Validation and conceptualization of thermal zones: A new method of efficiently utilizing borehole thermal energy storage systems
Bibliographic record
Abstract
• Experimental and numerical comparison of single-zone and two-zone BTES field. • Zonal operation requires less high-quality heat while maintaining an increased thermal efficiency. • Reduced thermal losses from the sides of the BTES volume with zonal operation. • Exergy efficiency improvements with zonal operation. This study presents the results of an investigation into the thermal losses from borehole thermal energy storage fields. The objective of this work is to explore a novel two zone borehole thermal energy storage field and evaluate the thermal losses and both energy and exergy efficiencies in comparison to the typical single-zone series arrangement. The methodology includes experimental and numerical investigation, with experimental results used to validate three dimensional models of the borehole field. The numerical models are used to further explore the concept of multi-zone borehole fields, quantifying energy and exergy losses through the top, sides, and bottom boundaries. The results showed that operating a two-zone borehole field, with a concentric radial second zone operating at a lower inlet temperature, maintains the quality of the injected heat in the center zone. The two-zone operation also required less high-quality heat while maintaining an increased thermal efficiency. The energy efficiency of the two-zone field increased to 81 % whereas the typical single zone series arrangement borehole field saw an efficiency of 60 %. Advantages were also seen for the two-zone borehole field with an exergy efficiency of 13 %, compared to the 6 % exergy efficiency of the typical borehole field. These implications of these findings highlight the reduction in required high quality heat when charging a zonal borehole field. The results also highlight the need to explore independent operation of concentric zones within borehole thermal energy storage fields with focus on maintaining the storage temperature quality.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| 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".