What is the best refrigerant for a heat pump?

Key takeaways:

• Many different refrigerants are available for heat pumps, but the best are natural refrigerants
• The best refrigerants on the market have low Global Warming Potential (GWP) and no o-zone depleting properties
• Aira uses the sustainable and natural R290 refrigerant (propane) for its low GWP and standout efficiency

Heat pumps are an efficient way to heat your home. However, the refrigerant inside your heat pump significantly affects its performance and environmental impact. Refrigerants are the unsung heroes, enabling heat pumps to efficiently transfer heat by cycling through evaporation, compression, condensation, and expansion. Choosing a heat pump with the right refrigerant enhances its efficiency and reduces your carbon footprint.

Understanding refrigerant types

Modern refrigerants aim to balance performance with environmental considerations. Key options include:

• R290 (Propane): A standout natural refrigerant with an ultra-low Global Warming Potential (GWP) of 3, zero ozone depletion potential, and excellent efficiency. These exceptional qualities are why Aira has chose R290 as the refrigerant for our heat pumps.
• R410A: A synthetic refrigerant with a GWP of 2,088, offering solid performance but a far greater environmental impact.
• R744 (CO₂): Known for its near-zero GWP (1), R744 performs exceptionally well in systems requiring large temperature differentials.
• R32: An HFC refrigerant with a moderate GWP of 675, offering higher efficiency than R410A and reduced climate impact.

Environmental considerations

Refrigerant leakage is a significant contributor to greenhouse gas emissions, highlighting the need for low-GWP alternatives. GWP measures how much heat a refrigerant traps in the atmosphere compared to carbon dioxide. Natural refrigerants like R290 and R744 are highly favoured due to their negligible GWP and zero ozone depletion potential. Regulatory bodies, such as the European Union, are phasing out refrigerants with GWPs above 150, accelerating the shift toward sustainable options.

Efficiency & performance

Natural refrigerants, particularly Aira’s choice R290, excel in energy efficiency and environmental sustainability. The Aira Heat Pump achieves a Seasonal Coefficient of Performance (SCOP) of 4.7 at 35°C. This means it produces 4.36 kWh of heat for every 1 kWh of electricity consumed, outshining traditional heating systems.

Conclusion

Heat pump refrigerants are crucial to achieving a sustainable, efficient heating system. By opting for low-GWP options like R290, homeowners can reduce energy bills, minimise environmental impact, and align with global efforts to combat climate change. With advancements in technology, heat pumps equipped with the right refrigerants deliver comfort and conscience-friendly heating solutions.