Non-Flammable R-410A Alternative for Commercial Refrigeration and Air Conditioning
Bibliographic record
Abstract
It is well known that R-410A is the predominant refrigerant used globally in air conditioning systems. However, there has recently been growing interest in 410A use in commercial refrigeration applications in Japan. Along with the Kigali amendment to the Montreal Protocol to phase down use of HFCs, Japan has enacted HFC regulations with specific GWP limits. For commercial condensing units and larger refrigeration systems, a GWP limit of < 1500 GWP will be implemented starting in 2025. To address the need for a lower GWP R-410A alternative, a nonflammable hydrofluoroolefin (HFO) refrigerant mixture with named XP41 (R-463A pending) has been developed. XP41 is a five-component mixture of HFO-1234yf using HFC-32, 125, and 134a and a small amount of CO2. HFO-1234yf is included in the formulation to reduce the GWP. HFC-32 and CO2 have been added to increase the cooling capacity and provide comparable performance to R-410A. For large building air conditioning where variable refrigerant flow (VRF) use is growing, there is also a significant challenge to safely use flammable refrigerants due to large charge sizes. XP41 could potentially address this need as well This paper will provide detailed information on the properties and other key characteristics of XP41, including drop-in testing in an air conditioning system.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.003 |
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".