Study of ammonia screw compressor used in a refrigeration unit a chiller with economizer
Bibliographic record
Abstract
Background: Energy conservation and reduction of negative environmental impact of refrigeration units are relevant when developing new equipment. In this regard, we study the development of an ammonia oil-filled screw compressor for a low-temperature refrigeration cycle with an economizer. Ammonia is a natural refrigerant not subject to the Montreal, Copenhagen, and Kyoto Protocols, and economizers allow to increase the refrigeration coefficient compared to a two-stage cycle. Aim: To propose a method to calculate intermediate pressure at which a refrigeration cycle with an economizer will have the highest refrigeration coefficient. Methods: The refrigeration coefficient is calculated analytically. For this purpose, we developed a plant diagram. For all studied modes, we developed cycles s in enthalpy-pressure diagrams and calculated the refrigeration capacity, power consumption, and the refrigeration coefficient. Results: We determined the correlation of refrigeration coefficient with the intermediate pressure for all studied modes. Conclusion: We developed a method to calculate intermediate pressure at which a a refrigeration cycle with an economizer has the highest performance.
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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 | 0.000 | 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".