Toshiba evaluated Honeywell's new non-flammable R410A substitute R466A as “promising” after preliminary performance testing of VRF air conditioning system.
Honeywell announced the development of R466A in June last year, which attracted worldwide attention. Honeywell will sell the new Solstice N41 refrigerant, which seems to meet the demand for non-flammable, low GWP R410A alternatives. Previous solutions are R32 and R454B which are mildly flammable A2L gases suitable for residential separation and small commercial installations, but not for large-volume VRF systems. The GWP values of R466A are similar to the alternatives of A2L.
Honeywell said that the efficiency, cooling and heating capabilities of VRF systems using R466A were very similar to those using R410A. The design pressure of R466A is also slightly lower than that of R410A. Its life cycle climate performance, including direct and indirect emissions, shows that emissions from R466A are 30% lower than those from R410A.
In a statement, Toshiba Airlines said: “In order to meet the requirements of Japan's HFC phase-out and support the Kigali Amendment, Toshiba is actively seeking alternatives to the next generation of R410A, which is energy-efficient and safe for our customers and the environment.”
“After the satisfactory preliminary performance test results, we are pleased to see whether Solstice N41 is a non-flammable and safe alternative to R410A, which will help achieve Japan's HCC phase-out target. We have been conducting reliability tests to deal with newly developed refrigerants in VRF systems.”
R466A is a mixture of 49% R32 and 11.5% R125 and flame retardant CF3i.
Compressor manufacturer Bitzer described in its latest refrigerant report the relatively small thermodynamic difference between R410A and R466A. Volume refrigeration capacity, pressure level and discharge temperature are slightly higher, and refrigerant mass flow rate is about 15-20%. The temperature drop is also very low.
Sanjeev Rastogi, Vice President and General Manager of Honeywell Fluorine Products, said: “Toshiba's findings in preliminary tests are a good proof that our Solstice N41 technology, which is non-flammable and reduces GWP value, is ready to address a key issue and will become the next global refrigerant standard.” “Our invention and achievement of Solstice N41 is a real breakthrough, because it provides a near-declining solution for the entire industry, maintaining a level of security throughout the value chain, while providing significant environmental benefits.”
Honeywell expects to receive full approval from ASHRAE this month and get approval as the original equipment manufacturer as early as 2019.