Flammable refrigerants: what are they, and why should you care?

A growing awareness gap

Heating, ventilation, air conditioning and refrigeration (HVAC) are integral to modern life, maintaining our comfort and safety in many environments. However, the industry is undergoing a significant shift. Environmental concerns, particularly global warming and ozone depletion are driving a transition from traditional refrigerants to more eco-friendly alternatives. These new options, while better for the planet, introduce new challenges – notably, flammability.

In New Zealand, there's a growing awareness gap about the implications of this change. The industry faces several hurdles, including the phasing out of current refrigerants.

One critical aspect is selecting and managing the refrigerants used in HVAC systems. Building owners need to understand what these refrigerants are, their benefits, and the implications for building safety and system performance.

What are flammable refrigerants?

Refrigerants are vital substances that absorb and release heat, enabling HVAC (Heating, Ventilation and Airconditioning) systems to cool or heat spaces effectively.

They are a class of refrigerants that can ignite under certain conditions. These substances are categorised by their flammability levels, ranging from mildly flammable (A2L) to highly flammable (A3). Common examples include hydrocarbons like propane (R-290) and isobutane (R-600a), as well as some hydrofluoroolefins (HFOs).

A growing shift towards flammable refrigerants.

In recent years, there has been a growing shift towards the use of flammable refrigerants:

1. Improved System Performance: Flammable refrigerants, particularly hydrocarbons and HFOs, are not only environmentally friendly but also offer enhanced system performance. These refrigerants have superior thermodynamic properties, which can lead to improved energy efficiency and cooling capacity of HVAC systems. This means that systems using flammable refrigerants can achieve the desired temperatures more quickly and use less energy in the process, resulting in lower operational costs and reduced energy consumption over time.
2. Environmental Responsibility: Flammable refrigerants provide a more sustainable option for HVAC systems due to their lower global warming potential (GWP). By choosing refrigerants that are less harmful to the environment, building owners can reduce their carbon footprint and demonstrate a commitment to sustainability. This proactive approach can improve a building’s marketability, attracting environmentally conscious tenants and investors, and potentially qualifying the property for green certifications or incentives. In a report from Australia, providing air conditioning systems with low operational costs has been linked to increased rental returns and reduce turnover of tenants.
3. Economic Considerations: While the adoption of flammable refrigerants may require additional safety measures, such as enhanced ventilation, gas detectors, and fire suppression systems, these initial investments can be offset by the long-term savings from improved system performance and reduced energy costs. Additionally, using environmentally friendly refrigerants may provide access to incentives or rebates from governmental and environmental organisations, further enhancing the economic benefits.