Experimental assessment of HC-290 as a drop-in substitute to HCFC-22 in a split air conditioner.
Bibliographic record
Abstract
A widely used refrigerant in split air conditioning units, the HCFC-22 has to be phased out by 2030 in all Article 5 countries under the Montreal Protocol. Propane (HC-290) is an alternative for HCFC-22. A 5.25 kW Split air conditioner without liquid receiver designed for HCFC-22 was retrofitted with HC-290 and tested under DT, ETA, ETB condition. Under drop-in tests, 4 suction line lengths viz: 12.37m, 19.1m, 23.75m, 30.1m were considered. Considering safety norms & density of HC-290 the charge quantity for HC-290 was taken to be 50% of the original HCFC-22 charge. The results show that as the suction line length increases ,the refrigeration capacity of propane reduces by 18.6% for lower operating conditions and 10.0% for the higher operating condition. The power consumption with HC-290 was lower by 4.28%. The COP with HC-290 was 17.8% higher for the lower operating conditions and 10.96% higher for the higher operating condition.
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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 | 0.001 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".