研究目的
To present the analyses on the characterisation and the performance of the new type of matrix absorber, cross-matrix absorber (CMA) for solar air collector, and to investigate four types of cross-matrix absorber with different geometry and dimensions.
研究成果
Type I cross-matrix absorber demonstrated the highest thermal efficiency (76%), temperature elevation (15.3 °C), and thermal capacity (38.7 kJ), with a low cost-benefit ratio (0.15 RM/kWh). It induced turbulent flow with minimal pressure drop (up to 1.33 Pa) and showed superior performance compared to other types and conventional absorbers. The design allows for material combinations and compact form, offering cost and efficiency benefits for solar air heating applications.
研究不足
The study is limited to specific absorber geometries and materials; outdoor experiments are subject to environmental variations. The infrared exposure from halogen lamps in the solar simulator may not fully replicate natural solar radiation. The techno-economic analysis assumes fixed operational parameters and may not account for all real-world variables.
1：Experimental Design and Method Selection:
The study involved experimental investigation of four different geometries of cross-matrix absorbers (Type I, II, III, IV) under forced convection conditions. Thermal efficiency, pressure drops, and heat transfer parameters were evaluated using both indoor solar simulator and outdoor solar radiation as heat sources. Theoretical models and correlations (e.g., Nusselt number correlations) were employed for analysis.
2：Sample Selection and Data Sources:
The absorbers were made from aluminium 6063 and stainless steel 304 hollow square tubes with specific dimensions. Air mass flow rates ranged from 0.0142 kg/s to 0.0360 kg/s. Data on temperature, solar irradiance, air velocity, and pressure were collected.
3：0142 kg/s to 0360 kg/s. Data on temperature, solar irradiance, air velocity, and pressure were collected.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Solar simulator with 18 halogen lamps (300 W each), variable depth collector test stand, data acquisition (DAQ) system (Advantech sensor module), pyranometer (Apogee Logan UT SP-110), thermocouples (type-K), anemometer (Lutron LM-8102), polycarbonate cover, insulation materials (Insulfex? closed-cell elastomeric nitrile rubber foam and plywood), and various sensors for temperature and air flow measurements.
4：Experimental Procedures and Operational Workflow:
Experiments were conducted with solar irradiance set at 525 W/m2 indoors and natural outdoor conditions. Air flow rates were controlled using centrifugal fans. Temperature and other parameters were recorded over 40-minute periods (20 min heating, 20 min cooling). Outdoor tests lasted 10 hours.
5：Data Analysis Methods:
Data were analyzed using energy balance equations, efficiency calculations, pressure drop measurements, and heat transfer coefficient determinations. Uncertainty analysis was performed using standard methods.
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