigation of a vapor compression refrigeration system employing nanoparticle-enhanced refrigerants (nano-refrigerants) in combination with a phase change material (PCM) integrated condenser. The primary objective is to evaluate the improvement in thermal performance and energy efficiency of the system. In this work, nanoparticles are dispersed into a conventional refrigerant to enhance its thermophysical properties, including thermal conductivity, heat transfer coefficient, and overall heat exchange capability. The improved properties of the nano-refrigerant facilitate better heat absorption and rejection during the refrigeration cycle. Simultaneously, a PCM-based condenser is incorporated into the system to store excess thermal energy during peak operation and release it during off-peak periods, thereby stabilizing the condenser temperature and improving system reliability. The performance of the system is experimentally analyzed under various operating conditions by measuring key parameters such as coefficient of performance (COP), compressor work, and heat transfer rate. The results demonstrate that the combined application of nano-refrigerants and PCM significantly enhances the COP while reducing energy consumption and compressor workload. Additionally, the PCM integration contributes to improved temperature regulation and reduced thermal fluctuations in the condenser. Overall, this hybrid approach offers a promising and energy-efficient solution for modern refrigeration systems, with potential applications in domestic, commercial, and industrial cooling technologies.

Introduction

Conventional refrigeration systems (commonly using R134a) face issues like high energy use, low efficiency, and environmental concerns. To address this, the study investigates two enhancement methods: adding Al?O? nanoparticles to the refrigerant (nano-refrigerant) and integrating paraffin wax PCM into the condenser for thermal energy storage and better heat management.

An experimental setup was developed where a modified VCR system was tested under three conditions: (1) pure R134a, (2) R134a with nanoparticles, and (3) nano-refrigerant with PCM-integrated condenser. Measurements of temperature, pressure, and compressor power were recorded, and performance was evaluated using COP, heat transfer rate, and energy consumption.

The results show that nano-refrigerants significantly improve thermal conductivity and heat transfer, increasing COP by 10–20%. When combined with PCM, an additional 5–10% improvement in COP is achieved due to better thermal stability and reduced condenser load. Overall, the hybrid approach improves efficiency, reduces compressor work, and enhances system stability.

A sample dataset from experiments (using different temperatures, pressures, and power readings over time) is also presented to analyze system performance under varying operating conditions.

Conclusion

This experimental investigation demonstrates the effectiveness of combining nanoparticle-enhanced refrigerants with phase change material (PCM)-integrated condensers in improving the performance of a vapor compression refrigeration system. The results clearly indicate that the addition of nanoparticles enhances the thermophysical properties of the refrigerant, leading to improved heat transfer characteristics and better system efficiency. The integration of PCM within the condenser further contributes to performance enhancement by acting as a thermal energy storage medium. It absorbs excess heat during peak operation and releases it gradually, which helps in maintaining stable condenser temperatures and reducing thermal fluctuations in the system. As a result, the combined system shows a noticeable improvement in the coefficient of performance (COP), reduced compressor power consumption, and overall better energy utilization. Overall, the hybrid approach provides a significant improvement over conventional refrigeration systems in terms of efficiency, stability, and sustainability. This study confirms that the simultaneous use of nano-refrigerants and PCM is a promising solution for next-generation energy-efficient refrigeration technologies.

References

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Copyright

Copyright © 2026 Mohd Ahamad. 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.