Thermal Evaluation of a Double-Pass Unglazed Solar Air Heater with Perforated Plate and Wire Mesh Layers
| Autor: | Afaq Jasim Mahmood |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermal efficiency
Materials science wire mesh layers 020209 energy Geography Planning and Development Airflow lcsh:TJ807-830 lcsh:Renewable energy sources 02 engineering and technology Management Monitoring Policy and Law Solar irradiance Double pass Thermal 0202 electrical engineering electronic engineering information engineering perforated absorber plate double pass Composite material thermal efficiency lcsh:Environmental sciences lcsh:GE1-350 Solar air heater Renewable Energy Sustainability and the Environment Wire mesh lcsh:Environmental effects of industries and plants solar air heater 021001 nanoscience & nanotechnology lcsh:TD194-195 0210 nano-technology Intensity (heat transfer) |
| Zdroj: | Sustainability, Vol 12, Iss 3619, p 3619 (2020) Sustainability Volume 12 Issue 9 |
| ISSN: | 2071-1050 |
| Popis: | In this study, an experimental outdoor investigation of the thermal efficiency and outlet air temperature was conducted on an unglazed, double-pass, solar air heater with a perforated absorber plate and packing wire mesh layers as a supplemental absorbent area. This was done to observe their effects on the thermal performance of the solar air heater. The double-pass collector was constructed with a bed height of 0.05 m, and a collection area of 1.5 m2. The height of the upper channel was fixed at 0.015 m to improve the thermal efficiency, and the outlet temperature at air flow rates between 0.003 and 0.018 kg/s. The collector was mounted with a slope of 42° facing south, to maximize the intensity of solar irradiance during winter. The effects of the air flow rate, ambient temperature, inlet temperature, outlet temperature, and solar intensity were experimentally investigated. The results showed that thermal efficiency could be improved by increasing the air flow rate, where the highest thermal efficiency achieved was 86% at 0.018 kg/s. However, the temperature difference was increased to a maximum value of 38.6 ° C, when the air flow rate was decreased to 0.003 kg/s. Furthermore, the results demonstrated a significant improvement in the thermal efficiency and outlet temperature and when compared with previous research, the experimental results and the predictions for the outlet temperature using the theoretical model agreed. |
| Databáze: | OpenAIRE |
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