Honeywell tests potential long-term R410A replacement

USA: Following the announcement of R466A, an alternative for R410A, its now been revealed that Honeywell is working on a further non-flammable R410A replacement refrigerant with an even lower GWP.

Speaking at the 18th European Conference on refrigeration and air conditioning technologies in Milan, Jean de Bernardi, Honeywell’s European technical manager, revealed the results of performance tests using R466A and a new Honeywell development refrigerant, HDR147, in a reversible heat pump system. 

Honeywell created huge interest last year when it announced the introduction of R466A, a blend of R32, R125 and a new component, CF3I. In addition to claims of being non-flammable, its GWP is around 733, a considerable improvement on R410A.

The latest gas under investigation, HDR147, is yet to be assessed by ASHRAE, but is said to have GWP of around 400, and may be a long-term replacement for R410A. Like R466A, it includes CF3I but the other components have not been revealed.



The analysis was performed at typical air conditioning conditions using thermodynamic data from NIST database REFPROP 9.1. The table, above, shows the results of this analysis at ambient temperature of 35°C. 
 

Theoretical performance tests showed that the development gas, HDR147, may have a capacity within 7% of R410A and a 2% higher efficiency. R466A shows a close match in performance to R410A, with capacity within 1% and a 2% higher efficiency than R410A.

Both refrigerants had lower suction and discharge pressures than R410A, while the compression ratios were very similar to R410A. Discharge temperatures for R466A is about 8°C and HDR147 about 11°C higher than R410A. Theoretical results show that both R466A and HDR147 may have slightly higher mass flow rate than R410A by 5% and 8% respectively.

Tests in a 3 ton R410A residential ducted split heat pump system are said to have indicated that both R466A and HDR147 can match the performance of R410A without significant system modification. Neither, however, are a retrofit option. 

Significantly, both are also said to have shown more than 5% efficiency improvements at higher ambient temperatures compared to R410A.

Related stories:

Promising results for R466A in VRF air con tests – 10 January 2019
USA: Toshiba Carrier is said to have described R466A, Honeywell’s new non-flammable R410A replacement, as “promising” after initial performance testing in a VRF air conditioning system. Read more…

R466A has close performance to R410A – 14 October 2018
GERMANY: Solstice N41, Honeywell’s new non-flammable lower GWP refrigerant, is said to have performance characteristics close to R410A. Read more…

Honeywell’s N41 – a blast from the past – 24 August 2018
CF3I is, seemingly, the unknown quantity in Solstice N41, Honeywell’s new R410A replacement refrigerant. But the records show that far from being new to the refrigerants business, it has been considered as a component in replacements for CFCs, HCFCs as well as HFCs in tests dating back at least 30 years. Could the earlier adoption of CF3I have saved the industry a number of system changes along the way? Read more…

Secret of Honeywell’s new refrigerant – 27 June 2018
USA: Honeywell’s development of a non-flammable low GWP alternative to R410A has created huge interest, but what’s in it? The Cooling Post may have the answer. Read more…

Honeywell announces R410A breakthrough – 26 June 2018
USA: Honeywell has announced the development of a new lower GWP non-flammable alternative to R410A in stationary air conditioning systems. Read more…

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