Performance evaluation of a magnetic refrigeration system
Bibliographic record
Abstract
This work presents an evaluation of the thermodynamic performance of a magnetic refrigerator prototype developed at the Federal University of Santa Catarina. Experiments were carried out to determine the power consumption of the system as a whole, and of its main components (sub-systems) individually. The transmission powers associated with the system components were computed from the torques required to drive each sub-system at frequencies between 0.2 and 1.6 Hz. Thermodynamic efficiency parameters, namely the coefficient of performance and the second-law efficiency were computed. Maximum values of the coefficient of performance and second-law efficiency of 2.5 and 3.7%, respectively, were obtained at system temperature spans of 4 and 6 K. The maximum zero-span cooling capacity was approximately 150 W. The major limitations to enhancing the system performance were the losses in the flow management sub-system (pumping power and valve losses). Improving the operation of the components in this system would lower their power requirements for a given fluid flow rate, which would increase the overall efficiency of the 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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".