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 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) | 0.001 | 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".