Compressors: At the heart of refrigerant-transition efforts

The Middle East’s high temperatures and growing cooling demands present unique challenges for selecting sustainable refrigerants. The need of the hour is to contribute to this transition by developing advanced technologies designed to meet these specific needs while ensuring safety and promoting energy efficiency and sustainability.

Compressors are crucial components in HVAC systems, enabling refrigerant circulation and ensuring cooling efficiency. As the industry shifts to lower global warming potential (GWP) refrigerants, compressor designs, materials and performance testing have evolved. Compressors must now be more robust and adaptable to handle new refrigerants that possess different chemical properties and performance characteristics.

Innovations for A2L refrigerants

The adoption of mildly flammable A2L refrigerants has led to significant advancements in compressor designs. These innovations include:

• Design adaptations: Compressors now feature sealed motors and reinforced housings to enhance safety and reliability.

• Performance in high temperatures: To handle the Middle East’s extreme heat, compressors are equipped with innovative cooling solutions that enable consistent performance under thermal stress.

Efforts by industry leaders focus on maintaining compressor reliability and safety while ensuring efficiency, ensuring that these essential components continue to meet evolving standards.

The Middle East’s scorching climate increases stress on compressors, requiring tailored engineering solutions. High-ambient temperatures challenge both efficiency and reliability during the refrigerant transition.

Trade-offs in operation

• Efficiency versus durability: Low-GWP (LGWP) refrigerants, while environmentally beneficial, may introduce performance trade-offs under high-ambient conditions. Innovative engineering balances efficiency with long-term reliability.

• Safety considerations: Prolonged exposure to extreme temperatures increases the need for robust safety measures, especially with mildly flammable refrigerants.

• Working envelope: Moving to these low-GWP refrigerants is not a big challenge from the perspective of flammability, as the compressor is not an ignition source. However, these new refrigerants are most of the time posing constraints on the working envelope, both with high temperature and with low evaporating temperatures, making it crucial to select the right refrigerant for the region; Refrigerants like R-32, with limitations on the discharge temperature, need to be revaluated.

• Refrigerant density: Another challenging issue from the compressor perspective, in fact more relevant than being A2L, is that these LGWP refrigerants are moving from high density to lower/very low density. With regards to the internal compressor design, lower density and increased pressure drop cause energy loss, meaning that the compressor’s internal design needs to be adapted.

For such climates, it is important – even essential – to design compressors with a wider operating envelope. Such compressors excel under demanding conditions at high-ambient temperatures. These compressors set new benchmarks for durability and performance.

A2L safety: A compressor perspective

The integration of A2L refrigerants introduces specific safety considerations for compressors due to their mildly flammable nature. This necessitates a careful approach to design and operation.

Key safety considerations include:

• Risk mitigation features: Compressors are being designed with sealed motors and reinforced housings, and are in compliance with international standards (e.g., UL, IEC) to address flammability risks.

• Operational best practices: Safety protocols are crucial to ensure the safe handling and usage of A2L refrigerants in HVAC systems.

Innovative safety measures, supported by industry-wide research and development, help mitigate risks associated with these refrigerants while enhancing their operational reliability.

Challenges in manufacturing

• Retooling for compatibility: Manufacturing facilities are adapting production lines to accommodate LGWP refrigerants, ensuring compatibility with new standards.

• Innovative designs: Selecting materials that comply with new safety standards and higher efficiency components enhances compressor durability and aligns with refrigerant requirements and decarbonisation efforts.

• Qualification of technicians: Educating technicians on safety and design requirements for working with new, often flammable, refrigerants is essential.

Manufacturers across the industry are working to address these challenges, including through innovations aimed at streamlining transitions and maintaining production efficiency.

Industry collaboration

Collaboration among organisations, governments and industry stakeholders is vital for the success of refrigerant transition efforts. Industry associations like the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) promote technical advancements and facilitate knowledge sharing.

Key collaborative efforts:

• Establishing standards: Industry groups work to create global and regional standards for refrigerant safety, efficiency and compatibility.

• Working with authorities: Collaborating with authorities to set up procedures and regulations for a safe and efficient transition is essential.

• Unified goals: Aligning industry strategies ensures that environmental and operational objectives are met comprehensively.

As the chair of AHRI’s Refrigerant Working Group, my responsibility is to help achieve the working group’s objectives and ensure the success of this major transition. Danfoss is an active participant in AHRI’s Working Groups, contributing to shaping standards and fostering collaborative innovation. These efforts support the industry’s shared goals and ensure that the transition to LGWP refrigerants is successful.

Note that the goal is not LGWP. Indeed, LGWP refrigerants are only an enabler for the bigger target, which is decarbonisation. Indeed, as compressor manufacturer, we want to innovate and accelerate decarbonisation based on energy efficiency all year round and life-time extension, combined with the move to LGWP refrigerants.

Enhancing regional cooperation

The refrigerant transition represents a shared challenge for countries across the Middle East. Regional collaboration can amplify progress by pooling resources, sharing expertise and aligning strategic goals. This collaborative spirit, supported by contributions from key stakeholders, strengthens the region’s ability to tackle the challenges of the refrigerant transition effectively.

Paving the way forward

The refrigerant transition in the Middle East represents a pivotal moment for the HVACR industry, presenting challenges as well as opportunities. Compressors, as the core components of cooling systems, are essential to this shift. Their adaptability to high-ambient temperatures, safety in using flammable refrigerants and efficiency determine the success of the transition.

Overcoming challenges, such as high-ambient stresses, flammability risks and manufacturing adaptations require a holistic and collaborative approach. By fostering partnerships, prioritising innovation and maintaining rigorous safety standards, the industry is charting a path towards a low-GWP future. The Middle East’s leadership in this transition serves as an example for other high-ambient temperature (HAT) regions, demonstrating that with the right strategies and collaboration, a sustainable and efficient refrigerant transition is achievable.

The writer is Key Account Senior Advisor, Danfoss – MENA and Chair, AHRI MENA’s Refrigerants Working Group. He may be contacted at <murad@danfoss.com>.