Performance of R466A, a non-flammable replacement for R410A, in unitary air-conditioning and transport refrigeration.
Bibliographic record
Abstract
Use of R410A is under pressure to be phased down because of its high global warming potential (GWP). The recent Kigali amendment to the Montreal Protocol will necessitate the phase-out of R410A used in air conditioning systems in developed countries by the late 2020s. This will require the industry to begin using R410A replacements by the middle 2020s. A new refrigerant blend, R466A, has been developed with thermodynamic properties that potentially make it a design compatible replacement for R410A. This new blend offers a 65 % reduction in GWP over R410A and is non-flammable (Class A1). Tests of a blend with very similar composition in an air-cooled chiller and a residential split system heat pump were previously reported. Performance generally met expectations with capacity being slightly lower than R410A and efficiency being slightly lower than R410A in the chiller test and similar to positive in the heat pump test, all consistent with the thermodynamic properties of R466A relative R410A. This paper presents the results of tests run with R410A (as baseline) and R466A in another residential heat pump and a transport refrigeration unit. Again, performance is generally seen to meet expectations. Capacities ranged from -5 % to +2 % relative to the R410A baselines. Efficiencies ranged from -3 % to +4 % relative to the R410A baselines. These results demonstrate R466A's utility as a lower GWP, design compatible replacement for R410A in a range of HVAC&R equipment. Its classification as non-flammable permits R466A to be used in existing equipment designs, either in new product or as field replacement of reclaimed R410A.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".