Performance Characterisation of a Hybrid Flat-Plate Vacuum Insulated Photovoltaic/Thermal Solar Power Module in Subtropical Climate

Table 3

Parameters used in the analysis.

Parameter	Value
Emissivity of cover glass	0.9
Emissivity of PV cells	0.9
Thermal conductivity of glass	0.9 W/mK
Width of air gap	50 mm
Width of vacuum cavity	75 mm
Thermal conductivity of air	0.025 W/mK
Thermal conductivity of vacuum	0.004 W/mK
Thermal conductivity of back insulation layer	1 W/m^2K
Thermal conductivity of copper	385 W/m^2K
Heat capacity of water	4.2 kJ/kgK
Water flow rate	10 kg/m^2h
Heat transfer from PV cell to absorber plate	125 W/m^2K
Volume of water storage tank	100 l
Heat loss from the storage tank	1 W/K
Thermal diffusivity of air	2.69 × 10^−5 (m/s^2)
Kinematic viscosity of air	1.88 × 10^−5 (m/s^2)