Major Energy and Carbon Savings Achieved Through Refrigeration Upgrades at DHL Wetherspoon Distribution Center

Major Energy and Carbon Savings Achieved at DHL Wetherspoon Distribution Center

In a significant stride towards improved energy efficiency and sustainability, Star Refrigeration has successfully upgraded the frozen storage refrigeration system at the J D Wetherspoon distribution center managed by DHL in Daventry, UK. This ambitious project has resulted in remarkable energy savings that far exceed initial projections.

The centerpiece of this initiative is the new Azanefreezer 2.0, a low-charge ammonia refrigeration system that promises both cost reduction and lower carbon emissions. After installation, the system is expected to cut annual electricity use by over 600,000 kWh, leading to a financial benefit of nearly £200,000 each year while simultaneously reducing carbon emissions by 123 tonnes.

Background and Context

The partnership between Star Refrigeration and DHL represents a commitment to drive energy efficiency within the logistics industry. Faced with the challenges of a 20-year-old refrigeration system that incurred rising maintenance costs, DHL sought a modern solution that aligns with both the company’s operational needs and sustainability goals. Through thorough technical and financial evaluations, Star showcased the limitations of the existing system and proposed the innovative Azanefreezer 2.0 as a viable upgrade.

With rising pressures around reducing carbon footprints and environmental responsibilities, this project represents not just a technical upgrade but a sustainable pathway for cold chain operators. Star's analysis highlighted that maintaining the old refrigeration plant would result in cumulative expenses of around £580,000 over the next three years, whereas the new system would not only eliminate water usage concerns but also offer advanced control capabilities and improved safety features through its significantly lower ammonia charge of just 220 kg.

Implementation of the Upgrade

The newly designed 290 kW Azanefreezer system was strategically implemented to work in tandem with an existing 120 kW Azanefreezer 1.0, which was already part of DHL's infrastructure since 2016. This integration ensures that the facility's 31,000 m³ frozen storage area benefits from a robust and reliable refrigeration solution.

To ensure minimal disruption during the transition, Star Refrigeration executed a phased decommissioning of the older unit during the winter months, ensuring uninterrupted operations throughout the installation period. Since this upgrade, the site has notably exceeded the UK’s best practice standards for facilities of similar size, recording an impressive 17% improvement in energy efficiency compared to existing benchmarks.

Performance Insights and Sustainability Impact

DHL has confirmed the effectiveness of this upgrade through extensive data analysis conducted by Daniel Johnson, Engineering Manager at DHL, who stated, "We have analyzed the electricity figures before and after the installation, and the results speak for themselves; the new system saves, on average, around 617,000 kWh per year. This has produced significant reductions in energy costs and helped us surpass industry efficiency standards."

In addition to the energy savings, the operational oversight of the facility has been bolstered with Star’s Ethos technology, which encompasses an AI-driven digital optimization system. This technology enables real-time performance monitoring, predictive analytics, and continuous system benchmarking. Remote management capabilities are further enhanced through a dedicated team from Star Refrigeration, ensuring optimal functionality at all times.

This collaborative effort underlines the prominence of strong partnerships in fostering innovative engineering and sustainable practices within the industrial refrigeration sector.

Conclusion

With more than 18 months of operational data validating the system's efficiency, the facility is now hailed as one of the most energy-efficient cold storage locations in the UK—a testament to how intelligent engineering and sustainability can walk hand in hand. Management at DHL, alongside Star Refrigeration, showcases a forward-thinking approach that other firms in the industry may look to emulate, emphasizing cost reductions paired with environmental responsibility.

For more details about this project, please visit the DHL / J D Wetherspoon refrigeration project case study.