Performane Of A Modified Drive Mechanism On A Low Temperature Differential Stirling Engine
Bibliographic record
Abstract
Stirling engines are a variety of heat engines which are capable of using heat from various sources including low temperature renewables.This work examines the drive train modifications and performance results of a lab scale low temperature gamma type Stirling engine operating between a source and sink temperature of 94 °C and 5 °C respectively.The drive train was modified to use non-circular gears to dwell the engine piston motion in an effort to improve the thermodynamic work of the engine cycle.A variety of dwelling piston configurations were tested, both for the engine displacer and power pistons.Results indicate that dwelling the displacer piston reduced the engine power output by up to 27% when compared to the conventional drive mechanism, while dwelling the power piston had negligible impact on power output.Gearing the displacer piston to have shorter dwell times with slower displacement speeds did result in faster running speeds at lower engine loads, with a minor 4% improvement to maximum engine power in the best configuration.
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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 | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".