Performance of a district heating substation in low temperature district heating
Bibliographic record
Abstract
The object of this study was to examine, what is the performance of the district heating substation in low temperature district heating. One of the Alfa Laval’s plate heat exchanger was studied with Anytime-program. Supply and return temperatures and flow rates were changed. The aim of the study was to examine, if it is possible to use a heat exchanger, that is sized based on today’s sizing parameters, in low temperature district heating and how to control the substation. \nThe outcome was, that it is not possible to only change the district heating supply temperature without changing the control methods of the substation. When the secondary side return temperature was decreased by lowering the flow rate and regulating the supply temperature according the control curve, it was possible to lower the district heating supply temperature by 10 °C, whit out too high return temperature in primary side. The secondary flow rate can be adjusted by lowering the pumps rotational speed. By lowering the secondary flow rate, it is possible to decrease the district heating supply temperature.
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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 | 0.000 |
| 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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 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".