Experimental and numerical assessment of water-based photovoltaic/thermal collectors with varied tubular absorber cross-sections
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Bibliographic record
Abstract
This study aims to develop 3D numerical models utilizing COMSOL software to analyze the heat transfer (HT) behaviour of water-based photovoltaic/thermal (WPV/T) collectors with circular, and elliptical tubular cross-sections with different dimensions to find an optimized and efficient PV/T design. Indoor experimental tests were conducted to validate the numerical results. The performance of PV/T was evaluated in terms of governing parameters, including the mass flow rate ( m ˙ ), solar irradiance ( I ), heat gain, maximum power ( P max ), Reynolds number ( R e ), thermal ( η t h ) and electrical ( η e l ) efficiency, the temperature difference between the outlet and inlet water ( T o -T i ), the average cell temperature, and total efficiency ( η t o t a l ). It was determined that m ˙ = 0.04 kg/s was the optimal water flow rate for the best performance. The results indicate that the PV/T collector with the elliptical cross-section tube with the least hydraulic diameter achieved the maximum total efficiency, both numerically and experimentally, at 76.9 % and 72.94 %, respectively, under turbulent flow conditions with R e = 5502.92 and I = 1000 W/m 2 . η t o t a l of the elliptical PV/T collectors is approximately 10 % and 6 % higher than that of circular design, respectively at the optimum flow rate, and I = 1000 W/m 2 . It is also found that tubes with lower hydraulic diameter values, while maintaining the same tube cross-section perimeter, exhibit higher HT characteristics compared to those with greater hydraulic diameters. The findings from this innovative and comprehensive study indicate an opportunity to enhance the HT properties of the PV/T system by optimizing the cross-sectional design and hydraulic diameter of the absorber tube, ultimately increasing total efficiency. Additionally, the optimized design opens avenues for future research and can be further developed for both industrial and domestic applications.
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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 it