Research Article
Environmental Life-Cycle Analysis of Hybrid Solar Photovoltaic/Thermal Systems for Use in Hong Kong
Table 1
Collector and technical design data of free-stand PV/T system.
| Design parameters | Data |
| Glazing (low-iron glass) |
| Thickness | 0.004 m | Emissivity | 0.88 | Extinction coefficient | 26/m | Refraction index | 1.526 | Depth of air gap underneath | 0.025 m |
|
PV encapsulation (TPT + EVA + solar cell + EVA + TPT + silicon gel) |
| Solar cell type | single-crystalline silicon | Cell area | 1.11 m2 | Cell electrical efficiency at STC | 13% | Solar cell temperature coefficient | 0.005/K | Emissivity | 0.8 | Absorptivity | 0.8 | Packing factor (wrt glazing) | 63% |
| Thermal absorber (Aluminum) |
| No. of flat-box absorber module | 15 | Absorber module size | 0.105 × 1.38 × 0.012 m | No. of header | 2 | Header size | 1.575 × 0.025 (dia.) × 0.002 (thick) m |
| Thermal insulation layer (glass wool) |
| Thickness | 0.03 m |
| Back cover (galvanized iron) |
| Thickness | 0.001 m |
| Water tank and connecting pipes |
| Water storage capacity | 155 kg | Tank length | 1.2 m | Tank diameter | 0.21 m | Pipe diameter | 0.015 m | Thickness of insulation layer at tank | 0.025 m | Thickness of insulation layer on pipe | 0.02 m |
|
|