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not only is the refrigerant’s GWP as low as possible, and the charge as small as possible, but – critically – that equipment is as energy efficient as possible. This is the approach that Carrier adopted in optimising the design of its AquaSnap chillers and heat pumps to operate on R-32. It required going back to the drawing board to

ensure systems were fully optimised at every stage in the thermodynamic cycle, with careful component selection and testing to ensure the best possible match for the unique properties of the refrigerant The good news is that, due to its operating

characteristics, R-32 is up to 10% more efficient than R-410A. And its carbon-equivalent emission rating is 68% lower. Delivering this theoretical advantage to the greatest possible extent, however, requires careful system design and optimisation. For example, scroll compressors used on Carrier

chillers are designed specifically for use with R-32. Due to improvements in engineering and design, they operate at maximum efficiency at minimum and part load conditions. This results in a significant improvement in overall energy efficiency and lower operating costs. Further efficiency improvements are made possible by the use of the latest second generation V-shape Novation micro-channel heat exchangers.

Exclusive to Carrier, these all-aluminium components are not only highly efficient in transferring heat but help reduce refrigerant charge by 40% versus standard copper / aluminium coils. The heat exchangers are paired with the latest high performance 6th generation Flying Bird fans, which have a new multi-blade design for improved aerodynamic performance. Accurate load matching is assisted by the use of variable-speed condenser fans and pumps. Brazed plate heat exchangers with asymmetric channels are used not only for their efficiency but to reduce pressure drop and minimise the risk of fouling on the water side. Their true dual-circuit design also assists performance in both full and part-load conditions. To provide enhanced resilience, chillers use

multiple stage compressors operating in two independent refrigeration circuits. This enables them to continue operating in the unlikely event of a compressor failing. It also limits the risk of refrigerant leakage in the case of accidental damage. Overall, as a result of system design improvements

and careful component selection, the refrigerant carbon footprint of our commercial scroll chillers and heat pumps operating on R-32 has been reduced by up to 80%. This reflects the refrigerant’s lower GWP

and reduction in charge compared to the previous generation using R-410A. In terms of energy efficiency, the chillers achieve an outstanding Seasonal Energy Efficiency Ratio (SEER 12/7) of up to 5.33 for cooling, and a Seasonal Coefficient of Performance (SCOP) of up to 3.77 for heating. This exceeds Ecodesign 2021 requirements by some 20%. As a result, use of Carrier R-32 chillers and heat pumps attracts two BREEAM points when installed in environmentally assessed buildings. This enables end users to achieve the highest environmental standards in use today. In summary, Carrier has gone back to the drawing

board and taken time to research and test how best to harness the properties of this new refrigerant, and developed fully optimised systems that deliver the best possible performance. The result is one of the most energy efficient and

reliable ranges of R32-based chillers and heat pumps available. AquaSnap units save energy, cut running costs, reduce building carbon emissions, help protect the environment and, due to their resilience, ensure continuity of cooling for buildings and critical process applications. And they are available in capacities from 40 to 940kW (up to 550kW for heat pumps), which we believe is the widest Eurovent-certified range currently on the market.

April 2021


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