Simulation of Airflow and Heat Transfer in a Habitat with a Gable Roof Subjected To Directional Solar Irradiation
Bibliographic record
Abstract
Natural convection from roofs subjected to directional solar irradiation is numerically studied in a typical habitat.The roof consists of two slopes that do not receive the same amount of solar irradiation at any given time.The slopes would act as a thermal screen for each other, resulting in reduced heating through the roof.To achieve this, a cavity with a straight pentagonal cross-section is subjected to a heat flux model whose intensity on each slope depends on the apparent position of the sun relative to the roof.The numerical approach is based on the finite volume method.The resolution of the unsteady natural convection equations has enabled us to determine the heat transfer and air flow which are highly dependent on the apparent position of the sun and Rayleigh number.The east-west orientation and the apparent movement of the sun cause the right slope to receive solar irradiation first.It acts as a thermal screen for the opposite slope, which remains in the shadow until it reaches its peak solar irradiation.The average Nusselt numbers show that, overall, the heat exchange between the fluid and the slope that first received the solar irradiation remains high.Unlike many previous studies in which the slopes are subjected to the same heat flux profile (constant or variable over time), the flow exhibits no symmetry and is highly unstable, with the formation and disappearance of flow cells.The thermal field and system dynamics indicate that, for optimal ventilation driven by thermal buoyancy forces, it is essential to position the ventilation systems at the center of the slopes walls, especially the one that first receives the first solar radiation.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".