Stockage thermique saisonnier par puits géothermiques pour bâtiments résidentiels équipés de panneaux photovoltaïques-thermiques
Bibliographic record
Abstract
RESUME Les performances energetiques d’un systeme geothermique avec injection de chaleur depuis des panneaux photovoltaiques-thermiques sont evaluees dans le cas d’une maison unifamiliale situee a Montreal. Contrairement aux systemes de pompes a chaleur geothermiques classiques, le ou les puits comportent deux circuits independants. Ainsi, il est possible d’injecter de la chaleur dans les puits depuis les panneaux solaires et d’en extraire a l’aide de la pompe a chaleur de maniere simultanee. Le systeme est tout d’abord analyse pour un seul puits a l’aide de simulations dans l’environnement TRNSYS. Les resultats montrent que l’injection d’energie dans le puits augmente l’efficacite du systeme et limite la reduction de ses performances due au desequilibre des charges au sol. Toutefois, une partie de l’energie injectee durant l’ete est perdue par diffusion thermique vers le sol environnant et un seul puits geothermique n’est pas adapte pour le stockage thermique saisonnier. Le meme systeme est etudie en remplacant le puits geothermique par un champ de puits de faible profondeur. Cette analyse a permis de mettre en evidence la possibilite de realiser un stockage thermique saisonnier de type BTES a l’echelle d’une maison unifamiliale. Le systeme presente alors des performances energetiques superieures a celle du systeme a un puits avec recharge solaire du sol mais occupe un volume de stockage important. Dans le dernier volet de ce memoire, une etude preliminaire d’un systeme comportant un stockage latent sous forme de glace est presentee. Les resultats sont compares a ceux du stockage de type BTES en matiere de performance energetique et de configuration requise. Le stockage de type BTES necessite un volume de stockage important mais presente une efficacite energetique globale elevee. Le systeme avec stockage de glace est constitue d’un volume bien plus faible mais il ne semble pas permettre d’atteindre des performances similaires a celle du BTES, le niveau de temperature a l’entree de la pompe a chaleur etant alors limite par la faible temperature de stockage. Ses performances sont cependant comparables a celle d’un systeme de pompe a chaleur geothermique classique, c’est-a-dire sans recharge solaire du sol.----------ABSTRACT The energy efficiency of a ground-source heat pump system with solar heat injection from photovoltaic-thermal panels is evaluated. The system provides heat to a single-family house located in Montreal. Unlike conventional GSHP systems, the borehole, or boreholes, is equipped with two independent fluid circuits. Thus, it is possible to inject heat from the solar panels and extract energy with the heat pump simultaneously. First, the system is analyzed with a single borehole using numerical simulations within the TRNSYS environment. Results show that the heat injection in the borehole increases the efficiency of the system and limits the reduction in performance caused by unbalanced ground loads. However, part of the heat injected during the summer is lost by thermal diffusion to the ground surrounding the borehole and a single borehole is not appropriate for seasonal thermal energy storage. A study of the same system is performed after replacing the single borehole by a borefield consisting of 15 shallow boreholes. This analysis points out the technical feasibility of seasonal borehole thermal energy storage (BTES) systems for residential applications. Such a system reaches a higher energy efficiency than the system including a single borehole with solar charging but requires a large storage volume. The last part of this thesis presents a preliminary study of an ice storage system. The results are compared to the BTES in terms of energy efficiency and needed configuration. The system with BTES requires a large storage volume but achieves a high overall energy efficiency. The ice storage system involves a much smaller storage volume but does not seem to be able to reach an energy efficiency similar to the BTES, the heat pump inlet temperature being limited by the low storage temperature. However, the overall energy efficiency of this system is similar to conventional GSHP systems, i.e. without solar charging.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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; both teacher heads agree on what is shown here.
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".