Environmental Life-Cycle Analysis of Hybrid Solar Photovoltaic/Thermal Systems for Use in Hong Kong

Table 2

Collector and technical design data of BiPV/T system.

Design parameters	Data
Front glazing (low-iron glass)
Thickness	0.004 m
Surface area	1.61 m^2
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	0.81 m^2
Cell electrical efficiency at STC	13%
Solar cell temperature coefficient	0.005/K
Emissivity	0.8
Absorptivity	0.8
Packing factor (wrt glazing)	50%
Thermal absorber (aluminum alloy)
Thermal capacity	903 kJ/(kg·K)
Density	2702 kg/m^3
Thermal conductivity	237 W/(m·K)
Emissivity	0.8
Absorptivity	0.9
Insulation material (glass wool)
Thickness	0.03 m
Air gap between insulation layer and building wall	0.02 m
Building wall (brick)
Thickness	0.15 m
Density	1600 kg/m^3
Thermal capacity	880 J/(kg·K)
Thermal conductivity	1.0 W/(m·K)
Water tank (steel) and connecting pipes (copper)
Water storage capacity	0.46 m^3
Tank length	1.5 m
Tank diameter	0.54 m
Pipe diameter	0.055 m
Thickness of insulation layer at tank	0.025 m
Thickness of insulation layer on pipe	0.02 m