研究目的
To optimize the efficiency-temperature rise couple of a designed solar air heater by considering appropriate materials for the absorber, glazing, and insulation, and to evaluate the thermal performance based on orientation and climate conditions.
研究成果
The constructed solar air collector achieves efficiencies around 50% for most of the year with an air flow rate of 52 m3/h/m2, delivering useful energy up to 4500 W. Optimal tilt angles between 15° and 30° provide the best performance, with higher efficiencies in summer months. Choosing suitable materials for the absorber, glazing, and insulation improves heat transfer and reduces losses. Future work should focus on enhancing the absorber design with barriers or thermal storage like desert sand to increase convective heat transfer.
研究不足
The study relies on meteorological data from a specific year (2011) and location (Annaba, Algeria), which may not be generalizable. The models used (e.g., for solar radiation estimation) have inherent uncertainties and may not account for all climatic variations. The experimental setup is specific to the constructed collector, and results might differ with other designs or materials.
1：Experimental Design and Method Selection:
The study combines experimental and theoretical approaches to investigate thermal performance. It uses mathematical models (e.g., Liu-Jordan isotropic model) to calculate solar radiation on tilted surfaces and optimize tilt and azimuth angles.
2：Sample Selection and Data Sources:
Meteorological data for Annaba, Algeria (latitude 36°54'N, longitude 7°45'E) from 2011, including temperature, solar radiation, and wind speed, obtained from the national meteorological office.
3：List of Experimental Equipment and Materials:
A solar air collector with a double-glazing cover (
4：5 mm thickness), an aluminum absorber (area 7 m2, thickness 5 mm, coated flat-black), insulation made of Sapelli wood and glass wool, and specified parameters such as emissivity, thermal conductivity, and flow rates. Experimental Procedures and Operational Workflow:
Calculations were performed for azimuth angles γ = 0°,
5：5°, 45°, and 5°, and tilt angles β varied from 15° to 70° in 5-degree increments. Data on solar radiation components (beam, diffuse) were estimated using correlations and models. Data Analysis Methods:
Efficiency and useful energy were calculated using heat balance equations, with statistical analysis of solar radiation data and comparison to literature models.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
