Notice bibliographique
Résumé
The object of this investigation was to examine the transient heat flow through a composite wall. This wall was chosen to represent the type used in house construction. It consisted of a fir frame, covered on one side with hardboard and on the other with cedar, and the space between the hardboard and cedar was filled with fibreglass insulation. A vapour barrier was not included as it would offer little resistance to heat flow. This structure, therefore, offered resistances to heat flow in series and parallel. The theoretical analysis was numerical owing to the anisotropic properties of the materials and to the composite structure of the wall. Two analyses were made of the transient heat flow, an exact analysis and an approximate analysis which neglected the effect of the frame. The heat flow was three dimensional in the first analysis owing to the difference in the magnitude of the parallel resistances and was one dimensional in the approximate analysis. The two theoretical solutions both showed exponential cooling rates and agreed within five percent of each other, which shows that the effect of the frame is negligible when its surface area is small as compared to the total surface area of the wall. The ratio of total wall surface area to frame area for the wall studied was 9.6 to 1.0. The wall was mounted in a guarded hot-box apparatus and experiments were performed in order to verify the results of the theoretical analysis. The experiments consisted of establishing a steady state temperature gradient across the wall and then eliminating the heat source. The ensuing transient temperatures were measured by thermocouples and were compared with those predicted by theory. The experimental results varied from the exact solution by 14 percent and from the approximate solution by 18 percent. The experimental results indicated that the tests were consistent. The difference between the theoretical and experimental results was attributed to: (1) contact resistances, (2) nonhomogeneous wall materials, (3) nonuniform surface coefficients of heat transfer, and (k) the effect of neglecting certain heat capacities which actually were not negligible. The results indicated that the transient temperatures varied according to the equation T = Ti e [formula omitted] where T represents temperature, t represents time, and [formula omitted] is the time constant. The results also showed that the method of analysis was acceptable and that the approximate analysis is suitable for walls with small frame areas.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».