Assessing sustainable energy options: R466A vs. R410A for air conditioning and refrigeration
Bibliographic record
Abstract
The widespread use of R410A is under mounting pressure to gradually phase out due to its high global warming potential (GWP). The Kigali amendment to the Montreal Protocol mandates developed nations to eliminate R410A from air conditioning systems by the late 2020s, necessitating the adoption of alternatives by the mid-2020s. One such alternative, R466A, has emerged as a promising refrigerant mixture with thermodynamic properties that could make it a suitable replacement for R410A. R466A boasts a remarkable 65% reduction in GWP compared to R410A and is classified as non-flammable (Class A1). Previous evaluations in air-cooled chillers and residential split-system heat pumps showed performance mostly in line with expectations, with slight variations in capacity and efficiency compared to R410A. Additional experiments conducted in residential heat pumps and transport refrigeration units further supported R466A's viability as an alternative. Capacities varied by 5% decrease to 2% increase, while efficiencies ranged from 3% decrease to 4% increase compared to R410A. These findings underscore R466A's suitability for various HVAC&R applications, offering both reduced GWP and non-flammability, facilitating its integration into existing equipment designs or as a substitute for R410A in practical use cases.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.005 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".